What is an ESOP? A guide to employee stock options
How an employee option pool works, how much to reserve, vesting and cliffs, the exercise process and what startups should watch.
By Editorial Team
Early-stage startups cannot compete with large companies on salary, but they can attract talent by sharing the company's future. An ESOP (employee stock option pool) is the most common way. Legal and tax details vary by country, so get expert help before implementing.
What is an ESOP?
An ESOP reserves part of the company's shares as options for employees to buy shares at a set price in the future. The employee is not a shareholder today; if conditions are met, they earn the right to buy shares later.
How big should the pool be?
In funding rounds the pool is typically planned at 10–20% of the post-investment company. The real figure depends on how many people and which roles you will hire. Investors often ask for the pool to be created pre-investment, which dilutes founders. See the cap table guide.
Vesting and cliff
- Vesting: Options typically vest gradually over 4 years.
- Cliff: No options vest before the first year; at 1 year, 25% of the total vests.
- Monthly or quarterly vesting then continues.
The same logic applies to founders; see the founders' agreement.
Who gets how much?
- Early employees and key roles get larger grants.
- Grants depend on the role's impact, joining time and market benchmarks.
- Every employee receives a written option agreement.
For hiring strategy, see our first employees guide.
How to explain it to employees
Say clearly that option value is not guaranteed and may become real only at an exit such as a sale or IPO. Managing expectations honestly protects trust.
What happens on exit?
When an employee leaves, they usually get a window (for example 90 days) to exercise vested options; unvested ones return to the pool. Write these terms up front.
Common mistakes
- Making the pool too small or not creating one
- Not applying vesting
- Not giving option terms in writing
- Not informing employees about tax and valuation
For perks beyond salary and for culture, see our startup culture guide.
This guide is for general information only and is not legal, financial or investment advice. Check official sources and consult professionals for current terms.
