Vesting Schedule

What Is a Vesting Schedule?

A vesting schedule is the timeline that governs when you earn the right to exercise your stock options or receive ownership of shares granted to you. Equity compensation is almost never fully available on day one. Instead, it vests over time, incentivizing you to stay with the company and continue contributing. The vesting schedule is one of the most critical terms in your equity package because it dictates when your options become exercisable and how much equity you stand to forfeit if you leave.

Common Vesting Structures

The Four-Year Standard

The most common vesting schedule in the startup world is a four-year vest with a one-year cliff:

• Year 1 (the cliff): No options vest during the first 12 months. On your one-year anniversary, 25% of your total grant vests at once.
• Years 2–4: The remaining 75% vests in equal monthly installments over the next 36 months. Each month, approximately 2.08% of the total grant vests.

This means that after two years, 50% of your options have vested. After three years, 75%. After four years, you are fully vested.

Monthly vs. Quarterly Vesting

After the cliff, options can vest on a monthly or quarterly basis. Monthly vesting is more common and more employee-friendly because you earn equity in smaller, more frequent increments. Quarterly vesting delivers larger chunks less often.

Other Structures

• Three-year vesting — Less common but used by some companies, typically without a cliff.
• Back-weighted vesting — More equity vests in later years. Amazon famously uses a 5/15/40/40 schedule for RSUs.
• Milestone-based vesting — Equity vests upon achieving specific performance milestones rather than (or in addition to) time-based milestones.

Acceleration Provisions

Single-Trigger Acceleration

Single-trigger acceleration means that some or all of your unvested equity vests immediately upon a single event — most commonly a change of control (acquisition). This protects you in the event the company is acquired and your options might otherwise be canceled.

Double-Trigger Acceleration

Double-trigger acceleration requires two events: typically a change of control plus an involuntary termination (being fired without cause or constructively terminated). This is more common than single-trigger because it is less expensive for acquirers and still protects employees from being let go post-acquisition.

Negotiating Acceleration

Acceleration provisions are more commonly negotiated by senior executives, but any employee can ask. Even partial acceleration (e.g., 12 months of accelerated vesting upon acquisition) can provide meaningful protection.

Practical Implications for Startup Employees

Planning Around Your Vesting Schedule

Your vesting schedule directly affects career decisions. Know your key vesting milestones and consider them when evaluating opportunities:

• The cliff date — This is your most important near-term milestone. Leaving before the cliff means losing everything.
• Major vesting tranches — If you are close to a significant vesting event, it may be worth staying a few additional months.
• Full vesting date — After four years, you are no longer earning new equity from your initial grant (though refresher grants may extend the incentive).

Tax Planning and Vesting

Your vesting schedule interacts with tax planning in important ways. If you plan to exercise options as they vest, you can spread the tax impact across multiple years. If you wait until a large block of options has vested and exercise all at once, you may face a larger tax hit in a single year.

Vesting Does Not Mean You Must Exercise

Vesting gives you the right to exercise but does not obligate you to do so. You can let vested options sit until you are ready to exercise, up until they expire (typically 10 years from the grant date, or the end of your PTEP after departure). This flexibility allows you to time your exercise for tax or financial reasons.

How It Relates to Exercising Stock Options

The vesting schedule determines when you can exercise. Understanding its structure helps you plan your exercise timing, manage tax exposure, and make informed career decisions. Treat your vesting schedule as the roadmap for your equity strategy — it tells you when your options become available and helps you prioritize which tranches to exercise first.