MaxGhenis · Oct 4, 2026 · Oct 3, 2026 · Oct 3, 2026 · Oct 4, 2026
diff --git a/changelog.d/dead-urls-west.fixed.md b/changelog.d/dead-urls-west.fixed.md
@@ -0,0 +1 @@
+Replace dead Montana, Idaho, Utah, Colorado, New Mexico, Washington and Arizona reference URLs with live successors or pinned Wayback captures, and guard against their return.
diff --git a/policyengine_us/parameters/gov/contrib/states/mt/hb268/amount.yaml b/policyengine_us/parameters/gov/contrib/states/mt/hb268/amount.yaml
@@ -17,4 +17,4 @@ metadata:
   label: Montana HB268 credit amount
   reference:
     - title: 2023 Montana Legislature, House Bill No. 268, Section 1(2) & Section 1(7)(c)
-      href: https://leg.mt.gov/bills/2023/billhtml/HB0268.htm
+      href: https://docs.legmt.gov/download-ticket?ticketId=6a5df83b-5948-4d76-ba4d-232fc26f9faa
diff --git a/policyengine_us/parameters/gov/contrib/states/mt/hb268/in_effect.yaml b/policyengine_us/parameters/gov/contrib/states/mt/hb268/in_effect.yaml
@@ -9,4 +9,4 @@ metadata:
   label: Montana HB268 in effect
   reference:
     - title: 2023 Montana Legislature, House Bill No. 268, Section 1(2) & Section 1(7)(c)
-      href: https://leg.mt.gov/bills/2023/billhtml/HB0268.htm
+      href: https://docs.legmt.gov/download-ticket?ticketId=6a5df83b-5948-4d76-ba4d-232fc26f9faa
diff --git a/policyengine_us/parameters/gov/contrib/states/mt/hb268/income_limit/agi.yaml b/policyengine_us/parameters/gov/contrib/states/mt/hb268/income_limit/agi.yaml
@@ -7,4 +7,4 @@ metadata:
   label: Montana HB268 adjusted gross income limit
   reference:
     - title: 2023 Montana Legislature, House Bill No. 268, Section 1(7)(d)
-      href: https://leg.mt.gov/bills/2023/billhtml/HB0268.htm
+      href: https://docs.legmt.gov/download-ticket?ticketId=6a5df83b-5948-4d76-ba4d-232fc26f9faa
diff --git a/policyengine_us/parameters/gov/contrib/states/mt/hb268/income_limit/investment.yaml b/policyengine_us/parameters/gov/contrib/states/mt/hb268/income_limit/investment.yaml
@@ -7,4 +7,4 @@ metadata:
   label: Montana HB268 investment income limit
   reference:
     - title: 2023 Montana Legislature, House Bill No. 268, Section 1(4)(b)
-      href: https://leg.mt.gov/bills/2023/billhtml/HB0268.htm
+      href: https://docs.legmt.gov/download-ticket?ticketId=6a5df83b-5948-4d76-ba4d-232fc26f9faa
diff --git a/policyengine_us/parameters/gov/contrib/states/mt/hb268/reduction/amount.yaml b/policyengine_us/parameters/gov/contrib/states/mt/hb268/reduction/amount.yaml
@@ -7,4 +7,4 @@ metadata:
   label: Montana HB268 reduction amount
   reference:
     - title: 2023 Montana Legislature, House Bill No. 268, Section 1(6)
-      href: https://leg.mt.gov/bills/2023/billhtml/HB0268.htm
+      href: https://docs.legmt.gov/download-ticket?ticketId=6a5df83b-5948-4d76-ba4d-232fc26f9faa
diff --git a/policyengine_us/parameters/gov/contrib/states/mt/hb268/reduction/increment.yaml b/policyengine_us/parameters/gov/contrib/states/mt/hb268/reduction/increment.yaml
@@ -7,4 +7,4 @@ metadata:
   label: Montana HB268 reduction increment
   reference:
     - title: 2023 Montana Legislature, House Bill No. 268, Section 1(6)
-      href: https://leg.mt.gov/bills/2023/billhtml/HB0268.htm
+      href: https://docs.legmt.gov/download-ticket?ticketId=6a5df83b-5948-4d76-ba4d-232fc26f9faa
diff --git a/policyengine_us/parameters/gov/contrib/states/mt/hb268/reduction/threshold.yaml b/policyengine_us/parameters/gov/contrib/states/mt/hb268/reduction/threshold.yaml
@@ -7,4 +7,4 @@ metadata:
   label: Montana HB268 reduction threshold
   reference:
     - title: 2023 Montana Legislature, House Bill No. 268, Section 1(6)
-      href: https://leg.mt.gov/bills/2023/billhtml/HB0268.htm
+      href: https://docs.legmt.gov/download-ticket?ticketId=6a5df83b-5948-4d76-ba4d-232fc26f9faa
