diff --git a/changelog.d/fix-az-ptc-schedule-2-thresholds.fixed.md b/changelog.d/fix-az-ptc-schedule-2-thresholds.fixed.md
new file mode 100644
index 00000000000..98e1d880137
--- /dev/null
+++ b/changelog.d/fix-az-ptc-schedule-2-thresholds.fixed.md
@@ -0,0 +1 @@
+Fix the Arizona property tax credit Schedule 2 thresholds, which were each one dollar low: a claimant living with others with household income of exactly $2,500, $2,650, ..., $5,500 got the next band's amount ($5,500 got none) instead of the ARS 43-1072(B)(2) amount.
diff --git a/policyengine_us/parameters/gov/states/az/tax/income/credits/property_tax/amount/cohabitating.yaml b/policyengine_us/parameters/gov/states/az/tax/income/credits/property_tax/amount/cohabitating.yaml
index 44d30a6a5f6..29dc77cdb9b 100644
--- a/policyengine_us/parameters/gov/states/az/tax/income/credits/property_tax/amount/cohabitating.yaml
+++ b/policyengine_us/parameters/gov/states/az/tax/income/credits/property_tax/amount/cohabitating.yaml
@@ -1,107 +1,119 @@
 description: Arizona provides this property tax credit amount for filers cohabitating with other people, based on income.
 metadata:
   reference:
-    - title: 2024 Property Tax Refund (Credit) Claim Form 140PTC
-      href: https://azdor.gov/forms/tax-credits-forms/property-tax-refund-credit-claim-form-fillable#page=2
-    - title: 2023 Property Tax Refund (Credit) Claim Form 140PTC
-      href: https://azdor.gov/forms/tax-credits-forms/property-tax-refund-credit-claim-form-fillable#page=2
-    - title: 2022 Property Tax Refund (Credit) Claim Form 140PTC
+    - title: 2025 Property Tax Refund (Credit) Claim Form 140PTC, page 2, Schedule 2
+      href: https://azdor.gov/sites/default/files/document/FORMS_INDIVIDUAL_2025_140PTC_f.pdf#page=2
+    - title: 2024 Property Tax Refund (Credit) Claim Form 140PTC, page 2, Schedule 2
+      href: https://azdor.gov/sites/default/files/document/FORMS_INDIVIDUAL_2024_140PTC_f.pdf#page=2
+    - title: 2023 Property Tax Refund (Credit) Claim Form 140PTC, page 2, Schedule 2
+      href: https://azdor.gov/sites/default/files/2023-12/FORMS_INDIVIDUAL_2023_140PTC_f.pdf#page=2
+    - title: 2022 Property Tax Refund (Credit) Claim Form 140PTC, page 2, Schedule 2
       href: https://azdor.gov/sites/default/files/2023-03/FORMS_INDIVIDUAL_2022_140PTC.pdf#page=2
-    - title: 2021 Property Tax Refund (Credit) Claim Form 140PTC
+    - title: 2021 Property Tax Refund (Credit) Claim Form 140PTC, page 2, Schedule 2
       href: https://azdor.gov/sites/default/files/2023-03/FORMS_INDIVIDUAL_2021_140PTC.pdf#page=2
-    - title: 43-1072. Earned credit for property taxes; residents sixty-five years of age or older - (B) (2)
+    - title: 43-1072. Earned credit for property taxes; residents sixty-five years of age or older - (A)(3)(b), (B)(2)
       href: https://www.azleg.gov/viewdocument/?docName=https://www.azleg.gov/ars/43/01072.htm
   threshold_unit: currency-USD
   rate_unit: currency-USD
   type: single_amount
   period: year
-  label: Arizona property tax credit cohabitating amount 
+  label: Arizona property tax credit cohabitating amount
+# Each threshold is the lower bound of a band in ARS 43-1072(B)(2), and a
+# band runs up to, but not including, the next band's lower bound. The
+# statute lists whole-dollar bands ($0-2,500, 2,501-2,650, ...) and sets
+# the income limit in (A)(3)(b) as "less than" $5,501, one dollar above the
+# last band's upper bound, so the last band covers every income below $5,501.
+# Reading every band the same way puts cents between two whole-dollar bands
+# in the lower one: $2,500.50 gets the $0-2,500 amount, as if the cents
+# were dropped. Form 140PTC line 10 takes whole dollars, and the 2025 Form
+# 140 instructions (page 4) round to the nearest dollar, which would instead
+# move 50 cents or more into the next band.
