{
  "id": "amt",
  "version": "5e0980863f9a",
  "status": "published",
  "name": "AMT Calculator",
  "question": "How much AMT will I owe?",
  "summary": "Estimates the 2026 alternative minimum tax: AMT income, the exemption and its phase-out, the 26% and 28% tentative minimum tax, and the AMT owed over the regular tax, with incentive stock options.",
  "category": "finance",
  "subcategory": "tax-and-pay",
  "url": "https://www.acalculator.org/finance/amt-calculator",
  "markdown": "https://www.acalculator.org/finance/amt-calculator.md",
  "kind": "function",
  "method": "AMTI = AGI − other itemized deductions (when you itemize; the standard deduction and state and local taxes are not allowed) + ISO spread + other adjustments. Exemption = $90,100 single or head of household, $140,200 jointly, less 50% of AMTI over $500,000 ($1,000,000 jointly), not below 0. Base = AMTI − exemption. Tentative minimum tax = 26% × base, or 28% × base − $4,890 above $244,500. AMT = tentative minimum tax − regular tax, if positive.",
  "assumptions": [
    "An estimate for tax year 2026 (IRS Rev. Proc. 2025-32 and Form 6251), not tax advice.",
    "All income is ordinary income: qualified dividends and long-term gains, which keep their 0%, 15%, and 20% rates under AMT, are not included. No credits, no AMT foreign tax credit, no minimum tax credit from earlier years.",
    "Married filing separately is not covered: its phase-out has an extra AMTI add-on.",
    "Other itemized deductions are within their own limits. The regular tax takes the larger of the standard deduction and the itemized deductions: state and local taxes up to the 2026 limit ($40,400, less 30% of AGI over $505,000, not below $10,000) plus the others, less the IRC 68 cut above the 37% bracket."
  ],
  "inputs": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "status": {
        "title": "Filing status",
        "description": "Your federal filing status. Married filing separately is not covered.",
        "type": "string",
        "enum": [
          "single",
          "hoh",
          "mfj",
          "qss"
        ]
      },
      "income": {
        "title": "Income (AGI)",
        "description": "Your adjusted gross income for the year (Form 1040 line 11).",
        "type": "number",
        "x-unit": "USD",
        "minimum": 0,
        "maximum": 10000000000
      },
      "salt": {
        "title": "State and local taxes deducted",
        "description": "The state and local income, sales, and property taxes you paid; the 2026 limit is applied for you.",
        "type": "number",
        "x-unit": "USD",
        "minimum": 0,
        "maximum": 10000000000
      },
      "item": {
        "title": "Other itemized deductions",
        "description": "Mortgage interest, gifts to charity, and medical costs over 7.5% of AGI.",
        "type": "number",
        "x-unit": "USD",
        "minimum": 0,
        "maximum": 10000000000
      },
      "iso": {
        "title": "Incentive stock option spread",
        "description": "For ISOs you exercised and kept at year end: (value at exercise − price paid) × shares.",
        "type": "number",
        "x-unit": "USD",
        "minimum": 0,
        "maximum": 10000000000
      },
      "adj": {
        "title": "Other AMT adjustments",
        "description": "Tax-exempt interest from private activity bonds and other Form 6251 adjustments, as a positive number.",
        "type": "number",
        "x-unit": "USD",
        "minimum": 0,
        "maximum": 10000000000
      }
    }
  },
  "outputs": {
    "amt": {
      "label": "Alternative minimum tax",
      "description": "Form 6251 line 11: tentative minimum tax over the regular tax, or 0.",
      "format": "money"
    },
    "tmt": {
      "label": "Tentative minimum tax",
      "description": "26% and 28% of the AMT base.",
      "format": "money"
    },
    "regular": {
      "label": "Regular income tax",
      "description": "Form 1040 line 16 tax, with the larger of the standard and itemized deduction.",
      "format": "money"
    },
    "total": {
      "label": "Total income tax",
      "description": "Regular tax plus AMT.",
      "format": "money"
    },
    "amti": {
      "label": "AMT income (AMTI)",
      "description": "Taxable income with the AMT add-backs and adjustments.",
      "format": "money"
    },
    "exemption": {
      "label": "AMT exemption",
      "description": "The exemption after the 50% phase-out over the threshold.",
      "format": "money"
    },
    "base": {
      "label": "AMT base",
      "description": "AMTI minus the exemption.",
      "format": "money"
    }
  },
  "defaultAnswer": {
    "inputs": {
      "status": "single",
      "income": 200000,
      "salt": 10000,
      "item": 5000,
      "iso": 100000,
      "adj": 0
    },
    "outputs": {
      "amt": 17840,
      "tmt": 54574,
      "regular": 36734,
      "total": 54574,
      "amti": 300000,
      "exemption": 90100,
      "base": 209900
    },
    "text": "With $300,000.00 of AMT income, your tentative minimum tax is $54,574.00 against $36,734.00 of regular tax, so you owe $17,840.00 of AMT."
