A co-founder agreement is a non-negotiable 'pre-nup' for your startup. It forces critical conversations about equity, roles, decision-making, and what happens if someone leaves. A standard 4-year vesting schedule with a one-year cliff is essential, and all IP must be formally assigned to the company to make the business fundable.
Key takeaways
- Force the hard conversations about equity, roles, and commitment upfront.
- Implement a 4-year vesting schedule with a 1-year cliff, no exceptions.
- Define specific decision-making authority for product, hiring, and budget.
- Ensure all Intellectual Property (IP) is assigned to the corporation via a CIIAA from day one.
- Plan for founder departure scenarios, including resignation and termination for cause.
- Hire an experienced startup lawyer; do not use a generic template or generalist attorney.
They may be your friend, your sibling, or your former colleague. But the moment you start a company together, you cease to be just friends. You are business partners in a high-stakes, high-stress venture where your financial futures are intertwined. A handshake and good vibes are worthless when you disagree on strategy, a founder stops performing, or one of you wants to leave.
A Co-Founder Agreement is the business 'pre-nup' that forces the brutally honest conversations you must have about ownership, responsibility, and commitment. Creating this document isn't about fostering distrust; it’s about building a resilient foundation so your startup doesn't crumble under the pressure of predictable disagreements.
Ignoring this is malpractice. A vague understanding of 'we're in this together' is the seed of a failed startup. Let's make sure that's not you.
Without a clear, legally-binding agreement, you are exposed to a host of predictable—and preventable—disasters. Investors have seen them all, and any one of them can kill your company before it gets off the ground.
The Dead Equity Disaster: Your co-founder leaves after six months. Without vesting, they walk away with 50% of the company's stock. You're now left to do 100% of the work for half the company, and no VC will fund you. Your cap table has a massive, unmovable hole.
The 'He Said, She Said' Impasse: You thought you were CEO with final say on product. Your co-founder thought you were peers with equal veto power. Now you're deadlocked on a critical hire, and there's no written process to break the tie. Progress grinds to a halt.
The IP Walk-Out: Your technical co-founder builds the entire prototype on their personal laptop before the company is incorporated. They leave in a huff and claim the code is their personal property. The company is now a hollow shell with no assets.
The Surprise Partner Nightmare: A co-founder, facing personal financial trouble, sells their shares to a stranger—or worse, a competitor—without your…
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Frequently asked questions
- What's the standard equity split for co-founders?
- There is no 'standard' split. It should be based on a deliberate conversation about past and future contributions. An uneven split (e.g., 55/45) is often healthier as it designates a clear leader.
- Can we just do a 50/50 equity split?
- You can, but it's a common failure pattern. If you insist on 50/50, you must legally designate one person as CEO with tie-breaking authority to avoid decision-making gridlock.
- What happens if a co-founder leaves before the 1-year vesting cliff?
- They get zero shares. The cliff mechanism ensures a founder must contribute for a minimum of one year to earn any equity, protecting the company from 'dead equity'.
- How much does a startup lawyer cost for this?
- Expect to pay between $3,000 and $10,000 for a reputable firm to handle your incorporation and founder agreements. This is significantly cheaper than the legal fees required to fix messy disputes later.