 brackets:
   - threshold:
       2021-01-01: 0
     amount:
       2021-01-01: 502
   - threshold:
-      2021-01-01: 2_500
+      2021-01-01: 2_501
     amount:
       2021-01-01: 479
   - threshold:
-      2021-01-01: 2_650
+      2021-01-01: 2_651
     amount:
       2021-01-01: 457
   - threshold:
-      2021-01-01: 2_800
+      2021-01-01: 2_801
     amount:
       2021-01-01: 435
   - threshold:
-      2021-01-01: 2_950
+      2021-01-01: 2_951
     amount:
       2021-01-01: 412
   - threshold:
-      2021-01-01: 3_100
+      2021-01-01: 3_101
     amount:
       2021-01-01: 390
   - threshold:
-      2021-01-01: 3_250
+      2021-01-01: 3_251
     amount:
       2021-01-01: 368
   - threshold:
-      2021-01-01: 3_400
+      2021-01-01: 3_401
     amount:
       2021-01-01: 345
   - threshold:
-      2021-01-01: 3_550
+      2021-01-01: 3_551
     amount:
       2021-01-01: 323
   - threshold:
-      2021-01-01: 3_700
+      2021-01-01: 3_701
     amount:
       2021-01-01: 301
   - threshold:
-      2021-01-01: 3_850
+      2021-01-01: 3_851
     amount:
       2021-01-01: 279
   - threshold:
-      2021-01-01: 4_000
+      2021-01-01: 4_001
     amount:
       2021-01-01: 256
   - threshold:
-      2021-01-01: 4_150
+      2021-01-01: 4_151
     amount:
       2021-01-01: 234
   - threshold:
-      2021-01-01: 4_300
+      2021-01-01: 4_301
     amount:
       2021-01-01: 212
   - threshold:
-      2021-01-01: 4_450
+      2021-01-01: 4_451
     amount:
       2021-01-01: 189
   - threshold:
-      2021-01-01: 4_600
+      2021-01-01: 4_601
     amount:
       2021-01-01: 167
   - threshold:
-      2021-01-01: 4_750
+      2021-01-01: 4_751
     amount:
       2021-01-01: 145
   - threshold:
-      2021-01-01: 4_900
+      2021-01-01: 4_901
     amount:
       2021-01-01: 123
   - threshold:
-      2021-01-01: 5_050
+      2021-01-01: 5_051
     amount:
       2021-01-01: 100
   - threshold:
-      2021-01-01: 5_200
+      2021-01-01: 5_201
     amount:
       2021-01-01: 78
   - threshold:
-      2021-01-01: 5_350
+      2021-01-01: 5_351
     amount:
       2021-01-01: 56
   - threshold:
-      2021-01-01: 5_500
+      2021-01-01: 5_501
     amount:
       2021-01-01: 0
diff --git a/policyengine_us/parameters/gov/states/az/tax/income/credits/property_tax/amount/living_alone.yaml b/policyengine_us/parameters/gov/states/az/tax/income/credits/property_tax/amount/living_alone.yaml
index 0020ff70632..4147a0a11ac 100644
--- a/policyengine_us/parameters/gov/states/az/tax/income/credits/property_tax/amount/living_alone.yaml
+++ b/policyengine_us/parameters/gov/states/az/tax/income/credits/property_tax/amount/living_alone.yaml
@@ -1,21 +1,33 @@
 description: Arizona provides this property tax credit amount for filers living alone, based on income.
 metadata:
   reference:
-    - title: 2024 Property Tax Refund (Credit) Claim Form 140PTC
-      href: https://azdor.gov/forms/tax-credits-forms/property-tax-refund-credit-claim-form-fillable#page=2
-    - title: 2023 Property Tax Refund (Credit) Claim Form 140PTC
-      href: https://azdor.gov/forms/tax-credits-forms/property-tax-refund-credit-claim-form-fillable#page=2
-    - title: 2022 Property Tax Refund (Credit) Claim Form 140PTC
+    - title: 2025 Property Tax Refund (Credit) Claim Form 140PTC, page 2, Schedule 1
+      href: https://azdor.gov/sites/default/files/document/FORMS_INDIVIDUAL_2025_140PTC_f.pdf#page=2
+    - title: 2024 Property Tax Refund (Credit) Claim Form 140PTC, page 2, Schedule 1
+      href: https://azdor.gov/sites/default/files/document/FORMS_INDIVIDUAL_2024_140PTC_f.pdf#page=2
+    - title: 2023 Property Tax Refund (Credit) Claim Form 140PTC, page 2, Schedule 1
+      href: https://azdor.gov/sites/default/files/2023-12/FORMS_INDIVIDUAL_2023_140PTC_f.pdf#page=2
+    - title: 2022 Property Tax Refund (Credit) Claim Form 140PTC, page 2, Schedule 1
+      href: https://azdor.gov/sites/default/files/2023-03/FORMS_INDIVIDUAL_2022_140PTC.pdf#page=2
+    - title: 2021 Property Tax Refund (Credit) Claim Form 140PTC, page 2, Schedule 1
       href: https://azdor.gov/sites/default/files/2023-03/FORMS_INDIVIDUAL_2021_140PTC.pdf#page=2
-    - title: 2021 Property Tax Refund (Credit) Claim Form 140PTC
-      href: https://azdor.gov/sites/default/files/2023-03/FORMS_INDIVIDUAL_2021_140PTC.pdf#page=2
-    - title: 43-1072. Earned credit for property taxes; residents sixty-five years of age or older - (B) (1)
+    - title: 43-1072. Earned credit for property taxes; residents sixty-five years of age or older - (A)(3)(a), (B)(1)
       href: https://www.azleg.gov/viewdocument/?docName=https://www.azleg.gov/ars/43/01072.htm
   threshold_unit: currency-USD
   rate_unit: currency-USD
   type: single_amount
   period: year
-  label: Arizona property tax credit living alone amount 
+  label: Arizona property tax credit living alone amount
+# Each threshold is the lower bound of a band in ARS 43-1072(B)(1), and a
+# band runs up to, but not including, the next band's lower bound. The
+# statute lists whole-dollar bands ($0-1,750, 1,751-1,850, ...) and sets
+# the income limit in (A)(3)(a) as "less than" $3,751, one dollar above the
+# last band's upper bound, so the last band covers every income below $3,751.
+# Reading every band the same way puts cents between two whole-dollar bands
+# in the lower one: $1,750.50 gets the $0-1,750 amount, as if the cents
+# were dropped. Form 140PTC line 10 takes whole dollars, and the 2025 Form
+# 140 instructions (page 4) round to the nearest dollar, which would instead
+# move 50 cents or more into the next band.
 brackets:
   - threshold:
       2021-01-01: 0
diff --git a/policyengine_us/tests/policy/baseline/gov/states/az/tax/income/credits/az_property_tax_credit.yaml b/policyengine_us/tests/policy/baseline/gov/states/az/tax/income/credits/az_property_tax_credit.yaml
index 2f4afe51114..aa50bb2e5e7 100644
--- a/policyengine_us/tests/policy/baseline/gov/states/az/tax/income/credits/az_property_tax_credit.yaml
+++ b/policyengine_us/tests/policy/baseline/gov/states/az/tax/income/credits/az_property_tax_credit.yaml
@@ -89,7 +89,10 @@
     real_estate_taxes: 100
     rent: 1_500
   output:
-    az_property_tax_credit: 0
+    # ARS 43-1072(B)(2): $5,500 is in the $5,351-5,500 band ($56), below the
+    # (A)(3)(b) limit of "less than" $5,501. Taxes paid: 100 + 0.15 * 1,500 =
+    # 325, so the credit is the $56 table amount.
