How to split equity with a cofounder without ruining the friendship

There's no formula that makes an equity split feel fair to everyone. There is a process that makes it feel considered — and that matters more when things get hard.

Decide what you're rewarding

Most of a startup's value is created after day one, so a split that only rewards who had the idea tends to age badly. Look forward instead: who is committing full-time, who is taking the bigger pay cut, and whose skills the next two years depend on.

Equal splits are a reasonable default

When founders join at roughly the same time with roughly the same commitment, an even split removes a source of resentment. Weighted splits make sense when one founder has already put in substantial work or capital, or is joining part-time. To structure the conversation, score each founder in the free equity split calculator.

Always use vesting

A common structure is four years with a one-year cliff, so equity is earned over time and a founder who leaves early doesn't walk away with a large stake. It protects every founder, including you. The vesting calculator shows what each founder would keep at any month.

Write down roles and decision rights

Who has the final say on product, on hiring, on fundraising? What happens if someone wants to leave, or stops pulling their weight? Agreeing these in calm conditions is far easier than in a crisis — our cofounder agreement checklist covers what to include.

Have the conversation before you commit

That's why Cofounder for Startups asks both sides to state equity expectations on their profile: you only match with cofounders whose expectations are already in range. This is general information, not legal or tax advice; have a lawyer review your founder agreement.

The Cofounder for Startups team

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