What goes in a founders' agreement (and what happens when you skip it).

Co-founder disputes are the single most expensive avoidable problem in early-stage companies. The vast majority of them happen because the founders never wrote down what they agreed to — or wrote down the wrong things, or wrote them down in a way that doesn't actually do what the founders thought it would.

A founders' agreement is the document that prevents most of these disputes. Done right, it takes a few hours of conversation and a few days of legal drafting. Done late or done wrong, it costs $50,000 to $500,000 in litigation and lost time, plus the company's collapse in many cases. Co-founder breakups are by far the leading cause of failure for venture-stage startups that have raised money but haven't yet found product-market fit.

This article walks through what actually goes in a good founders' agreement, why each piece matters, and what happens when founders skip it.

When you actually need one

Any time two or more people are starting a company together, you need a founders' agreement. That includes:

• Two friends starting a company over a weekend
• An MBA team that won a business plan competition and decided to actually build it
• A technical co-founder joining a non-technical founder pre-incorporation
• A team of three or more founders with different roles and contribution levels

The single-founder case is different — you don't need a founders' agreement when there's nobody to agree with. But add a second founder and you need one, the day you decide to work together. Not the day you incorporate. Not the day you raise money. Day one.

"We trust each other, so we don't need this"

Every founder duo says this. Most of them mean it. But trust isn't the question. The question is what happens when something unexpected happens — one founder loses interest, takes a different job, gets sick, goes through a divorce, dies, has a falling out with the other founder. None of those events require bad faith from anyone, and all of them happen in real companies. The agreement isn't a sign of distrust. It's a sign that you've thought carefully about the future and want to protect each other from situations neither of you can fully predict.

What goes in a founders' agreement

A complete founders' agreement covers six core areas. Each one is a place where founders most commonly disagree later if it's not written down up front.

1. Equity allocation

Who owns what percentage of the company. This sounds simple but is the source of the largest number of founder disputes. Real questions to answer:

• Is the split equal (50/50, 33/33/33), or weighted by contribution?
• If weighted, weighted by what? Idea origination? Sweat equity? Capital contribution? Domain expertise?
• What if a founder joins later — what's their share, and how is it carved out?
• What's the cap table at incorporation, and is there a pool reserved for early hires?

The default that startup advisors push toward is "as equal as makes sense" because asymmetric splits create resentment over time as the work the founders do diverges from the equity they own. But equal isn't always right — if one founder is part-time and the other is full-time, equal can also create resentment, just in the other direction.

2. Vesting

The single most important clause in a founders' agreement. Vesting means the founder doesn't actually own their equity outright on day one — they earn it over time based on continued contribution, typically over four years with a one-year cliff.

Standard founder vesting: 25% of the founder's equity vests at the one-year mark, then the remaining 75% vests monthly over the following three years. If a founder leaves before the one-year cliff, they get nothing — their entire equity stake reverts to the company. If they leave between year 1 and year 4, they keep what's vested, and the rest reverts.

3. Roles and responsibilities

What each founder is actually responsible for, day to day. Engineering, sales, fundraising, operations, product, legal. This isn't a job description — it's a high-level allocation of responsibility so the founders know who owns what decisions.

This matters because most founder disputes look like equity disputes on the surface but are actually role disputes underneath. "She's not pulling her weight" is often a real complaint, and it usually means the founders never explicitly defined what each person's weight was.

4. Decision-making and governance

Who decides what. There are typically three tiers:

• Day-to-day decisions — handled by whoever owns that area of the business
• Material decisions — require unanimous founder consent (e.g., taking on debt, hiring a senior executive, signing a major contract)
• Existential decisions — selling the company, raising priced equity, dissolving — require unanimous consent and often board involvement

Without explicit decision rights, every disagreement becomes a referendum on who's in charge. With them, most disagreements have an answer the founders agreed to in advance.

