AMT Calculator
Check whether you owe Alternative Minimum Tax on top of your regular federal tax.
AMTI adds back certain deductions and preference items to regular taxable income — a full AMT calculation (Form 6251) has more adjustments than this simplified version covers.
About the AMT Calculator
The AMT Calculator gives you an instant answer from just a few inputs — filing status, alternative minimum taxable income (amti), regular federal tax liability. It runs entirely in your browser, so the numbers you enter stay private and never touch a server, and the result recalculates the moment you change a value. It's free to use with no sign-up, no limits, and nothing to install.
Worth Knowing
The Alternative Minimum Tax is a parallel tax system designed to stop high earners from using deductions to pay too little. You calculate your tax both the regular way and the AMT way, and pay whichever is higher. Post-2017 changes raised the exemption sharply, so far fewer people trigger it now than a decade ago. Certain items — large state-tax deductions, incentive stock options — are the usual triggers that pull someone into AMT territory.
How to Use
- Enter Filing status into the first field of the AMT Calculator.
- Fill in the rest: Alternative Minimum Taxable Income (AMTI), Regular federal tax liability.
- Your result appears instantly as you type — there's no submit button or page reload.
- AMTI adds back certain deductions and preference items to regular taxable income — a full AMT calculation (Form 6251) has more adjustments than this simplified version covers.