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Alternative minimum tax (AMT)

A parallel tax calculation that limits certain deductions and exclusions. Exercising incentive stock options is the most common way individuals trigger it.

What is Alternative minimum tax?

A parallel tax calculation that limits certain deductions and exclusions. Exercising incentive stock options is the most common way individuals trigger it.

Why it matters on your return

AMT recalculates your tax without certain deductions and adds back preference items, most commonly the bargain element on incentive stock options exercised and held. If the AMT result is higher than regular tax, you pay the difference, and you may get a credit back in later years.

Example

You exercise 5,000 ISOs at a $2 strike when shares are worth $22. Nothing hits your regular taxable income, but $100,000 of spread enters the AMT calculation and can produce a five-figure bill in April even though you sold nothing.

Can I avoid AMT by selling the shares the same year?

A same-year sale makes the exercise a disqualifying disposition, which converts the spread to ordinary income instead of an AMT preference. That can be better or worse depending on your bracket; it is a planning decision, not a rule.

Last reviewed September 10, 2026. Tax rules change; confirm current law before acting.

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