ISO $100,000 Limit

What it means

Companies offer Incentive Stock Options (ISOs) because they have special tax benefits. However, the government sets a limit on how many of these you can earn in a single calendar year. Specifically, only $100,000 worth of options—based on their value when they were first granted to you—can become available to buy, or "vest," each year.

If your company gives you more than $100,000 worth of these options, the excess amount is automatically changed to Non-Qualified Stock Options (NSOs). NSOs do not have the same special tax benefits as ISOs. This rule keeps people from using these tax breaks for very large amounts of stock.

A simple example

Imagine Sarah is granted 18,000 options at a price of $8 per share. The total value at the grant date is $144,000. Under the rules, only $100,000 worth (12,500 options) can be ISOs for that year. The remaining 5,500 options will be treated as NSOs. Even if Sarah vests them all at once, the tax rules automatically split them into two different categories.

Why it matters to you

• Your tax bill will be different because NSOs are taxed as ordinary income when you exercise them, unlike ISOs.
• If your company is bought out, your vesting schedule might speed up, which could accidentally push you over the $100,000 limit.
• A tax professional can help you understand how this split affects your total taxes for the year.

Common mistakes to avoid

• Assuming all your options will be taxed as ISOs just because your contract says "Incentive Stock Option."
• Failing to track how many options vest in a single calendar year, especially if you have grants from different years.

Words used on this page

• Incentive Stock Option (ISO): A type of stock option with special tax benefits.
• Non-Qualified Stock Option (NSO): A regular stock option that lacks special tax breaks.
• Grant Date: The day your company officially gives you the option to buy stock.
• Vesting: The process of earning the right to buy your granted stock options over time.
• Ordinary Income: Money you earn from your job, which is taxed at standard income tax rates.