5. IP assignment

Every founder must assign all relevant intellectual property to the company. This includes code, designs, brand assets, anything the founder created before incorporation that's relevant to the business, and anything they create going forward. Without explicit IP assignment, the company doesn't actually own its own technology — the founders do, individually. Investors will refuse to fund a company in this state, and acquirers will refuse to acquire it.

This is also where moonlighting issues get addressed: what happens if a founder does outside consulting, contributes to open source, or has prior IP from a previous employer.

6. Departure provisions

What happens when a founder leaves. Beyond vesting, this covers:

• Voluntary departure — what they keep (vested equity), what they give up (unvested equity, board seat, role)
• Termination for cause — typically same as voluntary, sometimes worse
• Termination without cause — sometimes accelerated vesting, sometimes a buyout
• Death or disability — what happens to the equity (held by family, bought out, etc.)
• Buy-sell triggers — drag-along, tag-along, right of first refusal
• Non-compete and non-solicitation — limited and reasonable, especially after recent FTC and state-level changes to non-compete enforceability

What happens when founders skip it

Three patterns we see repeatedly in disputes that come into the firm.

Pattern 1: The "I quit" with full equity

Two founders, equal equity, no vesting. Six months in, one founder decides this isn't for them and quits. They walk away with 50% of the company forever. The remaining founder builds the next four years alone — diluting their own stake every time they raise money or hire — while their absent co-founder watches their stake become valuable without contributing another hour.

By the time the company is worth real money (and now it's "their" money on paper), the working founder is asking the absent founder to give equity back. The absent founder usually says no, because why would they. The result is litigation, public airing of the dispute, and often the company's destruction.

This entire scenario is prevented by vesting. The clause is one paragraph long.

Pattern 2: The phantom IP claim

Three years into building the company, one founder is unhappy with their equity and threatens to assert that the company's core technology is actually their personal IP — they wrote the original prototype before the company was incorporated, and they never actually assigned it to the company. The legal answer to whether they have a claim depends on whether there was an explicit IP assignment in the founders' agreement.

Without one, the answer is murky and expensive to litigate, which means the founder threatening the claim has real leverage even if they would lose at trial. Companies pay seven-figure settlements to avoid having to test these claims in court.

Pattern 3: The frozen company

Two founders, 50/50 equity, no decision-making framework, no governance terms. They disagree on a critical question — whether to take a strategic acquisition offer, whether to fire a senior executive, whether to pivot the product. Neither can force the decision. The company freezes. Months pass. The opportunity that prompted the question disappears. Eventually one founder leaves or both founders agree to dissolve, but the company is dead.

Decision-making frameworks prevent this. They're not glamorous, but they keep the company moving when founders disagree on hard questions.

What it costs to do right

A complete founders' agreement, drafted by an attorney, typically costs between $1,500 and $5,000 depending on complexity (number of founders, equity structure, IP situation, and whether it's bundled with the LLC or corporate formation).

Templates exist. Y Combinator publishes one. Cooley publishes one. Several services will sell you one for $99. We'd urge against using any of them as your final document — not because they're bad, but because the conversations a template doesn't have with you are the entire point. Sitting down with an attorney to talk through what each clause means for your specific situation is what produces the agreement that actually protects you.

That said, templates are useful for orientation. Read more about our flat-fee business formation practice — we draft founders' agreements as part of LLC and corporation formations, or as a standalone document if you've already incorporated.

When to revisit it

Founders' agreements should be revisited at three moments:

• Adding a co-founder — the new founder needs to be added with their own equity, vesting, and role definition
• First financing round — investors will require certain terms in the operating agreement (or stockholders' agreement) that interact with the founders' agreement, and the original document often needs to be amended or restated
• Material strategic change — pivoting, restructuring, or significantly changing the business model is a good moment to revisit decision-making and equity structure if the original assumptions no longer hold

Outside those moments, a well-drafted founders' agreement should hold up for years without amendment. The whole point is to be the document you can rely on when something hard happens — not the document you're constantly rewriting.

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