MaxGhenis · Oct 5, 2026 · Oct 3, 2026 · Oct 3, 2026 · Oct 3, 2026 · Oct 4, 2026
diff --git a/changelog.d/dead-urls-federal.fixed.md b/changelog.d/dead-urls-federal.fixed.md
@@ -0,0 +1 @@
+Replace dead federal and miscellaneous reference URLs (IRS, SSA, CMS, USDA, CBO, Medicaid, KFF, Justia and others) with live successors or pinned Wayback captures, and guard against their return.
diff --git a/policyengine_us/parameters/calibration/gov/cbo/income_by_source.yaml b/policyengine_us/parameters/calibration/gov/cbo/income_by_source.yaml
@@ -14,7 +14,7 @@ metadata:
   - title: Revenue Projections, by Category | Congressional Budget Office | February 2026
     # Source: https://www.cbo.gov/data/budget-economic-data
     # Sheet 3.Individual Income Tax Details
-    href: https://www.cbo.gov/system/files/2026-02/51138-2026-02-Revenue-Projections.xlsx
+    href: https://www.cbo.gov/system/files/2026-02/51138-2026-02-Revenue.xlsx
 adjusted_gross_income:
   metadata:
     label: Total AGI

diff --git a/policyengine_us/parameters/calibration/gov/hhs/medicaid/totals/spending.yaml b/policyengine_us/parameters/calibration/gov/hhs/medicaid/totals/spending.yaml
@@ -14,7 +14,7 @@ metadata:
   - title: Medicaid Spending by State, Category, and Source of Funds, FY 2021 (millions) | MACPAC
     href: https://www.macpac.gov/wp-content/uploads/2022/12/MACSTATS_Dec2022_WEB-508.pdf#page=59
   - title: Total Medicaid Spending | KFF | 2020
-    href: https://web.archive.org/web/20211129161302/https://www.kff.org/medicaid/state-indicator/total-medicaid-spending/?currentTimeframe=0&selectedRows=%7B%22states%22:%7B%22all%22:%7B%7D%7D%7D&sortModel=%7B%22colId%22:%22Location%22,%22sort%22:%22asc%22%7D
+    href: https://web.archive.org/web/20220810000951/https://www.kff.org/medicaid/state-indicator/total-medicaid-spending/?currentTimeframe=0&sortModel=%7B%22colId%22:%22Location%22,%22sort%22:%22asc%22%7D
 
 AL:
   2020-01-01: 6_127_207_059

diff --git a/policyengine_us/parameters/gov/contrib/harris/capital_gains/in_effect.yaml b/policyengine_us/parameters/gov/contrib/harris/capital_gains/in_effect.yaml
@@ -5,7 +5,7 @@ metadata:
   label: Harris capital gains tax reform in effect
   reference: 
     - title: A New Way Forward for the Middle Class
-      href: https://kamalaharris.com/wp-content/uploads/2024/09/Policy_Book_Economic-Opportunity.pdf#page=73
+      href: https://www.kamalaharris.com/wp-content/uploads/2024/09/Policy_Book_Economic-Opportunity.pdf#page=73
 
 values:
   0000-01-01: false
diff --git a/policyengine_us/parameters/gov/ed/pell_grant/efc/automatic_zero.yaml b/policyengine_us/parameters/gov/ed/pell_grant/efc/automatic_zero.yaml
@@ -17,7 +17,7 @@ values:
     metadata:
       reference:
         - title: PELL GRANT ELIGIBILITY CHANGES
-          href: https://www.acct.org/files/Advocacy/Factsheets%20and%20Summaries/pell%20grant%20eligibility%20changes%20website.pdf.
+          href: https://files.eric.ed.gov/fulltext/ED585399.pdf
   2013-08-01:
     value: 24_000
     metadata:

diff --git a/policyengine_us/parameters/gov/hhs/head_start/age_range.yaml b/policyengine_us/parameters/gov/hhs/head_start/age_range.yaml
@@ -24,4 +24,4 @@ metadata:
     - title: U.S. Department of Health & Human Services Head Start Policy and Regulations, 1302.12 Determining, verifying, and documenting eligibility. (b)
       href: https://eclkc.ohs.acf.hhs.gov/policy/45-cfr-chap-xiii/1302-12-determining-verifying-documenting-eligibility
     - title: Federal Reserve Bank of Atlanta, Policy Rules Database (PRD), 2.1.8 Head Start and Early Head Start
-      href: https://www.atlantafed.org/-/media/documents/economic-mobility-and-resilience/advancing-careers-for-low-income-families/policy-rules-database/policy-rules-database-technical-manual.pdf#page=58
+      href: https://github.com/Research-Division/policy-rules-database/blob/a806195682b7515f01b5739343b91201293dddb4/PRD%20Technical%20Manual.pdf#page=57
diff --git a/policyengine_us/parameters/gov/hhs/head_start/early_head_start/age_limit.yaml b/policyengine_us/parameters/gov/hhs/head_start/early_head_start/age_limit.yaml
@@ -11,5 +11,5 @@ metadata:
     - title: U.S. Department of Health & Human Services Head Start Policy and Regulations, 1302.12 Determining, verifying, and documenting eligibility. (b)
       href: https://eclkc.ohs.acf.hhs.gov/policy/45-cfr-chap-xiii/1302-12-determining-verifying-documenting-eligibility
     - title: Federal Reserve Bank of Atlanta, Policy Rules Database (PRD), 2.1.8 Head Start and Early Head Start
-      href: https://www.atlantafed.org/-/media/documents/economic-mobility-and-resilience/advancing-careers-for-low-income-families/policy-rules-database/policy-rules-database-technical-manual.pdf#page=58
+      href: https://github.com/Research-Division/policy-rules-database/blob/a806195682b7515f01b5739343b91201293dddb4/PRD%20Technical%20Manual.pdf#page=57
 
diff --git a/policyengine_us/parameters/gov/hhs/medicaid/eligibility/categories/adult/income_limit.yaml b/policyengine_us/parameters/gov/hhs/medicaid/eligibility/categories/adult/income_limit.yaml
@@ -12,7 +12,7 @@ metadata:
     - title: medicaidscreener.com
       href: https://www.medicaidscreener.com/?p=table
     - title: Medicaid, Children's Health Insurance Program, & Basic Health Program Eligibility Levels
-      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels/index.html
+      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels
     - title: Medicaid and CHIP Eligibility, Enrollment, Renewal, and Cost Sharing Policies as of January 2018
       href: https://files.kff.org/attachment/Report-Medicaid-and-CHIP-Eligibility-Enrollment-Renewal-and-Cost-Sharing-Policies-as-of-January-2018#page=36
     - title: Proposed Extension of Existing Loss of Medicaid SEP | DC Health Benefit Exchange Authority

diff --git a/policyengine_us/parameters/gov/hhs/medicaid/eligibility/categories/infant/income_limit.yaml b/policyengine_us/parameters/gov/hhs/medicaid/eligibility/categories/infant/income_limit.yaml
@@ -12,7 +12,7 @@ metadata:
     - title: medicaidscreener.com
       href: https://www.medicaidscreener.com/?p=table
     - title: Medicaid, Children's Health Insurance Program, & Basic Health Program Eligibility Levels
-      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels/index.html
+      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels
     - title: Medicaid and CHIP Eligibility, Enrollment, Renewal, and Cost Sharing Policies as of January 2018
       href: https://files.kff.org/attachment/Report-Medicaid-and-CHIP-Eligibility-Enrollment-Renewal-and-Cost-Sharing-Policies-as-of-January-2018#page=26
     - title: Medicaid and CHIP Eligibility Levels | CMS Data.Medicaid.gov dataset page (April 1, 2018)

diff --git a/...ngine_us/parameters/gov/hhs/medicaid/eligibility/categories/older_child/income_limit.yaml b/...ngine_us/parameters/gov/hhs/medicaid/eligibility/categories/older_child/income_limit.yaml
@@ -12,7 +12,7 @@ metadata:
     - title: medicaidscreener.com
       href: https://www.medicaidscreener.com/?p=table
     - title: Medicaid, Children's Health Insurance Program, & Basic Health Program Eligibility Levels
-      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels/index.html
+      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels
     - title: Medicaid and CHIP Eligibility, Enrollment, Renewal, and Cost Sharing Policies as of January 2018
       href: https://files.kff.org/attachment/Report-Medicaid-and-CHIP-Eligibility-Enrollment-Renewal-and-Cost-Sharing-Policies-as-of-January-2018#page=26
     - title: Medicaid and CHIP Eligibility Levels | CMS Data.Medicaid.gov dataset page (April 1, 2018)