diff --git a/policyengine_us/parameters/gov/local/co/denver/dhs/elderly_age_threshold.yaml b/policyengine_us/parameters/gov/local/co/denver/dhs/elderly_age_threshold.yaml
@@ -9,4 +9,4 @@ metadata:
     - title: Denver, Colorado Code of Ordinances Chapter 53 Article XI Sec. 53-492 (i)
       href: https://library.municode.com/co/denver/codes/code_of_ordinances?nodeId=TITIIREMUCO_CH53TAMIRE_ARTXIREPRTAASELLCOPROWTE_S53-491LEIN
     - title: Denver property tax relief program instructions 2023
-      href: https://denvergov.org/files/assets/public/v/2/denver-human-services/documents/property-tax-relief/dptr-instructions-2023.pdf#page=1
+      href: https://web.archive.org/web/20240803030400/https://denvergov.org/files/assets/public/v/2/denver-human-services/documents/property-tax-relief/dptr-instructions-2023.pdf#page=1
diff --git a/...yengine_us/parameters/gov/local/co/denver/dhs/property_tax_relief/ami_rate/homeowner.yaml b/...yengine_us/parameters/gov/local/co/denver/dhs/property_tax_relief/ami_rate/homeowner.yaml
@@ -7,6 +7,6 @@ metadata:
   label: Denver homeowner AMI income limit
   reference:
     - title: Denver property tax relief program instructions 2023
-      href: https://denvergov.org/files/assets/public/v/2/denver-human-services/documents/property-tax-relief/dptr-instructions-2023.pdf#page=1
+      href: https://web.archive.org/web/20240803030400/https://denvergov.org/files/assets/public/v/2/denver-human-services/documents/property-tax-relief/dptr-instructions-2023.pdf#page=1
     - title: Denver, Colorado Code of Ordinances Chapter 53 Article XI Sec. 53-495 (d)(5)
       href: https://library.municode.com/co/denver/codes/code_of_ordinances?nodeId=TITIIREMUCO_CH53TAMIRE_ARTXIREPRTAASELLCOPROWTE_S53-491LEIN
diff --git a/policyengine_us/parameters/gov/local/co/denver/dhs/property_tax_relief/ami_rate/renter.yaml b/policyengine_us/parameters/gov/local/co/denver/dhs/property_tax_relief/ami_rate/renter.yaml
@@ -21,6 +21,6 @@ metadata:
   label: Denver renter AMI income limit
   reference:
     - title: Denver property tax relief program instructions 2023
-      href: https://denvergov.org/files/assets/public/v/2/denver-human-services/documents/property-tax-relief/dptr-instructions-2023.pdf#page=1
+      href: https://web.archive.org/web/20240803030400/https://denvergov.org/files/assets/public/v/2/denver-human-services/documents/property-tax-relief/dptr-instructions-2023.pdf#page=1
     - title: Denver, Colorado Code of Ordinances Chapter 53 Article XI Sec. 53-495 (e)(5)
       href: https://library.municode.com/co/denver/codes/code_of_ordinances?nodeId=TITIIREMUCO_CH53TAMIRE_ARTXIREPRTAASELLCOPROWTE_S53-491LEIN
diff --git a/policyengine_us/parameters/gov/local/co/denver/dhs/property_tax_relief/amount/homeowner.yaml b/policyengine_us/parameters/gov/local/co/denver/dhs/property_tax_relief/amount/homeowner.yaml
@@ -7,7 +7,7 @@ metadata:
   label: Denver property tax relief program homeowner amount
   reference:
     - title: Denver property tax relief program rule #g
-      href: https://denvergov.org/files/content/public/v/37/government/agencies-departments-offices/agencies-departments-offices-directory/denver-human-services/be-supported/additional-assistance/property-tax-relief/denver-property-tax-relief-program-year-2021-rules.pdf#page=2
+      href: https://web.archive.org/web/20240804043816/https://denvergov.org/files/content/public/v/37/government/agencies-departments-offices/agencies-departments-offices-directory/denver-human-services/be-supported/additional-assistance/property-tax-relief/denver-property-tax-relief-program-year-2021-rules.pdf#page=2
     - title: Denver, Colorado Code of Ordinances Chapter 53 Article XI Sec. 53-497 (c)
       href: https://library.municode.com/co/denver/codes/code_of_ordinances?nodeId=TITIIREMUCO_CH53TAMIRE_ARTXIREPRTAASELLCOPROWTE_S53-491LEIN
 
