To add a member to a Missouri LLC, start with your operating agreement, get the required consent from existing members, amend the operating agreement to reflect the new member’s ownership and terms, and update your tax setup with the IRS if you’re moving from one member to two. A filing with the Secretary of State is only required if adding the member also changes your management structure. Most of the work is internal.
Start with the Operating Agreement
Missouri law requires every LLC to adopt an operating agreement and gives that agreement maximum effect under the principle of freedom of contract.1Missouri Revisor of Statutes. Missouri Revised Statutes 347.081 – Operating Agreement, Contents – Policy Statement – Enforceability, Remedies Whatever your agreement says about admitting members controls the process for your company.
Read it before anything else. It may lay out a specific procedure, require a supermajority vote, set a minimum buy-in, or give existing members a right of first refusal. It may also be silent on the topic, in which case Missouri’s default rules apply. Skipping this step and going straight to paperwork is the most common mistake, and it creates disputes that are expensive to untangle later.
Get Consent from Every Current Member
Under Missouri’s LLC statute, admitting a new member requires the affirmative vote or written consent of every existing member, unless the operating agreement says otherwise.2Missouri Revisor of Statutes. Missouri Code 347.079 – Management of Company, Managers, Appointment, Consent of Members Required for Certain Acts That’s a unanimous default, which is a higher bar than many people expect. One holdout blocks the admission unless your agreement has relaxed the rule.
The same statute requires unanimous consent to set, modify, or release the capital contribution a new member has to make in exchange for their interest.2Missouri Revisor of Statutes. Missouri Code 347.079 – Management of Company, Managers, Appointment, Consent of Members Required for Certain Acts So the terms of the buy-in need the same level of agreement as the admission itself.
Document whatever approval process you use. If the operating agreement calls for a formal vote, keep minutes. If it allows written consent, have every member sign a consent form and keep it with your company records. That paper trail is what protects the admission if anyone questions it later.
Amend the Operating Agreement
Once existing members approve, amend the operating agreement to formalize the admission. Under Missouri law a person becomes a “member” when they are admitted in accordance with the LLC statutes and the operating agreement,3Missouri Revisor of Statutes. Missouri Code 347.015 – Definitions and the amendment is what documents that.
At a minimum, the amendment should cover:
- The new member’s ownership percentage and how the existing percentages are being adjusted.
- The capital contribution — cash, property, or services — and the agreed value.
- How profits and losses will be allocated among all members going forward.
- Voting rights, and whether they match those of existing members.
- Management role, and whether the new member will participate in management or come in as a passive investor.
Every member should sign the amended agreement, and each should keep a copy. If significant money or a complex profit-sharing arrangement is on the table, having an attorney draft the amendment is worth the cost.
When You Have to File with the Secretary of State
Adding a member does not, by itself, require a state filing. Missouri’s Articles of Organization don’t list individual members, so bringing someone new into the company usually changes nothing on the state’s record.
An amendment to the Articles of Organization is required only when one of three things happens: a change in whether management is vested in members or managers, a change in the LLC’s name, or a change in the dissolution date.4Missouri Revisor of Statutes. Missouri Code 347.041 – Articles of Amendment, Contents – Amendments Required, When If admitting your new member also flips the LLC from member-managed to manager-managed (or the reverse), that triggers a filing. If management stays the same, no filing is required.
When a filing is required, the LLC has 60 days from the triggering event to file.4Missouri Revisor of Statutes. Missouri Code 347.041 – Articles of Amendment, Contents – Amendments Required, When Use Form LLC-12, Amendment of Articles of Organization, with the Missouri Secretary of State. The filing fee is $25.5Secretary of State of Missouri. Amendment of Articles of Organization (Form LLC-12) You can set a future effective date, but not more than 90 days after the filing date.
Handle the Tax Change if You’re Going from One Member to Two
The tax consequences of adding a member can be more disruptive than the legal paperwork, especially when a single-member LLC becomes a two-member LLC. A single-member LLC is treated as a “disregarded entity” for federal tax purposes and its income flows onto the owner’s personal return. The moment a second member joins, the IRS reclassifies the LLC as a partnership by default.6Internal Revenue Service. Entities 3
New Filing Requirements
A multi-member LLC classified as a partnership files Form 1065, U.S. Return of Partnership Income, each year. The LLC itself doesn’t pay tax; it passes profits and losses through to members.7Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income Each member gets a Schedule K-1 showing their share of income, deductions, and credits, and reports it on their personal return. If you’ve been filing Schedule C as a sole owner, that stops the moment the second member is admitted. Talk to your accountant before the new member officially joins, because retroactive fixes to partnership returns are painful.
New EIN
The IRS generally requires a new Employer Identification Number when an entity’s ownership or structure changes.8Internal Revenue Service. When to Get a New EIN Moving from a disregarded entity to a partnership is exactly that kind of change. Applying is free and can be done online, and you’ll need the new number before filing your first partnership return.
Update Your Internal Records and Accounts
With the legal and tax pieces in place, several practical updates need to happen:
- Update the member ledger with each member’s percentage, capital account balance, and admission date.
- If the new member will have signatory authority, contact your bank to add them. Most banks want an in-person visit with the LLC’s EIN and a copy of the amended operating agreement.
- Review contracts, insurance policies, and business licenses for change-of-control clauses. Some commercial leases and loan agreements require lender or landlord notification when ownership changes.
- If your LLC issues membership certificates, issue one to the new member and reissue existing certificates to reflect the new percentages.
Missouri does not require LLCs to file annual reports, so there’s no recurring state filing where member information gets refreshed. Your operating agreement and internal ledger are the records that show who owns what.
Federal Beneficial Ownership Reporting
As of March 2025, domestic LLCs are exempt from filing Beneficial Ownership Information reports with the Financial Crimes Enforcement Network. An interim final rule removed all entities formed in the United States from the definition of “reporting company” under the Corporate Transparency Act.9FinCEN. Beneficial Ownership Information Reporting Only entities formed under foreign law and registered to do business in a U.S. state currently have to file. If your Missouri LLC was formed in the United States, adding a member does not trigger a FinCEN reporting obligation.