Time-Sensitive Decision Required
Most stock option grants give you only 90 days to exercise your vested options after your last day of employment. This deadline is non-negotiable. Mark your calendar and understand your options now.
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Understanding Your Equity Package
Before making any decisions, you need to fully understand what you have. Gather these documents from your company immediately:
- Stock Option Grant Agreement: Your original grant letter with strike price and vesting schedule
- Vesting Schedule: Confirmation of how many shares have vested
- 409A Valuation: The current fair market value (FMV) of common shares
- Cap Table Summary: Understanding your percentage ownership (if available)
- Exercise Window Terms: How long you have to exercise post-termination
- Any Extension Agreements: Some companies extend the exercise window
Key Terms Defined
| Term | What It Means |
|---|---|
| Strike Price | The price per share you pay to exercise (buy) your options |
| Fair Market Value (FMV) | Current value per share, as determined by 409A valuation |
| Spread | The difference between FMV and strike price (your "paper gain") |
| Vested Shares | Options you've earned the right to exercise |
| Unvested Shares | Options you haven't earned yet (typically lost when you leave) |
| Exercise | Using your options to buy shares at the strike price |
ISO vs. NSO: Critical Tax Differences
The type of stock options you have dramatically affects your tax situation. Most employees have Incentive Stock Options (ISOs), but Non-Qualified Stock Options (NSOs) are also common.
| Characteristic | ISOs (Incentive Stock Options) | NSOs (Non-Qualified) |
|---|---|---|
| Tax at Exercise | No regular income tax (but may trigger AMT) | Spread taxed as ordinary income immediately |
| Tax at Sale | Capital gains if you meet holding periods | Capital gains on any additional appreciation |
| Holding Period | 1 year after exercise + 2 years after grant for LTCG | 1 year after exercise for LTCG on additional gains |
| Post-Termination Window | 90 days to maintain ISO treatment | No specific limit (follows grant agreement) |
| $100K Rule | Max $100K worth of ISOs can vest per year | No limit |
The 90-Day ISO Rule
If you have ISOs and don't exercise within 90 days of termination, your ISOs automatically convert to NSOs. This means you lose the favorable tax treatment. The clock starts on your last day of employment, not when you receive notice of termination.
Your Post-Termination Exercise Window
Your post-termination exercise window is defined in your stock option agreement. Standard windows are:
Common Exercise Window Terms
- 90 days (standard): Most common for traditional grants
- 3-12 months: Some modern startups offer extended windows
- 5-10 years: Increasingly common at employee-friendly companies
- Until option expiration: Rare but becoming more common
Check Your Agreement Carefully
Don't assume you have 90 days. Some companies have shorter windows (30-60 days), while others have longer ones. Read your stock option agreement carefully or ask HR to confirm your specific deadline.
Calculating Your Exercise Cost
Understanding the true cost of exercise is crucial. It's not just the strike price—you need to account for taxes too.
Stock Option Exercise Calculator
Tax Implications of Exercise
The tax treatment depends on whether you have ISOs or NSOs, and when you sell the shares.
NSO Tax Treatment
- At Exercise: The spread (FMV - strike price) is taxed as ordinary income
- Your company withholds: Federal, state, Social Security, and Medicare taxes
- At Sale: Any gain above the FMV at exercise is capital gains
- Holding period: 1+ year for long-term capital gains rate
ISO Tax Treatment (Best Case)
- At Exercise: No regular income tax (but may trigger AMT)
- At Qualifying Sale: Entire gain taxed as long-term capital gains
- Requirements: Hold 1 year after exercise AND 2 years after grant date
2026 Tax Rates Reference
- Ordinary income: 10-37% federal + state income tax
- Long-term capital gains: 0%, 15%, or 20% federal + state
- AMT rate: 26-28% on AMT income
The AMT Trap: Avoid a Tax Nightmare
The Alternative Minimum Tax (AMT) is a parallel tax system that can create devastating tax bills for ISO holders. The AMT treats your ISO spread as income, even though you haven't sold the shares and can't access the money.
How the AMT Trap Works
- You exercise ISOs with a large spread (FMV much higher than strike price)
- The spread becomes "AMT preference income"
- If this pushes you into AMT, you owe taxes on the paper gain
- If the stock price drops, you still owe the AMT
- You may owe taxes on gains that no longer exist
Real-World Disaster Scenario
In 2000-2001, thousands of employees exercised ISOs during the dot-com boom, triggering AMT on massive paper gains. When stocks crashed, they owed hundreds of thousands in taxes on shares worth a fraction of that. Some faced bankruptcy. Don't let this happen to you.
AMT Avoidance Strategies
- Exercise and sell same day: No AMT risk, but no ISO benefit
- Limit exercise amount: Stay below AMT threshold (consult a tax pro)
- Exercise across calendar years: Spread AMT exposure over multiple years
- Exercise low-spread options only: Lower spread = lower AMT impact
- Calculate AMT before exercising: Use tax software or a CPA
Analyzing Company Valuation
Your equity is only worth something if the company succeeds and has a liquidity event (acquisition or IPO). Before exercising, honestly assess your company's prospects.
Questions to Ask
- What is the company's current runway (months of cash remaining)?
- Are they actively fundraising? At what valuation?
- Is revenue growing or declining?
- What is the liquidation preference stack?