+    az_property_tax_credit: 56
 
 - name: tax unit head does not meet the criteria
   period: 2023
diff --git a/policyengine_us/tests/policy/baseline/gov/states/az/tax/income/credits/az_property_tax_credit_schedules.yaml b/policyengine_us/tests/policy/baseline/gov/states/az/tax/income/credits/az_property_tax_credit_schedules.yaml
new file mode 100644
index 00000000000..bfa052616af
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/az/tax/income/credits/az_property_tax_credit_schedules.yaml
@@ -0,0 +1,1722 @@
+# ARS 43-1072(B) Schedules 1 and 2 (Form 140PTC page 2, identical in
+# 2021-2025): every band edge on both sides, the (A)(3) income limits
+# ("less than" $3,751 living alone and $5,501 living with others), and
+# cents between whole-dollar bands, which stay in the lower band (see the
+# note in each schedule's parameter file). Property taxes paid ($1,000) exceed
+# every table amount, so the credit equals the table amount.
+
+# Schedule 1: ARS 43-1072(B)(1), living alone.
+
+- name: Schedule 1 (living alone), income of $0 gets $502
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 0
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 502
+
+- name: Schedule 1 (living alone), income of $1,750 is the upper edge of the $0-1,750 band ($502)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 1_750
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 502
+
+- name: Schedule 1 (living alone), income of $1,750.50 is between bands and stays in $0-1,750 ($502)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 1_750.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 502
+
+- name: Schedule 1 (living alone), income of $1,751 is the lower edge of the $1,751-1,850 band ($479)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 1_751
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 479
+
+- name: Schedule 1 (living alone), income of $1,850 is the upper edge of the $1,751-1,850 band ($479)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 1_850
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 479
+
+- name: Schedule 1 (living alone), income of $1,850.50 is between bands and stays in $1,751-1,850 ($479)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 1_850.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 479
+
+- name: Schedule 1 (living alone), income of $1,851 is the lower edge of the $1,851-1,950 band ($457)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 1_851
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 457
+
+- name: Schedule 1 (living alone), income of $1,950 is the upper edge of the $1,851-1,950 band ($457)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 1_950
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 457
+
+- name: Schedule 1 (living alone), income of $1,950.50 is between bands and stays in $1,851-1,950 ($457)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 1_950.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 457
+
+- name: Schedule 1 (living alone), income of $1,951 is the lower edge of the $1,951-2,050 band ($435)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 1_951
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 435
+
+- name: Schedule 1 (living alone), income of $2,050 is the upper edge of the $1,951-2,050 band ($435)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_050
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 435
+
+- name: Schedule 1 (living alone), income of $2,050.50 is between bands and stays in $1,951-2,050 ($435)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_050.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 435
+
+- name: Schedule 1 (living alone), income of $2,051 is the lower edge of the $2,051-2,150 band ($412)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_051
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 412
+
+- name: Schedule 1 (living alone), income of $2,150 is the upper edge of the $2,051-2,150 band ($412)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_150
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 412
+
+- name: Schedule 1 (living alone), income of $2,150.50 is between bands and stays in $2,051-2,150 ($412)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_150.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 412
+
+- name: Schedule 1 (living alone), income of $2,151 is the lower edge of the $2,151-2,250 band ($390)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_151
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 390
+
+- name: Schedule 1 (living alone), income of $2,250 is the upper edge of the $2,151-2,250 band ($390)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_250
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 390
+
+- name: Schedule 1 (living alone), income of $2,250.50 is between bands and stays in $2,151-2,250 ($390)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_250.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 390
+
+- name: Schedule 1 (living alone), income of $2,251 is the lower edge of the $2,251-2,350 band ($368)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_251
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 368
+
+- name: Schedule 1 (living alone), income of $2,350 is the upper edge of the $2,251-2,350 band ($368)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_350
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 368
+
+- name: Schedule 1 (living alone), income of $2,350.50 is between bands and stays in $2,251-2,350 ($368)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_350.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 368
+
+- name: Schedule 1 (living alone), income of $2,351 is the lower edge of the $2,351-2,450 band ($345)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_351
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 345
+
+- name: Schedule 1 (living alone), income of $2,450 is the upper edge of the $2,351-2,450 band ($345)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_450
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 345
+
+- name: Schedule 1 (living alone), income of $2,450.50 is between bands and stays in $2,351-2,450 ($345)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_450.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 345
+
+- name: Schedule 1 (living alone), income of $2,451 is the lower edge of the $2,451-2,550 band ($323)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_451
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 323
+
+- name: Schedule 1 (living alone), income of $2,550 is the upper edge of the $2,451-2,550 band ($323)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_550
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 323
+
+- name: Schedule 1 (living alone), income of $2,550.50 is between bands and stays in $2,451-2,550 ($323)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_550.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 323
+
+- name: Schedule 1 (living alone), income of $2,551 is the lower edge of the $2,551-2,650 band ($301)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_551
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 301
+
+- name: Schedule 1 (living alone), income of $2,650 is the upper edge of the $2,551-2,650 band ($301)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_650
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 301
+
+- name: Schedule 1 (living alone), income of $2,650.50 is between bands and stays in $2,551-2,650 ($301)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_650.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 301
+
+- name: Schedule 1 (living alone), income of $2,651 is the lower edge of the $2,651-2,750 band ($279)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_651
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 279
+
+- name: Schedule 1 (living alone), income of $2,750 is the upper edge of the $2,651-2,750 band ($279)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_750
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 279
+
