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How to use the ISO exercise / AMT estimate

A short guide to our ISO AMT calculator: what it estimates, what it cannot, and what to gather first.

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The short answer

This page explains what to gather before estimating the tax impact of exercising : your strike price, current value, share count, and rough income picture. An estimate can show whether an exercise might create , but it cannot replace tax software or a professional for your actual return.

Why this happens

exercises do not usually create regular income tax, so the main question is whether the spread triggers .

depends on your whole return, not just the exercise, so any standalone estimate is a starting point.

Knowing the spread (value minus strike) and your share count is the first input to any estimate.

Private-company valuations add uncertainty, since the 'value' may come from a 409A appraisal rather than a market price.

What to check

  • Your exercise (strike) price and the current .
  • Number of shares you plan to exercise.
  • Your approximate other income and filing status for the year.
  • Whether you have cash to cover a possible bill.
  • Whether you also hold , which are taxed differently.

Common mistake

Treating an estimate as a filing position. This is an estimate, not tax advice. interacts with your full return, credits, and other preference items in ways a quick model cannot fully capture.

Example scenario (hypothetical)

Illustration only, not your tax situation.

Simplified and hypothetical: Robin plans to exercise 2,000 with a $5 strike at a $25 value. a $40,000 spread. Modeling that spread against Robin's other income gives a rough sense of whether might apply, so Robin can decide how many shares to exercise and when.

When to ask a CPA or tax advisor

  • An estimate suggests could be significant.
  • You are deciding how many shares to exercise this year.
  • Your company is private with an uncertain valuation.
  • You have both and to coordinate.

Related calculators

Related pages

Educational only

This guide is for learning and planning, not tax, legal, or investment advice. Your employer, state, grant terms, and filing status can change the outcome. Confirm details with your own documents and a qualified tax professional before making decisions.