Alternative Minimum Tax (AMT)

A parallel tax calculation that adds back certain preferences; you pay the higher.

What is Alternative Minimum Tax (AMT)?

Taxpayers compute tax under the regular rules and under AMT rules, which disallow or add back certain items, and pay whichever is higher. Preference items include the spread on exercising incentive stock options and interest on certain private activity municipal bonds.

Alternative Minimum Tax (AMT): a worked example

Exercising a large block of ISOs can trigger AMT even though no regular income tax is due.

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