{
  "version": "2026.1",
  "generated_by": "scripts/gen_muni_torpedo_study.mjs — every figure computed through the shared 2026 calc engine (federal-tax-2026.js ssTaxableAmount/provisionalIncome/ordinaryTax, irmaa.js annualSurcharge, aca-subsidy.js subsidy), the same parity-tested functions behind the live /tax-torpedo/, /irmaa-brackets-2026/ and ACA pages; 7 sanity-gate families + 3 mutation runs + 15 live-page assertions green at generation time",
  "source": "IRC §86(b)(2)(B) (tax-exempt interest in provisional income), IRS Pub 915 Worksheet 1 line 4; 42 U.S.C. §1395r(i)(4)(A)(ii) (tax-exempt interest in IRMAA MAGI); 26 CFR §1.36B-1(e)(2) (tax-exempt interest and untaxed SS in ACA MAGI); 2026 brackets, deductions, IRMAA tiers and FPL from QuantCalc's shared calc modules",
  "law_basis": "§86(c) thresholds are not indexed; 2026 IRMAA tiers apply to MAGI from two years prior; ACA figures use the 2026 current-law applicable-percentage schedule with the 400% FPL cliff",
  "generated_at": "2026-08-13T07:43:37.268Z",
  "row_count": 984,
  "grid": {
    "filings": [
      "single",
      "mfj"
    ],
    "ss_benefits": [
      24000,
      36000,
      48000
    ],
    "other_ordinary": {
      "from": 0,
      "to": 100000,
      "step": 2500
    },
    "muni_interest_levels": [
      0,
      10000,
      25000,
      50000
    ],
    "marginal_delta_dollars": 1,
    "deductions": "standard deduction only (same convention as the live /tax-torpedo/ calculator)",
    "irmaa_column": "annualSurcharge(MAGI, filing, 67) — per enrolled person, two-year lookback"
  },
  "fields": [
    "filing",
    "ss_benefit",
    "other_ordinary",
    "muni_interest",
    "provisional_income",
    "ss_taxable",
    "ss_taxable_pct",
    "agi",
    "taxable_income",
    "federal_tax",
    "bracket_rate",
    "muni_marginal_rate",
    "taxable_interest_marginal_rate",
    "phase",
    "irmaa_magi",
    "irmaa_annual_surcharge_per_person"
  ],
  "rows": [
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      "filing": "mfj",
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    {
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      "irmaa_magi": 165800,
      "irmaa_annual_surcharge_per_person": 0
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    {
      "filing": "mfj",
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      "phase": "capped",
      "irmaa_magi": 190800,
      "irmaa_annual_surcharge_per_person": 0
    }
  ],
  "torpedo_windows": [
    {
      "filing": "single",
      "ss_benefit": 24000,
      "other_income_phase50_starts": 13000,
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      "provisional_phase50": 25000,
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    },
    {
      "filing": "single",
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    {
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      "provisional_ceiling": 76705.88
    },
    {
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      "provisional_phase50": 32000,
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      "provisional_ceiling": 84941.18
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  ],
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    {
      "filing": "single",
      "tier": 1,
      "magi_floor": 109000,
      "annual_surcharge_below": 0,
      "annual_surcharge_above": 1148.4,
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    },
    {
      "filing": "single",
      "tier": 2,
      "magi_floor": 137000,
      "annual_surcharge_below": 1148.4,
      "annual_surcharge_above": 2884.8,
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    },
    {
      "filing": "single",
      "tier": 3,
      "magi_floor": 171000,
      "annual_surcharge_below": 2884.8,
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      "annual_jump_per_person": 1735.2
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    {
      "filing": "single",