diff --git a/policyengine_us/parameters/gov/hhs/medicaid/eligibility/categories/parent/income_limit.yaml b/policyengine_us/parameters/gov/hhs/medicaid/eligibility/categories/parent/income_limit.yaml
@@ -14,7 +14,7 @@ metadata:
     - title: medicaidscreener.com
       href: https://www.medicaidscreener.com/?p=table
     - title: Medicaid, Children's Health Insurance Program, & Basic Health Program Eligibility Levels
-      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels/index.html
+      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels
     - title: Medicaid and CHIP Eligibility, Enrollment, Renewal, and Cost Sharing Policies as of January 2018
       href: https://files.kff.org/attachment/Report-Medicaid-and-CHIP-Eligibility-Enrollment-Renewal-and-Cost-Sharing-Policies-as-of-January-2018#page=36
     - title: Proposed Extension of Existing Loss of Medicaid SEP | DC Health Benefit Exchange Authority

diff --git a/...ngine_us/parameters/gov/hhs/medicaid/eligibility/categories/young_adult/income_limit.yaml b/...ngine_us/parameters/gov/hhs/medicaid/eligibility/categories/young_adult/income_limit.yaml
@@ -10,7 +10,7 @@ metadata:
     - title: medicaidscreener.com
       href: https://www.medicaidscreener.com/?p=table
     - title: Medicaid, Children's Health Insurance Program, & Basic Health Program Eligibility Levels
-      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels/index.html
+      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels
     - title: Medicaid and CHIP Eligibility Levels | CMS Data.Medicaid.gov dataset page (April 1, 2018)
       href: https://data.medicaid.gov/dataset/d7e4cccb-1c56-5b5d-acce-5e7744c6d3b4
     - title: Medicaid and CHIP Eligibility Levels | CMS Data.Medicaid.gov CSV download (April 1, 2018)

diff --git a/...ngine_us/parameters/gov/hhs/medicaid/eligibility/categories/young_child/income_limit.yaml b/...ngine_us/parameters/gov/hhs/medicaid/eligibility/categories/young_child/income_limit.yaml
@@ -12,7 +12,7 @@ metadata:
     - title: medicaidscreener.com
       href: https://www.medicaidscreener.com/?p=table
     - title: Medicaid, Children's Health Insurance Program, & Basic Health Program Eligibility Levels
-      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels/index.html
+      href: https://www.medicaid.gov/medicaid/national-medicaid-chip-program-information/medicaid-childrens-health-insurance-program-basic-health-program-eligibility-levels
     - title: Medicaid and CHIP Eligibility, Enrollment, Renewal, and Cost Sharing Policies as of January 2018
       href: https://files.kff.org/attachment/Report-Medicaid-and-CHIP-Eligibility-Enrollment-Renewal-and-Cost-Sharing-Policies-as-of-January-2018#page=26
     - title: Medicaid and CHIP Eligibility Levels | CMS Data.Medicaid.gov dataset page (April 1, 2018)

diff --git a/policyengine_us/parameters/gov/hhs/medicare/part_a/premium_free_quarters_threshold.yaml b/policyengine_us/parameters/gov/hhs/medicare/part_a/premium_free_quarters_threshold.yaml
@@ -5,6 +5,6 @@ metadata:
   label: Premium-free Part A quarters threshold
   reference:
     - title: Medicare.gov - Part A costs
-      href: https://www.medicare.gov/basics/costs/medicare-costs/part-a-costs
+      href: https://www.cms.gov/newsroom/fact-sheets/2026-medicare-parts-b-premiums-deductibles
 values:
   2000-01-01: 40
diff --git a/policyengine_us/parameters/gov/hhs/medicare/part_a/reduced_premium_quarters_threshold.yaml b/policyengine_us/parameters/gov/hhs/medicare/part_a/reduced_premium_quarters_threshold.yaml
@@ -5,6 +5,6 @@ metadata:
   label: Reduced Part A premium quarters threshold
   reference:
     - title: Medicare.gov - Part A costs
-      href: https://www.medicare.gov/basics/costs/medicare-costs/part-a-costs
+      href: https://www.cms.gov/newsroom/fact-sheets/2026-medicare-parts-b-premiums-deductibles
 values:
   2000-01-01: 30
diff --git a/policyengine_us/parameters/gov/hhs/tanf/non_cash/income_limit/gross.yaml b/policyengine_us/parameters/gov/hhs/tanf/non_cash/income_limit/gross.yaml
@@ -113,7 +113,7 @@ OR:
   2022-01-01: 2
 PA:
   2015-10-01: 1.6
-  # https://www.snapscreener.com/blog/pennsylvania-snap-increase
+  # http://services.dpw.state.pa.us/oimpolicymanuals/snap/512_Categorical_Eligibility/512_1_General_Policy.htm
   2022-10-01: 2
 RI:
   2015-10-01: 1.85

