Two people start a company together because they trust each other. That trust is genuine, and it is also the reason the hard conversations get postponed. Talking about what happens if one of you leaves feels like planning a divorce during the engagement party.
Then something ordinary happens. One co-founder takes a job to cover rent and keeps contributing on weekends. One wants to raise money and the other wants to stay small. Someone’s spouse gets a job in another country. Suddenly two people who genuinely like each other are arguing about equity, and there is nothing written down that tells them who is right.
This article is an educational overview of what co-founder agreements typically cover and why each conversation matters. It is not legal advice, and the actual document should be drafted or reviewed by a qualified lawyer in your jurisdiction. What you can do without a lawyer is have the conversations early, honestly, and in writing, so that the lawyer is documenting decisions you have already made rather than mediating a fight.
Why founders avoid this and why it costs them
The avoidance has a logic to it. Raising these topics early can feel like distrust, like you are already imagining the relationship failing. There is a real social cost to being the person who says “let’s talk about what happens if this doesn’t work.”
But the cost of not talking is asymmetric. Right now, before there is anything valuable, you are negotiating a hypothetical. Neither of you knows who will end up contributing more, so both of you can be reasonable. Two years later, when there is revenue, a term sheet, or an acquisition offer, the same conversation happens with real money on the table and two people who each have a vivid memory of how hard they personally worked.
The best time to divide something is while it is still worth nothing to both of you.
There is also a practical consequence. Investors and acquirers look at cap tables and founder documentation early in diligence. A messy equity situation, an absent founder still holding a large stake, or intellectual property that was never formally assigned to the company can slow or kill a deal. These are not exotic problems. They are among the most common reasons early-stage transactions stall.
Equity: the split and the schedule
Most founders think the hard part is the percentage. The percentage matters, but the schedule matters more.
The split itself
Equal splits are common and often defensible, particularly when two people are both leaving jobs and committing fully. Unequal splits are equally defensible when the contributions genuinely differ: someone came with the idea and a year of prior work, someone is full time while the other is part time, someone is putting in capital.
What matters is that the reasoning is explicit. Write down why you chose the split you chose. Later, when one person feels the arrangement has become unfair, the written reasoning either still applies or clearly does not, and you have something concrete to renegotiate from instead of competing memories.
Common inputs founders weigh in the discussion:
- Time commitment now and expected commitment over the next two years.
- Prior work, existing code, existing customer relationships, or an existing audience.
- Cash contributed, and whether that cash is equity or a loan to the company.
- Opportunity cost, including salary given up.
- Who carries the risk if the company needs a personal guarantee or takes on debt.
- Role and expected ongoing contribution, not just the launch period.
Vesting is the real protection
Vesting means founders earn their shares over time rather than owning them outright on day one. A widely used structure is four years with a one-year cliff, meaning nothing vests until the first anniversary and the remainder accrues gradually after that. The specific numbers vary by company and jurisdiction, and this is one of the clauses most worth having a lawyer draft properly.
The reason vesting matters is simple. Without it, a co-founder who leaves after four months keeps their full stake forever, while the person who stays builds the company for a decade on behalf of someone who is gone. That situation is not a hypothetical edge case; it is the single most common serious equity problem early companies face.
Vesting protects both of you. If you are the one who leaves, it also means you walk away with a stake proportional to what you contributed, rather than in a bitter negotiation about whether you deserve anything at all.
What happens on a departure
The agreement typically distinguishes between someone leaving voluntarily, being asked to leave for cause, and leaving for reasons nobody controls, such as illness or a family emergency. Each usually carries different consequences for unvested shares and sometimes for vested ones.
The conversation to have is not about clause language. It is about what feels fair to both of you in each scenario, described in plain words, before you know which of you it will apply to.
Roles, decisions, and who breaks a tie
Equity answers who owns the company. It does not answer who decides. Two people who each own half can deadlock permanently, and a deadlocked company cannot sign a contract, hire, or raise.
Define decision domains
Rather than trying to agree on everything, agree on who owns which category of decision by default. Product and engineering. Sales and pricing. Hiring. Finance and fundraising. Legal and compliance. One person is the decider in each domain; the other is consulted and can disagree, but the decider decides.
Then define the short list of decisions that require both of you: raising money, selling the company, taking on debt, changing the equity structure, hiring or firing a co-founder-level executive, changing the fundamental direction of the business.
