What Is Vesting? Stock Option Schedules Explained

Vesting is the schedule by which an employee earns full ownership of equity compensation — stock options or restricted stock units — over a period of time, rather than receiving it all at once. A job offer that includes “10,000 shares, vesting over four years” doesn’t hand you 10,000 shares on day one; it means you gradually earn the right to those shares as you stay employed, and if you leave early, you forfeit whatever hasn’t vested yet.

Why companies vest equity instead of granting it outright

Equity compensation is meant to align an employee’s incentives with the company’s long-term success and to retain talent. Granting all of it immediately would defeat both purposes: an employee could take the full grant and leave the next day, and there’d be no ongoing incentive tied to sticking around. Vesting solves this by making the equity a claim on the future, contingent on continued employment — the longer you stay, the more of the grant you actually own.

The standard structure: four years, one-year cliff

The most common vesting schedule in tech, though far from universal, is four years with a one-year cliff:

• The cliff. Nothing vests until you’ve been employed for a full year. If you leave — or are let go — before hitting the cliff, you walk away with zero equity from that grant, regardless of how close you were.
• After the cliff. Typically 25% of the total grant vests immediately at the one-year mark, then the remainder vests monthly or quarterly over the following three years.
• Full vesting. After four years, the entire original grant has vested and belongs to you outright, independent of continued employment (though options may still require exercising before they expire).

A grant of 10,000 shares under this schedule means: zero shares if you leave in month 11, 2,500 shares if you leave the day after your one-year anniversary, and roughly 208 additional shares vesting each month after that until the full 10,000 vest at the four-year mark.

Options vs RSUs, and why vesting means something different for each

Vesting applies to both stock options and restricted stock units (RSUs), but what “vested” actually gets you differs:

	Stock options	RSUs
What vests	The right to buy shares at a fixed strike price	The shares themselves
Action needed after vesting	Must exercise (pay the strike price) to own shares	Nothing — shares are simply delivered
Value if the stock price falls below the strike price	Worthless (underwater)	Still has value, just less
Tax timing	Typically at exercise and/or sale	Typically at vesting

Options only have value if the company’s share price is above the strike price at the time you exercise; RSUs convert directly into shares regardless of price movement, which is why many later-stage and public companies have shifted toward granting RSUs instead of options for at least part of compensation.

Acceleration clauses

Some grants include acceleration provisions that speed up vesting under specific conditions, most commonly an acquisition. “Single-trigger” acceleration vests some or all remaining equity immediately upon a change of control. “Double-trigger” acceleration — more common, and generally viewed as fairer to the acquiring company — requires both a change of control and the employee being terminated (or their role being materially changed) within some window afterward. Understanding which type, if either, applies to a grant matters a lot if you’re evaluating an offer at a company that might realistically get acquired.

Why this matters when evaluating a job offer

Vesting terms materially change what an equity grant is actually worth to you, independent of the headline number. A grant with a steep cliff and a long total vesting period is worth less to someone who might not stay four years than an otherwise-identical grant with monthly vesting from day one and no cliff. It also interacts with how startup funding rounds affect your equity’s value — a grant priced against an early-stage valuation carries more dilution risk through future rounds than one issued later, closer to an IPO or acquisition, when the market cap is more established.

For anyone thinking about equity compensation the way they’d think about any other investment, it’s worth applying the same discipline you would to public market decisions — not chasing headline share counts any more than you’d chase headline stock prices, and recognizing that unvested equity is a probabilistic claim on the future, not cash in hand. The logic isn’t so different from why dollar-cost averaging exists for public equities: value that arrives gradually, tied to a schedule rather than a single point in time, behaves differently than a lump sum, and it’s worth planning around that difference rather than ignoring it.

The takeaway

Vesting turns an equity grant into a schedule, not a lump sum: you earn ownership gradually, typically with a cliff before anything vests at all, and you forfeit whatever hasn’t vested if you leave early. The mechanics differ meaningfully between options (which require exercising at a strike price) and RSUs (which convert directly to shares), and acceleration clauses can change the calculus entirely in an acquisition. When comparing job offers, the vesting schedule is at least as important as the size of the grant — a large grant on a slow, cliff-heavy schedule can be worth less in practice than a smaller one that vests evenly from the start.