How does stock option vesting work in the US?

If you work for a startup or pre-IPO company, you may have received stock options as part of your pay. But when can you use them? How does it work? And what happens if you leave the company before a certain date?

Stock option vesting controls the timeline for when you can exercise your options and turn them into actual shares. Different companies set up different schedules, and the structure affects when and how much you can cash out.

So, how does stock option vesting work? Here's everything you need to know.

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What are stock options?

Stock options let you buy shares of your company at a fixed price, known as the strike price or exercise price.

Your employer grants you these options as part of your compensation, but you don't automatically own the shares. Instead, you can purchase them later.

If the company's stock price goes up, you can buy shares at the lower strike price and either hold them or sell them at the higher market price. That difference becomes your profit.

The strike price is locked in when your options are granted, so if your company grows and the stock value increases, your options become more valuable.

What does stock option vesting mean?

Vesting is the process that determines when you've earned the right to exercise your stock options. When options are first granted to you, they're usually unvested, which means that you can't use them yet.

As you meet certain conditions (typically, staying with the company for a set period of time), your options vest. Once they vest, you own the right to exercise them and buy the shares at your strike price.

Essentially, you can think of vesting as a timeline where you gradually earn access to your full stock option grant.

For example, if you were granted 10,000 options with a 4-year vesting schedule, you wouldn't be able to exercise all 10,000 right away. Instead, portions of that grant would vest over time as you continue working at the company.

The most common stock option vesting schedule types

Time-based vesting

With time-based vesting, your options vest as you continue working at the company for a set period. The longer you stay, the more options vest.

This is the most common type of vesting.

Most time-based schedules don't require you to hit performance targets or reach any milestones. You just need to stay employed by the same company. But if you leave before your options vest, you'll lose the unvested portion.

The 4-year vesting schedule

A 4-year vesting schedule is standard at many startups and tech companies.

You're granted a total number of options upfront, but you earn the right to exercise them gradually over 4 years.

For example, if you get 4,800 options, you might vest 100 options each month for 48 months. All 4,800 options will be vested and available to exercise after 4 years.

Some companies include a 1-year cliff, which means that none of your options vest during your first year. After that cliff period ends, you vest a large chunk all at once. Then, the rest vests monthly or quarterly.

Monthly vs quarterly vs annual vesting

Vesting frequency is how often your options become available to exercise:

• Monthly vesting: A portion of your options vests every month, which gives you the most frequent access to new shares
• Quarterly vesting: Options vest every 3 months, so you get a larger chunk but less often than monthly vesting
• Annual vesting: Options vest once per year on your grant anniversary, releasing a full year's worth at once

Keep in mind that an annual vesting schedule means waiting a lot longer between vesting events, which can be important if you're planning to leave the company or exercise options.

Front-loaded vs back-loaded schedules

Most vesting schedules are linear, with the same amount vesting each period. But some companies use front-loaded or back-loaded schedules to change up the pace.

• Front-loaded schedules: You vest a larger percentage of your options in the early years and less in the later years
• Back-loaded schedules: You vest fewer options upfront and get a larger portion toward the end of the schedule

For example, a front-loaded schedule might give you 40% of your options in the first two years and 60% in the final two years. A back-loaded schedule could reverse that, with 30% in the first two years and 70% in the last two years.

Companies use back-loaded schedules to encourage employees to stay longer. In turn, front-loaded schedules reward early joiners who want to exercise options sooner.

Performance-based vesting

Performance-based vesting ties your options to how well you perform.

Your options won't vest automatically. Instead, you'll need to meet performance criteria, such as hitting revenue targets, reaching a certain number of customers, or meeting other individual performance goals.

If you meet the goals, your options vest. If you don't, they remain unvested or may even be forfeited. In other words, this structure is a lot more uncertain than time-based vesting.

Milestone-based vesting

Milestone-based vesting releases options when the company hits milestones. These are usually major events like closing a funding round, completing an acquisition, or going public.

For example, 25% of your options might vest when the company raises a Series B round, another 25% when revenue hits 10 million USD, and the rest when the company IPOs.

Milestone-based vesting is less predictable than time-based vesting because you can't control when (or even if) the company reaches those milestones.

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What does the cliff mean in practice?

A cliff is a waiting period before any of your options vest. During this time, you're earning options, but you can't access them yet.

The most common cliff is 1 year.