diff --git a/policyengine_us/parameters/gov/irs/income/amt/exemption/child/amount.yaml b/policyengine_us/parameters/gov/irs/income/amt/exemption/child/amount.yaml
@@ -16,7 +16,7 @@ metadata:
     - title: 2021 IRS data release
       href: https://www.irs.gov/pub/irs-drop/rp-20-45.pdf#page=12
     - title: 2020 IRS data release
-      href: https://www.irs.gov/pub/irs-drop/rp-19-45.pdf#page=12
+      href: https://www.irs.gov/pub/irs-drop/rp-19-44.pdf#page=12
     - title: 2019 IRS data release
       href: https://www.irs.gov/pub/irs-drop/rp-18-57.pdf#page=15
   uprating: gov.irs.uprating

diff --git a/policyengine_us/parameters/gov/simulation/aime_lookback_years.yaml b/policyengine_us/parameters/gov/simulation/aime_lookback_years.yaml
@@ -7,4 +7,4 @@ metadata:
   label: AIME lookback years
   reference:
     - title: Social Security AIME calculation
-      href: https://www.ssa.gov/OACT/COLA/aime.html
+      href: https://www.ssa.gov/OACT/COLA/Benefits.html#aime
diff --git a/policyengine_us/parameters/gov/ssa/social_security/aime/indexing_age.yaml b/policyengine_us/parameters/gov/ssa/social_security/aime/indexing_age.yaml
@@ -9,6 +9,6 @@ metadata:
     - title: 42 U.S.C. § 415(b)(3)(A)
       href: https://www.law.cornell.edu/uscode/text/42/415#b_3_A
     - title: Social Security POMS RS 00605.020
-      href: https://secure.ssa.gov/poms.nsf/lnx/0300605020
+      href: https://secure.ssa.gov/poms.nsf/lnx/0300605018
     - title: SSA AIME Calculation
-      href: https://www.ssa.gov/OACT/COLA/aime.html
+      href: https://www.ssa.gov/OACT/COLA/Benefits.html#aime
diff --git a/policyengine_us/parameters/gov/states/ga/tax/income/credits/refundable.yaml b/policyengine_us/parameters/gov/states/ga/tax/income/credits/refundable.yaml
@@ -11,4 +11,4 @@ metadata:
   label: Georgia refundable income tax credits
   reference:
     - title: Official Code of Georgia Annotated | O.C.G.A. § 48-7-20.2(b), (d)
-      href: https://law.justia.com/codes/georgia/2022/title-48/chapter-7/article-2/section-48-7-20-2/
+      href: https://www.legis.ga.gov/api/legislation/document/20232024/217823
diff --git a/policyengine_us/parameters/gov/states/ga/tax/income/credits/surplus_tax_rebate/amount.yaml b/policyengine_us/parameters/gov/states/ga/tax/income/credits/surplus_tax_rebate/amount.yaml
@@ -8,7 +8,7 @@ metadata:
   label: Georgia surplus tax rebate amount
   reference:
     - title: Official Code of Georgia Annotated | O.C.G.A. § 48-7-20.2(b)(1)(B)
-      href: https://law.justia.com/codes/georgia/2022/title-48/chapter-7/article-2/section-48-7-20-2/
+      href: https://www.legis.ga.gov/api/legislation/document/20232024/217823
     - title: HB 162 (2023), one-time refund of 2021 income taxes
       href: https://www.legis.ga.gov/api/legislation/document/20232024/217823#page=2
 