- How much would the company need to sell for to give common shareholders value?
- Are there any acquisition discussions happening?
- What's the path to profitability or exit?
The Preference Stack Problem
VCs typically have liquidation preferences—they get paid before common shareholders in an exit. If the preference stack is high, common shares (your shares) may be worth nothing in many exit scenarios.
Example: Understanding Liquidation Preferences
Exercise Strategies by Scenario
Your exercise strategy should depend on your specific situation. Here are common scenarios and recommended approaches:
Strong Company, Low Cost
- Company is healthy with 18+ months runway
- Recent funding at high valuation
- Exercise cost is small relative to your savings
- Clear path to liquidity event
Strategy: Exercise all vested shares; consider tax timing
Uncertain Outlook, Moderate Cost
- Company has 12-18 months runway
- Exercise cost is meaningful but affordable
- Some concerns about future funding
- Preference stack is moderate
Strategy: Exercise low strike price options only; partial exercise
High Risk, High Cost
- Company struggling with <12 months runway
- Exercise cost would strain your finances
- High preference stack (2x+)
- No clear path to exit
Strategy: Let options expire; don't throw good money after bad
Strong Company, High AMT Risk
- Large ISO grant with big spread
- Exercising all would trigger significant AMT
- Company is doing well
- You can wait for better timing
Strategy: Negotiate extended exercise window; exercise strategically over years
Negotiating Extended Exercise Windows
One of the most valuable things you can negotiate in your exit package is an extended exercise window. This gives you more time to make the decision and potentially avoid AMT.
What to Ask For
- Extended window: 1-2 years instead of 90 days
- Full ISO period: 10 years from original grant (requires company cooperation)
- Conversion to NSO: If you want a longer window and are okay with NSO treatment
How to Negotiate
- Request the extension as part of your severance negotiation
- Explain that it costs the company nothing (no cash outlay)
- Emphasize your tenure and contributions
- Get it in writing as an amendment to your stock option agreement
- Have an attorney review the amendment before signing
Companies Are Increasingly Flexible
Many modern startups now offer extended exercise windows by default. If yours doesn't, they may be willing to make an exception. It costs them nothing financially—it's pure goodwill. Ask your manager or the CFO directly.
RSUs: How They're Different
If you have Restricted Stock Units (RSUs) instead of stock options, the rules are different—and generally simpler.
RSU vs. Stock Option Comparison
| Factor | Stock Options | RSUs |
|---|---|---|
| Exercise Required? | Yes—you must pay to buy shares | No—shares are granted automatically |
| Cost to You | Strike price × shares | $0 (taxes withheld from value) |
| Tax at Vesting | Generally none (ISOs) | Full value taxed as ordinary income |
| If Company Fails | You may lose exercise cost | You received value at vesting (taxed) |
| Post-Termination | Unvested expire; exercise window for vested | Unvested are canceled; you keep vested shares |
What Happens to RSUs When Laid Off
- Vested RSUs: You already own these shares—they're yours
- Unvested RSUs: Typically canceled upon termination
- Pending vesting: Some companies accelerate the next vest date
- Negotiation: Ask for acceleration of unvested RSUs as part of your exit package
The 83(b) Election Explained
An 83(b) election is a special IRS filing that lets you pay taxes on stock at grant rather than at vesting. It's only relevant if you have:
- Restricted stock (not options) that's subject to vesting
- Early-exercised options (exercised before vesting)
When 83(b) Is Beneficial
- You exercise options early at a very low strike price
- The current value (FMV) is close to your strike price
- You believe the company value will increase significantly
- You can afford to lose the money if the company fails
83(b) Must Be Filed Within 30 Days
If you're making an 83(b) election, you must file with the IRS within 30 days of the stock grant or early exercise. Miss this deadline and you lose the opportunity forever. There are no extensions or exceptions.
Your Decision Framework
Here's a structured approach to making your stock option exercise decision:
Step 1: Gather Information
- Confirm your exercise window deadline
- Get exact numbers: vested shares, strike price, current 409A
- Determine if you have ISOs or NSOs
- Calculate total exercise cost
Step 2: Assess Company Health
- Research recent funding, runway, growth metrics
- Understand the preference stack
- Evaluate realistic exit scenarios
- Talk to former colleagues if possible
Step 3: Calculate Tax Implications
- For ISOs: Calculate potential AMT exposure
- For NSOs: Calculate ordinary income tax at exercise
- Consider exercising across tax years if beneficial
- Consult a tax professional for large amounts
Step 4: Make Your Decision
- Can you afford to lose the exercise cost entirely?
- Is the risk/reward ratio favorable?
- What's your alternative use for this money?
- Would you invest this amount in this company today?
The "Fresh Look" Test
Ask yourself: "If I didn't work here and had no emotional attachment, would I invest this amount of money in this company?" If the answer is no, letting the options expire might be the right choice—even if it feels like giving up.
Step 5: Take Action
- If exercising: Complete paperwork before your deadline
- Have funds ready (check, wire, or cashier's check typically)
- Get written confirmation of your exercise
- Set up estimated tax payments if needed
- Keep all documentation for tax filing
Resources for Help
- Carta: Many companies use Carta for equity management
- Secfi: Stock option financing and advice
- ESO Fund: Non-recourse option exercise financing
- Tax professional: Essential for large exercises
- Employment attorney: For negotiating extensions
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