The Co-founder Agreement: Everything You Need to Cover Before You Build

The co-founder agreement is the least glamorous founding document and the most important. It's the contract that governs what happens in scenarios that every founding team hopes to avoid but a majority will face: disagreements, departures, and changing roles.

Done well, it protects the company and both founders. Done poorly — or not done — it creates ambiguity that becomes expensive at the worst possible moment.

What a co-founder agreement is and isn't

A co-founder agreement is not the same as the Shareholders' Agreement (SHA). The SHA governs the relationship between all shareholders (including investors) and the company. The co-founder agreement is a bilateral document between co-founders that covers the operating relationship: roles, decision rights, compensation, and departure mechanics.

You need both. They serve different purposes.

Equity split: the conversation to have first

Before drafting anything, the co-founders need to agree on equity percentages. This is the most emotionally loaded conversation in any founding relationship, and the temptation to avoid it by defaulting to 50/50 is strong.

50/50 is the right structure when contributions are genuinely equal — same amount of time, same risk, similar skills with equivalent value. It's the wrong structure when one founder came up with the idea and spent 6 months building before bringing in a co-founder, or when one founder is keeping a well-paying job while the other is full-time.

The honest framework for deciding:

• Who came up with the idea?
• Who built the first version?
• Who is taking more financial risk?
• Whose contribution is harder to replace?
• Who will be doing more of the most critical work in the next 12 months?

A 60/40 or 70/30 split that reflects reality is better for the company — and ultimately the relationship — than a 50/50 split that quietly breeds resentment.

Vesting: non-negotiable

Every co-founder's equity should vest over time. Without vesting, a co-founder who leaves in year one keeps their full stake, which:

• Leaves dead equity in the cap table that investors will scrutinize
• Means the remaining founders are working to create value for someone who contributed far less
• Creates a structurally unfair outcome that corrodes trust

Standard: 4-year vesting with a 1-year cliff. In India, this is implemented via a Repurchase Agreement or reverse vesting agreement — the company holds the right to buy back unvested shares at face value if a founder departs.

Include acceleration provisions: if the company is acquired, does unvested equity vest immediately (single trigger)? Or only if the founder is also terminated post-acquisition (double trigger)? Double trigger is more investor-friendly.

Decision rights: who decides what

The most practical section of a co-founder agreement is often the clearest predictor of future conflict: who has the authority to make which decisions?

Organize decisions into three tiers:

Founder A (unilateral decision authority):

• All decisions within [domain A, e.g., product and engineering]
• Hiring decisions for team members in [domain A]

Founder B (unilateral decision authority):

• All decisions within [domain B, e.g., sales, marketing, operations]
• Hiring decisions for team members in [domain B]

Joint decisions (both founders must agree):

• Hiring above a certain seniority level (e.g., any Director+ or salary above Rs X)
• Taking on debt or financial commitments above Rs Y
• Pivoting the core product direction
• Accepting or rejecting a term sheet or acquisition offer
• Any contract worth more than Rs Z

The specific thresholds matter less than the clarity. When you're in the middle of a disagreement, having written rules that both founders pre-committed to removes the emotional charge from the decision.

IP assignment

Both founders must assign all intellectual property related to the company to the company. Not to themselves, not to a holding entity — to the operating company. This includes:

• All code, designs, and creative work done before and after founding
• All business ideas and inventions related to the company's domain
• Customer relationships and materials

Without clear IP assignment from both founders, the company doesn't cleanly own its most valuable asset.

Departure mechanics

What happens when one founder leaves? The agreement should cover:

Good leaver vs. bad leaver: define both. A good leaver (resigned for legitimate personal reasons, completed transition) keeps vested equity and gets the company's help with the transition. A bad leaver (fired for cause, poached a key employee) may have different rights.

Non-compete and non-solicitation: departing founders should agree not to work for direct competitors or poach team members for a defined period (12–24 months is typical in India).

Knowledge transfer: the departing founder is obligated to complete a reasonable knowledge transfer period.

The buyout mechanism: if the remaining founder wants to buy out the departing founder's unvested shares, the mechanism for pricing and payment should be pre-agreed.

The conversation you need to have, not just the document you need to sign

The agreement is only as useful as the conversation that created it. Before you engage lawyers, sit with your co-founder and discuss every scenario the document covers. Agree on the principles first; document second.

Lawyers can draft an agreement. They can't create the shared understanding of intent that makes the agreement meaningful when things get hard.