diff --git a/policyengine_us/parameters/gov/states/in/fssa/ccdf/income/get_on_fpg_rate.yaml b/policyengine_us/parameters/gov/states/in/fssa/ccdf/income/get_on_fpg_rate.yaml
@@ -18,4 +18,4 @@ metadata:
     - title: Income to Get on CCDF
       href: https://www.in.gov/fssa/carefinder/files/Income-Get-on-CCDF.pdf
     - title: OECOSL bulletin, New CCDF Reimbursement Rates and Expanded Income Eligibility (127% to 150% FPL eff. Aug 1, 2023)
-      href: https://content.govdelivery.com/accounts/INOECOSL/bulletins/366774c
+      href: https://www.in.gov/fssa/carefinder/system-updates-2023
diff --git a/policyengine_us/parameters/gov/states/in/fssa/ccdf/income/stay_on_smi_rate.yaml b/policyengine_us/parameters/gov/states/in/fssa/ccdf/income/stay_on_smi_rate.yaml
@@ -12,4 +12,4 @@ metadata:
     - title: Income to Stay On CCDF
       href: https://www.in.gov/fssa/carefinder/files/Income-Stay-On-CCDF.pdf
     - title: OECOSL bulletin, New CCDF Reimbursement Rates and Expanded Income Eligibility (eff. Aug 1, 2023)
-      href: https://content.govdelivery.com/accounts/INOECOSL/bulletins/366774c
+      href: https://www.in.gov/fssa/carefinder/system-updates-2023
diff --git a/policyengine_us/parameters/gov/states/in/fssa/ccdf/rates/full_time.yaml b/policyengine_us/parameters/gov/states/in/fssa/ccdf/rates/full_time.yaml
@@ -27,7 +27,7 @@ metadata:
     - title: OECOSL press release, Updated Child Care Voucher Rates (Sept. 4, 2025; percentage cuts by age group)
       href: https://www.in.gov/fssa/carefinder/files/Updated-Child-Care-Voucher-Rates-.pdf
     - title: OECOSL bulletin, CCDF reimbursement rate changes effective Oct. 5, 2025
-      href: https://content.govdelivery.com/accounts/INOECOSL/bulletins/3f4db24
+      href: https://www.in.gov/fssa/carefinder/files/ReimbursementRateFAQs.pdf
 
 LICENSED_CENTER:
   BASE:

diff --git a/...engine_us/parameters/gov/states/ms/tax/income/adjustments/plan_529_contributions/cap.yaml b/...engine_us/parameters/gov/states/ms/tax/income/adjustments/plan_529_contributions/cap.yaml
@@ -8,7 +8,7 @@ metadata:
   - filing_status
   reference:
   - title: Mississippi Code § 27-7-18(2)
-    href: https://law.justia.com/codes/mississippi/2022/title-27/chapter-7/article-1/section-27-7-18/
+    href: https://billstatus.ls.state.ms.us/documents/2017/pdf/SB/2300-2399/SB2311SG.pdf#page=53
   - title: Mississippi Income Tax Instructions 2025
     href: https://www.dor.ms.gov/sites/default/files/tax-forms/individual/80100251%202.pdf#page=12
 

diff --git a/...ters/gov/states/nd/tax/income/taxable_income/subtractions/plan_529_contributions/cap.yaml b/...ters/gov/states/nd/tax/income/taxable_income/subtractions/plan_529_contributions/cap.yaml
@@ -8,7 +8,7 @@ metadata:
   - filing_status
   reference:
   - title: North Dakota Century Code § 57-38-30.3(2)(p)
-    href: https://law.justia.com/codes/north-dakota/2022/title-57/chapter-57-38/section-57-38-30-3/
+    href: https://ndlegis.gov/cencode/t57c38.pdf#page=34
   - title: 2025 North Dakota income tax instructions
     href: https://www.tax.nd.gov/sites/www/files/documents/forms/individual/2025-iit/2025-individual-income-tax-booklet.pdf#page=14
 

