Contracts for Co-Founder Agreements: What You Need and What You Don't
TL;DR Every co-founder pair needs a written agreement covering equity, vesting, roles, and what happens when someone leaves. An LLC operating agreement can double as your co-founder agreement if it’s thorough enough. You probably don’t need a shareholder agreement or board governance docs until you’re raising outside money.
Most co-founders skip the paperwork
Two people start a business together. They register a domain and start selling. The conversation about equity happens over coffee or a text thread. Roles get sorted out by whoever happens to do what first. Nobody writes anything down because it feels premature, or awkward, or both.
This works until the first real disagreement. And when that disagreement arrives, the absence of a written agreement turns a fixable problem into a much more expensive one.
The scenario plays out the same way almost every time. Someone wants to leave, or someone feels they’re doing more than their share. The business starts making real money and the original handshake deal suddenly matters a lot more. Without a written agreement, each co-founder remembers the original terms differently. There’s no document to point to. The resolution involves lawyers or the business shutting down entirely.
A co-founder agreement prevents this. A short document that answers the five or six questions that cause the most disputes, with both signatures on it, is enough.
What actually belongs in a co-founder agreement
A co-founder agreement needs to cover the areas where disagreements are most likely and most damaging. Everything below applies whether you’re forming an LLC or a corporation.
Start with the equity split. Who owns what percentage of the business is the single most important line in the document. If you’re splitting 50/50, write it down. If one person is contributing capital and the other is contributing labor, the split might be 60/40 or 70/30, and the reasoning should be documented alongside the numbers. A split that feels fair at month one can feel very different at month twelve if the underlying logic was never written down.
The agreement also needs a vesting schedule, which determines when each co-founder actually earns their equity. Without one, a co-founder who leaves after three months owns the same percentage as a co-founder who stays for five years. The standard arrangement is four-year vesting with a one-year cliff: no equity vests until the first anniversary, then the remainder vests monthly or quarterly over the following three years. This protects both parties. If your co-founder leaves early, they don’t walk away with half the company. If you leave early, the same applies to you.
Roles and decision-making authority need to be written down too. Who handles what, and how you resolve disagreements when you don’t agree. For a two-person business, this is often informal at first, but the agreement should at least specify who has final say on financial decisions (spending above a certain threshold or taking on debt) and operational decisions (hiring and product direction). A common approach is to give each co-founder authority over their domain and require mutual agreement for anything above a dollar threshold you both set.
Then there’s the departure clause. This is the one nobody wants to think about, and the one that matters most when things go wrong. The agreement should specify whether the departing co-founder’s equity gets bought back by the remaining co-founder or the company, at what price (typically fair market value or a predetermined formula), and over what time period. It should also address involuntary departures: what happens if a co-founder dies or becomes unable to continue working.
An IP assignment clause ensures that any work product created for the business is company property. This covers everything from code and designs to client lists — anything developed on company time. Without this clause, a departing co-founder could argue that the website they built or the client relationships they developed belong to them personally. If you made it for the company, the company should own it.
Finally, the agreement should specify how you’ll handle disputes that you can’t resolve between yourselves. The main options are mediation (a neutral third party helps you reach an agreement), arbitration (a neutral third party makes a binding decision), and going to court. Most small business attorneys recommend requiring mediation first because it’s the cheapest and fastest path, with arbitration as a fallback if mediation fails.
| Clause | What it covers | Why it matters |
|---|---|---|
| Equity split | Ownership percentages and the reasoning behind them | Prevents disputes over who owns what |
| Vesting schedule | When each co-founder earns their equity (typically 4 years, 1-year cliff) | Protects against early departures |
| Roles and decision-making | Authority boundaries and spending thresholds | Prevents deadlocks on financial and operational decisions |
| Departure terms | Buyback price, payment timeline, voluntary and involuntary exits | Defines what happens when someone leaves |
| IP assignment | Company ownership of all work product | Prevents departing co-founders from claiming company assets |
| Dispute resolution | Preferred resolution method and escalation path | Sets the process before emotions run high |
What you probably don’t need yet
Startup advice online tends to assume you’re raising a seed round next month. If you’re two people running a consulting firm or a small product company with no plans to take outside investment, several common documents are overkill at your stage.
A shareholder agreement is designed for companies with outside investors and a board of directors. If you don’t have investors and you’re not a C-corp, you don’t need one. Your co-founder agreement or LLC operating agreement covers the same ground for a two-person company.
Board resolutions and formal meeting minutes are corporate formalities that matter when you have a board. Two co-founders making decisions together over Slack don’t need Robert’s Rules of Order.
A formal employee handbook is a good idea once you hire employees, but not when it’s just the two of you. Your co-founder agreement handles the relationship between founders. Employment terms are a separate concern for a later stage.
Non-compete agreements between co-founders are common in VC-backed startups where the founders have specialized knowledge and the investors want protection. For a two-person small business, a non-compete can be harder to enforce (courts in many states view them skeptically for small businesses) and may not be worth the legal cost to draft properly. A non-solicitation clause covering clients and employees is usually sufficient and more enforceable.
The LLC operating agreement question
If you’re forming an LLC (and most two-person businesses in the US should at least consider it for liability protection), your state may require an operating agreement. Even states that don’t legally require one make it a good idea, because without an operating agreement, your LLC is governed by your state’s default rules. Those default rules may not match what you and your co-founder actually agreed to.
