Most co-founder disputes were predictable. Not because the founders were bad people or made bad decisions under pressure, but because the agreement they signed at the beginning left too many things undefined. When circumstances changed, and they always do, there was no framework to fall back on.
A well-structured co-founder agreement does not prevent conflict. It gives you a mechanism for resolving it without destroying the company in the process. Here is what needs to be in it.
Equity split and vesting
The equity conversation is where most founding teams start, and for good reason. How ownership is divided sets the tone for everything that follows. The split itself should reflect actual contributions: who came up with the idea, who is taking the bigger financial risk, who has the deeper relevant experience, and what each founder's ongoing time commitment looks like.
Whatever split you land on, it needs to be paired with a vesting schedule. The standard structure is four years with a one-year cliff, meaning no equity vests until month twelve, then 25% vests at the cliff and the remaining 75% vests monthly through year four. If a founder leaves before the cliff, unvested shares return to the company. Without this mechanism, a departing founder takes whatever equity they were granted on day one, regardless of how long they stayed or what they contributed.
Investors will require vesting. Build it in from the start rather than retrofitting it under pressure before a round closes.
Roles and decision-making authority
Ambiguous authority is the leading cause of founder conflict. When two people both believe they have final say over product direction, hiring decisions, or spending above a certain threshold, the disagreement is not really about the decision at hand. It is about a structural problem that was never resolved.
The agreement should define each founder's title, their primary areas of responsibility, and what decisions they can make unilaterally versus what requires consensus. It should also address what happens when founders cannot agree, which is the part most agreements leave vague.
Intellectual property assignment
Every founder needs to assign their intellectual property to the company. This means any code, designs, inventions, algorithms, or other work product created in connection with the company belongs to the company, not to the individual who built it.
Without a clear IP assignment clause, a departing founder could have a legitimate claim to technology the company depends on. Investors and acquirers will ask about IP ownership during diligence, and any ambiguity becomes a problem that needs to be resolved before a transaction can close.
If any founder is bringing pre-existing IP into the company, it needs to be explicitly listed in a prior invention disclosure schedule attached to the agreement. The blanket assignment clause should not inadvertently capture work that was created before the company existed.
What happens when a founder leaves
This is the section most founding teams skip because it feels uncomfortable to discuss when everyone is excited about building something together. It is also the section that matters most when things go wrong.
The agreement should address several departure scenarios distinctly. Voluntary resignation, termination for cause, termination without cause, disability, and death each have different implications for equity and ongoing obligations. The treatment of unvested shares should be spelled out clearly, as should whether the company has the right to repurchase vested shares from a departing founder and at what price.
If there is no definition of termination for cause in the agreement, it becomes nearly impossible to enforce buyback rights when you actually need them.
Non-compete and non-solicitation clauses
These clauses restrict what a departing founder can do after they leave. A non-compete prevents them from starting or joining a directly competing business for a defined period. A non-solicitation prevents them from poaching employees or customers.
The enforceability of non-competes varies significantly by state, and some states will not enforce them at all. California is the most prominent example. The agreement should be drafted with your jurisdiction in mind, and the scope and duration should be reasonable enough to withstand scrutiny if challenged.
Confidentiality obligations
All founders should be bound by confidentiality obligations that survive their departure from the company. This means they cannot disclose proprietary information, trade secrets, or sensitive business details to competitors, future employers, or the public.
This clause needs to be specific enough to be enforceable. A vague confidentiality provision that does not define what counts as confidential is difficult to rely on when you need it.
Deadlock and dispute resolution
Two founders with equal voting rights can reach an impasse on a decision that matters. The agreement should include a mechanism for breaking deadlocks rather than leaving the company paralyzed when it happens.
Common approaches include designating a tiebreaker vote, requiring mediation before any formal dispute process, or establishing a buyout mechanism where one founder can offer to buy the other out at a specified valuation methodology. None of these are perfect, but having any mechanism is significantly better than having none.
Capital contributions
If any founder is contributing capital to the company at formation, the terms of that contribution need to be documented clearly. Is it a loan or an equity investment? If it is a loan, what are the repayment terms? Does it affect the equity split?
Informal financial arrangements between co-founders create legal problems later. Document everything.
Before you sign
A co-founder agreement is worth the cost of having an attorney review it before everyone signs. The document you negotiate at the beginning, when everyone is optimistic and aligned, is the document you will be relying on when circumstances are much harder. Investing a few hundred dollars in a proper review is cheap compared to the cost of resolving a dispute that the agreement could have prevented.
Use the agreement as a forcing function for conversations that are uncomfortable to have before you have them under pressure.
This post is for informational purposes only and does not constitute legal advice. Consult a licensed attorney before drafting or signing a co-founder agreement.