Alternative Minimum Tax Calculator

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

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

Our Alternative Minimum Tax (AMT) Calculator helps you determine if you'll owe additional taxes under the AMT system and estimate your potential liability for 2026. This is crucial because the AMT can significantly increase your tax burden, even for taxpayers with moderate incomes, by disallowing many common deductions and credits.

The calculator works by first determining your Tentative Minimum Tax (TMT), which is your Alternative Minimum Taxable Income (AMTI) minus your AMT exemption, multiplied by the AMT rates (26% on the first $220,700 and 28% on amounts above that). Your AMT liability is then the excess of your TMT over your regular income tax liability.

A common mistake is assuming you're exempt from AMT simply because your income isn't 'high.' Certain deductions, like state and local taxes or incentive stock option exercises, can trigger AMT even for middle-income earners. Always review your tax situation carefully, especially if you have significant itemized deductions or capital gains.

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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