Cofounder Equity Splits and Vesting: Questions to Resolve Together

Before suggesting percentages, write down the intended roles, time commitments and responsibilities. Identify what each person has already contributed and what remains to be done. Distinguish an ongoing founder commitment from a short project or an advisory role. Those relationships may need different arrangements, and a title alone does not resolve the distinction.

Include constraints that could affect future contribution: an existing job, personal income needs, an uncertain relocation or an asset that cannot yet be transferred. Describe these facts without turning the conversation into a competition over sacrifice. The goal is an arrangement the founders can explain and support after the initial excitement has passed.

In his YC essay, Michael Seibel recommends equal or near-equal founder splits and emphasizes the work still ahead. Treat that as a stated recommendation for founding teams, rather than a universal legal or financial rule. Read the YC equity discussion. Your circumstances still need their own analysis.

Test the explanation behind any proposed allocation. Does it reflect enduring responsibility or mainly reward the person who first described the idea? Can each founder explain why the arrangement is reasonable? If the team cannot discuss the issue openly, pause before formalizing it. A spreadsheet formula can calculate percentages, but it cannot settle differing expectations about partnership.

Vesting introduces a time- or condition-based structure around the founder’s equity arrangement. Its implementation can involve rights and restrictions that are more detailed than saying shares are earned each month. Cooley GO explains that founder vesting and departure arrangements deserve deliberate documentation and discussion with counsel. Read Cooley’s overview.

For a hypothetical arithmetic example, assume a grant covering 48,000 shares uses a four-year schedule, monthly vesting and a one-year cliff. Under that simplified schedule, 12,000 shares would vest at the cliff and 1,000 each month afterward. This illustrates a schedule, not a recommendation or the complete legal effect of leaving. The actual documents determine the rights and procedures that apply.

Consider several possible futures before signing: one founder leaves early, a role changes, the company needs outside funding, or a founder can no longer work full time. Ask what each person thinks happens in each case. If the answers differ, the arrangement is not yet understood, even if everyone agrees on the headline percentages.

Keep ownership and control questions distinct. A founder’s economic interest, operating title and authority to make decisions are related but separate matters. Do not assume that choosing a slightly unequal split automatically solves governance. Ask advisers to explain how the company’s documents work together and which decisions need formal approval.

Cooley’s founder-stock guidance explains that an informal division of ownership can leave stock issuance and intellectual-property contributions unresolved. A mutual understanding therefore needs an appropriate implementation process. Read the founder-stock explanation. Obtain legal and tax advice for the actual entity, locations and contributions involved before relying on a structure.

Prepare a short adviser brief with the founders, proposed responsibilities, ownership expectations, prior assets and unresolved scenarios. Ask who the adviser represents and whether individual advice is needed. This article is a conversation aid, not an agreement or equity calculator. For the broader relationship issues, use the founder-agreement discussion guide.

Explore Co-Founder Match if your next step is finding a complementary founding partner.