ISO Exercise Calculator with AMT Implications

This calculator helps you understand the potential Alternative Minimum Tax (AMT) implications when exercising Incentive Stock Options (ISOs). My (updated) version of Erik Barbara's calc, which I recommend for a written explanation.

Input Parameters

Tax Year

Adjusted Gross Income

Number of ISOs to Exercise

Strike Price

Current 409A Fair Market Value

Filing Status

Here's an estimate of whether you'd owe AMT tax in 2026, and if so, how much.

Adjusted Gross Income$150,000

+ AMT Income Adjustment from Options Exercise$20,000

AMT Income$170,000

− AMT Exemption (Single)

$90,100

AMT Base$79,900

Alternative Minimum Tax

(26% of AMT base up to the threshold, 28% above it)

$20,774

Federal Ordinary Income Tax

$24,734

Payable Tax

(Greater of tentative minimum tax or ordinary income tax)

$24,734