Guide · EasyCofounder
Co-founder vesting: how it works and how to set it up
Vesting protects a founding team against the most common early-stage accident: a co-founder who leaves after a few months but keeps a large slice of the company. This guide explains the mechanics, the vocabulary and the decisions to make together. Legal setups vary by country, so treat it as a starting point for a conversation with a lawyer.
Updated on 6 min readBy the EasyCofounder team
In short
Co-founder vesting means each founder earns their shares progressively instead of owning them all on day one. The common convention is four years with a one-year cliff: nothing vests in the first 12 months, then a quarter vests at once and the rest monthly. If a founder leaves early, the company or the other founders can buy back the unvested shares.
Contents
- What is vesting for co-founders?
- How does a 4-year vesting schedule with a 1-year cliff work?
- What are good leaver and bad leaver clauses?
- What is vesting acceleration?
- How do you set up vesting for co-founders?
- What vesting mistakes should co-founders avoid?
- Frequently asked questions
- Glossary
- About this guide
What is vesting for co-founders?
Vesting is a mechanism that ties ownership to time spent building the company. Instead of keeping all their equity whatever happens, a co-founder “earns” it month after month while they remain involved.
Without vesting, a founder who walks away in month six still owns the same percentage as the partners who carry on for years. That imbalance is unfair to those who stay, and it is a red flag for future investors, who see a large stake held by someone no longer contributing.
It works hand in hand with the equity split itself: first decide who holds what (see how to split equity between co-founders), then decide how those shares are earned over time.
How does a 4-year vesting schedule with a 1-year cliff work?
The most widespread convention in startups is a four-year schedule with a one-year cliff. It is a convention, not a legal requirement: teams can adapt the duration, the cliff and the frequency.
| Time since start | Share of founder equity vested | What happens |
|---|---|---|
| 0–11 months | 0% | Nothing is vested yet: this is the cliff period |
| 12 months | 25% | The cliff is reached: a full year vests at once |
| 13–47 months | + about 2.08% per month | The remaining shares vest monthly (or quarterly) |
| 48 months | 100% | All shares are vested |
Lena and Omar each hold 50% of their startup, with four-year vesting and a one-year cliff. After 18 months, Omar leaves to take a job elsewhere. He has vested 25% at the cliff plus six months of monthly vesting, i.e. 37.5% of his shares. The remaining 62.5% of his shares can be bought back under the terms agreed in advance.
What are good leaver and bad leaver clauses?
Vesting tells you how many shares a departing founder keeps. Leaver clauses tell you at what price the unvested (and sometimes vested) shares are bought back, depending on the circumstances of the departure.
| Category | Typical situations | Usual consequence |
|---|---|---|
| Good leaver | Illness, death, departure agreed by the board, sometimes dismissal without cause | Unvested shares bought back, often at fair market value |
| Bad leaver | Resignation in breach of commitments, serious misconduct, breach of non-compete | Shares bought back at a reduced price, sometimes nominal value |
| Intermediate leaver | Voluntary resignation without misconduct (in some agreements) | A price between the two |
The definitions are what founders argue about later, so write them precisely. A vague “bad leaver in case of misconduct” clause leaves room for dispute; list the situations explicitly.
What is vesting acceleration?
Acceleration means some or all unvested shares vest early when a specific event occurs, usually the sale of the company.
- Single trigger: shares vest early as soon as the company is acquired.
- Double trigger: shares vest early only if the company is acquired AND the founder is then dismissed or sees their role substantially reduced within a set period.
Double trigger is generally more acceptable to buyers and investors, since an acquirer usually wants the founders to stay on after the deal. Single trigger protects founders more but can make the company less attractive to acquire.
How do you set up vesting for co-founders?
In most countries founders receive their shares outright when the company is incorporated. Vesting is then usually implemented as reverse vesting: the founder owns the shares from day one, but the company or the other shareholders have a right to buy back the unvested portion if they leave.
- 1Agree on the principle and the parameters: duration, cliff, vesting frequency, start date.
- 2Decide what happens on departure: good, bad and possibly intermediate leaver, and the buyback price for each.
- 3Decide on acceleration, if any (single or double trigger).
- 4Have a lawyer draft the clauses in the shareholders’ agreement or the company’s articles, depending on what your jurisdiction allows.
- 5Have every founder sign before significant work or investment begins.
The shareholders’ agreement is the natural home for these clauses: see what to put in a shareholders’ agreement.
What vesting mistakes should co-founders avoid?
- Applying vesting to only one founder: it feels unfair and breeds resentment.
- Waiting until the first conflict to raise the topic: it is far easier to agree while everyone is getting along.
- Leaving the leaver definitions vague.
- Forgetting to credit time already worked before incorporation, if the team agrees it should count.
- Copying a template without adapting it to your local law.
Frequently asked questions
Is 4-year vesting with a 1-year cliff mandatory?
No. It is a widespread convention in startups, not a legal rule. Teams can choose a different duration, a shorter or longer cliff, or quarterly rather than monthly vesting, as long as all founders agree and it is properly documented.
Can vesting start before the company is incorporated?
Many teams agree that the vesting start date reflects when full-time work actually began, which can be before incorporation. Whether and how that is possible depends on your jurisdiction, so check with a lawyer.
What happens to my shares if I leave before the cliff?
Under a standard cliff, nothing has vested yet, so the company or the other shareholders can buy back all your shares under the conditions set out in the agreement, typically at a price that depends on whether you are a good or bad leaver.
Do investors require founder vesting?
It is common for investors to ask for founder vesting, or to reset it, when they invest, because it reassures them that the team is committed. The exact terms are negotiated.
What is the difference between vesting and reverse vesting?
With classic vesting, you receive shares or options progressively. With reverse vesting, you own the shares from the start, but the unvested portion can be bought back if you leave. For founders, reverse vesting is the most common approach.
Should the founder who had the idea be exempt from vesting?
Generally not. Vesting rewards ongoing commitment, and the idea alone rarely builds a company. Exempting one founder tends to create tension and may worry investors.
Glossary
- Vesting
- Progressive acquisition of shares or rights over time, conditional on remaining involved in the company.
- Cliff
- Initial period during which nothing vests; at its end, the whole period’s portion vests at once.
- Reverse vesting
- Setup in which founders own their shares immediately but the unvested portion can be bought back if they leave.
- Good leaver / bad leaver
- Clauses that set the buyback price of a departing founder’s shares according to the circumstances of their departure.
- Acceleration
- Early vesting of unvested shares triggered by an event, usually the sale of the company (single or double trigger).
Find a committed co-founder
Verified profiles and AI matching to build a team that lasts
Further reading
- Equity splitSplitting equity between co-founders: criteria, worked reasoning, vesting, cliff and common mistakes. Pointers to start the conversation on the right foot.
- Shareholders’ agreementShareholders’ agreement: what it is for, how it differs from the articles of association, common clauses between co-founders and when to sign it.
- Find a co-founderHow to find a co-founder for your startup: CTO, CEO and COO profiles, where to look, how to choose, equity and the mistakes to avoid.
- Founder salaryHow startup founders pay themselves: unpaid at first, salary vs dividends, when to start a salary, pay after fundraising and equal pay among co-founders.
About this guide
This guide was written by the EasyCofounder team — a platform that connects founders, talents and startups (a service by IRPEA) — and was last updated on November 4, 2026. It draws on common startup practice and on the questions our members ask.
It provides general guidance and is not legal, tax or financial advice. For your own situation, consult a qualified professional (lawyer, accountant) and the official resources available in your country.