What a one-year cliff means for equity

Cliff vesting explained in one sentence: little or none of a grant becomes non-forfeitable until a first milestone date, often negotiated as one year of continuous service, and only then does the remaining schedule continue in smaller steps. A one-year cliff is common market practice in startup equity documents; it is not a statute. The SEC notes that vesting conditions may include length of employment or performance metrics. This post zooms on the cliff itself: founder versus employee patterns, offer-letter wording, refresh grants, leavers around the cliff date, and what acquisitions do to unvested time. For the full schedule anatomy, section 83 timing, and Cap Table recording steps, read the companion draft How founder vesting schedules usually work (same backlog; not repeated here). Operator labels for instruments live in Cap Table. This is orientation for founders, not legal or tax advice. Confirm cliff length, leaver outcomes, and deal language with counsel.

Read the grant before you quote a percentage

On grant day you may receive or be promised shares or options, but the cliff says the first substantial vesting event waits until the cliff date if service conditions are met. Leave before that date under a typical time-based cliff and unvested equity is usually forfeited or repurchased under the agreement. Cross the cliff while still meeting the service definition and a defined first slice vests; the rest continues on the post-cliff cadence written in the contract.

Illustrative reading (composite only): 1,000,000 founder shares, one-year cliff, then monthly vesting through year four. At month eleven, none of the time-based cliff slice is vested yet. The day after the cliff date, the first block vests if service continued.

Do not confuse "issued" with "vested." When a slide says a founder "owns" twenty percent, ask whether that figure is issued, fully diluted, or vested. Cliff vesting explained carefully always answers that follow-up with the agreement dates, not with a round number from memory.

Pre-cliff, cliff day, and after: one timeline

Fill this from your documents. Replace example lengths if your cliff is not one year.

Illustrative timeline (composite only): cliff on the first anniversary of the vesting commencement date; 25% vests at cliff; the other 75% vests in equal monthly installments over the next thirty-six months. Your fractions may differ; only the agreement controls.

Put the cliff date on a shared calendar with a reminder thirty days earlier for service-status checks. If the company wants a different first-block size than twenty-five percent, change the paper with counsel rather than rounding in a slide.

Cliff vesting explained for founders versus employees

Founder cliffs and employee cliffs often share the one-year label and still diverge on commencement, credit for past work, and who negotiates them.

Founders frequently measure from incorporation, a vesting commencement date that may predate the RSA signature, or a board-approved backdate for work already done. Employees usually measure from hire date or first day of service. Mintz and Manatt both describe the familiar four-year schedule with a one-year cliff as common practice for founder stock; that pattern is market custom, not a required statute. Co-founders on the same company can still hold different cliffs when roles or contribution timing differ.

Employee cliffs sit inside the option or RSA grant that follows the offer. The offer letter may preview "standard four-year vesting with a one-year cliff," but the grant notice and plan documents control. If the letter promises a cliff start on a date the grant later changes, counsel should reconcile the paper before anyone starts counting months.

Illustrative contrast (composite only): Founder A has a cliff measured from incorporation with six months of credited service already reflected in the commencement date. Employee B's cliff starts on the first day of employment one year later. Same "one-year cliff" phrase; different calendars.

When investors ask whether founders are subject to a cliff, answer from each RSA, not from a company-wide slogan. Use the same precision you use in other investor follow-ups.

Offer-letter wording that makes the cliff enforceable

Vague marketing language in an offer creates disputes the grant was meant to avoid. Aim for words counsel can map to the equity plan.

Illustrative offer excerpt (composite only): "Subject to board approval, you will be granted options covering N shares under the company's equity plan, vesting over four years with a one-year cliff measured from your start date." That sentence still needs the grant notice to name N, the strike price path, and the cliff date.

Do not treat the offer as a substitute for the RSA or option agreement. If the letter and the grant disagree on commencement, stop counting days until counsel issues a conforming amendment or a corrected notice.

Leavers just before and just after the cliff

Two dates create most disputes: the day before the cliff and the day after.

Before the cliff, a departure typically leaves the unvested portion subject to the agreement's forfeiture or repurchase terms. After the cliff, the vested slice is usually treated differently from the still-unvested remainder. Cause, good reason, disability, and death definitions can change outcomes; only counsel should apply those labels to a fact pattern.

Illustrative contrast (composite only): departure one week before the cliff with no special acceleration leaves the cliff block unvested; departure one week after with continuous service leaves the cliff block vested and the rest still on schedule.

Do not invent acceleration to "be fair" in Slack. If the company wants a different outcome, amend with counsel and board action as required. Keep a short leaver checklist: last service day, vested shares per counsel, repurchase or forfeiture notice if any, and where the termination paperwork lives.

For options, confirm the post-termination exercise window. For restricted stock, confirm repurchase price and notice period. Those details sit in the agreement, not in a blog average.

Refresh grants and a second cliff

A refresh grant is a new award. It can carry its own cliff even when the original grant already cleared its first anniversary.

Companies use refreshes to retain people whose early grant is mostly vested, to reward a promotion, or to reset incentives after a financing. Cliff vesting explained poorly treats every share as sharing one company cliff. In practice, each grant notice has its own commencement and cliff unless counsel expressly ties them together.

Illustrative path (composite only): an employee clears the year-one cliff on the hire grant in June; a December refresh of new options starts a fresh one-year cliff on the new shares only. Leaving in the following May can forfeit the refresh cliff block while leaving the already-vested hire-grant slice intact under the hire agreement.

When you approve a refresh, write whether the new cliff measures from the refresh grant date, from a promotion date, or from another commencement counsel chooses. Tell operators which calendar to watch so they do not apply the old cliff to the new shares.

What happens to a cliff in an acquisition

An acquisition does not automatically wipe or honor a cliff. The stock purchase agreement, option plan, and individual grant language decide whether unvested equity accelerates, continues, is assumed, or is cashed out.

Manatt describes two common acceleration patterns for founder stock: single-trigger acceleration (often on change of control alone) and double-trigger acceleration (change of control plus a qualifying termination without cause or resignation for good reason within a defined window). Mintz makes the same single- versus double-trigger distinction and notes that single-trigger vesting on sale can raise buyer retention concerns. A public SEC filing example of founder vesting shows double-trigger style acceleration within eighteen months after a change of control when involuntary termination or termination without cause occurs and a release is signed. The NVCA publishes model venture financing documents that companies and counsel adapt; acceleration and change-of-control definitions still belong in your negotiated paper, not in a blog summary.

Ask counsel three cliff-specific deal questions before you celebrate a LOI:

1. If closing happens before the cliff date, does any acceleration waive the cliff, leave it in place, or pro-rate service through closing?
2. If awards are assumed by the buyer, do commencement and cliff dates carry over or reset?
3. If awards are cashed out, is the unvested cliff block included, excluded, or paid on a deferred retention schedule?

Illustrative deal note (composite only): closing six months before a founder cliff with no acceleration language leaves the repurchase right intact unless the merger agreement or a separate amendment says otherwise.

Cliff vesting explained well ends when each grant's cliff, each refresh, and any deal acceleration language match what you say aloud to co-founders, employees, and investors. When those diverge, stop quoting percentages until the documents match again.