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Maine STFC 2025 base amount is $220; the 2025 Schedule PTFC/STFC table shows $215 for joint/HoH filers with no dependents #8928

Description

@DTrim99

Bug

The 2025 Schedule PTFC/STFC line 17 tables give, for the lowest income band:

Filing status 0 deps 1 dep 2+ deps
Married filing jointly / QSS (income ≤ $50,950) 215 250 280
Head of household (income ≤ $38,200), columns 0–1 / 2 / 3+ 215 250 280
Single (income ≤ $25,450) 155

PolicyEngine's 2025 values in gov/states/me/tax/income/credits/fairness/sales_tax/:

  • amount/base.yaml: JOINT / HEAD_OF_HOUSEHOLD / SURVIVING_SPOUSE = $220 (single $155 is correct)
  • amount/additional/{joint,head_of_household}.yaml: dependent add-ons still at their 2024 values, $30 / $60 (no uprating block)

So PolicyEngine matches the form for filers with dependents ($220 + 30 = 250, $220 + 60 = 280) but overstates the credit by $5 for filers with none. The form decomposes as base $215 with add-ons $35 / $65 (§5213-A amounts are all inflation-adjusted under §5403(5)).

The $220 came in via #8266 (fixing #8262); its integration test used the 2+-dependents column ($52,630 → $240), which is insensitive to the base/add-on split, so the error passed. The phase-out starts added there ($25,450 / $38,200 / $50,950) do match the form.

Reproduction

2025, ME, MFJ, ages 23/24, no dependents, $10,476 wages: me_sales_tax_fairness_credit = 220.00; the form table (and the TaxAct return in PolicyEngine/policyengine-taxsim#1056) gives $215.

Fix

Set the 2025 joint/HoH/surviving-spouse base to $215 and the 2025 dependent add-ons to $35/$65, and add a 0-dependent integration test so the base is pinned independently of the add-ons.

Found while diagnosing PolicyEngine/policyengine-taxsim#1056. cc @PavelMakarchuk

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