ISO Exercise and AMT Calculator: What Will It Cost? | Falcon
Exercising incentive stock options can require cash for the exercise price and additional money for possible alternative minimum tax. The potential AMT generally depends on the difference between the exercise price and the shares’ fair market value, your income, filing status, deductions, credits, and other AMT items.
Enter your anticipated 2026 income and ISO exercise information.
The calculator uses these simplified calculations:
For federal AMT purposes, the difference between the exercise-date value and exercise price may be added to alternative minimum taxable income when ISO shares are exercised and retained. IRS Stock Options Guidance
For 2026:
Exercising ISOs does not generally create regular federal income when the options qualify for ISO treatment. However, the spread between the exercise price and exercise-date fair market value may create an AMT adjustment.
Whether additional AMT is actually owed depends on the complete tax return, including:
Not necessarily. A multi-year exercise strategy may reduce the possibility of creating a large AMT obligation in one year, but waiting also introduces risks involving:
The best exercise schedule depends on both the tax estimate and the role the shares play in the broader financial plan.
Falcon Wealth Planning considers four connected decisions:
Cash
How much money is required to exercise the options?
Taxes
Could the exercise create federal or state AMT?
Timing
Should the options be exercised now or over multiple tax years?
Portfolio risk
How much of your future wealth would depend on one company?
Falcon can model different exercise amounts and years while connecting the decision to cash flow, investments, retirement planning, and other financial goals.
This calculator may not include:
California taxpayers may also face a separate state AMT adjustment from exercising ISOs. This calculator estimates federal AMT only.
A qualifying ISO exercise generally does not create regular federal taxable income. However, the exercise may create an AMT adjustment based on the difference between the exercise price and fair market value.
Generally, no ISO AMT adjustment is required when the shares are disposed of during the same calendar year as exercise. However, the sale may be a disqualifying disposition and create ordinary compensation income.
Some ISO-related AMT may generate a minimum tax credit that can potentially be used in future years. The timing and amount available depend on future tax calculations and should not be treated as a guaranteed refund.
There is no universal number. It depends on income, filing status, deductions, credits, other AMT items, the exercise price, and the shares’ fair market value.
Educational estimate only. This calculator uses simplified federal tax assumptions and does not provide individualized tax, legal, or investment advice. Actual results may differ based on your income, deductions, credits, state residency, other AMT items, disposition timing, option terms, and changes in tax law. Consult qualified financial and tax professionals before exercising or selling shares.
Falcon Wealth Planning can help you compare exercise amounts, estimate potential AMT, evaluate company-stock concentration, and build an exercise strategy around your broader financial plan.
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