Vesting Schedules Explained — How Startup Equity Vests Over Time

A vesting schedule is the timeline over which you earn ownership of your equity. In startups, vesting ensures that founders and employees stay committed — you don't receive all your shares on day one, but gradually over a set period, typically four years.

What Is a Vesting Schedule?

A vesting schedule defines when you gain full ownership of shares or stock options granted to you by a company. Until shares vest, they are "unvested" — meaning the company can reclaim them if you leave. Once shares vest, they belong to you permanently (subject to any exercise windows for options).

The purpose of vesting is alignment. It protects co-founders from someone walking away with a large equity stake after a few months. It incentivizes employees to stay and contribute over the long term. And it gives investors confidence that the founding team is locked in.

The Standard 4-Year Vesting Schedule With a 1-Year Cliff

The most common vesting schedule in startups is 4 years with a 1-year cliff. Here is exactly how it works:

• Total vesting period: 4 years (48 months)
• Cliff: 1 year (12 months)
• After the cliff: Monthly vesting for the remaining 36 months

Example: You receive a grant of 48,000 shares with standard 4-year/1-year cliff vesting.

| Milestone | Shares Vested | Cumulative | % Vested |

|-----------|--------------|------------|----------|

| Month 1-11 | 0 | 0 | 0% |

| Month 12 (cliff) | 12,000 | 12,000 | 25% |

| Month 13 | 1,000 | 13,000 | 27.1% |

| Month 24 | 1,000 | 24,000 | 50% |

| Month 36 | 1,000 | 36,000 | 75% |

| Month 48 | 1,000 | 48,000 | 100% |

The cliff is the critical piece. If you leave before 12 months, you get nothing. At exactly 12 months, 25% of your shares vest all at once. After that, shares vest monthly in equal installments.

Some companies use quarterly vesting after the cliff instead of monthly. The economics are the same — monthly is simply more granular.

Founder Vesting vs. Employee Vesting

Founders and employees both vest equity, but the mechanics and expectations differ.

Founder Vesting

Founders receive restricted stock awards (RSAs) — actual shares purchased at a very low price (often $0.0001 per share). These shares are subject to a repurchase right that lapses according to the vesting schedule.

Key differences for founders:

• Shares are purchased, not granted. You buy your shares on day one (often for pennies) and then vest into them.
• Vesting protects co-founders from each other. If one founder leaves after 6 months, the company can repurchase their unvested shares at the original purchase price.
• 83(b) election matters. Founders should almost always file an 83(b) election within 30 days to lock in the low tax basis. Without it, you owe income tax as each tranche vests at the current (likely higher) fair market value.
• Credit for time served. Some founders negotiate vesting that starts before the incorporation date, reflecting months or years of work they did before formally starting the company.

Employee Vesting

Employees typically receive stock options (ISOs or NSOs) rather than restricted stock. The vesting mechanics are the same — 4 years, 1-year cliff — but the ownership model is different.

• Options give the right to buy. A vested option lets you purchase shares at a fixed strike price (the fair market value on your grant date). You don't own anything until you exercise.
• ISOs vs. NSOs matter. Incentive Stock Options (ISOs) and Non-Qualified Stock Options (NSOs) have different tax treatment. ISOs are generally more favorable for employees.
• Post-termination exercise window. If you leave, you typically have 90 days to exercise vested options. After that, they expire. Some companies offer extended exercise windows of 5-10 years.

Acceleration Clauses

Acceleration clauses speed up vesting when specific events occur. There are two types:

Single-Trigger Acceleration

Vesting accelerates based on one event — typically a change of control (the company is acquired).

Example: A founder has 2 years remaining on their vesting schedule. The company is acquired. With single-trigger acceleration, all unvested shares vest immediately upon closing.

Who gets it: Usually only founders and C-level executives. Investors generally dislike single-trigger acceleration because it removes incentive for the team to stay post-acquisition.

Double-Trigger Acceleration

Vesting accelerates only when two events occur:

1. A change of control (acquisition), AND
2. The individual is terminated without cause (or resigns for "good reason") within 12-24 months of the acquisition

Example: The company is acquired. You continue working for the acquirer. Six months later, they eliminate your role. Your double-trigger clause kicks in, and your remaining unvested shares vest immediately.

Who gets it: This is the standard for employees and is increasingly common for founders as well. Investors and acquirers prefer double-trigger because it keeps the team engaged through the transition.

Typical acceleration amounts:

• 100% acceleration — All unvested shares vest. Most common for founders.
• 50% acceleration — Half of unvested shares vest. Sometimes used for senior hires.
• 12 months acceleration — 12 additional months of vesting occur immediately. A middle ground.

Early Exercise (Section 83(b) and Options)

Some companies allow employees to early exercise their stock options — purchasing unvested shares before they vest. This is most common at very early-stage startups where the share price is still low.

Why would you early exercise?

