A fair cofounder equity conversation begins with the partnership each person is agreeing to build, then considers ownership alongside commitment, authority and departure. There is no percentage calculator that can settle those questions for every company.
This article is a discussion framework, not legal, tax or investment advice. Before issuing shares, promising equity or relying on an agreement, consult qualified professionals who understand your jurisdiction, company structure and the actual arrangement. A friendly conversation is not a substitute for appropriate documents.
Explain the future before defending the past
Founders often arrive with an inventory of earlier work: an idea, a prototype, contacts or time already spent. Those contributions deserve an honest account. They do not describe all the work the company will need next.
Write down what each person is expected to own over the coming period. Include less visible responsibilities such as customer support, commercial negotiation, reliability and difficult personnel decisions. Explain which responsibilities remain unassigned and how the arrangement may change.
Michael Seibel's YC essay argues for considering the work still ahead. Treat it as a venture startup perspective to discuss, rather than a rule that automatically determines every company's split.
Separate questions that a percentage hides
Equity, salary, decision authority and cash contributed to the business are related but distinct. Do not expect a single ownership number to communicate all of them. A person can hold shares and still lack clarity about what they are expected to do or decide.
Discuss these areas explicitly:
- What time and responsibility is each person committing now?
- What would trigger a change in that commitment?
- How will compensation be considered when the company can support it?
- Which decisions need agreement, consultation or a designated owner?
- How should earlier work, cash or intellectual property be handled?
- What happens if someone leaves, cannot continue or changes roles?
Record questions for professional advisers instead of improvising legal conclusions. Different instruments, tax treatment and employment relationships may create consequences that a founder conversation cannot resolve on its own.
Make room for independent thinking
Each person should have time to write down their expectations before hearing a proposed number. Avoid presenting an offer at the end of an exhausting meeting and asking for immediate agreement. A decision that will shape a long relationship deserves space to be understood.
Invite the other person to explain what would feel unfair and why. Listen for the underlying concern: recognition, security, meaningful authority or fear of being left with all the difficult work. Those concerns may require a change to the arrangement, not just a different fraction.
If you disagree, do not turn the conversation into a debate over who is the “real founder.” Ask what each person believes the partnership actually is. Sometimes the disagreement reveals that one person expects a cofounder relationship while the other expects a senior employee.
A hypothetical discussion
Suppose one founder has built an early prototype and another is considering joining to own customer development and delivery. The first proposes a large difference in ownership because the prototype already exists. The second worries that the next several years of customer work are being treated as an accessory.
Instead of bargaining immediately, they describe the proposed responsibilities. They realise that neither has budgeted time for ongoing support. They also disagree about when the new partner would become full time. Those facts materially change the conversation.
They pause the percentage discussion, do a bounded collaboration and speak with legal and tax advisers about the eventual structure. They might agree on a partnership, choose employment or decide not to work together. The fair part is an informed process with real choice, not a particular numerical result.
Discuss departure before it becomes personal
Nobody enjoys planning for a partnership ending. It is still worth asking how customers, work, access and ownership would be handled if someone could not continue. Illness, family responsibilities and changing circumstances should not be treated as evidence of bad character.
Ask advisers to explain relevant mechanisms and consequences in plain language. Make sure both people understand the same documents. Do not copy a foreign template and assume that its terminology, enforceability or tax effects apply to your situation.
YC includes ownership among the topics to discuss before committing.
Leave with a clear next step
A productive meeting can end without agreement. Write down what you understand, what remains unresolved and which questions need professional input. Set a follow-up date that gives both people enough time to review, ask questions and obtain independent advice.
Do not make customer commitments, announce a founding team or imply ownership is settled while the important issues remain open. Equally, avoid using a never-ending equity discussion to obtain ongoing work without a proper arrangement.
A fair conversation leaves each person able to explain what they are accepting, what they will contribute and what could happen if circumstances change. That clarity is more valuable than reaching a quick number nobody feels safe questioning.