+- name: Schedule 1 (living alone), income of $2,750.50 is between bands and stays in $2,651-2,750 ($279)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_750.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 279
+
+- name: Schedule 1 (living alone), income of $2,751 is the lower edge of the $2,751-2,850 band ($256)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_751
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 256
+
+- name: Schedule 1 (living alone), income of $2,850 is the upper edge of the $2,751-2,850 band ($256)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_850
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 256
+
+- name: Schedule 1 (living alone), income of $2,850.50 is between bands and stays in $2,751-2,850 ($256)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_850.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 256
+
+- name: Schedule 1 (living alone), income of $2,851 is the lower edge of the $2,851-2,950 band ($234)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_851
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 234
+
+- name: Schedule 1 (living alone), income of $2,950 is the upper edge of the $2,851-2,950 band ($234)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_950
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 234
+
+- name: Schedule 1 (living alone), income of $2,950.50 is between bands and stays in $2,851-2,950 ($234)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_950.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 234
+
+- name: Schedule 1 (living alone), income of $2,951 is the lower edge of the $2,951-3,050 band ($212)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_951
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 212
+
+- name: Schedule 1 (living alone), income of $3,050 is the upper edge of the $2,951-3,050 band ($212)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_050
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 212
+
+- name: Schedule 1 (living alone), income of $3,050.50 is between bands and stays in $2,951-3,050 ($212)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_050.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 212
+
+- name: Schedule 1 (living alone), income of $3,051 is the lower edge of the $3,051-3,150 band ($189)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_051
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 189
+
+- name: Schedule 1 (living alone), income of $3,150 is the upper edge of the $3,051-3,150 band ($189)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_150
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 189
+
+- name: Schedule 1 (living alone), income of $3,150.50 is between bands and stays in $3,051-3,150 ($189)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_150.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 189
+
+- name: Schedule 1 (living alone), income of $3,151 is the lower edge of the $3,151-3,250 band ($167)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_151
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 167
+
+- name: Schedule 1 (living alone), income of $3,250 is the upper edge of the $3,151-3,250 band ($167)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_250
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 167
+
+- name: Schedule 1 (living alone), income of $3,250.50 is between bands and stays in $3,151-3,250 ($167)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_250.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 167
+
+- name: Schedule 1 (living alone), income of $3,251 is the lower edge of the $3,251-3,350 band ($145)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_251
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 145
+
+- name: Schedule 1 (living alone), income of $3,350 is the upper edge of the $3,251-3,350 band ($145)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_350
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 145
+
+- name: Schedule 1 (living alone), income of $3,350.50 is between bands and stays in $3,251-3,350 ($145)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_350.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 145
+
+- name: Schedule 1 (living alone), income of $3,351 is the lower edge of the $3,351-3,450 band ($123)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_351
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 123
+
+- name: Schedule 1 (living alone), income of $3,450 is the upper edge of the $3,351-3,450 band ($123)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_450
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 123
+
+- name: Schedule 1 (living alone), income of $3,450.50 is between bands and stays in $3,351-3,450 ($123)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_450.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 123
+
+- name: Schedule 1 (living alone), income of $3,451 is the lower edge of the $3,451-3,550 band ($100)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_451
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 100
+
+- name: Schedule 1 (living alone), income of $3,550 is the upper edge of the $3,451-3,550 band ($100)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_550
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 100
+
+- name: Schedule 1 (living alone), income of $3,550.50 is between bands and stays in $3,451-3,550 ($100)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_550.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 100
+
+- name: Schedule 1 (living alone), income of $3,551 is the lower edge of the $3,551-3,650 band ($78)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_551
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 78
+
+- name: Schedule 1 (living alone), income of $3,650 is the upper edge of the $3,551-3,650 band ($78)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_650
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 78
+
+- name: Schedule 1 (living alone), income of $3,650.50 is between bands and stays in $3,551-3,650 ($78)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_650.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 78
+
+- name: Schedule 1 (living alone), income of $3,651 is the lower edge of the $3,651-3,750 band ($56)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_651
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 56
+
+- name: Schedule 1 (living alone), income of $3,750 is the upper edge of the $3,651-3,750 band ($56)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_750
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 56
+
+- name: Schedule 1 (living alone), income of $3,750.50 is between bands and stays in $3,651-3,750 ($56)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_750.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 56
+
+- name: Schedule 1 (living alone), income of $3,750.99 is below the "less than $3,751" limit of (A)(3)(a) ($56)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_750.99
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 56
+
+- name: Schedule 1 (living alone), income of $3,751 is not "less than $3,751" under (A)(3)(a) ($0)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_751
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 0
+
+- name: Schedule 1 (living alone), income of $1,750 is the upper edge of the $0-1,750 band in 2021 ($502)
+  period: 2021
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 1_750
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 502
+
+- name: Schedule 1 (living alone), income of $3,750 is the upper edge of the $3,651-3,750 band in 2021 ($56)
+  period: 2021
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_750
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 56
+
+- name: Schedule 1 (living alone), income of $3,751 is at the limit in 2021 ($0)
+  period: 2021
+  input:
+    state_code: AZ
+    cohabitating_spouses: false
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_751
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 0
+
+# Schedule 2: ARS 43-1072(B)(2), living with others.
