Curated by: Rubric Advisors
Equity Compensation
Stock Options 101
A foundational guide to employee stock options, covering how they work, the differences between ISOs and NSOs, and key tax considerations including AMT.
Stock Options 101
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What Are Stock Options?
- Stock options give you the right to buy company shares at a fixed price called the strike price
- The strike price is typically set at fair market value on the date of your grant
- Options have value when the current share price exceeds your strike price, known as being in the money
- You are not obligated to exercise your options and can let them expire if they are underwater
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Full Guide
What Are Stock Options?
- Stock options give you the right to buy company shares at a fixed price called the strike price
- The strike price is typically set at fair market value on the date of your grant
- Options have value when the current share price exceeds your strike price, known as being in the money
- You are not obligated to exercise your options and can let them expire if they are underwater
How Vesting Works
- Vesting determines when you earn the right to exercise your options over time
- A common schedule is four-year vesting with a one-year cliff, meaning nothing vests until month twelve
- After the cliff, options typically vest monthly or quarterly over the remaining three years
- Unvested options are usually forfeited if you leave the company before they vest
ISOs vs. NSOs
- Incentive Stock Options (ISOs) receive favorable long-term capital gains treatment if holding periods are met
- ISOs must be held for at least two years from grant and one year from exercise for qualifying disposition
- Non-Qualified Stock Options (NSOs) are taxed as ordinary income on the spread at exercise
- ISOs are only available to employees, while NSOs can be granted to contractors and board members
- Most companies grant ISOs up to the $100,000 annual vesting limit and NSOs for the remainder
The AMT Trap with ISOs
- Exercising ISOs can trigger Alternative Minimum Tax even though no regular income tax is owed at exercise
- The spread between strike price and fair market value at exercise is an AMT preference item
- Large exercises in a single year can create a significant unexpected tax bill in April
- AMT paid on ISO exercises may generate a credit that can be recovered in future tax years
- Work with a tax advisor to model the AMT impact before exercising a large block of ISOs
Exercise Timing Strategies
- Early exercise at hire lets you start the capital gains holding clock and minimize AMT exposure
- Exercising throughout the year can spread AMT impact across tax years for better planning
- Waiting until close to expiration maximizes optionality but concentrates risk in company stock
- Post-IPO employees should consider a diversification plan rather than holding all shares indefinitely
- Most options expire ten years from grant or 90 days after leaving the company, whichever comes first
Key Takeaways
- Understand your grant details including strike price, vesting schedule, and expiration date before making decisions
- Know whether you hold ISOs or NSOs because the tax treatment at exercise is fundamentally different
- Model the AMT impact of any ISO exercise before committing, especially in high-income years
- Consider exercising early or incrementally rather than waiting for a single large taxable event
- Consult a financial advisor who specializes in equity compensation to build a personalized exercise plan
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