An LLC operating agreement covers much of the same territory as a co-founder agreement — ownership percentages, profit distribution, management structure, and dissolution procedures among them. If your operating agreement is thorough enough, it can replace a separate co-founder agreement entirely.
The areas where a standalone co-founder agreement adds value beyond a basic operating agreement are vesting schedules (most operating agreement templates don’t include them) and IP assignment (not a standard operating agreement provision). Operating agreements also tend to describe management structure in general terms rather than specifying who handles sales vs. product, so a co-founder agreement can fill that gap.
If you’re using a template for your operating agreement, check whether it covers vesting and IP assignment. If it does, you may not need a separate co-founder agreement at all. If it doesn’t, either add those provisions to the operating agreement or create a short supplementary co-founder agreement that references the operating agreement and fills in the gaps.
How much this costs if you use a lawyer
Attorney fees for co-founder agreements vary by location and complexity, but the typical range for a two-person small business is predictable enough to plan around.
| Service | Typical cost | Best for |
|---|---|---|
| Template from Rocket Lawyer, LegalZoom, or Clerky | $100 to $500 | Straightforward 50/50 splits with standard terms |
| Attorney review of a completed template | $500 to $1,500 | Equal splits with standard vesting, no unusual IP |
| Attorney drafts from scratch | $1,500 to $5,000 | Unequal splits or capital-for-labor arrangements |
| LLC operating agreement (attorney-drafted) | $1,000 to $3,000 | Can be bundled with co-founder agreement |
| Litigating a dispute without a written agreement | $10,000 to $50,000+ per side | What the agreement prevents |
A basic co-founder agreement review, where you bring a template you’ve already filled out and the attorney reviews it for gaps and state-specific issues, runs $500 to $1,500. This is the most cost-effective approach if your situation is straightforward: roughly equal equity split with standard four-year vesting.
Drafting a co-founder agreement from scratch, where the attorney interviews both co-founders and writes the document based on your specific situation, runs $1,500 to $5,000. This makes sense for unequal equity splits or situations where one co-founder is contributing capital and the other is contributing labor.
An LLC operating agreement drafted by an attorney typically costs $1,000 to $3,000 on its own. If you’re getting both an operating agreement and a co-founder agreement, most attorneys will bundle them.
For context, litigating a co-founder dispute without a written agreement typically costs $10,000 to $50,000 or more per side, and can take a year or longer to resolve. The agreement is cheap insurance.
If budget is tight, a well-reviewed template is better than nothing. Several legal services (Rocket Lawyer, LegalZoom, Clerky for startups) offer co-founder agreement templates in the $100 to $500 range. The template won’t account for state-specific quirks or unusual arrangements, but it will put the essential terms in writing, which is the most important step.
Getting the agreement signed properly
Once you’ve written or had an attorney draft your co-founder agreement, both parties need to sign it in a way that creates a clear legal record. A handshake or a “sounds good” in Slack doesn’t count.
E-signatures are legally binding for co-founder agreements in the US under the ESIGN Act and in the EU under the eIDAS regulation. You don’t need to print and scan a physical copy. A proper e-signature tool records signer identity and produces a tamper-evident audit trail proving the document wasn’t altered after signing. That audit trail matters if the agreement ever needs to hold up in a dispute.
What you want to avoid is signing via email reply (“I agree to the attached”) or a shared Google Doc where both people type their names. These methods create ambiguity about identity verification and document integrity. An e-signature tool with an audit trail eliminates that ambiguity. We covered how e-signatures hold up legally in a separate post if you want the full breakdown.
For a two-person business, any e-signature tool that supports multi-party signing and produces a tamper-evident audit trail will work. Both co-founders should have their own accounts so the signer identity is tied to an individual, not a shared login.
Keep the signed copy somewhere both co-founders can access it. A shared drive or both parties’ e-signature accounts will work. The worst outcome is a properly executed agreement that nobody can find when they need it.
FAQ
Do co-founders need a written agreement?
Yes. A verbal agreement about equity splits or decision-making has almost no legal weight if co-founders later disagree. A written co-founder agreement (or an LLC operating agreement that covers the same ground) establishes each person’s equity share, responsibilities, vesting terms, and what happens if someone leaves. Courts consistently defer to written agreements over verbal understandings in partnership disputes.
What should a co-founder agreement include?
A co-founder agreement should cover five things at minimum: equity split and vesting schedule, roles and decision-making authority, what happens if a co-founder leaves (buyback terms), IP assignment so the company owns all work product, and how disputes get resolved. Everything else is optional depending on your business structure and stage.
Is a co-founder agreement the same as an operating agreement?
Not exactly, but they overlap. An LLC operating agreement is a legal requirement in most states and covers how the business is owned and managed. A co-founder agreement can include those same provisions plus startup-specific terms like vesting schedules and IP assignment. If you form an LLC, your operating agreement can serve as your co-founder agreement if it covers all the necessary terms.
Do I need a lawyer for a co-founder agreement?
For a two-person business splitting equity 50/50 with straightforward terms, a well-reviewed template can work. For unequal equity splits or complex vesting arrangements, a business attorney is worth the cost. A basic co-founder agreement review typically runs $500 to $1,500 with a small business attorney, which is far less than litigating a dispute later.
How should co-founders sign their agreement?
E-signatures are legally binding for co-founder agreements in the US under the ESIGN Act and in the EU under the eIDAS regulation. Use an e-signature tool that records a full audit trail with signer identity verification. Keep a signed copy accessible to both parties, not buried in someone’s email inbox.