I love advising early-stage startups. A question I get frequently is “how to formalize bringing a co-founder on board.” I could write a book on the topic, but it’s really much simpler than that.
Here’s how you do it in one tweet:
@joe I expect this co-founder position to be worth ~30% equity. My goal is to incorporate in about a month, let’s see how it goes by then.
Really, that’s all there is to it. Now if you are curious to know why this is the right way to do it, read on.
You must commit to a number upfront
You need to make the potential co-founder a promise. Something tangible that clearly spells out how much of the company they’ll be getting. You can’t avoid a discussion with a specific number. Am I getting 30% or 5%? That makes a huge difference. By putting it in “writing” (a tweet), you are giving enough rope for the co-founder to sue you if you completely abuse the situation.
You’d be amazed by how many startups I coach that tell me they haven’t discussed equity split yet, although they have been coding along for 6 months or more… The longer you wait to have that discussion, the worse it gets. Be upfront.
You need a way out
Frankly, you should not sign a definitive co-founder agreement with someone you haven’t work with yet. In my experience (confirmed by talking to many entrepreneurs facing the same situation), it takes about a month to know whether it’s going to work out or not. So work together informally for a month, and decide then. Follow your instincts. If after one month, the only contribution of the co-founder are excuses and delay, just stop, don’t try to save the situation and hope that it will get better. It doesn’t.
You need to be fair
While you committed in writing to an equity split, a tweet is clearly not as strong as a legal contract, so in case where the relationship doesn’t work out, there is no additional paperwork needed.
But if you ripped-off the co-founder, the tweet gives them a (small) basis for a lawsuit. So it forces you to do the right thing. It’s a good trade-off, fair for both sides, without getting all lawyerly.
After the one month, if everyone is happy and super-excited about the startup, incorporate. That will make the tweet official. That’s it!
PS: did I mention that if you construe this post as legal advice, you deserve the mess you’ll get into? Of course you should talk to a real lawyer. Just do your own research as well.
I’ll happily take comments from lawyers and others about whether this approach is sound or not.