Plan for deadlock before it happens
Mechanisms founders use include appointing a neutral advisor or board member as a tiebreaker, agreeing that one founder holds a casting vote in a specific domain, or agreeing on a structured process such as a cooling-off period followed by a formal vote. What matters less than the method is that one exists and both of you agreed to it while calm.
Money in and money out
Two founders can have wildly different financial situations and still work well together, but only if the difference is acknowledged out loud. One with savings and no dependents can go eighteen months unpaid. One with a mortgage and two children cannot, and pretending otherwise creates resentment that surfaces as arguments about something else entirely.
Questions worth answering explicitly:
- How long can each of you personally go without income, honestly?
- When does the company start paying salaries, and what triggers that?
- If one founder puts in cash, is it equity, a loan, or a convertible instrument, and what are the terms?
- Can a founder take on outside consulting work, and if so, how much and with what disclosure?
- What expenses can each of you approve alone, and above what number do you both sign off?
The salary question deserves particular attention. Founders often agree to take nothing, then one quietly starts drawing a small amount to survive, and the other finds out later. The arrangement itself is usually fine. The discovery is what does the damage.
Intellectual property and confidentiality
This is the least emotional section and the one most likely to cause a technical problem later. Work created by founders before or during the company’s formation needs to be formally assigned to the company, not merely assumed to belong to it. That includes code, designs, brand assets, domain names, and content.
Two situations cause recurring trouble. First, a founder who built something relevant while employed elsewhere, where the prior employer may have a claim under the employment contract. Second, a founder who registered the domain, the cloud accounts, or the app store listing in their personal name and never transferred them.
These are worth resolving early with proper documentation, because they are cheap to fix now and expensive to fix during diligence. A lawyer can tell you what assignment language and what steps are required where you are incorporated.
The conversations that are not in the document
A co-founder agreement is a legal artifact. The relationship it protects runs on things no document captures, and those deserve their own discussion.
Ambition and time horizon
One of you may want a company that pays both of you well and stays independent for twenty years. The other may want to build fast, raise venture capital, and sell within five. Neither is wrong. They are simply incompatible, and finding out at the term sheet stage is the worst possible moment.
Ask directly: what does success look like in seven years? What size company do you want to be running? Would you sell for an amount that changed your life but ended the project? How much of your life are you willing to give this?
Working style and conflict
How does each of you behave under stress? Does one go quiet and the other escalate? Do you prefer to resolve disagreements immediately or after a night of thinking? How will you give each other difficult feedback about performance when there is no manager above either of you?
Agree on a rhythm: a standing weekly conversation that is explicitly about the partnership rather than the work. Most co-founder breakdowns are the accumulation of small unspoken grievances, and a recurring slot where raising them is expected prevents most of that accumulation.
Life outside the company
People have children, get sick, care for parents, and move countries. Talking about how the partnership absorbs those events makes them survivable. A co-founder who needs three months of reduced capacity for a family reason should not have to negotiate that from a position of guilt.
Frequently Asked Questions
Do we need a formal agreement if we are just two people with no revenue?
Having the conversations matters immediately; the formal document usually follows incorporation. Most jurisdictions require certain founder terms to be set out in company documents, and equity arrangements in particular are far simpler to establish at formation than to retrofit later. A lawyer in your jurisdiction can tell you what needs to exist and when.
What if my co-founder is offended that I raised this?
Frame it as protection for both of you rather than protection from them, because that is what it is. A reasonable co-founder recognizes that clear terms protect the person who stays and the person who leaves. Persistent refusal to discuss the topic at all is itself meaningful information about how future disagreements will go.
Can we write the agreement ourselves from a template?
Templates are useful for understanding the structure and preparing for the conversation. They are risky as final documents, because company law, employment law, and tax treatment differ significantly by country and sometimes by state or province, and a clause that works in one place can be unenforceable in another. Use a template to prepare, then have a qualified lawyer draft or review the actual agreement.
What this really buys you
The value of a co-founder agreement is not that it wins the argument later. Most founder disputes that reach a lawyer are already relationship failures, and the document only determines how expensively they end.
The real value is upstream. Sitting down for a few hours and answering hard questions honestly tells you an enormous amount about whether this partnership works. You will find out whether your co-founder can discuss uncomfortable things without becoming defensive, whether your ambitions actually align, and whether you can negotiate with each other and still like each other afterward.
If the conversation goes well, you have a stronger partnership and a document that reflects it. If it goes badly, you have learned something crucial while the cost of learning it is one difficult weekend rather than three years and a legal bill. Either way, book the time, write down what you decide, and then take those decisions to someone qualified to turn them into a document that holds.
