The 7 Clauses Startup Founders Regret Leaving Out Of Their Partnership Agreements (i Will Not Promote)

I recently gathered recommendations I frequently make to young startup founders and thought the community might get some value from them (Mods, please let me know if this isn’t allowed - seems fine to me but just to be sure)

Founders commonly defer crafting a cofounder agreement because they don’t know such a concept exists, because they’re "grinding" or because there are too many unknowns. But handshake deals are just future fights waiting to happen. It is never too early for a cofounder agreement. You can always update as things evolve.

1. Write it Down (Don't let the state decide)

Without a signed cofounder agreement, your state’s default laws fill the gaps. Usually, that means equal profit splits and equal votes. If you’re doing 90% of the work while your partner is at a frat party, the law doesn't care—they still get 50%. Control your own narrative; don't let a generic statute do it for you.

2. Define the Money (and the "Sweat")

Vague economics destroy partnerships. You need to be hyper-specific:

• Contributions: Who is putting in cash vs. who is providing "sweat equity?"
• Distributions: When do you actually get paid? Is profit being reinvested into the tech, or can someone pull it out for rent?
• Buyouts: If one person wants out, how do you value their share? (Hint: Use a pre-set formula, not a "we'll figure it out then" approach).

3. Lock Down the Intellectual Property (IP)

This is the most common mistake founders make. The person who creates the code/design owns it by default, NOT the company.

• The Assignment: Every founder and contractor must sign an IP Assignment Agreement. This legally transfers ownership of the code, ideas related to the business, logos, and patents from the individual to the entity.
• The "Clean" Start: If you wrote the initial code in your dorm room before you even incorporated, you need to "assign" that past work to the new company officially.

Why it matters: Investors will demand this is clear and in writing and when investor dollars are at stake, the IP assignment conversation can be harder.

4. Decide Who Drives the Bus

"Equal partners" sounds nice, but it’s a recipe for a deadlock.

• Day-to-Day vs. Big Picture: Define who has the final say on hiring, and who has the final say on the product roadmap.
• The Tiebreaker: If you’re split 50/50, you need a deadlock mechanism. This could be a trusted advisor who holds a "tie-breaking" vote or a "Shotgun Clause" (where one partner offers to buy the other out, and the other must either accept or buy the first partner out at that same price).

5. Standardize Vesting (The "Stickiness" Factor)

People can change their minds. Someone might get a high-paying job offer at Google and want to leave six months in.

• Don't give away equity on day one. Use a 4-year vesting schedule with a 1-year cliff
• If a partner leaves before the one-year mark, they walk away with 0%. This protects the founders who stay and keep building.

6. Address "Side Hustles" and Conflicts

startups are for experimentation, but your co-founder needs to know if your "side project" is actually a competitor.

• Clarify what "full-time" means.
• Define what constitutes a conflict of interest.
• Ensure that any IP created using company resources belongs to the company, period.

7. Plan the Exit (While you still like each other)

What happens if a partner quits, gets a "real job," or—heaven forbid—passes away?

• Right of First Refusal: If a partner wants to sell their shares, the company (or the other founders) should have the first right to buy them so you don't end up with a random stranger as a business partner.
• Dispute Resolution: Agree to mediation before anyone is allowed to file a lawsuit. It’s cheaper and keeps your business out of the public record.

What would you add? Any clause you have seen cause problems in practice?