Apply 416.1163(e)(2) to deemed SSI and identify SSI couples by marriage, not tax roles

changelog.d/capi-income-precision.fixed.md

@@ -0,0 +1 @@
+We prevent floating-point residuals from creating CAPI income eligibility when a couple's income and SSI/SSP exhaust their payment standard.

changelog.d/ssi-couples-and-deeming-cap.fixed.md

@@ -0,0 +1,4 @@
+SSI under spousal income deeming is now the lesser of the couple computation and the individual Federal benefit rate less the person's own countable income (20 CFR 416.1163(e)(2)), not the couple computation capped at the individual rate; uncapped_ssi applies the same rule, so state supplements that read it see the federal shortfall. SSI couples are now identified by the co-resident spouse test that resource deeming uses rather than by tax-unit head and spouse roles, for joint claims, combined couple income and resources, and income deeming from an ineligible spouse (416.1801(c), 416.1806, 416.1160(d)). State supplement couple rates, income, resources, care categories and spouse allowances now use only the actual spouses when a situation omits marital units and includes a third adult. Colorado OAP and AND-CS retain declared spouses living apart; Missouri retains their combined resources for medical separation, Virginia and South Dakota retain joint care-entry budgets, and Oregon retains the community-care spouse payment across facilities. Iowa pools only the identified spouses across its state supplement paths, retains its prior-SSI residential-care entry budget across facilities, and requires an explicit shared-room input for the same-month entry rule without prior SSI.
+Retained state spouse budgets now reject explicit parent links and tax-dependent pairs across households. Missouri's non-MAGI Medicaid spouse deeming, California's non-MAGI premium deduction, the medically needy and Section 209(b) spend-down budgets, California CAPI and the California state supplement, Montana LIHEAP's SSI categorical coverage and SSI standards, California's Working Disabled Program income test, the Healthier Mississippi Waiver income test and Minnesota Supplemental Aid's couple income, resource and living-alone tests use only the identified spouses when marital units are omitted. Regressions pin claimant-wage deeming continuity and the 2026 wage/self-employment cases.
+
+We value in-kind support at the individual presumed maximum value when computing the no-deeming comparison, and retain the claimant's income exclusions.

policyengine_us/tests/core/test_calculate_chunked_validation.py

@@ -689,6 +689,8 @@ def test_rejects_flat_and_periodless_array_files(tmp_path, dataset):
     # Tests whether the simulation holds one marital unit. calculate_chunked
     # rejects a chunk holding exactly one of several marital units.
     "gov/ssa/ssi/eligibility/resources/deemed/_ssi_spouses.py": "chunk guard",
+    # The state retained-pair test makes the same one-marital-unit test.
+    "gov/states/_spouses.py": "chunk guard",
 }
 _POPULATION_SIGNAL = re.compile(
     r"MicroSeries|[\"'](?:"