Alternative Minimum Tax Calculator

Look up AMT exemption amounts and estimate alternative minimum tax liability.

By Konstantin Iakovlev · Updated April 2026 · Source: IRS — Forms, Instructions & Publications

$

Tentative Min Tax

$54,574.00

Additional AMT

$0.00

AMT Calculation

Exemption$90,100.00
AMT Base$209,900.00
Tentative Minimum Tax$54,574.00
Additional AMT Owed$0.00

Use the Alternative Minimum Tax Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

The Alternative Minimum Tax (AMT) runs as a parallel tax system, and this tool estimates whether it applies to you and what you might owe for 2026. It matters because the AMT can push your tax bill well above the regular calculation, reaching taxpayers with moderate incomes by stripping out many of the deductions and credits people normally count on.

The math starts with your Tentative Minimum Tax (TMT): take your Alternative Minimum Taxable Income (AMTI), subtract your AMT exemption, and apply the AMT rates of 26% on the first $220,700 and 28% on anything beyond that. Your actual AMT liability is whatever amount your TMT exceeds your regular income tax liability.

Plenty of people assume the AMT can't touch them because their income doesn't feel 'high,' but that assumption is where the surprise comes from. Triggers like state and local tax deductions or exercising incentive stock options can pull middle-income filers into AMT territory. If you carry large itemized deductions or sizable capital gains, it's worth working through your full situation rather than guessing.

Example: Single Filer with High Itemized Deductions

  1. 1 Input: A single filer has an AMTI of $300,000 for 2026. Their regular tax liability is $45,000. The 2026 AMT exemption for single filers is $87,700.
  2. 2 Calculation: AMTI - Exemption = $300,000 - $87,700 = $212,300 (Taxable AMTI). TMT = ($212,300 * 0.26) = $55,198.
  3. 3 Intermediate Result: The Tentative Minimum Tax (TMT) is $55,198.
  4. 4 Final Result: AMT Liability = TMT - Regular Tax = $55,198 - $45,000 = $10,198. This taxpayer would owe an additional $10,198 in AMT.

Source: IRS — Forms, Instructions & Publications · Last updated: April 2026

Frequently Asked Questions

Who typically pays the alternative minimum tax?
AMT most commonly affects high-income taxpayers who have large deductions for state and local taxes, exercise incentive stock options, or claim certain tax preferences. The 2017 TCJA significantly reduced the number of AMT payers by raising the exemption.
How do I calculate my alternative minimum taxable income?
Start with regular taxable income, add back certain deductions (state/local taxes, certain interest, and tax preference items), then subtract the AMT exemption. Apply the AMT rate (26% or 28%) to the result and compare to your regular tax.
Can I get a credit for AMT paid in prior years?
Yes. If you paid AMT due to timing items like ISO exercises (deferral preferences), you may be eligible for the AMT credit in future years. The credit can offset regular tax in years when you do not owe AMT, using Form 8801.

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