ISO/NSO 90-day exercise window

Most equity plans give you 90 days post-termination to exercise vested stock options. Runs concurrent with grace period.

Vested ISOs (Incentive Stock Options) and NSOs (Non-qualified Stock Options) typically have a 90-day post-termination exercise window per the company's equity plan. If you depart the US, the IRS clock keeps running — exercise BEFORE you become NRA-for-tax-purposes (substantial-presence-test cutoff). Some equity plans allow extending the window to 12 months in exchange for converting ISOs to NSOs. Read your grant agreement.

Related terms

RSU acceleration
Severance-package term that vests some or all of your unvested RSUs at termination.
Substantial Presence Test (SPT)
IRS Pub 519 test that determines whether you're a US tax resident or non-resident alien for the year.

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This is an information-only tool, not legal advice. You are responsible for your decisions. When in doubt, consult an immigration attorney.