How to Review a Startup Equity Agreement Before Signing

Quick Answer

A startup equity agreement is one of the most complex documents most people sign without fully understanding. The terms determine whether your equity is worth anything at all, when you can access it, and what happens to it if the company is sold, you leave early, or the startup raises another round.

The most important things to understand before signing:

• the type of equity being offered and what that means for ownership and tax treatment
• the vesting schedule and cliff, and what happens to unvested shares if you leave
• the exercise price and expiration window for options
• how dilution works and what protections, if any, exist
• what happens to your equity in an acquisition

If you want a fast first read on the agreement to understand which provisions deserve closest attention, AI contract review can flag unusual terms quickly.

Quick Decision Guide

Review more carefully if the agreement includes:

• a vesting cliff longer than one year without justification
• an exercise window of 90 days or less after leaving
• no acceleration on acquisition or double-trigger provisions
• a broad clawback right with vague triggering events
• preferred stock rights that could significantly dilute common stock value in a sale
• a right of first refusal that makes secondary sales effectively impossible

You are in a stronger position when the agreement includes:

• a standard four-year vest with one-year cliff
• a 10-year exercise window or extended window for long-tenured employees
• double-trigger acceleration on acquisition
• clear definitions of what events affect your equity
• clean, standard documentation using NVCA or similar standard forms

Types of Equity

Incentive stock options (ISOs)

ISOs are the most common form of equity compensation at early-stage startups. They give you the right to purchase shares at a fixed price. Tax treatment is favorable if you hold the shares long enough after exercising. ISOs can only be granted to employees, not contractors.

Non-qualified stock options (NSOs or NQSOs)

NSOs are taxed as ordinary income in the year you exercise them, regardless of whether you sell the shares. They can be granted to contractors and advisors as well as employees. Less favorable tax treatment than ISOs but more flexible.

Restricted stock units (RSUs)

RSUs are actual shares that vest over time, not options to purchase. They are taxed as ordinary income when they vest. More common at later-stage or pre-IPO companies. You do not need to exercise RSUs or pay an exercise price.

Restricted stock

Actual shares issued at a very low price, typically at founding or very early in the company. Often paired with an 83(b) election, which changes the tax treatment significantly. Missing the 83(b) election deadline (30 days from grant) is a costly and irreversible mistake.

Key Terms to Understand

Vesting schedule

Vesting defines when you actually earn your equity. A standard schedule is four years with a one-year cliff. The cliff means you receive nothing until 12 months of service, at which point you receive 25 percent of the total grant. After the cliff, vesting typically continues monthly or quarterly.

What to check: how long is the cliff, what happens to unvested equity if you are laid off or the company is sold, and whether there is any acceleration.

Exercise price (strike price)

For options, this is the price you pay to purchase the shares when you exercise. A lower exercise price relative to the current fair market value is better for you. The gap between exercise price and fair market value at exercise determines your economic gain.

The 409A valuation is the IRS-approved method for setting the exercise price of ISOs. If the exercise price is set below the 409A fair market value, there can be significant tax penalties.

Exercise window

After you leave the company, you typically have a limited window to exercise your options or they expire. Historically, 90 days was standard. This is now widely recognized as a problem because employees often cannot afford to exercise, especially if the company has grown and the tax bill on exercise is large.

Some companies now offer 5-year or 10-year post-termination exercise windows. This is a meaningful benefit worth asking about.

Cliff

The cliff is the minimum tenure required before any equity vests. If you leave before the cliff date, you typically receive nothing. One year is standard. Longer cliffs are worth negotiating.

Acceleration

Acceleration allows unvested equity to vest faster upon certain events. Two common types:

• Single-trigger: equity accelerates automatically upon an acquisition
• Double-trigger: equity accelerates only if there is an acquisition AND you are terminated or constructively terminated within a defined period after closing

Double-trigger is the more common and more equitable version in standard employment agreements. Single-trigger acceleration is harder to negotiate as a new employee but is more common for executives and founders.

Dilution

Every time the company raises a new funding round, more shares are issued. This reduces the percentage of the company your shares represent. The number of shares you own stays the same but your ownership percentage decreases.

What matters is your percentage ownership, not the number of shares alone. A pro rata right lets you invest in new rounds to maintain your percentage.

Liquidation preferences

Investors typically hold preferred stock with liquidation preferences. In a sale, preferred stockholders receive their investment back first, often with a multiple, before common stockholders receive anything. This means a startup can be sold for significant money while common stockholders, including employees with options or RSUs, receive little or nothing.

Understanding the company's cap table and liquidation stack is important context for evaluating how much your equity might actually be worth in an exit.

Quick Contract Review Checklist

Before signing an equity agreement, confirm you understand:

• what type of equity you are receiving and the tax implications
• your vesting schedule, cliff, and what vests early if the company is acquired
• the exercise price and current 409A valuation
• how long you have to exercise after leaving the company
• what percentage of the company your equity represents today
• how the cap table looks and what liquidation preferences exist above you
• what happens to your equity if you are laid off, if you resign, or if the company is sold

The glossary has plain-English definitions for vesting, dilution, liquidation preference, and related terms that appear in these agreements.

What to Ask Before Signing

These are reasonable questions to raise with any startup before accepting an equity offer:

• What is the total number of shares outstanding and fully diluted?
• What is the most recent 409A valuation?
• What is the current preferred liquidation stack?
• What is the strike price on my options and how was it set?
• What is the post-termination exercise window?
• Is there any double-trigger acceleration?
• Have any employees exercised options recently and at what price?

Most startups will answer these questions if asked directly. Reluctance to provide basic cap table information before signing is worth noting.

FAQ

Do I have to pay taxes when I exercise stock options?

It depends on the type. With ISOs, there is generally no regular income tax at exercise, but the spread between the exercise price and the fair market value is an AMT preference item. With NSOs, the spread is taxed as ordinary income in the year of exercise. Consult a tax professional before exercising a large option grant.

What is an 83(b) election?

An 83(b) election is a tax filing that treats restricted stock as income at the time of grant rather than as it vests. It must be filed within 30 days of the grant date. If the shares are worth very little at grant, an 83(b) election can lock in a very low tax bill. If the company grows, the difference in tax treatment can be enormous.

What happens to my unvested options if I am laid off?

Unvested options typically are forfeited if you leave, whether voluntarily or involuntarily, unless there is an acceleration provision. If you are laid off as part of an acquisition and have double-trigger acceleration, unvested equity may vest upon termination. Check the specific agreement language.

Can I negotiate equity terms?

Yes, particularly at earlier-stage companies. Exercise window length, acceleration provisions, and cliff duration are the most common negotiation points for employees. Senior hires have more leverage than junior ones, but asking professionally is rarely penalized.

What is a right of first refusal on secondary sales?

Many equity agreements include a right of first refusal (ROFR) that gives the company the right to buy your shares before you can sell them to a third party. Combined with information asymmetry about valuation, this can make it very difficult to sell shares on secondary markets even when the company is doing well.

The Bottom Line

Startup equity agreements require more careful reading than almost any other document most people sign. The type of equity, the vesting mechanics, the exercise window, and the liquidation structure together determine whether the equity is genuinely valuable or largely theoretical.

The most important things to verify before signing are the vesting schedule, the exercise window after departure, whether acceleration exists for acquisition events, and what the cap table looks like relative to your equity. An agreement that looks generous in number of shares can be worth very little in practice if the structure is unfavorable.

Start with AI contract review to understand which terms in your specific agreement are unusual or worth flagging, check pricing to see how to fit a quick review into the process, and browse use cases to see how others approach high-stakes agreements.