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NSO Exercise Tax Calculator

NSO exercises usually create W-2 wage income at exercise. estimate taxes and withholding before you exercise.

Rates and rules change. Check the tax year and last-reviewed date on each page, then confirm against IRS or state guidance before you file.

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Exercising usually creates ordinary wage income equal to the spread between value and strike, reported on your with , even if you do not sell. The key planning question is whether you have cash to cover the tax if you exercise and hold.

Planning estimate

Educational estimate only. NSO taxation depends on your full income, payroll taxes, and state rules. This models the spread and flat withholding, not your complete return.

We do not pre-fill personal financial values. Estimates appear only after you enter your own numbers.

Enter your details to estimate

Add your equity, income, state, and withholding details to see an educational estimate. No personal financial values are pre-filled.

Start with the fields below.

Your details

Enter your own numbers below. This is an estimate, not a filing position.

Calculators pull rates from our tax-year files. For the most complete defaults, use 2025. Unloaded years ask you to enter rates yourself.

Required to estimate

What you pay to exercise each option.

$

Required to estimate

Fair market value when you exercise.

$

Required to estimate

Enter your state supplemental rate if known.

%

Enter your top bracket to estimate the gap versus flat withholding.

%

Results will appear here once you enter the required details on the left.

Related guides

Why this happens

spreads are treated as compensation, not , at exercise.

Because it is wage income, employers generally tax at exercise.

Exercising and holding means tax now with no sale proceeds to pay it.

may use a flat supplemental rate that trails your .

What to check

  • The spread at exercise: value minus strike, times shares.
  • How is collected on the exercise.
  • Whether you have cash to cover tax if you hold.
  • Whether the flat rate matches your bracket.
  • Your basis for a future sale (generally the exercise value).

Common mistake

Exercising and holding without reserving cash: The tax event and the cash event are not the same thing, you can owe tax at exercise with no shares sold.

Example scenario (hypothetical)

Illustration only, not your tax situation.

Example: exercising 1,000 at a $4 strike when the value is $20 creates a $16,000 ordinary-income spread, with , even if no shares are sold.

When to get help from a tax pro

  • You plan to exercise and hold.
  • The spread is large relative to your cash.
  • You exercised in one state and may sell in another.
  • You have both and this year.

Related calculators

Related pages

For learning, not filing

Grants, employers, and states all differ. Use your own documents and a qualified tax professional before you make decisions from this guide.