Most co-founder disputes trace back to questions nobody wanted to ask at the start: What happens if one of us leaves? Who owns the code you wrote before we incorporated? Who breaks a tie? A founder agreement forces those conversations while everyone is still on good terms — and turns the answers into enforceable terms. Here is what a California founder agreement should cover and why waiting is the expensive option.
Why the default rules are worse than anything you would negotiate
If two or more people start building a business together without formation documents, California law may treat them as a general partnership by default. Under the Revised Uniform Partnership Act, that means equal profit sharing regardless of contribution, personal liability for partnership obligations, and fiduciary duties between partners — none of which you chose. Even after you form an LLC or corporation, silence on founder issues leaves you with statutory defaults and, worse, ambiguity that only litigation can resolve.
A founder agreement (or its terms spread across a shareholder agreement, restricted stock purchase agreements, and an operating agreement) replaces those defaults with rules you actually picked. Getting the business formation documents right at the outset costs a fraction of untangling a dispute later.
Equity splits — and why 50/50 deserves scrutiny
An even split feels fair, but it should be a decision, not a reflex. Consider who is contributing capital, who is working full time versus nights and weekends, who brought the idea, the customers, or the technology, and whose ongoing role is hardest to replace. If you do land on 50/50, pair it with a deadlock-breaking mechanism — because a company split down the middle with no tiebreaker is a lawsuit waiting for a filing date.
Vesting: the single most important protective term
Vesting means founders earn the right to retain their equity over time instead of holding it free of a company repurchase right on day one. A common structure is a four-year schedule with a one-year cliff: nothing vests for the first year, 25% vests at the one-year mark, and the remainder vests monthly. If a founder walks away after eight months, the company may exercise its right to repurchase the unvested shares — instead of a departed co-founder holding a large, permanent stake while everyone else does the work.
In a California corporation, this is typically documented through restricted stock purchase agreements with a company repurchase right. Founders should also discuss acceleration: does vesting speed up if the company is sold, or if a founder is terminated without cause? Decide it now, in writing.
Intellectual property assignment
The company is worth little if it does not own its core assets. Every founder should sign an assignment transferring relevant pre-formation work product — code, designs, branding, customer lists — to the entity, plus an ongoing invention assignment for work created after formation. California Labor Code § 2870 limits how far invention assignments can reach into an employee's own time and resources, so the language needs to be drafted to fit California law rather than copied from an out-of-state template. If a founder previously worked in the same field, check their old employment agreements for surviving IP or confidentiality obligations before the company builds on anything they brought with them.
Control, deadlock, and departures
Beyond ownership percentages, decide how decisions get made:
- Day-to-day authority. Which founder can sign contracts, hire, and spend without asking the others, and up to what dollar amount?
- Major decisions. Which actions — raising money, issuing new equity, selling the company, taking on debt — require unanimous or supermajority approval?
- Deadlock. If owners are evenly split, what breaks the tie? Options include a neutral tie-breaking director, mediation, or a buy-sell trigger.
- Buy-sell terms. If a founder dies, divorces, becomes disabled, or simply quits, can the company or remaining founders buy their equity? At what price, and on what payment schedule?
- Restrictions on transfer. A right of first refusal gives the company or co-founders an opportunity to buy a founder's stake before it is sold to a stranger you never agreed to work with.
Put it in writing before you think you need it
The best time to sign a founder agreement is before the company has meaningful value — when nobody has leverage and everyone is motivated to be fair. Once revenue arrives or an investor shows interest, positions harden and yesterday's easy conversation becomes a negotiation. If your company is already running without these terms, it is not too late: founders can adopt vesting, IP assignments, and buy-sell provisions after the fact, and cleaning that up before a financing is far better than explaining the gap to an investor's counsel during diligence.
Talk to a California business attorney
If you are starting a company with co-founders — or already running one without a founder agreement — a short conversation now can prevent an expensive dispute later. Schedule a free consultation or call (949) 418-2113.
This article is attorney advertising and provides general information only. It is not legal advice and does not create an attorney–client relationship. Facts matter; consult a lawyer about your specific situation.