diff --git a/policyengine_us/parameters/gov/states/pa/tax/income/forgiveness/base.yaml b/policyengine_us/parameters/gov/states/pa/tax/income/forgiveness/base.yaml
@@ -7,7 +7,7 @@ metadata:
   label: PA base eligibility income
   reference:
     - title: PA PIT Guide - Chapter 20, Tax Forgiveness, page 15
-      href: https://woodacctservices.com/publications/PA%20Income%20Tax%20Forgiveness%20Chart.pdf#page=15
+      href: https://www.pa.gov/content/dam/copapwp-pagov/en/revenue/documents/formsandpublications/papersonalincometaxguide/documents/pitguide_taxforgiveness.pdf#page=8
     - title: PA Form PA-40 Instructions, page 39
       href: https://www.pa.gov/content/dam/copapwp-pagov/en/revenue/documents/formsandpublications/formsforindividuals/pit/documents/2021/2021_pa-40in.pdf#page=39
     - title: 2024 Pennsylvania Personal Income Tax Return Instructions (PA-40 IN), PA SCHEDULE SP (LINE 21), Section III

diff --git a/policyengine_us/parameters/gov/states/pa/tax/income/forgiveness/dependent_rate.yaml b/policyengine_us/parameters/gov/states/pa/tax/income/forgiveness/dependent_rate.yaml
@@ -7,7 +7,7 @@ metadata:
   label: PA tax forgiveness rate increase for each additional dependent
   reference:
     - title: PA PIT Guide - Chapter 20, Tax Forgiveness, page 15
-      href: https://woodacctservices.com/publications/PA%20Income%20Tax%20Forgiveness%20Chart.pdf#page=15
+      href: https://www.pa.gov/content/dam/copapwp-pagov/en/revenue/documents/formsandpublications/papersonalincometaxguide/documents/pitguide_taxforgiveness.pdf#page=9
     - title: PA Form PA-40 Instructions, page 39
       href: https://www.pa.gov/content/dam/copapwp-pagov/en/revenue/documents/formsandpublications/formsforindividuals/pit/documents/2021/2021_pa-40in.pdf#page=39
     - title: 2024 Pennsylvania Personal Income Tax Return Instructions (PA-40 IN), PA SCHEDULE SP (LINE 21), Section III

diff --git a/...engine_us/parameters/gov/states/pa/tax/income/forgiveness/eligibility_income_sources.yaml b/...engine_us/parameters/gov/states/pa/tax/income/forgiveness/eligibility_income_sources.yaml
@@ -18,6 +18,6 @@ metadata:
   label: PA eligibility income sources
   reference:
     - title: PA PIT Guide - Chapter 20, Tax Forgiveness, page 15
-      href: https://woodacctservices.com/publications/PA%20Income%20Tax%20Forgiveness%20Chart.pdf#page15
+      href: https://www.pa.gov/content/dam/copapwp-pagov/en/revenue/documents/formsandpublications/papersonalincometaxguide/documents/pitguide_taxforgiveness.pdf#page=5
     - title: PA Form PA-40 Instructions, page 1
       href: https://www.pa.gov/content/dam/copapwp-pagov/en/revenue/documents/formsandpublications/formsforindividuals/pit/documents/2021/2021_pa-40in.pdf#page=39
diff --git a/policyengine_us/parameters/gov/states/pa/tax/income/forgiveness/rate_increment.yaml b/policyengine_us/parameters/gov/states/pa/tax/income/forgiveness/rate_increment.yaml
@@ -7,7 +7,7 @@ metadata:
   label: PA tax forgiveness rate decrease for each additional increment of eligibility income
   reference:
     - title: PA PIT Guide - Chapter 20, Tax Forgiveness, page 15
-      href: https://woodacctservices.com/publications/PA%20Income%20Tax%20Forgiveness%20Chart.pdf#page=15
+      href: https://www.pa.gov/content/dam/copapwp-pagov/en/revenue/documents/formsandpublications/papersonalincometaxguide/documents/pitguide_taxforgiveness.pdf#page=8
     - title: PA Form PA-40 Instructions, page 39
       href: https://www.pa.gov/content/dam/copapwp-pagov/en/revenue/documents/formsandpublications/formsforindividuals/pit/documents/2021/2021_pa-40in.pdf#page=39
     - title: 2024 Pennsylvania Personal Income Tax Return Instructions (PA-40 IN), PA SCHEDULE SP (LINE 21), Section III