  },
  "examples": [
    {
      "given": {
        "status": "single",
        "income": 150000,
        "salt": 10000,
        "item": 5000,
        "iso": 0,
        "adj": 0
      },
      "expect": {
        "amti": 150000,
        "exemption": 90100,
        "tmt": 15574,
        "regular": 24734,
        "amt": 0
      },
      "source": "Rev. Proc. 2025-32 AMT exemption $90,100; Form 6251: standard deduction added back; 26% × 59,900; Python 3 check in docs/progress/WP-112/check.py"
    },
    {
      "given": {
        "status": "single",
        "income": 200000,
        "salt": 10000,
        "item": 5000,
        "iso": 150000,
        "adj": 0
      },
      "expect": {
        "amti": 350000,
        "tmt": 67882,
        "regular": 36734,
        "amt": 31148
      },
      "source": "Form 6251 line 7: 28% × 259,900 − 4,890 (2% of $244,500); regular tax on $183,900; hand calculation in content.mdx; Python 3 check in docs/progress/WP-112/check.py"
    },
    {
      "given": {
        "status": "mfj",
        "income": 600000,
        "salt": 40000,
        "item": 30000,
        "iso": 500000,
        "adj": 0
      },
      "expect": {
        "amti": 1070000,
        "exemption": 105200,
        "tmt": 265254,
        "regular": 132873.5,
        "amt": 132380.5
      },
      "source": "Rev. Proc. 2025-32: $140,200 less 50% of AMTI over $1,000,000; SALT limited to $11,900 (IRC 164(b)(7)) and added back (Form 6251 line 2a); Python 3 check in docs/progress/WP-112/check.py"
    },
    {
      "given": {
        "status": "single",
        "income": 700000,
        "salt": 0,
        "item": 0,
        "iso": 0,
        "adj": 0
      },
      "expect": {
        "exemption": 0,
        "amti": 700000
      },
      "source": "Rev. Proc. 2025-32: the single exemption is fully phased out at $680,200 of AMTI"
    }
  ],
  "sources": [
    "IRS, Rev. Proc. 2025-32 (Internal Revenue Bulletin 2025-45), section 4: Exemption Amounts for Alternative Minimum Tax, rate tables, and standard deduction. https://www.irs.gov/irb/2025-45_IRB (retrieved 2026-10-05)",
    "IRS, Instructions for Form 6251, Alternative Minimum Tax, Individuals. https://www.irs.gov/instructions/i6251 (retrieved 2026-10-05)",
    "IRS, Topic no. 556, Alternative minimum tax. https://www.irs.gov/taxtopics/tc556 (retrieved 2026-10-05)"
  ],
  "related": [
    "income-tax",
    "tax-bracket",
    "taxable-income",
    "capital-gains-tax"
  ],
  "changelog": []
}