2026 AMT Calculator for ISO Exercises

2026 AMT phaseout thresholds dropped and the phaseout rate doubled the same ISO exercise that was safe in 2025 could trigger real AMT this year. This calculator uses the actual 2026 IRS brackets and 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 2026 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