Co-founders and how to split equity

Why does the split matter so much?

Equity is ownership. Every share a founder holds is a claim on future profits and on the proceeds of a sale. Splitting it badly is one of the most common reasons founding teams break up, and a dispute inside a founding team is something investors see as a serious warning sign. A fair split that everyone understands keeps people motivated through years of hard work and low pay.

There is no formula that is correct for every team. What helps is a conversation held early, with all numbers written down, and a willingness to revisit it if roles change before outside money comes in.

Should the split be equal?

Equal splits are common among founders who start together, because they feel fair and avoid awkward talks. They work when everyone will put in similar time, risk and skills for years. They go wrong when one founder is full time and another keeps a day job, or when one founder brings money or a key skill and the others do not.

Some founders prefer unequal splits that reflect roles, such as a larger share for the person who is chief executive or who carries more risk. Both approaches can work, as long as everyone agrees, understands the reasons and feels the deal is fair when they imagine the company becoming successful.

What factors should you weigh?

Consider the following when deciding who gets what.

The main factors are listed below, and no single one should decide the split.

• Time: is each person full time, and for how long will they commit?
• Idea and early work: how much was built before the company existed? Counted, but usually weighted less than future effort.
• Skills: is the person hard to replace, such as the lead engineer or a founder with a critical network?
• Money: does anyone put in cash? A loan to the company is better than extra equity in many cases.
• Role and risk: who quits a job, who guarantees what, and who is the public face?
• Future contribution: what will each person do over the next four years?

What is vesting and why do founders use it?

Vesting means founders earn their shares over time instead of owning them all on day one. A common arrangement is four years with a one-year cliff: nothing vests during the first year, then a quarter vests at the cliff, and the rest vests monthly or quarterly over the following three years. If a founder leaves at month eight, they leave with nothing from the vested schedule, and the company can buy back the unvested shares.

Investors usually ask for founder vesting, since they are backing the team's commitment. It also protects the remaining founders. Setting it up yourselves, before any investor asks, shows maturity. The detailed mechanics are covered in the guides on vesting and founder vesting.

What about the ESOP pool and early hires?

Plan for the future team as well. Companies usually set aside a pool of shares, often in the range of ten to fifteen percent, for employee stock options. The pool is created before or at the first major funding round and dilutes the founders, not the investors in many deals. Think about this when you split your own shares, because the number you hold today will shrink.

Advisers and early supporters sometimes receive small stakes, but be careful: giving away equity for vague help is a common mistake. Prefer to link any grant to clear tasks and vesting.

What should be written down?

Put the agreement in a founders' agreement or shareholders' agreement signed by everyone. It should cover each founder's role and time commitment, the share split, vesting, what happens if someone leaves, how decisions are made, who owns the intellectual property and how a dispute will be resolved. Every founder should assign the ideas and code they create for the company to the company in writing.

Verbal promises are the cause of most founder disputes. This is general information, not legal advice, so have a lawyer draft or review the document.

What mistakes should you avoid?

Avoid deferring the conversation, giving equity before you know a person well, giving a large stake for a small contribution, or leaving no way to remove a founder who stops working. A common practical step is a short trial period of a few months before locking the split.

Also avoid splitting purely by who has the idea. Ideas are common; the work of carrying them out for years is what builds the company.

How do you choose a co-founder?

Treat the choice like a long working marriage. Look for a person you trust, who is strong where you are weak, and who has the same view on risk, ambition and money. Work together on a small project first, even for a few weeks, because how someone behaves under pressure tells you more than an interview.

Check references, talk about what each of you wants in five years, and discuss hard topics early: what happens if the company does not raise money, if one person needs a salary, or if you disagree on strategy. Founders who skip these questions often meet them later at a bad time.

How does equity change when investors join?

Each time the company raises money, new shares are issued, and existing holders own a smaller percentage. This is called dilution. A founder who holds 40% today might hold closer to 30% after a seed round and an ESOP pool, and less after later rounds. The company is worth more, so a smaller share can still be worth much more in rupees.

Investors look at the founding team's split to judge commitment and clarity. A very lopsided split, or a missing founder who holds a large stake but does no work, is a common reason for investors to ask for changes. It is easier to agree on a sensible split before the first cheque than to repair one under pressure.

Roles often shift. A founder who started in sales may become the head of operations, and one may be asked to step back. Build flexibility into your agreement by deciding who has the final say in each area, by reviewing roles every year, and by agreeing in advance how a founder's departure will work, including whether the company or the other founders may buy back vested shares and at what price.

Good leaver and bad leaver terms help here. A good leaver, who leaves for a reason such as illness or a mutual decision, may keep what has vested. A bad leaver, who breaks the agreement, may lose some of it. Having these terms agreed in writing avoids heated arguments later. Share this document with an adviser so that it reads clearly to someone outside the team.

Finally, revisit the arrangement as the company grows. A split that felt fair at the start can feel off after two years if contributions changed. Talk about it openly, keep the legal documents up to date, and make changes before a funding round rather than during one, when everyone is under pressure and investors are watching how the team handles the question.

Keep the discussion calm and factual, and write down what you agree.

If you cannot agree, bring in a trusted mentor or adviser to talk it through. A neutral outside view can help founders see which factors matter most and settle on a split that everyone can live with.

Remember too that a fair split is one every founder can explain to a new hire or an investor without embarrassment. If you would struggle to justify the numbers out loud, revisit them now, while changing them is still cheap.

Read next

• Dilution: why founders own less after every round
• What is a cap table?