Implement Missouri State Supplementary Payment (SSP)

[hua7450]

Summary

Implements Missouri's State Supplementary Payment (SSP) — Supplemental Aid to the Blind (SAB) and Supplemental Nursing Care (SNC) cash supplements paid by DSS Family Support Division to SSI recipients in Missouri.

Closes #8230

Regulatory Authority

• RSMo § 208.010 (general grant authority)
• RSMo § 208.030 (Supplemental Nursing Care)
• RSMo § 209.040 (Supplemental Aid to the Blind / Blind Pension max)
• MO DSS MHABD Appendix J (Eligibility Standards for Non-MAGI Programs, 04/2026) — primary source for current dollar amounts: https://dssmanuals.mo.gov/wp-content/uploads/2022/07/mhabd-appendix-j.pdf#page=4
• SSA "State Assistance Programs for SSI Recipients, January 2011 - Missouri" (cross-verification): https://www.ssa.gov/policy/docs/progdesc/ssi_st_asst/2011/mo.html
• Missouri FY2026 appropriations (SAB max grant cap)

Program Overview

• Administration: State-administered (DSS Family Support Division)
• Funding: State funds
• Current caseload: ~12,000 SAB + ~3,500 SNC recipients (Missouri DSS, FY2024 — approximate, from secondary sources)

Eligibility

Requirement	Source	How Modeled
Must actually receive SSI	RSMo § 208.030.5	ssi > 0 (per CLAUDE.md rule #2 — already implies categorical/resource/income/takeup)
Must reside in Missouri	State program	defined_for = StateCode.MO
Age 18+ for SAB / 21+ for SNC	RSMo § 208.030.5	mo_ssp_age_eligible checks living arrangement and applies appropriate threshold
Living arrangement matches a covered category	RSMo § 208.030.4-5	mo_ssp_living_arrangement enum input + mo_ssp_category_eligible
Title XIX (Medicaid-paid) facility residents excluded	RSMo § 208.030.5	Implicit: no enum value for Medicaid facility — those residents map to NONE
SAB non-SSI income ≤ $1,073/month (eff 2026-01-01)	MO DSS Appendix J	mo_ssp_eligible reads sab.income_limit, applies only when SAB pathway
Closed 1973 hold-harmless cohort	RSMo § 208.030.1-3	Not modeled (closed cohort — no new entrants)
SNC physician medical-need determination	13 CSR 40-2.130(6)	Not modeled (no PolicyEngine input variable)

Benefit Amounts (MO DSS MHABD Appendix J 04/2026)

SAB (Supplemental Aid to the Blind)

SAB grant formula = min( max(0, BP_rate − federal_SSI), max_grant_cap )

Fiscal Year	BP rate (consolidated standard)	Max grant cap (appropriations)	Source
FY2024 (eff. 2023-07-01)	$789/mo	$654/mo	MO DSS Appendix J + FY2024 appropriations
FY2025 (eff. 2024-07-01)	$828/mo	$698/mo	MO DSS Appendix J + FY2025 appropriations
FY2026 (eff. 2025-07-01)	$917/mo	$762/mo	MO DSS Appendix J + FY2026 appropriations

SNC (Supplemental Nursing Care) — frozen since 2000-07-01

Facility Type	Max Monthly Grant	Source
Residential Care Facility I (RCF I)	$156	RSMo § 208.030.5; MO DSS Appendix J
Residential Care Facility II / Assisted Living Facility (RCF II / ALF)	$292	RSMo § 208.030.5; MO DSS Appendix J
Skilled Nursing/Intermediate Care non-Medicaid (SNF/ICF)	$390	RSMo § 208.030.5; MO DSS Appendix J

Personal Needs Allowance (effective 2015-01-01)

• $50/month additional for SNF/ICF non-Medicaid residents

Couple treatment: Each spouse's SAB/SNC is computed independently based on their own SSI and living arrangement (per-person calculation). A couple where both spouses are eligible for the same SNC facility tier receives 2× the individual rate at the SPMUnit level.

COLA: SAB adjusts annually via state appropriations. SNC frozen since 2000-07-01. PNA frozen since 2015-01-01.

Not Modeled (by design)

What	Source	Why Excluded
Closed 1973 hold-harmless cohort	RSMo § 208.030.1-3	Closed cohort — post-1973 entrants ineligible; no new recipients
EIL-based "most beneficial of two methods" SAB calc	DSS Manual 0715.010.10	Only relevant for closed 1973 cohort already excluded
SAB $1 minimum payment when remainder < $0.50	13 CSR 40-2.130(2)(C)	Near-zero population impact
PNA exclusion when recipient receives PNA from another program	RSMo § 208.030.5; 13 CSR 40-2.130(8)	No PolicyEngine input variable for "receives PNA from another program"
SNC physician determination of medical need	13 CSR 40-2.130(6)	No PolicyEngine input for medical-need determination
Separate blind resource limits ($2,000 indiv / $4,000 couple)	SSA 2011 report	ssi > 0 already enforces stricter federal SSI resource limits

Files

policyengine_us/parameters/gov/states/mo/dss/ssp/
├── age_threshold/{sab,snc}.yaml
├── sab/{consolidated_standard,max_grant_cap,income_limit}.yaml
└── snc/
    ├── max_grant/{rcf_level_i,rcf_level_ii_or_alf,snf_or_icf_non_medicaid}.yaml
    └── personal_needs_allowance.yaml

policyengine_us/variables/gov/states/mo/dss/ssp/
├── mo_ssp.py                          # Main benefit (Person, MONTH, USD)
├── mo_ssp_eligible.py                 # Eligibility
├── mo_ssp_living_arrangement.py       # Enum input
├── mo_ssp_personal_needs_allowance.py # PNA add-on
└── eligibility/{mo_ssp_age_eligible,mo_ssp_category_eligible}.py

policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/
├── mo_ssp.yaml                        # 21 cases
├── mo_ssp_eligible.yaml               # 17 cases
├── mo_ssp_personal_needs_allowance.yaml  # 9 cases
└── integration.yaml                   # 8 scenarios (55 tests total)

Plus registry updates in:

• policyengine_us/variables/household/income/spm_unit/spm_unit_benefits.py
• policyengine_us/parameters/gov/household/household_state_benefits.yaml
• policyengine_us/programs.yaml

Verification TODO

• Verify SAB max_grant_cap ($654/$698/$762) against Missouri's FY2024-FY2026 appropriations bills (currently sourced from user-provided FSD/DMH guidance summary; primary appropriations URL not yet identified)
• Verify SAB $1 minimum payment exclusion is acceptable (REQ-009 not modeled)
• Verify pre-FY2024 historical SAB amounts for backdating (current implementation starts at 2023-07-01 with $0 sentinel before that; SSA 2011 report cited $510)
• CI passes

Test plan

• All 55 YAML tests pass locally
• Coverage report: 23/23 in-scope requirements covered, 0 missing
• No hardcoded values in formulas (all reference parameters)
• No is_ssi_eligible & ssi > 0 redundancy (uses ssi > 0 only per CLAUDE.md rule Run black formatting on docs #2)
• CI passes
• Microsimulation test (in benefits aggregator chain)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.78%. Comparing base (623a65c) to head (42c6d24).
⚠️ Report is 113 commits behind head on main.

Additional details and impacted files

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- Coverage   100.00%   94.78%   -5.22%     
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  Files           12        7       -5     
  Lines          173      115      -58     
  Branches         4        2       -2     
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- Hits           173      109      -64     
- Misses           0        6       +6     

Flag	Coverage Δ
unittests	94.78% <100.00%> (-5.22%)	⬇️

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