Quick Answer
You typically have 30-90 days to exercise vested stock options after leaving. Unexercised options expire worthless. The tax impact depends on option type: ISOs may trigger AMT, while NQSOs create immediate ordinary income. Most departing employees lose 60-80% of unvested options.
Best Answer
Robert Kim, CPA
Best for anyone leaving a company with stock options who needs to understand their choices
What happens to stock options when you leave?
When you leave your company, your stock options don't automatically disappear, but the clock starts ticking. Most companies give you 30-90 days to exercise any vested options before they expire worthless. This is called the "exercise window" or "post-termination exercise period."
Here's what typically happens:
Example: $150,000 salary employee with stock options
Sarah works at a tech company earning $150,000. She has:
If she exercises all vested options:
Tax implications by option type
Incentive Stock Options (ISOs):
Non-Qualified Stock Options (NQSOs):
Key factors affecting your decision
What you should do
1. Review your stock plan documents to confirm your exercise window
2. Calculate the total cost including taxes (not just the exercise price)
3. Consult a tax professional for complex situations involving AMT
4. Consider a cashless exercise if available to reduce upfront costs
5. Use our return scanner to identify other tax-saving opportunities during your job transition
Key takeaway: You typically have 30-90 days to exercise vested options after leaving, but the tax bill can be substantial — especially with ISOs that may trigger AMT on gains of $40,000+ per year.
*Sources: [IRS Publication 525](https://www.irs.gov/pub/irs-pdf/p525.pdf), [IRC Section 422](https://www.law.cornell.edu/uscode/text/26/422)*
Key Takeaway: Most departing employees have 30-90 days to exercise vested options, but should carefully calculate the total tax cost before exercising, especially with ISOs that may trigger AMT.
Tax treatment comparison for ISOs vs NQSOs when exercising after leaving company
| Option Type | Exercise Tax | AMT Risk | Capital Gains Treatment |
|---|---|---|---|
| ISO | No ordinary income | Yes, on bargain element | If held 1+ year after exercise |
| NQSO | Ordinary income on spread | No | On gains above exercise price |
More Perspectives
Diana Flores, EA
Best for employees who changed jobs and moved to a different state
Multi-state complications with stock options
If you moved states when changing jobs, your stock option situation becomes more complex. You may owe taxes in multiple states, depending on when you exercise and where you lived when the options were granted versus exercised.
State tax considerations:
Example: California to Texas move
Mark worked in California (13.3% top rate) when granted ISOs, then moved to Texas (0% state income tax) before exercising. For ISOs, California may still claim tax on the portion that vested while he was a CA resident, even though he exercises in Texas.
Pro tip: Some states have "throwback rules" that can create unexpected tax bills. Always consult a tax professional familiar with multi-state stock option taxation before exercising after a move.
Key takeaway
Moving states during your stock option timeline can create complex tax situations requiring professional guidance to avoid overpaying or facing surprise tax bills.
Key Takeaway: Multi-state moves during stock option vesting can create complex tax obligations in both your former and current state.
Robert Kim, CPA
Best for early-career professionals with their first stock option grants
Stock options for first-time recipients
If this is your first job with stock options, the process can feel overwhelming. Here's what early-career professionals need to know:
Start with the basics:
Should you exercise as an entry-level employee?
Many early-career professionals can't afford to exercise options when leaving. Consider these factors:
Example calculation:
500 vested options at $5 strike price, current value $15/share
For someone earning $65,000, this represents 6-7% of gross annual salary — a significant investment in one company.
Key takeaway
Early-career professionals should focus on cash flow and career development over stock options, unless the exercise cost is minimal relative to income.
Key Takeaway: Entry-level employees should prioritize cash flow and career growth over stock options unless the exercise cost is small relative to their income.
Sources
- IRS Publication 525 — Taxable and Nontaxable Income
- IRC Section 422 — Incentive Stock Options
Related Questions
Reviewed by Robert Kim, CPA on February 28, 2026
This content is for educational purposes only and is not a substitute for professional tax advice. Consult a qualified tax professional for advice specific to your situation.