2025 AMT Calculator for ISO Exercises

Exercising ISOs can trigger AMT, but only past a certain income threshold, and the math isn't obvious until you run it. This calculator uses the actual 2025 IRS brackets and AMT exemption/phaseout rules to estimate what you'll owe, before you exercise.

What you get:

• An instant AMT estimate based on your income, filing status, FMV, strike price, and ISOs exercised

• The real 2025 IRS progressive tax brackets and AMT exemption/phaseout rules built in

• A full calculation breakdown i.e exemption phaseout, amount subject to AMT, tentative AMT vs. regular tax