Skip to content
corppy.

Adding a cofounder

A cofounder is not a row on a cap table. It is a change to the company.

Decide the work, economics, control, vesting, and exit rules first. Then approve and document the actual ownership change through the process your entity requires.

agreement first, spreadsheet second

First decide what “cofounder” means.

Cofounder is a working label, not one universal legal role. The person might become an LLC member, a shareholder, a director, an officer, an employee, a contractor, or several of those at once. Each role creates different rights and paperwork.

Ownership answers who participates economically. Governance answers who votes or manages. Employment answers how the person works and is paid. Intellectual-property documents answer what inventions, code, brand assets, and prior work belong to the company. Do not use one vague promise of “equity” to answer all four.

Before negotiating a percentage, identify what already exists: cash, product, users, contracts, liabilities, and work contributed by the original founder. Then identify what the new person is committing and over what period. The agreement should fit those facts rather than a generic equal-split slogan.

The clean way to make the change.

  1. 01

    Read the current governing documents

    The operating agreement, bylaws, shareholder agreements, existing grants, and state law determine who can approve a new owner and what limits already exist. Check transfer restrictions, pre-emptive rights, consent thresholds, authorized shares, and whether an amendment is needed.

  2. 02

    Write the commercial deal in plain language

    Record the role, expected commitment, ownership or compensation, vesting, decision rights, confidentiality, intellectual-property assignment, and what happens if either founder leaves. Resolve the uncomfortable cases while both people still want the deal to work.

  3. 03

    Choose the legal instrument

    The company might issue new shares or units, transfer part of an existing owner's interest, grant an option, or use another approved arrangement. Those paths can affect dilution, consideration, securities compliance, and tax. Counsel and a tax professional should review the specific structure.

  4. 04

    Approve and complete the actual issuance or transfer

    Obtain the board, member, manager, or shareholder approvals the documents require. Sign the purchase, grant, joinder, amendment, and IP documents. Collect any payment. Ownership should change only when the required acts are complete, not when someone edits a spreadsheet.

  5. 05

    Review the tax consequences immediately

    Restricted equity can make an 83(b) election relevant, while adding an owner to a single-member LLC can change its default federal tax classification. The IRS Form SS-4 instructions specifically address an LLC that acquires additional owners. Get advice from the real documents, not after the first return is due.

  6. 06

    Update every record that should now agree

    Update the cap table or member ledger, certificates, ownership schedule, tax records, bank authority, beneficial-owner records required by the bank, and internal contact list. Check whether the state requires an amendment or allows the change in its next report. The SBA compliance guide notes that membership or share changes may require articles of amendment.

Three shortcuts that create long problems.

“We will sort the paperwork later.” Later often arrives during fundraising, a dispute, or a tax filing. By then the parties may disagree about what was promised and when ownership began.

“The cap table proves it.” A cap table summarizes approved transactions; it does not replace approvals, signed agreements, payment, or an issuance. If the source documents and table conflict, diligence stops at the conflict.

“Cofounder means equal everything.” Equal economics, voting, management, and employment are separate choices. A deliberate split can be equal, but it should also explain deadlocks, departures, and future financing. This page is general information, not legal or tax advice.

Start with company records you can safely change later.

Corppy forms the company and keeps its core documents together, ready for the next careful decision.

Start your company →

Get founder-friendly updates.

Compliance tips, product news. No spam.