diff --git a/policyengine_us/parameters/gov/local/co/denver/dhs/property_tax_relief/amount/renter.yaml b/policyengine_us/parameters/gov/local/co/denver/dhs/property_tax_relief/amount/renter.yaml
@@ -7,7 +7,7 @@ metadata:
   label: Denver property tax relief program renter amount 
   reference:
     - title: Denver property tax relief program rule #g
-      href: https://denvergov.org/files/content/public/v/37/government/agencies-departments-offices/agencies-departments-offices-directory/denver-human-services/be-supported/additional-assistance/property-tax-relief/denver-property-tax-relief-program-year-2021-rules.pdf#page=2
+      href: https://web.archive.org/web/20240804043816/https://denvergov.org/files/content/public/v/37/government/agencies-departments-offices/agencies-departments-offices-directory/denver-human-services/be-supported/additional-assistance/property-tax-relief/denver-property-tax-relief-program-year-2021-rules.pdf#page=2
     - title: Denver, Colorado Code of Ordinances Chapter 53 Article XI Sec. 53-497 (c)
       href: https://library.municode.com/co/denver/codes/code_of_ordinances?nodeId=TITIIREMUCO_CH53TAMIRE_ARTXIREPRTAASELLCOPROWTE_S53-491LEIN
 
diff --git a/policyengine_us/parameters/gov/local/co/denver/dhs/property_tax_relief/income_sources.yaml b/policyengine_us/parameters/gov/local/co/denver/dhs/property_tax_relief/income_sources.yaml
@@ -20,4 +20,4 @@ metadata:
   label: Denver property tax relief income sources
   reference:
     - title: Denver property tax relief program instructions 2023
-      href: https://denvergov.org/files/assets/public/v/2/denver-human-services/documents/property-tax-relief/dptr-instructions-2023.pdf#page=2
+      href: https://web.archive.org/web/20240803030400/https://denvergov.org/files/assets/public/v/2/denver-human-services/documents/property-tax-relief/dptr-instructions-2023.pdf#page=2
diff --git a/policyengine_us/parameters/gov/states/az/tax/income/subtractions/subtractions.yaml b/policyengine_us/parameters/gov/states/az/tax/income/subtractions/subtractions.yaml
@@ -51,7 +51,7 @@ metadata:
   label: Arizona adjusted gross income subtractions
   reference:
     - title: 2025 Arizona MCTCP Worksheet (Form 140 Page 6, Items V/W/X/Y)
-      href: https://azdor.gov/sites/default/files/document/FORMS_INDIVIDUAL_2025_MCTCP_0.pdf
+      href: https://azdor.gov/sites/default/files/document/FORMS_INDIVIDUAL_2025_MCTCP.pdf
     - title: Arizona Executive Order 2025-15
       href: https://azgovernor.gov/office-arizona-governor/executive-order/2025-15
     - title: 2025 Arizona Form 140 Resident Personal Income Tax Instructions, Line 36

diff --git a/...e_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/child_age_threshold.yaml b/...e_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/child_age_threshold.yaml
@@ -8,7 +8,7 @@ metadata:
     - title: 2021 Colorado Individual Income Tax Filing Guide, 104 Book, page 44, Eligible, 4, b
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=44
     - title: 2022 Colorado Individual Income Tax Filing Guide, 104 Book, page 46, Eligible, 4, b
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=46 
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2022.pdf#page=46 
     - title: 2023 Colorado Individual Income Tax Filing Guide, 104 Book, page 48, Eligible, 4, b
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=48
     - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book, page 67, Eligible, 4, b

