Cofounder Trial Period: Test Before You Give Equity

Run a cofounder trial period before you commit equity: a defined stretch of real, paid work together, with a clear outcome and an exit agreed before you start. A trial does not replace vesting. It decides whether vesting is even the right next step, before you have given anything away.

Why test before you give away equity

Equity is close to irreversible. A vesting schedule slows it down, but by the time you are negotiating vesting you have already decided this person is your cofounder. A trial happens before that decision, while backing out still costs almost nothing. One guide to testing a cofounder before splitting equity puts it plainly: giving equity to someone you have never seen work under pressure is close to signing a blank check for the next several years.

How long should a cofounder trial period run

Recommendations vary, but most land in the same range. Slidebean's guide recommends a trial built around real work and a concrete deliverable, rather than a fixed calendar length on its own. A separate guide to finding a cofounder suggests running a trial project together for four to six weeks before signing anything, long enough to get past the honeymoon period where everyone is on their best behavior.

A reasonable default:

1. Thirty days for a narrow, well-defined project with daily contact.
2. Sixty to ninety days if the role is broader or the work is less structured.
3. A fixed end date either way, agreed before day one, not left open-ended.

What to actually test for

Skill is the easy part to check. What you actually need to know is how this person behaves when something goes wrong: do they tell you about a missed deadline the day it happens or the day you ask, do they take a decision and own the result, and do they ask for help when they are stuck rather than quietly struggling until it becomes your problem too. Give them something real to decide, not a test exercise, and watch what they do with it.

Pay attention to how they talk about the work when it is not going well. Someone who can say "this part is harder than I expected and here is my new plan" is showing you exactly the trait a long partnership depends on. Someone who disappears for a week and resurfaces with a vague update is showing you something too, and it is worth taking seriously before any equity is on the table, not after.

Watch how they handle a disagreement with you specifically, not just with the work. A trial with no friction at all has not actually tested anything. If you have not disagreed about a real decision by the end of it, manufacture one, deliberately, by asking them to make a call you would have made differently, and see how the conversation goes.

Pay for the trial if you can

Even a modest payment changes the shape of the arrangement. It signals this is a real engagement, not a favor someone is doing you, and it gives you a clean way to end the trial if it is not working: you close out a paid project, not a handshake deal that never had terms. Our cofounder agreement templates include language for exactly this kind of defined, paid trial arrangement.

Turning a good trial into a real partnership

If the trial goes well, do not let the partnership conversation drift the way the trial itself did not. Sit down and go through the questions you would ask any potential cofounder, equity, roles, decision rights, before you formalize anything. Our guide on questions to ask a potential cofounder and our cofounder compatibility test are both built for exactly this moment. And if you want a faster read on where you already agree, our cofounder alignment check is a reasonable next step before you draft anything formal.