+
+- name: Schedule 2 (living with others), income of $0 gets $502
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 0
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 502
+
+- name: Schedule 2 (living with others), income of $2,500 is the upper edge of the $0-2,500 band ($502)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_500
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 502
+
+- name: Schedule 2 (living with others), income of $2,500.50 is between bands and stays in $0-2,500 ($502)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_500.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 502
+
+- name: Schedule 2 (living with others), income of $2,501 is the lower edge of the $2,501-2,650 band ($479)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_501
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 479
+
+- name: Schedule 2 (living with others), income of $2,650 is the upper edge of the $2,501-2,650 band ($479)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_650
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 479
+
+- name: Schedule 2 (living with others), income of $2,650.50 is between bands and stays in $2,501-2,650 ($479)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_650.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 479
+
+- name: Schedule 2 (living with others), income of $2,651 is the lower edge of the $2,651-2,800 band ($457)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_651
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 457
+
+- name: Schedule 2 (living with others), income of $2,800 is the upper edge of the $2,651-2,800 band ($457)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_800
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 457
+
+- name: Schedule 2 (living with others), income of $2,800.50 is between bands and stays in $2,651-2,800 ($457)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_800.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 457
+
+- name: Schedule 2 (living with others), income of $2,801 is the lower edge of the $2,801-2,950 band ($435)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_801
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 435
+
+- name: Schedule 2 (living with others), income of $2,950 is the upper edge of the $2,801-2,950 band ($435)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_950
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 435
+
+- name: Schedule 2 (living with others), income of $2,950.50 is between bands and stays in $2,801-2,950 ($435)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_950.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 435
+
+- name: Schedule 2 (living with others), income of $2,951 is the lower edge of the $2,951-3,100 band ($412)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_951
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 412
+
+- name: Schedule 2 (living with others), income of $3,100 is the upper edge of the $2,951-3,100 band ($412)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_100
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 412
+
+- name: Schedule 2 (living with others), income of $3,100.50 is between bands and stays in $2,951-3,100 ($412)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_100.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 412
+
+- name: Schedule 2 (living with others), income of $3,101 is the lower edge of the $3,101-3,250 band ($390)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_101
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 390
+
+- name: Schedule 2 (living with others), income of $3,250 is the upper edge of the $3,101-3,250 band ($390)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_250
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 390
+
+- name: Schedule 2 (living with others), income of $3,250.50 is between bands and stays in $3,101-3,250 ($390)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_250.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 390
+
+- name: Schedule 2 (living with others), income of $3,251 is the lower edge of the $3,251-3,400 band ($368)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_251
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 368
+
+- name: Schedule 2 (living with others), income of $3,400 is the upper edge of the $3,251-3,400 band ($368)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_400
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 368
+
+- name: Schedule 2 (living with others), income of $3,400.50 is between bands and stays in $3,251-3,400 ($368)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_400.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 368
+
+- name: Schedule 2 (living with others), income of $3,401 is the lower edge of the $3,401-3,550 band ($345)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_401
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 345
+
+- name: Schedule 2 (living with others), income of $3,550 is the upper edge of the $3,401-3,550 band ($345)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_550
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 345
+
+- name: Schedule 2 (living with others), income of $3,550.50 is between bands and stays in $3,401-3,550 ($345)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_550.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 345
+
+- name: Schedule 2 (living with others), income of $3,551 is the lower edge of the $3,551-3,700 band ($323)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_551
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 323
+
+- name: Schedule 2 (living with others), income of $3,700 is the upper edge of the $3,551-3,700 band ($323)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_700
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 323
+
+- name: Schedule 2 (living with others), income of $3,700.50 is between bands and stays in $3,551-3,700 ($323)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_700.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 323
+
+- name: Schedule 2 (living with others), income of $3,701 is the lower edge of the $3,701-3,850 band ($301)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_701
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 301
+
+- name: Schedule 2 (living with others), income of $3,850 is the upper edge of the $3,701-3,850 band ($301)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_850
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 301
+
+- name: Schedule 2 (living with others), income of $3,850.50 is between bands and stays in $3,701-3,850 ($301)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_850.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 301
+
+- name: Schedule 2 (living with others), income of $3,851 is the lower edge of the $3,851-4,000 band ($279)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 3_851
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 279
+
+- name: Schedule 2 (living with others), income of $4,000 is the upper edge of the $3,851-4,000 band ($279)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_000
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 279
+
+- name: Schedule 2 (living with others), income of $4,000.50 is between bands and stays in $3,851-4,000 ($279)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_000.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 279
+
+- name: Schedule 2 (living with others), income of $4,001 is the lower edge of the $4,001-4,150 band ($256)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_001
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 256
+
+- name: Schedule 2 (living with others), income of $4,150 is the upper edge of the $4,001-4,150 band ($256)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_150
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 256
+
+- name: Schedule 2 (living with others), income of $4,150.50 is between bands and stays in $4,001-4,150 ($256)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_150.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 256
+
+- name: Schedule 2 (living with others), income of $4,151 is the lower edge of the $4,151-4,300 band ($234)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_151
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 234
+
+- name: Schedule 2 (living with others), income of $4,300 is the upper edge of the $4,151-4,300 band ($234)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_300
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 234
+
+- name: Schedule 2 (living with others), income of $4,300.50 is between bands and stays in $4,151-4,300 ($234)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_300.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 234
+
+- name: Schedule 2 (living with others), income of $4,301 is the lower edge of the $4,301-4,450 band ($212)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_301