diff --git a/...us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/federal_agi_threshold.yaml b/...us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/federal_agi_threshold.yaml
@@ -8,7 +8,7 @@ metadata:
     - title: 2021 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=44 
     - title: 2022 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=46 
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2022.pdf#page=46 
     - title: 2023 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=48
     - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV

diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/max_amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/max_amount.yaml
@@ -11,7 +11,7 @@ metadata:
     - title: 2021 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV Table A
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=46
     - title: 2022 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV Table A
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=48 
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2022.pdf#page=48 
     - title: 2023 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV Table A
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=50
     - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV Table A

diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/rate.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/rate.yaml
@@ -7,7 +7,7 @@ metadata:
     - title: Colorado revised statutes, Section 39-22-119.5 - Child care expenses tax credit (3)(b)
       href: https://law.justia.com/codes/colorado/title-39/specific-taxes/income-tax/article-22/part-1/section-39-22-119-5/
     - title: 2022 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV Line 10
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=48 
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2022.pdf#page=48 
     - title: 2021 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV Line 10
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=46
     - title: 2023 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV Line 10

diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/match.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/match.yaml
@@ -9,7 +9,7 @@ metadata:
     - title: Colorado Revised Statutes Annotated, Title 39. Taxation (§§ 39-1-101 — 39-36-107), Specific Taxes (§§ 39-20-101 — 39-36-107), Income Tax (Art. 22)Article 22., Income Tax (Pts. 1 — 53), Part 1. General (§§ 39-22-101 — 39-22-129) (1.7)
       href: https://advance.lexis.com/documentpage/teaserdocument/?pdmfid=1000516&crid=332c1448-d489-4eb9-8b41-1b2a309a2480&config=014FJAAyNGJkY2Y4Zi1mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFBvZENhdGFsb2d592qv2Kywlf8caKqYROP5&pddocfullpath=%2Fshared%2Fdocument%2Fstatutes-legislation%2Furn%3AcontentItem%3A65HV-06G3-CGX8-050B-00008-00&pddocid=urn%3AcontentItem%3A65HV-06G3-CGX8-050B-00008-00&pdcontentcomponentid=234176&pdteaserkey=h1&pditab=allpods&ecomp=7s65kkk&earg=sr0&prid=2f64ea9c-fb0a-423d-8792-dccfebe94d6c
     - title: 2022 Colorado Individual Income Tax Filing Guide, 104 Book, Part III Line 7
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=48
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2022.pdf#page=48
     - title: 2023 Colorado Individual Income Tax Filing Guide, 104 Book, Part III Line 7
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=50
     - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book, Part III Line 7

diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/age_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/age_threshold.yaml
@@ -20,7 +20,7 @@ metadata:
     - title: 2023 Colorado Child Tax Credit, Applicable Percentage Table
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2023.pdf#page=1
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=2
     - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 1
       href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
       # Colorado introduced the child tax credit in 2022.
diff --git a/...cyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/head_of_household.yaml b/...cyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/head_of_household.yaml
@@ -9,7 +9,7 @@ metadata:
     - title: House Bill 23-1112, Section 2, (4.5), (a), (I)
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=5
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=2
     - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 brackets:

diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/joint.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/joint.yaml
@@ -9,7 +9,7 @@ metadata:
     - title: House Bill 23-1112, Section 2, (4.5), (a), (II)
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=6
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=2
     - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 brackets:

diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/separate.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/separate.yaml
@@ -9,7 +9,7 @@ metadata:
     - title: House Bill 23-1112, Section 2, (4.5), (a), (I)
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=5
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=2
     - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 brackets:

diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/single.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/single.yaml
@@ -9,7 +9,7 @@ metadata:
     - title: House Bill 23-1112, Section 2, (4.5), (a), (I)
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=5
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=2
     - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 brackets:

diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/surviving_spouse.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/surviving_spouse.yaml
@@ -9,7 +9,7 @@ metadata:
     - title: House Bill 23-1112, Section 2, (4.5), (a), (I)
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=5
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=2
     - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 brackets:

diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/eitc/match.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/eitc/match.yaml
@@ -20,12 +20,12 @@ metadata:
     - title: C.R.S. 39-22-123.5
       href: https://advance.lexis.com/documentpage/?pdmfid=1000516&crid=ad7daeaa-b9cd-4f50-9c62-7bddb226d77c&nodeid=ABPAACAACAABAACABH&nodepath=%2FROOT%2FABP%2FABPAAC%2FABPAACAAC%2FABPAACAACAAB%2FABPAACAACAABAAC%2FABPAACAACAABAACABH&level=6&haschildren=&populated=false&title=39-22-123.5.+Earned+income+tax+credit+-+legislative+declaration+-+repeal.&config=014FJAAyNGJkY2Y4Zi1mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFBvZENhdGFsb2d592qv2Kywlf8caKqYROP5&pddocfullpath=%2Fshared%2Fdocument%2Fstatutes-legislation%2Furn%3AcontentItem%3A6B7G-SG43-RTYH-3036-00008-00&ecomp=6gf59kk&prid=22d89c10-a7eb-48af-90ff-837a5559904e
     - title: Individual Estimated Income Tax
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104EP_2023.pdf
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104EP_2022_0.pdf
     # Increases not yet reflected in the legal code.
     - title: HB24-1134
       href: https://leg.colorado.gov/bills/hb24-1134
     - title: 2022 Colorado Individual Income Tax Filing Guide, Line 5
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=16
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_104_Book_2022.pdf#page=16
     - title: 2023 Colorado Individual Tax Filing Guide 104 Book, Line 5
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=18
     - title: 2024 Colorado Individual Tax Filing Guide 104 Book, Instructions for Select Credits from the DR 0104CR, Line 5

diff --git a/...e_us/parameters/gov/states/co/tax/income/credits/family_affordability/age_multiplier.yaml b/...e_us/parameters/gov/states/co/tax/income/credits/family_affordability/age_multiplier.yaml
@@ -9,7 +9,7 @@ metadata:
     - title: Colorado General Assembly House Bill 24-1311 Family Affordability Tax Credit
       href: https://leg.colorado.gov/bills/hb24-1311
     - title: 2024 Colorado Child Tax Credit Instructions, Section C
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=3
     - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section C
       href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=27
 brackets:

diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/amount.yaml
@@ -10,6 +10,6 @@ metadata:
     - title: Colorado General Assembly House Bill 24-1311 Family Affordability Tax Credit
       href: https://leg.colorado.gov/bills/hb24-1311
     - title: 2024 Colorado Child Tax Credit Instructions, Section C
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=3
     - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section C
       href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=27
diff --git a/...parameters/gov/states/co/tax/income/credits/family_affordability/reduction/increment.yaml b/...parameters/gov/states/co/tax/income/credits/family_affordability/reduction/increment.yaml
@@ -12,7 +12,7 @@ metadata:
     - title: Colorado General Assembly House Bill 24-1311 Family Affordability Tax Credit
       href: https://leg.colorado.gov/bills/hb24-1311
     - title: 2024 Colorado Child Tax Credit Instructions, Section C
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=3
     - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section C
       href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=27
 

diff --git a/...e_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/rate.yaml b/...e_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/rate.yaml
@@ -7,7 +7,7 @@ metadata:
     - title: Colorado General Assembly House Bill 24-1311 Family Affordability Tax Credit
       href: https://leg.colorado.gov/bills/hb24-1311
     - title: 2024 Colorado Child Tax Credit Instructions, Section C
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=3
     - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section C
       href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=27
 values:

diff --git a/...parameters/gov/states/co/tax/income/credits/family_affordability/reduction/threshold.yaml b/...parameters/gov/states/co/tax/income/credits/family_affordability/reduction/threshold.yaml
@@ -15,7 +15,7 @@ metadata:
   - title: Colorado General Assembly House Bill 24-1311 Family Affordability Tax Credit
     href: https://leg.colorado.gov/bills/hb24-1311
   - title: 2024 Colorado Child Tax Credit Instructions, Section C
-    href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3
+    href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2024.pdf#page=3
   - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section C
     href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=27
 SINGLE:
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Replace dead Montana, Idaho, Utah, Colorado, New Mexico, Washington and Arizona reference URLs with live successors or pinned Wayback captures, and guard against their return.