If you leave the company before that first year is up, you walk away with zero vested options, even if you worked there for 11 months. Once you pass the 1-year mark, a large portion vests all at once, usually 25% of your total grant.¹

After the cliff, your remaining options typically vest monthly or quarterly. So if you got 4,800 options with a 1-year cliff and 4-year total vesting, 1,200 options would vest after 12 months, and the remaining 3,600 would vest over the next 36 months.

How is stock option vesting calculated?

Stock option vesting depends on your schedule type and frequency.

For a standard 4-year monthly vesting schedule with no cliff, you just need to divide your total options by 48 months. For example, if you have 4,800 options, 100 vest each month.

If your schedule comes with a 1-year cliff, nothing vests for the first 12 months. On month 13, you usually vest 25% all at once. Then, the remaining 75% vests monthly over the next 36 months.

Here's an example with 4,800 options, a 1-year cliff, and monthly vesting after the cliff:

• Months 1–12: 0 options vest
• Month 13: 1,200 options vest (25% cliff release)
• Months 14–48: 100 options vest per month
• Total after 48 months: 4,800 options fully vested

Your equity grant documents will spell out your schedule, including the start date, total number of options, vesting frequency, and any cliff period.

What happens to stock options if you leave the company?

When you leave, you keep any vested options, but you lose unvested ones.

For example, if you've been at the company for 2 years on a 4-year schedule, roughly 50% of your options are vested. You keep those, but the other 50% goes away.

You also have a limited window to exercise your vested options after you leave. Usually, it's 90 days, but it ultimately depends on your company.¹

If you don't exercise within that period, your vested options expire, and you lose them, too.

Exercising costs money because you're buying the shares at your strike price, and you might owe taxes on the transaction. If you can't afford to exercise or don't want to pay taxes on shares you can't sell yet, you may have to let your options expire.

What does exercising stock options mean?

Exercising means buying your company's shares at the strike price set in your option grant. Once you exercise, you own the stock.

For example, let's say you have 1,000 vested options with a strike price of 5 USD per share. To exercise them, you pay 5,000 USD (1,000 shares × 5 USD). In return, you get 1,000 shares of company stock.

If the company's stock is now worth 20 USD per share, you just bought 20,000 USD worth of stock for just 5,000 USD. But you can't access that 15,000 USD gain until you sell the shares, which might not be possible if your company is still private.

Exercising costs cash upfront, and you may owe taxes even if you can't sell the shares yet. That's why many people wait to exercise until their company goes public or gets acquired, when they can sell and cover the exercise cost right away.

How do taxes work on stock options in the US?

Taxes largely depend on the type of options you have and whether they're incentive stock options (ISOs) or non-qualified stock options (NSOs).

Here's how they compare:

• ISOs (Incentive Stock Options): You don't owe regular income tax when you exercise, but you may trigger the alternative minimum tax (AMT), and if you hold the shares long enough, your profit is taxed as long-term capital gains at lower rates
• NSOs (Non-Qualified Stock Options): You owe ordinary income tax on the difference between your strike price and the fair market value when you exercise, plus capital gains tax on any additional increase when you sell

Most startup employees get ISOs because of the potential tax benefits, but the AMT can create a large tax bill even when you haven't sold shares or made any cash. In turn, NSOs are easier to understand but come with higher taxes upfront.

FAQs

Can I negotiate my vesting schedule?

You can try, especially if you're a senior hire or joining an early-stage startup. For example, your company may agree to shorten the cliff period or accelerate the vesting timeline.

That said, many companies have standard vesting terms they apply to all employees, and they may not budge.

Is ISO better than RSU?

It depends.

ISOs give you the option to buy shares at a set price, which means that you need cash upfront to exercise and may face a large AMT bill before you can sell. RSUs are granted as actual shares that vest over time, and you don't pay anything to receive them (but you owe income tax when they vest).

ISOs can result in better tax treatment if the stock price goes up and you meet the holding requirements, but RSUs are simpler and don't require you to spend money before the shares are worth anything.

Learn more about how to report RSUs on your tax return.

Do stock options expire?

Yes, stock options expire if you don't exercise them within a set timeframe.

When you leave the company, you usually get a 90-day window to exercise your vested options, or you'll lose them. That said, some companies have longer windows.¹

What happens to vested stock options?

Once your options vest, you own the right to exercise them and buy the shares at your strike price. Vested options stay vested even if you leave the company, but you'll need to exercise them within your post-termination window (usually 90 days), or they'll expire.¹

If you stay at the company, your vested options remain available to exercise until they hit their expiration date. You can exercise all your vested options at once or in smaller batches.

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Sources

1. Carta - Vesting

Sources checked 05/25/2026