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 212
+
+- name: Schedule 2 (living with others), income of $4,450 is the upper edge of the $4,301-4,450 band ($212)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_450
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 212
+
+- name: Schedule 2 (living with others), income of $4,450.50 is between bands and stays in $4,301-4,450 ($212)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_450.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 212
+
+- name: Schedule 2 (living with others), income of $4,451 is the lower edge of the $4,451-4,600 band ($189)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_451
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 189
+
+- name: Schedule 2 (living with others), income of $4,600 is the upper edge of the $4,451-4,600 band ($189)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_600
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 189
+
+- name: Schedule 2 (living with others), income of $4,600.50 is between bands and stays in $4,451-4,600 ($189)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_600.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 189
+
+- name: Schedule 2 (living with others), income of $4,601 is the lower edge of the $4,601-4,750 band ($167)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_601
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 167
+
+- name: Schedule 2 (living with others), income of $4,750 is the upper edge of the $4,601-4,750 band ($167)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_750
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 167
+
+- name: Schedule 2 (living with others), income of $4,750.50 is between bands and stays in $4,601-4,750 ($167)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_750.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 167
+
+- name: Schedule 2 (living with others), income of $4,751 is the lower edge of the $4,751-4,900 band ($145)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_751
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 145
+
+- name: Schedule 2 (living with others), income of $4,900 is the upper edge of the $4,751-4,900 band ($145)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_900
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 145
+
+- name: Schedule 2 (living with others), income of $4,900.50 is between bands and stays in $4,751-4,900 ($145)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_900.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 145
+
+- name: Schedule 2 (living with others), income of $4,901 is the lower edge of the $4,901-5,050 band ($123)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 4_901
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 123
+
+- name: Schedule 2 (living with others), income of $5,050 is the upper edge of the $4,901-5,050 band ($123)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_050
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 123
+
+- name: Schedule 2 (living with others), income of $5,050.50 is between bands and stays in $4,901-5,050 ($123)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_050.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 123
+
+- name: Schedule 2 (living with others), income of $5,051 is the lower edge of the $5,051-5,200 band ($100)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_051
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 100
+
+- name: Schedule 2 (living with others), income of $5,200 is the upper edge of the $5,051-5,200 band ($100)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_200
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 100
+
+- name: Schedule 2 (living with others), income of $5,200.50 is between bands and stays in $5,051-5,200 ($100)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_200.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 100
+
+- name: Schedule 2 (living with others), income of $5,201 is the lower edge of the $5,201-5,350 band ($78)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_201
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 78
+
+- name: Schedule 2 (living with others), income of $5,350 is the upper edge of the $5,201-5,350 band ($78)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_350
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 78
+
+- name: Schedule 2 (living with others), income of $5,350.50 is between bands and stays in $5,201-5,350 ($78)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_350.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 78
+
+- name: Schedule 2 (living with others), income of $5,351 is the lower edge of the $5,351-5,500 band ($56)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_351
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 56
+
+- name: Schedule 2 (living with others), income of $5,500 is the upper edge of the $5,351-5,500 band ($56)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_500
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 56
+
+- name: Schedule 2 (living with others), income of $5,500.50 is between bands and stays in $5,351-5,500 ($56)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_500.50
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 56
+
+- name: Schedule 2 (living with others), income of $5,500.99 is below the "less than $5,501" limit of (A)(3)(b) ($56)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_500.99
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 56
+
+- name: Schedule 2 (living with others), income of $5,501 is not "less than $5,501" under (A)(3)(b) ($0)
+  period: 2025
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_501
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 0
+
+- name: Schedule 2 (living with others), income of $2,500 is the upper edge of the $0-2,500 band in 2021 ($502)
+  period: 2021
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 2_500
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 502
+
+- name: Schedule 2 (living with others), income of $5,500 is the upper edge of the $5,351-5,500 band in 2021 ($56)
+  period: 2021
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_500
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 56
+
+- name: Schedule 2 (living with others), income of $5,501 is at the limit in 2021 ($0)
+  period: 2021
+  input:
+    state_code: AZ
+    cohabitating_spouses: true
+    az_property_tax_credit_eligible: true
+    az_property_tax_credit_income: 5_501
+    real_estate_taxes: 1_000
+    rent: 0
+  output:
+    az_property_tax_credit: 0
+
+# Household path: household income computed from its components and the
+# schedule chosen from the household, not given as inputs.
+
+- name: Married couple with $2,500 of income gets the Schedule 2 $0-2,500 amount
+  period: 2025
+  input:
+    people:
+      head: {age: 70, taxable_interest_income: 2_500, real_estate_taxes: 1_000}
+      spouse: {age: 70}
+    tax_units: {tax_unit: {members: [head, spouse]}}
+    households: {household: {members: [head, spouse], state_code: AZ}}
+  output:
+    az_property_tax_credit_income: 2_500
+    az_property_tax_credit: 502
+
+- name: Married couple with $2,501 of income gets the Schedule 2 $2,501-2,650 amount
+  period: 2025
+  input:
+    people:
+      head: {age: 70, taxable_interest_income: 2_501, real_estate_taxes: 1_000}
+      spouse: {age: 70}
+    tax_units: {tax_unit: {members: [head, spouse]}}
+    households: {household: {members: [head, spouse], state_code: AZ}}
+  output:
+    az_property_tax_credit_income: 2_501
+    az_property_tax_credit: 479
+
+# ARS 43-1072(A)(3)(b): a single claimant living with an adult child uses
+# Schedule 2, and $5,500 is less than $5,501.
+- name: Single claimant living with an adult child at $5,500 gets the Schedule 2 $56
+  period: 2025
+  input:
+    people:
+      head: {age: 70, taxable_interest_income: 5_500, real_estate_taxes: 1_000}
+      child: {age: 40, is_tax_unit_dependent: false}
+    tax_units:
+      claimant: {members: [head]}
+      child_unit: {members: [child]}
+    households: {household: {members: [head, child], state_code: AZ}}
+  output:
+    az_property_tax_credit_income: [5_500, 0]
+    az_property_tax_credit: [56, 0]
+
+- name: Single claimant living with an adult child at $5,501 gets no credit
+  period: 2025
+  input:
+    people:
+      head: {age: 70, taxable_interest_income: 5_501, real_estate_taxes: 1_000}
+      child: {age: 40, is_tax_unit_dependent: false}
+    tax_units:
+      claimant: {members: [head]}
+      child_unit: {members: [child]}
+    households: {household: {members: [head, child], state_code: AZ}}
+  output:
+    az_property_tax_credit_income: [5_501, 0]
+    az_property_tax_credit: [0, 0]
+
+# ARS 43-1072(A)(3)(a): living alone, $3,750 is less than $3,751.