      "tier": 4,
      "magi_floor": 205000,
      "annual_surcharge_below": 4620,
      "annual_surcharge_above": 6355.2,
      "annual_jump_per_person": 1735.2
    },
    {
      "filing": "single",
      "tier": 5,
      "magi_floor": 500000,
      "annual_surcharge_below": 6355.2,
      "annual_surcharge_above": 6936,
      "annual_jump_per_person": 580.8
    },
    {
      "filing": "mfj",
      "tier": 1,
      "magi_floor": 218000,
      "annual_surcharge_below": 0,
      "annual_surcharge_above": 1148.4,
      "annual_jump_per_person": 1148.4
    },
    {
      "filing": "mfj",
      "tier": 2,
      "magi_floor": 274000,
      "annual_surcharge_below": 1148.4,
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    {
      "filing": "mfj",
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      "magi_floor": 342000,
      "annual_surcharge_below": 2884.8,
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      "annual_jump_per_person": 1735.2
    },
    {
      "filing": "mfj",
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      "magi_floor": 410000,
      "annual_surcharge_below": 4620,
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    },
    {
      "filing": "mfj",
      "tier": 5,
      "magi_floor": 750000,
      "annual_surcharge_below": 6355.2,
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      "annual_jump_per_person": 580.8
    }
  ],
  "aca_slice": {
    "scenario": {
      "ss": 24000,
      "other": 30000,
      "age": 63,
      "state": "FL",
      "hh": 1
    },
    "note": "single filer, household of 1; ACA MAGI = other income + FULL Social Security benefit + muni interest (26 CFR §1.36B-1(e)(2))",
    "rows": [
      {
        "muni_interest": 0,
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        "fpl_pct": 345,
        "annual_subsidy": 13553.21
      },
      {
        "muni_interest": 1000,
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        "fpl_pct": 351.4,
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      },
      {
        "muni_interest": 2000,
        "aca_magi": 56000,
        "fpl_pct": 357.8,
        "annual_subsidy": 13354.01
      },
      {
        "muni_interest": 3000,
        "aca_magi": 57000,
        "fpl_pct": 364.2,
        "annual_subsidy": 13254.41
      },
      {
        "muni_interest": 4000,
        "aca_magi": 58000,
        "fpl_pct": 370.6,
        "annual_subsidy": 13154.81
      },
      {
        "muni_interest": 5000,
        "aca_magi": 59000,
        "fpl_pct": 377,
        "annual_subsidy": 13055.21
      },
      {
        "muni_interest": 6000,
        "aca_magi": 60000,
        "fpl_pct": 383.4,
        "annual_subsidy": 12955.61
      },
      {
        "muni_interest": 7000,
        "aca_magi": 61000,
        "fpl_pct": 389.8,
        "annual_subsidy": 12856.01
      },
      {
        "muni_interest": 8000,
        "aca_magi": 62000,
        "fpl_pct": 396.2,
        "annual_subsidy": 12756.41
      },
      {
        "muni_interest": 9000,
        "aca_magi": 63000,
        "fpl_pct": 402.6,
        "annual_subsidy": 0
      },
      {
        "muni_interest": 10000,
        "aca_magi": 64000,
        "fpl_pct": 408.9,
        "annual_subsidy": 0
      },
      {
        "muni_interest": 11000,
        "aca_magi": 65000,
        "fpl_pct": 415.3,
        "annual_subsidy": 0
      },
      {
        "muni_interest": 12000,
        "aca_magi": 66000,
        "fpl_pct": 421.7,
        "annual_subsidy": 0
      }
    ]
  },
  "related": [
    {
      "title": "Tax Torpedo Calculator",
      "url": "https://quantcalc.app/tax-torpedo/"
    },
    {
      "title": "IRMAA Brackets 2026",
      "url": "https://quantcalc.app/irmaa-brackets-2026/"
    },
    {
      "title": "RMDs and IRMAA",
      "url": "https://quantcalc.app/rmd-irmaa/"
    },
    {
      "title": "ACA Federal Poverty Level Thresholds 2026",
      "url": "https://quantcalc.app/data/aca-fpl-2026/"
    }
  ]
}
