What is the formula for ISO (Incentive Stock Option)?

ISO (Incentive Stock Option) does not have a single closed-form formula; the definition above explains the mechanics.

Can you give an example of ISO (Incentive Stock Option)?

See the definition above for typical use cases of ISO (Incentive Stock Option) in personal finance.

When does ISO (Incentive Stock Option) apply?

ISO (Incentive Stock Option) is used when working through tax decisions. The definition above describes the typical context.

What category does ISO (Incentive Stock Option) fall under?

ISO (Incentive Stock Option) is part of the tax category in the CalcFi glossary.

Which calculators use ISO (Incentive Stock Option)?

Related calculators on CalcFi: Stock Options & RSU Calculator.

Where does the ISO (Incentive Stock Option) definition come from?

Definitions in the CalcFi glossary are written by the CalcFi editorial team and cross-checked against IRS, Federal Reserve, BLS, and Investopedia conventions.

Is ISO (Incentive Stock Option) the same as related terms?

ISO (Incentive Stock Option) is closely related to other tax concepts. See the Related Terms section on this page for direct comparisons.

Does this glossary entry replace professional advice?

No. The CalcFi glossary is educational reference material. It is not personalized tax, legal, or investment advice. For decisions with material consequences, consult a licensed professional.

Definition

ISO (Incentive Stock Option)

A tax-advantaged employee stock option that can qualify for long-term capital gains treatment if holding rules are met.

Written by Jere SalmistoReviewed by CalcFi EditorialLast verified: 2026-05-13

What Is ISO (Incentive Stock Option)?

Incentive Stock Options give employees the right to buy company shares at a fixed strike price. If you hold the shares more than two years from grant and one year from exercise, the gain is taxed at long-term capital gains rates. Exercising ISOs can also trigger the Alternative Minimum Tax (AMT).

Related Terms

Employee Stock Option

The right to purchase company stock at a predetermined price within a specified time.

RSU (Restricted Stock Unit)

Company shares granted to an employee that vest over time and are taxed as ordinary income when they vest.

ESPP (Employee Stock Purchase Plan)

A workplace plan that lets you buy company stock at a discount (often 15%) through after-tax payroll deductions.

Related Calculators

Stock Options & RSU Calculator→

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