Cliff Vesting: How a Vesting Cliff Works (with Worked Examples)

A vesting cliff is the minimum period an employee must stay at a company before any of their equity grant starts vesting. The standard structure in US startups is a one-year cliff with four-year monthly vesting: nothing vests in months 1–11, then 25% vests on the first anniversary, with the remaining 75% vesting monthly over the following 36 months.

The mechanic exists because companies don’t want to give equity to people who don’t stick around. It’s a binary test — stay long enough, get a chunk; leave one day early, get zero — and that bluntness is the whole point.

Definition: Cliff vesting is a vesting schedule provision under which no equity vests until a defined minimum service period has been met, at which point a meaningful portion vests at once.

How a one-year cliff actually works

Take the standard four-year vesting schedule with a one-year cliff and a 100,000-share grant:

The 25% number isn’t arbitrary — it’s exactly one year of monthly vesting (12 × 1/48 of the grant) collapsed into a single moment. After the cliff, the schedule runs as if it had been vesting linearly the whole time.

Why startups use cliffs

Three reasons drive the structure, in roughly this order:

1. Filter out fast-fail hires. A 12-month cliff means anyone who quits or gets fired in their first year leaves with no equity at all. That protects the option pool from being drained by departures the company would rather forget.
2. Concentrate the negotiation moment. Without a cliff, an employee could leave at month 6 with 12.5% vested, sell those shares (or exercise the options), and create a long tail of micro-shareholders on the cap table. The cliff prevents that.
3. Industry-standard expectation. Funded startups use one-year cliffs because YC’s standard term sheets, post-Series-A 409A models, and most VC-friendly templates assume them. Deviating signals an unusual hire.

The result is that almost every funded US startup runs the same schedule: 4-year vest, 1-year cliff, monthly vesting after the cliff. This shows up in nearly every employee equity grant alongside a vesting schedule that determines exactly when shares become exercisable.

What happens if you leave during the cliff

Nothing. That’s the whole point.

• Voluntary resignation in months 1–11: zero shares vest. Whatever was granted reverts to the company’s option pool.
• Termination for cause during cliff: zero shares. Same outcome.
• Termination without cause during cliff: zero shares by default. Some companies give a partial cliff vesting in their offer letter for senior hires, but it’s not standard.
• Death or disability during cliff: depends on the plan document. Some grants accelerate to fully vested; others vest pro-rata; others vest nothing.

If you’re considering quitting near the cliff, the math is rarely subtle. Eleven months and 30 days versus twelve months and zero days = $0 versus 25% of your grant. For a meaningful equity package this can be a five- or six-figure decision.

Cliff vesting vs other vesting structures

The cliff is one piece of the larger vesting design. Compare it to alternatives:

• No cliff (pure monthly vesting): ~2,083 shares vest each month from day one. Simple, but doesn’t filter out short-stay hires.
• Graded vesting: Equal annual chunks (25% per year) with no monthly granularity. Common in some pre-IPO and mature-company schemes; less common in startups because it punishes employees who leave between anniversaries.
• Performance vesting: Shares vest only on hitting milestones (revenue, valuation, product). Rare in standard employee grants; common in management incentive plans.
• Cliff plus accelerator: Standard cliff with a “double trigger” acceleration clause — full vesting on a change-of-control and a termination without cause. Senior executives often negotiate this.

The most common departure from the one-year/four-year/monthly default is in advisor and board grants, which often use a 3-month or 6-month cliff with shorter total vesting (1–2 years).

How the cliff interacts with stock options

For incentive stock options and NSOs, “vested” doesn’t mean “owned.” Vested options are exercisable — you can pay the strike price and receive shares — but until you exercise, the company doesn’t owe you stock.

That means the cliff also gates your right to exercise. On day 364, you have zero exercisable options. On day 365, you can exercise 25% of the original grant. If you exercise immediately at the cliff, you start the QSBS holding-period clock for that batch of shares (relevant for the QSBS Section 1202 exclusion) and lock in your basis at the strike price.

For restricted stock units, vesting and ownership are simultaneous — when an RSU vests it converts to shares automatically (and creates a taxable event in the US). The cliff in an RSU grant means no shares are delivered at all until you cross it.

Modeling cliffs in a cap table

When a startup is modeling exit waterfalls, every employee grant carries a pre-cliff and post-cliff vested-share count at the modeled exit date. The cliff matters in two scenarios:

• Early-stage exits. A company that exits at month 18 has unvested options that don’t accelerate (assuming no change-of-control acceleration clause). Those unvested shares stay with the option pool and don’t dilute the proceeds.
• Departed employees with PIIN windows. US plans typically give terminated employees 90 days to exercise vested options. Pre-cliff departures have nothing to exercise. Post-cliff departures who don’t exercise within the window forfeit the vested portion too.

Both effects matter when sizing the fully-diluted vs vested-only view of a cap table during a financing or exit process.

Frequently asked questions

What’s the standard cliff for startup employees?

One year, paired with four-year total vesting and monthly vesting after the cliff. This is the YC-standard schedule and what virtually every US-seeded startup uses for employees.

What happens if I’m fired one day before my cliff?

You get zero vested shares. The cliff is binary: cross it and 25% vests, miss it and nothing does. Some companies negotiate a partial-cliff acceleration in senior hires’ offer letters, but it isn’t standard.

Do founders have cliffs?

Sometimes — investors typically require founders to have vesting on their own founder shares as part of a Series Seed or Series A. Founder vesting often uses a four-year schedule with no cliff (since the founders have already proven commitment) or a shorter cliff. The structure is negotiated case-by-case.

Can a company waive my cliff if I’m leaving?

Technically yes — the board can accelerate vesting at their discretion — but it’s rare unless the departure is friendly (e.g. a senior executive transitioning to an advisor role) or the offer letter includes a specific acceleration trigger.

Is the cliff calculated from the grant date or the start date?

Almost always from the vesting commencement date, which is typically the employee’s first day of work — not the date the board approved the grant (which can be weeks later). If you start October 1 and the board approves the grant November 15, your cliff still hits the following October 1.

What’s a “double-trigger” cliff acceleration?

A clause that fully (or partially) vests an employee’s grant if both a change-of-control occurs (acquisition, IPO) and they’re terminated without cause within a defined window after closing. It’s standard for founders and senior executives, less common for individual contributors.

Do RSUs have cliffs?

Yes. RSU grants typically use the same one-year cliff structure as options. The only difference is that vested RSUs convert immediately to shares (and create a taxable event), whereas vested options need to be exercised.