How should my co-founder and I split equity, and is 50/50 a mistake?
The short answer
Split on the future, not on who showed up first. Equal-ish splits are fine when both partners are full-time and equally committed, but a hard 50/50 with no tie-breaker is dangerous because it deadlocks every hard decision. Give one person a symbolic tie-breaker (51/49 or a designated CEO whose vote wins) and vest everything over 4 years. Never split based on 'my idea,' since ideas are worth almost nothing before execution.
Go deeper, your way
3 hand-picked resources, 3 link-checked. Pick how you want to dig in.
✍️ Essay
✓ Link checkedFreeBeginner
Why we picked it
This is the essay to read first, from a YC partner who co-founded Justin.tv/Twitch and has done equal splits across his own startups. It makes the honest case that early contributions are a tiny sliver of a 7 to 10 year build, so an equal split plus vesting protects the friendship better than haggling over who did more in month one. It is the clearest short answer to 'how do we split this without a fight later.'
Default to an equal split: the value is almost all in the years ahead, not in who wrote the first line of code, and a lopsided early split kills motivation when you need it most.
The real protection against a later fight is a 4 year vesting schedule with a 1 year cliff, so anyone who walks in year one leaves with nothing and the equity stays with whoever actually builds the company.
Have the awkward conversation now, on paper, rather than discovering the disagreement two years in when there is real value on the table.
Why we picked it
The first-hand cautionary tale our answer needs. Kwan went 50/50 across two startups over nine years, put in 100k of her own savings, took loans, skipped her salary, and ran BD, sales, and ops while her technical cofounder drew a steady paycheck and coded. When the company sold, the equal split paid him more for less risk, and the resentment ended the friendship. Her fix is exactly our tie-breaker instinct: a 10-minute conversation naming who actually owns what, then splitting on that.
Why we picked it
The India edge on paper. It states plainly that "equal splits are often unfair," then does what the US pieces skip: it turns our tie-breaker advice into an actual clause set for an Indian Pvt Ltd or LLP, voting protocols, deadlock provisions, and mediation/arbitration for when two founders lock horns, plus the 4-year, 1-year-cliff vesting. A handshake 50/50 is not a founders agreement; this shows you what the document that prevents the deadlock actually contains under Indian contract law.