diff --git a/policyengine_us/parameters/gov/states/pa/tax/income/forgiveness/tax_back.yaml b/policyengine_us/parameters/gov/states/pa/tax/income/forgiveness/tax_back.yaml
@@ -7,7 +7,7 @@ metadata:
   label: PA tax forgiveness percentage
   reference:
     - title: PA PIT Guide - Chapter 20, Tax Forgiveness, page 15
-      href: https://woodacctservices.com/publications/PA%20Income%20Tax%20Forgiveness%20Chart.pdf#page=15
+      href: https://www.pa.gov/content/dam/copapwp-pagov/en/revenue/documents/formsandpublications/papersonalincometaxguide/documents/pitguide_taxforgiveness.pdf#page=9
     - title: PA Form PA-40 Instructions, page 39
       href: https://www.pa.gov/content/dam/copapwp-pagov/en/revenue/documents/formsandpublications/formsforindividuals/pit/documents/2021/2021_pa-40in.pdf#page=39
     - title: 2024 Pennsylvania Personal Income Tax Return Instructions (PA-40 IN), PA SCHEDULE SP (LINE 21), Section III

diff --git a/policyengine_us/parameters/gov/states/tx/dta/csfp/fpg_limit.yaml b/policyengine_us/parameters/gov/states/tx/dta/csfp/fpg_limit.yaml
@@ -7,4 +7,4 @@ metadata:
   label: Texas Commodity Supplemental Food Program FPG limit
   reference:
     - title: Texas Department of Agriculture Commodity Supplemental Food Program Income Eligibility Guidelines for the Elderly
-      href: https://squaremeals.org/Portals/8/FND%20Forms/Program%20Forms/H1666%202025%20Income%20Eligibility%20Guidelines%20for%20the%20Elderly_.pdf?ver=joHDl3vcgPiW3mdgaMM7vA%3d%3d
+      href: https://web.archive.org/web/20251104061444/https://squaremeals.org/Portals/8/FND%20Forms/Program%20Forms/H1666%202025%20Income%20Eligibility%20Guidelines%20for%20the%20Elderly_.pdf?ver=joHDl3vcgPiW3mdgaMM7vA%3d%3d
diff --git a/policyengine_us/parameters/gov/usda/csfp/amount.yaml b/policyengine_us/parameters/gov/usda/csfp/amount.yaml
@@ -15,7 +15,7 @@ metadata:
   label: Commodity Supplemental Food Program amount
   reference:
     - title: Commodity Supplemental Food Program Fact Sheet (2019)
-      href: https://fns-prod.azureedge.us/sites/default/files/resource-files/csfp-program-fact-sheet-2019.pdf
+      href: https://web.archive.org/web/20230422132035/https://fns-prod.azureedge.us/sites/default/files/resource-files/csfp-program-fact-sheet-2019.pdf
     - title: CSFP Final Caseload Assignments for the 2020 Caseload Cycle
       href: https://www.fns.usda.gov/csfp/final-caseload-assignments-2020-caseload-cycle
     - title: CSFP Additional Caseload Assignments for the 2021 Caseload Cycle

diff --git a/policyengine_us/parameters/gov/usda/csfp/fpg_limit.yaml b/policyengine_us/parameters/gov/usda/csfp/fpg_limit.yaml
@@ -10,4 +10,4 @@ metadata:
     - title: COMMODITY SUPPLEMENTAL FOOD PROGRAM | 247.9 Eligibility requirements
       href: https://www.ecfr.gov/current/title-7/part-247#p-247.9(b)
     - title: Commodity Supplemental Food Program (CSFP) | Revised Income Guidelines
-      href: https://fns-prod.azureedge.us/sites/default/files/resource-files/csfp-revised-incomeGuidelines2024.pdf
+      href: https://web.archive.org/web/20250202034640/https://fns-prod.azureedge.us/sites/default/files/resource-files/csfp-revised-incomeGuidelines2024.pdf
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Replace dead federal and miscellaneous reference URLs (IRS, SSA, CMS, USDA, CBO, Medicaid, KFF, Justia and others) with live successors or pinned Wayback captures, and guard against their return.