Equity Vesting and Cliff Clauses: What Your Options Are Worth and When

The Standard Vesting Schedule and Why It Exists

The most common equity vesting schedule in US startups and tech companies is four years with a one-year cliff. This means you earn your equity over four years, but you do not receive any of it until you have been employed for exactly twelve months — the "cliff." After the cliff, the remaining equity typically vests monthly or quarterly over the following three years.

The cliff serves the employer's interest: it ensures you stay at least a year before receiving any equity compensation. If you leave in month eleven, you receive nothing — zero. Once you pass the cliff, you begin accumulating shares on a regular schedule. This structure creates a strong retention incentive for the first year and a steady accumulation thereafter.

For employees, understanding the cliff is critical before accepting an offer or making a departure decision. Leaving two months before your cliff date costs you the entire first year's worth of equity. That can represent tens of thousands or hundreds of thousands of dollars at a well-performing company. Timing your departure — or negotiating for vesting acceleration — can dramatically affect your financial outcome.

What Happens to Your Equity If the Company Is Acquired

An acquisition is when vesting terms matter most — and when most employees discover they negotiated them badly. When a company is acquired, unvested equity can be treated in several ways: (1) assumed by the acquirer, continuing on the original schedule; (2) accelerated, meaning all unvested shares vest immediately; or (3) cancelled, meaning you receive nothing for unvested shares.

Which outcome you get depends on your employment agreement and the terms of the acquisition. Single-trigger acceleration means your equity accelerates on the acquisition event alone. Double-trigger acceleration requires both (1) an acquisition and (2) a qualifying termination — being laid off, having your role significantly changed, or being required to relocate. Double-trigger is more common and is considered the employee-friendly standard.

If your contract has no acceleration clause, the default is continuation — your equity converts to acquirer equity and continues vesting normally. This sounds neutral, but if the acquirer eliminates your role six months after closing, you lose everything that was not already vested. This is why negotiating for double-trigger acceleration before you join is so important, particularly at acquisition-stage startups.

Stock Options vs. RSUs: The Mechanics That Matter

Stock options give you the right to buy shares at a fixed price (the "exercise price" or "strike price"). If the company's stock is worth more than your strike price when you exercise, the difference is your gain. If the company's valuation declines below your strike price, your options are "underwater" and worth nothing. Options also come with an expiration — typically ten years from grant, or ninety days after you leave (a window that has caused enormous financial loss for employees at startups that exit years after their last employee departure).

RSUs (Restricted Stock Units) are simpler: they are promises to give you actual shares when they vest. There is no exercise price; you simply receive the shares, which are taxed as ordinary income at vesting. RSUs are more common at public companies because the value is clear — you can sell the shares to pay the tax. At private companies, RSUs create a tax liability without liquidity, since you cannot sell private shares.

For stock options, ask about the post-termination exercise window. Many companies default to ninety days — meaning if you leave, you have three months to buy your vested options or lose them permanently. Some companies have extended this to two or five years or until the option's expiration date. The ninety-day window forces departing employees to come up with cash to exercise (or lose their equity), often at a time when they can least afford it.

Negotiating Equity Terms Before You Sign

Before accepting an equity grant, ask for: (1) the total number of shares outstanding (fully diluted), so you can calculate your ownership percentage rather than being dazzled by a share count with no context; (2) the most recent 409A valuation, which gives you the fair market value of a single share; (3) the most recent preferred stock price from the last funding round, which tells you what investors paid per share; and (4) the liquidation preference stack, which tells you how much money goes to preferred shareholders before common shareholders (like you) see any proceeds in an acquisition.

Negotiate for: double-trigger acceleration in any acquisition scenario; extension of the post-termination exercise window beyond ninety days; the right to early-exercise (which allows you to start the capital gains clock before vesting, potentially reducing your tax liability significantly); and transparency about dilution expectations in future fundraising rounds.