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Backdate Massachusetts SSP parameters to 2002#7798

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mattunrath wants to merge 2 commits intoPolicyEngine:mainfrom
mattunrath:add-ma-ssp
Open

Backdate Massachusetts SSP parameters to 2002#7798
mattunrath wants to merge 2 commits intoPolicyEngine:mainfrom
mattunrath:add-ma-ssp

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Summary

Backdates Massachusetts State Supplement Program (SSP) payment standards from 2022 to 2002 using SSA State Assistance Reports and computed values from the federal SSI benefit rate.
Closes #7797

Changes

  • Parameters backdated: 1 file (amount.yaml), extended from 2022-01-01 to 2002-01-01
  • Constant amounts (most categories): Single date entry at 2002-01-01 since values haven't changed
  • FBR-dependent amounts (blind couple, rest home couple, blind household-of-another): Year-by-year entries computed from FBR_individual - FBR_couple/2
  • Medicaid facility: Added historical value of $35.00 (2002-2007), confirmed transition to $42.80 in 2008
  • Tests added: 7 new historical test cases (2002, 2005, 2009, 2011) covering multiple living arrangements
  • References added: SSA State Assistance Reports for 2002, 2005, 2011

Key Findings

Most MA SSP supplement amounts have been constant since at least 2002:

Category Living Independently (individual)
Aged $128.82/month
Blind $149.74/month
Disabled $114.39/month

The combined federal+state amounts change yearly because the federal FBR changes, but the state supplement portion stays fixed.

Regulatory Sources

Test Plan

  • All 13 existing + new tests pass
  • Code formatting passes (make format)
  • Historical values verified against SSA State Assistance Reports (2002-2011)
  • Computed values (2012-2021) verified via formula: individual_SSP + (FBR_individual - FBR_couple/2)

🤖 Generated with Claude Code

mattunrath and others added 2 commits March 17, 2026 21:26
Extends MA State Supplement Program payment standards from 2022 back to
2002 using SSA State Assistance Reports (2002-2011) and computed values
from the federal SSI benefit rate for 2012-2021.

Key changes:
- Most SSP amounts are constant since 2002 (e.g., aged $128.82, blind
  $149.74, disabled $114.39 for living independently)
- Blind couple and rest home couple amounts vary yearly (computed from
  FBR individual minus FBR couple/2)
- Medicaid facility SSP was $35 (2002-2007), changed to $42.80 in 2008
- Added 7 new historical test cases covering 2002, 2005, 2009, 2011
- All 13 tests pass

Closes PolicyEngine#7797

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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codecov bot commented Mar 18, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.23%. Comparing base (a357860) to head (78d01bc).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files
@@            Coverage Diff             @@
##             main    #7798      +/-   ##
==========================================
+ Coverage   73.68%   74.23%   +0.54%     
==========================================
  Files        3909     3909              
  Lines       56401    56401              
  Branches      270      270              
==========================================
+ Hits        41560    41869     +309     
+ Misses      14821    14508     -313     
- Partials       20       24       +4     
Flag Coverage Δ
unittests 74.23% <ø> (+0.54%) ⬆️

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Add Massachusetts State Supplementary Payment (SSP) program

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