+- name: Single claimant living alone at $3,750 gets the Schedule 1 $56
+  period: 2025
+  input:
+    people:
+      head: {age: 70, taxable_interest_income: 3_750, real_estate_taxes: 1_000}
+    tax_units: {tax_unit: {members: [head]}}
+    households: {household: {members: [head], state_code: AZ}}
+  output:
+    az_property_tax_credit_income: 3_750
+    az_property_tax_credit: 56
+
+- name: Single claimant living alone at $3,751 gets no credit
+  period: 2025
+  input:
+    people:
+      head: {age: 70, taxable_interest_income: 3_751, real_estate_taxes: 1_000}
+    tax_units: {tax_unit: {members: [head]}}
+    households: {household: {members: [head], state_code: AZ}}
+  output:
+    az_property_tax_credit_income: 3_751
+    az_property_tax_credit: 0
diff --git a/policyengine_us/tests/test_az_property_tax_credit_schedules.py b/policyengine_us/tests/test_az_property_tax_credit_schedules.py
new file mode 100644
index 00000000000..bab9cfed6cd
--- /dev/null
+++ b/policyengine_us/tests/test_az_property_tax_credit_schedules.py
@@ -0,0 +1,237 @@
+"""Arizona property tax credit Schedules 1 and 2: differential and invariant tests.
+
+ARS 43-1072(B) gives the credit as a table of whole-dollar household income
+bands: (B)(1) for a claimant who did not live with anyone ($0-1,750 -> $502,
+1,751-1,850 -> $479, ..., 3,651-3,750 -> $56) and (B)(2) for one who lived with
+a spouse or other persons ($0-2,500 -> $502, 2,501-2,650 -> $479, ...,
+5,351-5,500 -> $56). (A)(3) limits the credit to income "less than" $3,751
+and $5,501. Form 140PTC page 2 prints the same tables in 2021-2025. The
+parameter files store each band's lower bound as a single_amount threshold, so
+a band runs up to, but not including, the next band's lower bound, and cents
+between two whole-dollar bands stay in the lower band.
+
+Schedule 2's thresholds were once each one dollar low (2,500, 2,650, ...,
+5,500), so incomes of exactly 2,500, 2,650, ..., 5,500 got the next band's
+amount and 5,500 got nothing.
+
+Differential tests compare every whole-dollar income from $0 to $7,000, and
+cents near every band edge, against an independent transcription of the
+statute's tables, in every year from 2021 to 2026:
+
+- through the parameter scales, and
+- through az_property_tax_credit in one vectorised simulation per schedule.
+
+Invariants:
+- Transcription: each table's bands are contiguous whole-dollar ranges from
+  $0, and the last band's upper bound is one dollar below the (A)(3) limit.
+- The amount never rises as income rises.
+- The amount is between $56 and $502 below the (A)(3) limit and $0 at or
+  above it.
+- An income with cents gets the same amount as its whole dollars.
+"""
+
+import numpy as np
+import pytest
+
+from policyengine_us import Simulation
+from policyengine_us.system import system
+
+YEARS = range(2021, 2027)
+
+# ARS 43-1072(B)(1): (lower bound, upper bound, tax credit); (A)(3)(a) limit.
+SCHEDULE_1 = [
+    (0, 1_750, 502),
+    (1_751, 1_850, 479),
+    (1_851, 1_950, 457),
+    (1_951, 2_050, 435),
+    (2_051, 2_150, 412),
+    (2_151, 2_250, 390),
+    (2_251, 2_350, 368),
+    (2_351, 2_450, 345),
+    (2_451, 2_550, 323),
+    (2_551, 2_650, 301),
+    (2_651, 2_750, 279),
+    (2_751, 2_850, 256),
+    (2_851, 2_950, 234),
+    (2_951, 3_050, 212),
+    (3_051, 3_150, 189),
+    (3_151, 3_250, 167),
+    (3_251, 3_350, 145),
+    (3_351, 3_450, 123),
+    (3_451, 3_550, 100),
+    (3_551, 3_650, 78),
+    (3_651, 3_750, 56),
+]
+SCHEDULE_1_LIMIT = 3_751
+
+# ARS 43-1072(B)(2): (lower bound, upper bound, tax credit); (A)(3)(b) limit.
+SCHEDULE_2 = [
+    (0, 2_500, 502),
+    (2_501, 2_650, 479),
+    (2_651, 2_800, 457),
+    (2_801, 2_950, 435),
+    (2_951, 3_100, 412),
+    (3_101, 3_250, 390),
+    (3_251, 3_400, 368),
+    (3_401, 3_550, 345),
+    (3_551, 3_700, 323),
+    (3_701, 3_850, 301),
+    (3_851, 4_000, 279),
+    (4_001, 4_150, 256),
+    (4_151, 4_300, 234),
+    (4_301, 4_450, 212),
+    (4_451, 4_600, 189),
+    (4_601, 4_750, 167),
+    (4_751, 4_900, 145),
+    (4_901, 5_050, 123),
+    (5_051, 5_200, 100),
+    (5_201, 5_350, 78),
+    (5_351, 5_500, 56),
+]
+SCHEDULE_2_LIMIT = 5_501
+
+SCHEDULES = {
+    "living_alone": (SCHEDULE_1, SCHEDULE_1_LIMIT),
+    "cohabitating": (SCHEDULE_2, SCHEDULE_2_LIMIT),
+}
+
+WHOLE_DOLLARS = np.arange(0, 7_001, dtype=float)
+CENTS = np.array([0.01, 0.25, 0.49, 0.5, 0.51, 0.75, 0.99])
+
+
+def statute_amount(table, limit, income):
+    """The table amount for each income: the band holding its whole dollars."""
