Founders' Agreement Template & Key Terms

The hardest conversation in a startup is rarely the product or the market. It's the one between co-founders about who owns what, who does what, and what happens if one of them walks away. A founders' agreement is the document that settles those questions while everyone is still on good terms, so they don't have to be settled by lawyers when they aren't.

This guide covers what a founders' agreement is, the clauses it needs, how to split equity, a worked vesting example with real numbers, and the mistakes that sink co-founder relationships.

What Is a Founders' Agreement?

A founders' agreement is a contract among the people starting a company. It records how ownership is divided, what each founder is responsible for, how decisions get made, and what happens when a founder leaves or the company is sold. Some teams call it a co-founder agreement or a founders' collaboration agreement; the substance is the same.

It is not the same thing as your formal entity documents. Once you incorporate, a corporation runs on bylaws and a shareholder agreement, and an LLC runs on an operating agreement. The founders' agreement comes first and feeds those documents. It captures the deal between the people before there's an entity to attach it to, and many of its terms get carried into the formal paperwork at incorporation.

The agreement matters most in the cases founders least want to think about: someone quits early, two founders deadlock on a major decision, a founder's contribution turns out smaller than promised, or an acquirer asks to see clean ownership. Write it down while you agree, and those moments become clauses instead of fights.

What to Include in a Founders' Agreement

A complete founders' agreement covers the following ground.

Equity Split

State each founder's percentage ownership and the total number of shares or units allocated. Spell out whether the split is fixed or subject to adjustment, and note any equity reserved for an option pool or future hires. Vague language like "we'll split it fairly" is the single most common cause of co-founder disputes.

Vesting and Cliffs

This is the clause that protects the company from a founder who leaves early. Equity vests over time rather than being granted outright, so a founder earns their stake by staying and contributing. The market standard is four-year vesting with a one-year cliff. More on the mechanics, with numbers, below.

Roles and Responsibilities

Define each founder's title, scope, and decision authority. Who owns product? Who owns sales and fundraising? Who signs contracts? Ambiguity here breeds resentment when two founders both think they run the same thing, or when neither owns a function that gets neglected.

Intellectual Property Assignment

Every founder must assign to the company any work created for the business: code, designs, brand assets, domain names, and inventions. Without this, a departing founder can claim personal ownership of something the company can't operate without. A clean IP chain is also the first thing investors and acquirers check. If you want the background on how assignment works, see this guide on assigning and licensing your IP.

Example language: "Each Founder hereby irrevocably assigns to the Company all right, title, and interest in any intellectual property created by that Founder in connection with the business, whether before or after the date of this Agreement."

Decision-Making and Voting

Lay out how ordinary decisions are made and which major decisions need unanimous or supermajority approval. Major decisions usually include raising money, taking on debt, selling the company, issuing new equity, and changing the agreement itself. With two equal founders, build in a tiebreak mechanism so a 50/50 split can't freeze the company.

Founder Departure (Leaver Provisions)

Decide in advance what happens to a founder's equity when they leave, and distinguish a "good leaver" (illness, agreed departure) from a "bad leaver" (fired for cause, quits early). Typically the company or remaining founders get the right to buy back unvested shares, often at a price tied to whether the departure was good or bad. This is closely related to a buy-sell agreement, which sets the buyback mechanics in detail.

Compensation and Time Commitment

Note whether founders are paid, deferred, or unpaid for now, and how much time each commits. A founder treating the venture as a side project while another goes full time is a recipe for a vesting dispute, so tie expectations to the equity grant.

Confidentiality and Non-Solicitation

Founders see everything: financials, customer lists, roadmaps. A confidentiality clause keeps that protected if someone leaves, and a non-solicitation clause keeps a departing founder from poaching the team or customers for a defined period.

Dispute Resolution

Pick how disputes get resolved (mediation, then arbitration is common for early teams), which state's law governs, and where any proceeding happens. Settling forum now prevents an argument about where to argue later.

How to Split Equity Among Co-Founders

There's no single correct split, but there are sensible methods.

• Equal split. Two founders take 50/50, three take roughly a third each. Simple and signals partnership, but it ignores differences in contribution and creates deadlock risk. If you go equal with two founders, you must add a tiebreaker.
• Contribution-weighted split. Weight equity by what each founder brings: the idea, capital invested, full-time vs. part-time commitment, prior IP, industry relationships, and who's taking the bigger career risk. This is harder to negotiate but tends to feel fairer over time.
• Dynamic / milestone-based split. Some teams adjust equity as contributions become clear, though this adds complexity and is best handled through vesting rather than renegotiating percentages.

A worked example for a two-person team where one founder brought the original concept and works full time, while the other joined a month later and works four days a week:

• Founder A (idea, full time, initial $20,000 capital): 60%
• Founder B (joined later, 0.8 FTE, no capital): 40%

The point isn't the exact numbers; it's that the split reflects a documented reason. When you can explain why each percentage is what it is, the agreement holds up to scrutiny from the other founder, future hires, and investors. For a deeper look at structuring an even partnership, this guide on a 50/50 partnership agreement walks through the decision-making side.

