Cofounder Agreement Guide: Equity, Vesting & IP

Your Startup’s Prenup: A Tactical Guide

You’ve found your cofounders. The energy is electric. Stop. Before you write a line of code, sketch a wireframe, or talk to a single customer, you must have the most difficult and important conversation of your startup’s life.

A cofounder agreement isn’t a formality, it’s the foundation. Skipping this step or getting it wrong is the most common unforced error that kills early-stage companies. It’s not a lack of product-market fit or a bad fundraise; it’s two founders in a shouting match over who owns what because they never wrote it down.

This is your startup’s operating system for the partnership. Let’s build it right.

First, Shift Your Mindset

Founders avoid this conversation because it feels transactional and signals a lack of trust. The opposite is true. Publicly demonstrating you can navigate hard, awkward conversations about money and power is a massively positive signal to each other and future investors.

An investor’s first question during due diligence will be, "Where’s your cap table and cofounder agreements?" Showing up with a messy, unwritten understanding is an immediate red flag. A clean, thoughtful agreement shows you are professional operators who anticipate and mitigate risk.

The Three Core Conversations

A great cofounder agreement is the output of three honest conversations. Don't start with a legal template. Start by debating and aligning on these points. Write them down in plain English. This becomes the term sheet you take to a lawyer.

1. Equity: Who Gets What and Why?

The default for two founders is often a 50/50 split. It feels fair and avoids a hard conversation. This can be a mistake. Equity should be a reflection of past, present, and future contribution. An unequal split is often the fairer outcome.

Use a framework to guide the discussion. Don't just guess. Score each founder on a few key variables:

Idea & Pre-Work: Who conceived the initial idea? Who built the initial prototype or did the early market research? This person deserves credit. (Weight: 10-20%) · Capital Contribution: Is someone putting in significant cash to get things started? Track this separately as a loan or calculate its value in equity. A good rule of thumb is to value cash at a 1.5-2x premium. ($20k cash might be "worth" $30k-$40k in equity.) · Expertise & Domain Knowledge: Is one founder a world-class AI researcher tackling a hard AI problem? That unique, hard-to-replace skill is worth more. (Weight: 10-15%) · Time & Commitment: Is everyone full-time from day one? If one founder is keeping their day job for a year while the other is all-in, their ownership should reflect that risk and commitment. · Future Role: The person who will be CEO, leading the company, making the final calls, and bearing the brunt of the pressure often warrants a larger share. This is the "CEO bump." (Weight: 5-10%)

The Hard Part: Have each founder independently fill out this scorecard for all founders. Then compare the results. The gaps in perception are where the real, valuable conversation happens. The goal isn't a perfect mathematical formula, but a transparent, justifiable split nobody will resent in two years.

Vesting is Non-Negotiable

All founder equity must be subject to vesting. This is the mechanism that protects the company if a founder leaves. The standard is a 4-year vesting schedule with a 1-year cliff .

How it works: You earn your equity over time. For the first 12 months, you are on a "cliff." If you leave before your first anniversary, you walk away with zero shares. On day 366, 25% of your total equity vests. After that, shares typically vest monthly for the next three years. · Why it’s critical: Imagine a founder leaves after 6 months. Without vesting, they could walk away with a huge chunk of your company for very little work. With vesting, their unvested shares return to the company’s option pool, ready to be used to hire a replacement. Investors will absolutely require this.

2. Roles & Responsibilities: Who’s in Charge?

The second critical conversation is about roles. Ambiguity here leads to turf wars and decision paralysis.

Assign Titles: Decide who is CEO, CTO, COO, etc. Titles matter. They define areas of ownership to the outside world and internally. The CEO is the ultimate decision-maker and tie-breaker. If you can't agree on a CEO, you have a major problem that investors will spot from a mile away. · Define "Final Say" Domains: Create a simple chart. Who has the final say on the product roadmap? The technical architecture? The marketing budget? The hiring of a key engineer? You don't need to document every possible decision, but you must align on who owns the big buckets. When two co-founders both think they're the final word on "product," you're destined for conflict. · Establish a Decision-Making Framework: Delineate between day-to-day decisions (which domain owners can make autonomously) and major corporate decisions that require unanimous consent or a vote. These major decisions typically include: · Selling the company · Taking on funding · Changing the company’s core mission or direction · Hiring or firing C-level executives · Taking on significant debt

3. Contribution & IP Assignment

Your company’s most valuable asset is its intellectual property. You must ensure the company, the legal entity, owns it free and clear.

Before you incorporate, any code, designs, business plans, or customer lists are owned by the individuals who created them. The cofounder agreement needs to state that each founder hereby assigns all of this "pre-incorporation" IP to the company.

Simultaneously, you will sign a Confidential Information and Invention Assignment Agreement (CIIAA) . This is a standard document that does two things:

It obligates you to keep the company’s information confidential. · It ensures that any work-related IP you create while at the company belongs to the company, not you as an individual.

This is not optional. No investor will give you a dollar without clean IP assignment from every single founder and early employee.

Plan for the Worst: Founder Departure

The final, and most uncomfortable, part of the agreement is planning for the end. What happens when a founder leaves? You must define the terms of separation while you are all still friends.

Quitting (Voluntary Departure): This is the easy case. They stop vesting, their unvested shares go back to the company. · Termination for Cause: "Cause" must be explicitly defined (e.g., fraud, conviction of a felony, gross negligence). In this case, the company often has the right to buy back even vested shares at a very low price (e.g., the original par value). This protects the company from a bad actor retaining a large ownership stake. · Termination without Cause: This is a layoff or a falling out. The founder stops vesting. The agreement needs to specify what happens to their vested shares. Typically, the company has a "right of first refusal" to buy back the shares at fair market value. · Death or Disability: The agreement should specify if equity vesting accelerates and what rights the founder's estate has.

How to Apply This This Week: Your Action Plan

Schedule the Talk: Send an email. "Hey [Cofounder], to ensure we start on the strongest possible foundation, let's block 3 hours next week to align on our cofounder agreement. I’ve put a doc together with key discussion points." · Draft a Term Sheet: Use the points in this article to create a simple document outlining your agreement on Equity Splits, Vesting, Roles, IP, and Departure Scenarios. This isn't a legal document, but the blueprint for one. · Engage a Startup Lawyer: Do not DIY your legal agreements with a template you found online. Find a lawyer who specializes in early-stage tech startups. They are worth every penny and will save you millions in the long run. Show them your term sheet—this will save significant time and legal fees.