Vesting Schedule Calculator

About the Vesting Schedule Calculator

The Vesting Schedule Calculator models the standard startup equity vesting timeline, showing exactly how many shares vest each month over your vesting period. Most startup stock option grants follow a 4-year vesting schedule with a 1-year cliff: no shares vest in the first year, then 25% vests at the cliff date, followed by monthly vesting of the remaining 75% over the next 36 months.

Vesting exists to align employee incentives with long-term company building. It ensures that equity recipients must continue contributing to the company to earn their full allocation. For employees, understanding your vesting schedule is crucial for career planning, financial projections, and evaluating the true value of your compensation package.

This calculator lets you customize the total grant, vesting period, and cliff length, then displays a complete month-by-month vesting table. You can also input a price per share to see the dollar value of vested and unvested shares at each milestone.

When This Page Helps

Your vesting schedule determines when you actually own your equity. Before the cliff, you own nothing. After the cliff, you own 25% of your grant, and the rest vests monthly. Understanding this timeline helps you plan career moves (staying past the cliff is critical), negotiate offers (more shares or shorter cliff?), and manage finances (knowing the value of equity you'll have at any point). This calculator makes the often-confusing vesting math crystal clear.

How to Use the Inputs

1. Enter the total number of shares in your option grant.
2. Enter the vesting period in months (typically 48 months / 4 years).
3. Enter the cliff period in months (typically 12 months / 1 year).
4. Optionally enter the current price per share for dollar value calculations.
5. Enter how many months you've already served to see your current vested amount.
6. Review the month-by-month vesting table and cumulative progress.

Example Calculation

Tips & Best Practices

• Never leave a startup 1–2 months before your cliff — you'd forfeit 25% of your grant.
• Check if your option agreement includes acceleration on change of control (single or double trigger).
• Some companies offer 3-year vesting or no cliff for senior hires — everything is negotiable.
• Track your vesting dates carefully; you'll need this info for tax planning around exercise.
• If you're a co-founder, insist on vesting for all founders to protect against early departures.
• Consider early exercise + 83(b) election within 30 days of grant to start your capital gains clock.
• Keep records of each vesting tranche date — different tranches may have different tax holding periods.

How Startup Vesting Works

Vesting is the process by which employees earn their equity over time. The purpose is simple: reward continued contribution and protect the company from awarding equity to short-tenure employees. When you receive a stock option grant, you don't own those shares immediately — you earn the right to purchase them as they vest according to your vesting schedule.

The Cliff: Your Most Important Milestone

The cliff is the first major vesting event. In a standard 4-year schedule with a 1-year cliff, 25% of your total grant vests on your first anniversary. This is a significant milestone worth planning around. Leaving one month before your cliff means losing tens of thousands of dollars in equity. Always know your cliff date.

Monthly Vesting After the Cliff

After the cliff, shares vest monthly in equal installments. With a 40,000-share grant over 48 months, approximately 833 shares vest each month after the 12-month cliff. This steady accumulation continues until the full grant is vested at your 4-year anniversary.

Vesting and Career Decisions

Vesting schedules create natural decision points. After the cliff, each additional month of tenure adds incrementally to your vested stake. The optimal career move considers the marginal value of continued vesting versus opportunity cost. As you approach full vesting, the marginal value of each additional month decreases, which is one reason tenure tends to cluster around 3–4 years at startups.

Frequently Asked Questions

• What is the standard vesting schedule?

  The most common schedule is 4 years total with a 1-year cliff. Nothing vests during the first year. At the 1-year mark, 25% of the total grant vests at once (the cliff). After that, shares vest monthly (1/48th of the total per month) for the remaining 36 months.

• What happens at the cliff?

  The cliff is the minimum service period before any shares vest. At a standard 1-year cliff, 25% of your total grant vests all at once on your 1-year anniversary. If you leave before the cliff, you get nothing. The cliff protects the company from short-tenure employees receiving equity.

• What happens to unvested shares if I leave?

  Unvested shares are forfeited when you leave the company. They return to the option pool and can be granted to future employees. Only your vested shares remain yours, and you typically have a 90-day window to exercise vested options before they expire.

• Can I negotiate my vesting schedule?

  Yes, but it depends on leverage. Common negotiations include: additional shares, shorter cliff (6 months instead of 12), credit for time already served during an acquisition, and acceleration clauses. Senior hires and executives have more negotiating power on vesting terms.

• What is acceleration?

  Acceleration speeds up your vesting upon certain events. Single-trigger acceleration means your shares fully vest upon an acquisition. Double-trigger acceleration requires both an acquisition AND a qualifying termination (layoff, role change). Double-trigger is more common and more reasonable for most employees.

• Do co-founders need vesting?

  Absolutely yes. Founder vesting protects all co-founders if someone leaves early. Without vesting, a co-founder who leaves after 3 months keeps their full equity stake. Standard founder vesting is 4 years with no cliff (or a 1-year cliff). It's the most important protection co-founders can put in place.