1. Start the capital gains clock. By purchasing shares early, you begin the holding period for long-term capital gains treatment (which requires holding for at least 1 year after exercise and 2 years after grant for ISOs).
2. Lock in a low tax basis. If you file an 83(b) election within 30 days of early exercising, you pay tax on the current (low) value rather than the future (hopefully higher) value at vesting.
3. Minimize AMT exposure. For ISOs, the spread between strike price and fair market value at exercise is an AMT preference item. Early exercising when the spread is zero eliminates this.

The risk: If you leave before shares vest, the company repurchases your unvested shares at the original exercise price. You get your money back, but you've tied up capital and potentially paid taxes on shares you no longer own.

Tax Implications of Vesting

Vesting has real tax consequences. The specifics depend on the type of equity:

Restricted Stock Awards (RSAs)

• Without 83(b): You owe ordinary income tax each time a tranche vests, based on the fair market value at vesting. This can be devastating if the company's value has increased significantly.
• With 83(b): You pay ordinary income tax on the full grant at the time of purchase (usually pennies for early founders). Future appreciation is taxed as capital gains when you sell.

Stock Options (ISOs)

• At exercise: No regular income tax, but the spread (FMV minus strike price) counts as an AMT preference item.
• At sale (qualifying disposition): The entire gain is taxed as long-term capital gains if you held the shares for 1+ year after exercise and 2+ years after grant.
• At sale (disqualifying disposition): The spread at exercise is taxed as ordinary income; remaining gain is capital gains.

Stock Options (NSOs)

• At exercise: The spread (FMV minus strike price) is taxed as ordinary income and subject to payroll taxes.
• At sale: Any additional gain above the FMV at exercise is taxed as capital gains.

Vesting Schedule Variations

While the 4-year/1-year cliff is standard, you'll occasionally encounter other structures:

• 3-year vesting — More common in later-stage companies or acqui-hires. Less dilutive to the employee since they vest a higher percentage each month.
• 5-year or 6-year vesting — Used by some larger tech companies (Amazon's vesting is famously back-weighted). Rare in startups.
• Back-weighted vesting — Instead of equal monthly installments, more shares vest in later years (e.g., 10%, 20%, 30%, 40% per year). Incentivizes long tenure.
• Milestone-based vesting — Shares vest when specific goals are hit (revenue targets, product launches) rather than on a time schedule. Common for advisors.
• Advisor vesting — Typically 1-2 years with monthly vesting and no cliff. Advisors get fewer shares and vest faster.

Frequently Asked Questions

What is a standard vesting schedule for a startup?

The standard vesting schedule is 4 years with a 1-year cliff. This means you vest 25% of your shares at the 12-month mark, then the remaining 75% vests in equal monthly installments over the next 36 months. This structure is used by the vast majority of venture-backed startups for both founders and employees.

What happens to unvested shares if I leave?

If you leave before your shares are fully vested, you forfeit all unvested shares. For restricted stock, the company exercises its repurchase right to buy back unvested shares at the original purchase price. For stock options, unvested options simply expire. You keep everything that has already vested, though with options you typically have 90 days to exercise after departure.

Do founders need vesting schedules?

Yes. Investors require it, and it protects co-founders from each other. If a co-founder with a 40% stake leaves after three months without vesting, they walk away with 40% of your company while contributing almost nothing. Vesting ensures equity splits remain fair. Even solo founders should set up vesting — investors expect it and it demonstrates good governance.

What is the difference between single-trigger and double-trigger acceleration?

Single-trigger acceleration vests all your unvested shares when one event occurs, typically an acquisition. Double-trigger acceleration requires two events — an acquisition plus termination without cause within a defined period (usually 12-24 months). Double-trigger is the market standard because it balances employee protection with the acquirer's need to retain talent.

Can I negotiate my vesting schedule?

Yes. Common negotiation points include: reducing the cliff from 12 months to 6 months, adding acceleration clauses, crediting prior work toward vesting (especially for founders who worked on the idea pre-incorporation), and extending the post-termination exercise window for options from 90 days to 1-10 years. Senior hires have the most leverage to negotiate these terms.

What is early exercise and should I do it?

Early exercise means purchasing your unvested stock options before they vest. Combined with an 83(b) election, it can significantly reduce your tax burden by locking in a low share price as your tax basis. It makes the most sense when the company is very early stage and the share price is near zero. The risk is that if you leave before vesting, the company repurchases your unvested shares — you get your exercise price back but lose any tax benefit.

How does vesting affect my taxes?

The tax impact depends on your equity type. For restricted stock with an 83(b) election filed, you pay minimal tax upfront and capital gains later. Without an 83(b), you owe ordinary income tax at each vesting event based on the current fair market value. For stock options, you generally owe no tax until you exercise (ISOs may trigger AMT). The specifics vary by situation — consult a tax advisor for personalized guidance.

Track Every Vesting Schedule in One Place

Managing vesting schedules across founders, employees, and advisors gets complicated fast — especially when people have different start dates, grant sizes, and acceleration terms. Slyced tracks every vesting schedule automatically, shows you who's vesting what and when, and alerts you before cliffs hit and exercise windows close.

Set up your vesting schedules in Slyced — free for up to 25 stakeholders.