Stock Option Cliff Vesting Explained: The Dates to Know

Vesting is the schedule on which equity you have been promised actually becomes yours. A cliff is a period at the start of that schedule during which nothing vests — and then, on one specific day, a large chunk vests at once.

The standard shape is four years with a one-year cliff. Nothing for twelve months. On the first anniversary, 25% vests in a single step. The remaining 75% then vests monthly or quarterly over three years.

Why the cliff exists

It protects the company from giving equity to someone who leaves in month three. It also creates the single most consequential date in most employment contracts: leave on day 364 and you own nothing; stay to day 366 and you own a quarter of the grant.

Nobody warns you about this date. It is not in the offer letter headline. It is in the plan documents.

Worked example

You are granted 48,000 options at a $1.00 strike, four-year vest, one-year cliff, monthly thereafter.

You leave at	Vested options	What you own
Month 11	0	Nothing
Month 12	12,000	25% of the grant
Month 24	24,000	Half
Month 30	30,000	62.5%
Month 48	48,000	All of it

If the shares are worth $6.00 when you leave at month 30, your 30,000 vested options carry $180,000 of value against a $30,000 exercise cost. Which brings you to the clause that actually decides whether you keep any of it.

The exercise window: the term nobody reads

Vested options are not shares. They are the right to buy shares at the strike price. When you leave, a clock starts — the post-termination exercise period — and if you do not exercise before it expires, the options are cancelled.

The default in most plans is 90 days.

Ninety days to find $30,000 in cash, pay it to a private company for shares you cannot sell, and often trigger a tax charge on the paper gain in the same year. For many people that is impossible, and the equity they spent two and a half years earning simply evaporates.

This is not an edge case. It is the standard outcome for people who leave private companies before an exit.

What to ask for: an extended exercise window. Ten years from grant, or at least five years from termination, is increasingly offered by companies that want to be seen as fair. It costs the company nothing in cash and is one of the most valuable terms you can negotiate.

The other terms in the plan documents

Acceleration. What happens on a change of control — see the acceleration guide.

Good leaver / bad leaver. Whether vested equity survives depends on why you left, and the definitions are often reused in a settlement agreement. Check how widely "bad leaver" is defined; some plans include ordinary resignation.

Repurchase rights. Some plans let the company buy back your vested shares on departure, sometimes at the price you paid rather than fair value. This can undo the entire grant.

Cliff restart on promotion. Rare but real: check that a new grant is additive and does not reset the schedule on the old one.

Dilution. Your percentage is of today's cap table. Future rounds dilute it unless you have anti-dilution protection, which employees essentially never do.

The questions to ask before you accept

1. How many shares are outstanding on a fully diluted basis? (A number of options means nothing without the denominator.)
2. What is the strike price, and what was the last preferred price?
3. What is the post-termination exercise window?
4. Is there acceleration on a change of control, and is it single or double trigger?
5. How is "bad leaver" defined?
6. Can the company repurchase vested shares, and at what price?

Ask all six in one message, before signing. Afterwards you have no leverage.

FAQ

What is a vesting cliff?

A period at the start of a vesting schedule during which no equity vests, followed by a single date on which a large tranche vests at once. Twelve months with 25% vesting on the anniversary is the standard shape.

What happens if I leave one day before my cliff?

You keep nothing. Vesting is binary at the cliff date. If you are within weeks of it, the arithmetic of staying is usually overwhelming — and if you have been asked to leave, moving your termination date past the cliff is a reasonable thing to negotiate.

What is a post-termination exercise window?

The period after you leave in which you can still buy your vested options. The common default is 90 days, after which unexercised options are cancelled. It is the reason many people with substantial vested equity end up with nothing.

Can I negotiate a shorter cliff?

Occasionally, more often at smaller companies or for senior hires — six months instead of twelve, or a cliff that only applies to the first grant. It is a less common concession than an extended exercise window, which is usually the more valuable ask anyway.

Does vesting continue during garden leave?

It depends on whether the plan measures vesting to the termination date or to the date active duties cease. This is worth checking explicitly, because a long garden leave can otherwise sit either side of a vesting date.

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