Example Vesting Schedule

Vesting is where abstract percentages turn into real protection. Take Founder B above, who holds 40% of a company with 1,000,000 total units, so a 400,000-unit grant on a four-year schedule with a one-year cliff. A standard schedule plays out like this:

• Months 1 to 11: 0 units vested. If Founder B leaves now, they keep nothing. This is the cliff doing its job.
• Month 12 (cliff date): 100,000 units vest at once (25% of the grant).
• Months 13 to 48: the remaining 300,000 units vest evenly, roughly 8,333 units per month.
• Month 48: fully vested at 400,000 units.

Now run the scenario the cliff exists for. Founder B leaves in month 14. They've vested 100,000 units from the cliff plus about 16,666 for two extra months, so roughly 116,666 of 400,000. The company's buyback right (from the leaver provision) lets it repurchase the ~283,000 unvested units, keeping that equity available for the remaining founder and future hires instead of locked up with someone who's gone.

That single mechanism, four-year vesting with a one-year cliff, prevents the most damaging early-stage outcome: a founder leaving in month eight holding a large, permanent slice of a company they're no longer building.

Acceleration: Vesting in an Acquisition

There's one more vesting term worth settling early, because it gets contentious when real money is on the table: acceleration. If the company is acquired before a founder is fully vested, does the unvested equity vest immediately?

Two structures are common. Single-trigger acceleration vests some or all of the remaining equity the moment an acquisition closes. Founders like it; acquirers usually don't, because it can let a founder cash out and walk away right after the deal. Double-trigger acceleration requires two events: the acquisition closes and the founder is terminated without cause (or forced out) within a set window, often twelve months. This is the market norm because it protects founders from being fired purely to claw back their shares, while keeping them on the hook to actually help with the transition.

A typical term grants 100% double-trigger acceleration and either no single-trigger or a partial amount, such as 25%. Spell out which one applies in the founders' agreement so it isn't negotiated under deal pressure, when leverage has shifted to the acquirer and the founders' own interests may diverge.

How to Write a Founders' Agreement: Step-by-Step

Step 1: Name the founders and the venture. Use full legal names and describe the business. If an entity exists, name it; if not, state that one will be formed and that this agreement carries into it.

Step 2: Set the equity split. Record each founder's percentage and the reasoning, plus any reserved option pool.

Step 3: Define vesting. Specify the schedule (four years is standard), the cliff (one year is standard), and the start date for each founder, which should be when they actually began working.

Step 4: Assign IP to the company. Include the assignment clause covering past and future work, and have each founder confirm they're not bringing in third-party IP they can't assign.

Step 5: Lay out roles and decisions. Give each founder a defined scope, and list which major decisions need supermajority or unanimous approval. Add a tiebreaker for equal splits.

Step 6: Write the leaver provisions. Define good vs. bad leaver, the buyback right, and how the buyback price is set.

Step 7: Add the legal terms. Confidentiality, non-solicitation, dispute resolution, governing law, and signatures from every founder. Each signature should be dated.

Common Mistakes

Skipping the agreement entirely. Most co-founder breakups that turn ugly happen because nothing was written down. A handshake split is unenforceable and unprovable.

No vesting. Granting equity outright means a founder who quits in month three keeps their full stake forever. Vesting is non-negotiable for any team that plans to raise money.

Forgetting IP assignment. If the code or brand isn't owned by the company, you don't really have a company to sell or fund. Investors will catch this in diligence.

Equal splits with no tiebreaker. A 50/50 company with no deadlock mechanism can be paralyzed by a single disagreement. Build in arbitration or a casting vote.

Treating it as final and forgetting it. The founders' agreement should be reflected in your entity documents at incorporation and revisited when you raise money or add a co-founder. A document that contradicts your cap table creates more problems than it solves.

Copying a template without adjusting the substance. A boilerplate agreement that doesn't match your actual equity split, vesting dates, and roles is worse than nothing, because it looks settled while leaving the real terms undefined.

Related guides

• 50/50 Partnership Agreement: Structuring Ownership and Decision-Making for Co-Founders
• Understanding Vesting Deed Definition in Property Title Transfers
• SAFE Agreement Template: A Founder's Guide
• Fractional CTO Agreement: Equity Compensation and Time Commitment
• Home Equity Loans and Taxes: A Comprehensive Guide

Generate Your Founders' Agreement with Contractable

A founders' agreement is straightforward once you know the clauses, but getting the vesting math, IP assignment, and leaver provisions right for your specific split is where teams stumble. Contractable generates a customized founders' agreement in minutes, with the equity split, vesting schedule, and protections your team needs, so you can lock in the deal while the conversation is still easy. No lawyers or legal background required.