Stock Options Vesting Calculator — 4-Year Schedule with Cliff
Most tech startup employees receive stock options under a 4-year vesting schedule with a 1-year cliff — a de facto industry standard. This calculator shows exactly how much of your grant vests at each milestone and what it could be worth after accounting for stock price appreciation. Enter your grant, your tenure, and an annual growth assumption to get a full vesting table.
Standard tech startup vesting: 25% vests after 1 year (cliff), then the remaining 75% vests monthly over years 2–4 (2.083%/month). After 2 years you own 50%; after 3 years, 75%; after 4 years, 100%. Example: a $100,000 grant at 10%/yr growth is worth $27,500 vested at the cliff, $60,500 at 2 years, $100,125 at 3 years, and $146,410 fully vested at 4 years.
When to use this calculator
- Tech employees evaluating equity in a new job offer
- Find out how much equity you forfeit if you leave before the cliff
- Compare equity packages across competing offers
- Model your equity value under different stock growth scenarios
- Negotiate acceleration clauses in an acquisition or termination
Worked Example: $100,000 grant at 10%/year growth
- Grant: $100,000 | Years at company: 4 | Annual growth: 10%
- Year 1 cliff (25% vested): $100,000 × 0.25 × 1.10¹ = $27,500
- Year 2 (50% vested): $100,000 × 0.50 × 1.10² = $60,500
- Year 3 (75% vested): $100,000 × 0.75 × 1.10³ = $99,825
- Year 4 (100% vested): $100,000 × 1.00 × 1.10⁴ = $146,410
How it works
2 min readStock options and equity compensation are a defining feature of tech employment. Understanding exactly how vesting works helps you compare offers, negotiate terms, and decide whether to stay through a critical milestone.
How the Standard 4-Year Vesting Schedule Works
Almost every US tech startup (and many global ones) follows this template:
1. 1-year cliff: Nothing vests for the first 12 months. On the 1-year anniversary, 25% of your total grant vests in one block.
2. Monthly vesting (months 13–48): The remaining 75% vests in equal monthly installments — roughly 2.083% of your total grant each month.
3. Full vesting at 4 years: After exactly 4 years, 100% of your grant belongs to you.
Vesting Schedule Table — $100,000 Grant, 10%/yr Growth
| Milestone | Vested % | Shares Vested | Estimated Value |
|---|---|---|---|
| < 1 year | 0% | 0 | $0 (cliff not reached) |
| 1 year (cliff) | 25% | 25% of grant | $27,500 |
| 18 months | 37.5% | 37.5% of grant | $43,874 |
| 2 years | 50% | 50% of grant | $60,500 |
| 3 years | 75% | 75% of grant | $99,825 |
| 4 years | 100% | 100% of grant | $146,410 |
Values assume 10% annual stock price appreciation. Nominal (0% growth) values are simply grant × vested %.
The Vesting Formula
0.25 + ((years − 1) / 3) × 0.75 for years ≥ 1 (and ≤ 4)grant × vested_fraction × (1 + annual_rate)^yearsWhat Makes Equity Valuable (or Not)
Tax Considerations
This calculator estimates equity value. For tax decisions, consult a CPA who specializes in equity compensation.
Frequently asked questions
What is the 1-year cliff in stock option vesting?
The cliff is a waiting period before any shares vest. Under the standard 4-year plan with a 1-year cliff, you get nothing if you leave before your first anniversary. On day 365, 25% of your entire grant vests at once. After that, shares vest monthly for 3 more years.
How much equity vests per month after the cliff?
After the 1-year cliff, the remaining 75% of your grant vests over 36 months — that's 75% ÷ 36 = 2.0833% of your total grant per month. On a $100,000 grant, that's $2,083 per month (at the original grant price).
What happens to unvested options when I quit or get laid off?
Unvested options are forfeited — returned to the company's option pool. You only keep what has already vested. This is why leaving at 11 months means losing 25% of your grant versus leaving one month later and keeping it.
How long do I have to exercise vested options after leaving?
The standard post-termination exercise window is 90 days. Miss it and you lose those options. A few employee-friendly companies offer 5-year or even 10-year windows. This should be negotiated before you sign — it is often more valuable than extra salary.
What is the difference between ISOs and NSOs?
ISOs (Incentive Stock Options) get favorable capital-gains tax treatment if you meet holding requirements, but they have annual limits ($100k/year exercisable) and are subject to AMT. NSOs (Non-Qualified Stock Options) are taxed as ordinary income on the spread at exercise. Most early startup employees receive ISOs up to the limit, then NSOs above it.
Can vesting be accelerated if the company is acquired?
Yes, many offer letters include acceleration clauses. Single-trigger acceleration vests remaining shares automatically on acquisition. Double-trigger requires both an acquisition AND loss of your job. Double-trigger is more common. Negotiate this before signing — standard offers often don't include it.
What is an 83(b) election and when does it matter?
An 83(b) election lets you pay taxes on restricted stock at the grant date (when the price is low) instead of as shares vest (when the price may be high). It must be filed within 30 days of the grant. It's most valuable for early employees with very low-priced grants. For options, it only applies if you early-exercise.
How do I value my startup options if the company is private?
The most recent 409A valuation sets the fair market value (FMV) and your strike price. Your estimated gain = (current 409A FMV − strike price) × vested shares. In practice, this is a paper gain until a liquidity event (IPO, acquisition). Many private company options expire worthless — diversify accordingly.
What is a typical tech startup equity grant in dollar terms?
Equity grants vary widely by role and stage. Early employees (pre-seed) may get 0.5–2%+ of the company. Series A hires: 0.1–0.5%. Series B–C: 0.01–0.1%. In dollar-value terms (using 409A), grants for senior engineers at a Series B company often range $50,000–$200,000 over 4 years.
Should I exercise options early?
Early exercise (buying shares before they vest, combined with an 83(b) election) can start your capital gains clock earlier and reduce taxes if the stock appreciates. The risk: you pay real money now for shares that may be worthless. Only consider this for very early-stage companies with very low strike prices and high conviction.