+    dollars = np.floor(income)
+    amount = np.zeros_like(income)
+    for lower, upper, credit in table:
+        amount = np.where((dollars >= lower) & (dollars <= upper), credit, amount)
+    return np.where(income < limit, amount, 0)
+
+
+def scale(name, year):
+    return getattr(
+        system.parameters(
+            f"{year}-01-01"
+        ).gov.states.az.tax.income.credits.property_tax.amount,
+        name,
+    )
+
+
+def edge_incomes(table, limit):
+    """Cents on each side of every band edge and of the (A)(3) limit."""
+    edges = [lower for lower, _, _ in table[1:]] + [limit]
+    return np.array(
+        sorted(
+            {round(e - 1 + c, 2) for e in edges for c in CENTS}
+            | {round(e + c, 2) for e in edges for c in CENTS}
+        )
+    )
+
+
+@pytest.mark.parametrize("name", SCHEDULES)
+def test_transcription_is_contiguous_and_ends_below_the_limit(name):
+    table, limit = SCHEDULES[name]
+    assert table[0][0] == 0
+    for (_, upper, _), (next_lower, _, _) in zip(table, table[1:]):
+        assert next_lower == upper + 1
+    assert table[-1][1] + 1 == limit
+
+
+def test_both_schedules_pay_the_same_amounts():
+    assert [a for *_, a in SCHEDULE_1] == [a for *_, a in SCHEDULE_2]
+
+
+@pytest.mark.parametrize("year", YEARS)
+@pytest.mark.parametrize("name", SCHEDULES)
+def test_scale_matches_statute_at_every_whole_dollar(name, year):
+    table, limit = SCHEDULES[name]
+    got = scale(name, year).calc(WHOLE_DOLLARS)
+    expected = statute_amount(table, limit, WHOLE_DOLLARS)
+    wrong = WHOLE_DOLLARS[got != expected]
+    assert wrong.size == 0, f"{name} {year}: wrong at {wrong[:10]}"
+
+
+@pytest.mark.parametrize("year", YEARS)
+@pytest.mark.parametrize("name", SCHEDULES)
+def test_scale_matches_statute_at_cents_around_every_edge(name, year):
+    table, limit = SCHEDULES[name]
+    income = edge_incomes(table, limit)
+    got = scale(name, year).calc(income)
+    expected = statute_amount(table, limit, income)
+    wrong = income[got != expected]
+    assert wrong.size == 0, f"{name} {year}: wrong at {wrong[:10]}"
+
+
+@pytest.mark.parametrize("year", YEARS)
+@pytest.mark.parametrize("name", SCHEDULES)
+def test_cents_get_the_amount_of_their_whole_dollars(name, year):
+    s = scale(name, year)
+    whole = s.calc(WHOLE_DOLLARS)
+    for c in CENTS:
+        assert (s.calc(WHOLE_DOLLARS + c) == whole).all(), (name, year, c)
+
+
+@pytest.mark.parametrize("year", YEARS)
+@pytest.mark.parametrize("name", SCHEDULES)
+def test_amount_never_rises_with_income(name, year):
+    income = np.arange(0, 7_000, 0.25)
+    amount = scale(name, year).calc(income)
+    assert (np.diff(amount) <= 0).all()
+
+
+@pytest.mark.parametrize("year", YEARS)
+@pytest.mark.parametrize("name", SCHEDULES)
+def test_amount_is_positive_below_the_limit_and_zero_from_it(name, year):
+    _, limit = SCHEDULES[name]
+    income = np.arange(0, 7_000, 0.25)
+    amount = scale(name, year).calc(income)
+    below = income < limit
+    assert ((amount[below] >= 56) & (amount[below] <= 502)).all()
+    assert (amount[~below] == 0).all()
+
+
+def _credit_by_income(cohabitating, incomes, year):
+    """az_property_tax_credit for one eligible tax unit per income, vectorised."""
+    n = len(incomes)
+    situation = {
+        "people": {"head": {"age": {year: 70}}},
+        "tax_units": {
+            "tax_unit": {
+                "members": ["head"],
+                "cohabitating_spouses": {year: cohabitating},
+                "az_property_tax_credit_eligible": {year: True},
+            }
+        },
+        "households": {"household": {"members": ["head"], "state_code": {year: "AZ"}}},
+        "axes": [
+            [
+                {
+                    "name": "az_property_tax_credit_income",
+                    "min": 0,
+                    "max": n - 1,
+                    "count": n,
+                    "period": year,
+                }
+            ]
+        ],
+    }
+    sim = Simulation(situation=situation)
+    # Taxes paid exceed every table amount, so the credit is the table amount.
+    sim.set_input("real_estate_taxes", year, np.full(n, 1_000.0))
+    sim.set_input("az_property_tax_credit_income", year, np.asarray(incomes))
+    return sim.calculate("az_property_tax_credit", year)
+
+
+@pytest.mark.parametrize(
+    "name, cohabitating", [("living_alone", False), ("cohabitating", True)]
+)
+def test_credit_matches_statute_in_a_vectorised_simulation(name, cohabitating):
+    table, limit = SCHEDULES[name]
+    year = 2025
+    incomes = np.concatenate([WHOLE_DOLLARS, edge_incomes(table, limit)])
+    got = _credit_by_income(cohabitating, incomes, year)
+    expected = statute_amount(table, limit, incomes)
+    # az_property_tax_credit_income is stored as float32; every income here
+    # rounds to a float32 on the same side of each band edge.
+    wrong = incomes[got != expected]
+    assert wrong.size == 0, f"{name}: wrong at {wrong[:10]}"