Tax glossary

Alternative Minimum Tax (AMT)

Alternative Minimum Tax — what it means, how it works, and a real example, explained without the jargon.

What is Alternative Minimum Tax (AMT)?

The AMT is a parallel tax system that ensures higher-income taxpayers pay a minimum amount, by disallowing certain deductions.

How it works

You calculate your tax the normal way and again under AMT rules — which add back items like large state-tax deductions and certain stock-option gains — then pay whichever is higher. An AMT exemption shields most middle-income filers from it entirely.

A quick example

Exercising incentive stock options can create a big "paper" gain under AMT rules, pushing you into AMT even though you haven't sold the shares or received cash.

What people get wrong

The classic AMT trap is exercising ISOs and holding the shares. If you're doing that, model the AMT hit before year-end — the tax can come due on gains you haven't actually pocketed.

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Frequently asked questions

What does Alternative Minimum Tax mean?

The AMT is a parallel tax system that ensures higher-income taxpayers pay a minimum amount, by disallowing certain deductions.

How does Alternative Minimum Tax work?

You calculate your tax the normal way and again under AMT rules — which add back items like large state-tax deductions and certain stock-option gains — then pay whichever is higher. An AMT exemption shields most middle-income filers from it entirely.

What's the most common mistake with alternative minimum tax?

The classic AMT trap is exercising ISOs and holding the shares. If you're doing that, model the AMT hit before year-end — the tax can come due on gains you haven't actually pocketed.