What Happens to Your Stock Options When You Leave

The Clock Starts Ticking

When you leave a company — whether you quit, get laid off, or are terminated — your stock options don't just disappear immediately. But the clock starts ticking. Most companies give you a post-termination exercise period (PTEP), and if you don't exercise within that window, your vested options expire worthless.

Understanding this timeline is critical because the decisions you make in those first few weeks after leaving can have a six-figure impact on your financial future.

The 90-Day Exercise Window

The most common PTEP is 90 days. This means you have exactly 90 calendar days from your last day of employment to decide whether to exercise your vested stock options. After that, they're gone — regardless of how many years you spent vesting them.

Here's what makes this particularly challenging:

• You need to come up with the exercise cost (number of shares x strike price)
• You may owe significant taxes at exercise (AMT for ISOs, ordinary income for NSOs)
• You're making this decision while potentially unemployed or transitioning to a new role
• The company is still private, so there's no liquid market for the shares

Some companies have extended their PTEP to 1 year, 5 years, or even 10 years post-termination. Companies like Pinterest, Coinbase, and Asana were early adopters of extended exercise windows. Check your stock option agreement carefully — the PTEP is specified there.

ISO vs NSO: Different Rules Apply

Your option type changes what happens when you leave:

Incentive Stock Options (ISOs):

• Must be exercised within 90 days to retain ISO tax treatment
• After 90 days, ISOs convert to NSOs (losing the preferential tax treatment)
• Some companies allow you to exercise after 90 days, but as NSOs
• The ISO-to-NSO conversion means you'll owe ordinary income tax instead of just AMT

Non-Qualified Stock Options (NSOs):

• Follow whatever PTEP is in your agreement (commonly 90 days)
• Tax treatment doesn't change based on when you exercise within the window
• You'll owe ordinary income tax and FICA on the spread at exercise regardless

What You Need to Decide

When facing a stock option exercise decision, consider these factors:

1. Exercise Cost

Calculate the total cash needed: number of shares multiplied by the strike price, plus estimated taxes. Use our calculator to get the exact number.

2. Company Outlook

Consider the company's trajectory. Is it growing? Heading toward an IPO or acquisition? Or struggling? Remember, if the company fails, your exercised shares could be worth nothing — and you won't get your exercise cost or tax payments back.

3. Your Financial Situation

Can you afford to exercise? This includes not just the exercise cost but also the tax burden. For ISOs, AMT can be substantial. For NSOs, you'll owe ordinary income tax on the spread.

4. Financing Options

If you can't afford to exercise out of pocket, stock option financing can help. Non-recourse financing means you only pay back if the company succeeds — if the stock becomes worthless, you owe nothing.

Common Mistakes to Avoid

Waiting until the last minute. Don't wait until day 89 to start thinking about this. The exercise process can take time, and you need to plan for the tax implications.

Forgetting about taxes. The exercise cost is only part of the equation. AMT (for ISOs) or ordinary income tax (for NSOs) can double or triple the cash you need.

Exercising everything or nothing. You can exercise a portion of your vested shares. Consider exercising just the amount you can afford and are comfortable with.

Not considering your 83(b) election. If you're doing an early exercise of unvested shares, you have 30 days to file an 83(b) election with the IRS. Missing this deadline can have severe tax consequences.

Next Steps

The most important thing you can do right now is understand your numbers. Use our free stock option tax calculator to see exactly what exercising would cost you — exercise price, taxes, and total cash needed. Then you can make an informed decision about whether to exercise, how many shares to exercise, and whether financing makes sense.