Missouri LLC governance: a statute that orders you to have an operating agreement, then leaves the important gaps to it

Most states treat the operating agreement as optional. You can form an LLC, never sign one, and the statute fills every gap. Missouri is different in a way worth noticing: its LLC act says the members shall adopt an operating agreement. That is a command, not a suggestion, and it changes how you should think about a Missouri LLC. The statute is telling you the document is not an accessory. It is the thing that runs the company, and Missouri leaves the most important internal rules, including what duty your managers owe, to be set in it rather than dictating them.

That posture, mandatory agreement plus maximum freedom of contract, is the frame for everything else on this page. This page leads with it rather than re-teaching the general mechanics on the site’s default rules and freedom of contract guides. In Missouri, the statute hands you the pen and tells you to use it, and the defaults that apply if you do not are thinner and stranger than most owners expect.

The statute that requires the agreement

Start with the command, because it is unusual and it sets up the rest.

Missouri’s LLC act says the members shall adopt an operating agreement, unlike most states, where the agreement is optional.

RSMo 347.081.1 provides that the member or members of an LLC shall adopt an operating agreement containing whatever provisions they deem appropriate, subject to the act. Most state statutes say an LLC may have an operating agreement; Missouri says shall. You do not file it with the Secretary of State, so it stays an internal document, but the statute is explicit that a Missouri LLC is expected to have one, and that includes a single-member LLC. The reason the command matters is on the next section: Missouri does not pair the mandate with a rich set of default rules that would make the agreement redundant. It commands the document precisely because the document is where the important choices live.

Alongside the command sits a strong contractarian policy.

Missouri declares that its LLC act exists to give maximum effect to freedom of contract and the enforceability of operating agreements.

RSMo 347.081.2 states that the policy of the act is to give the maximum effect to the principle of freedom of contract and to the enforceability of operating agreements. So the agreement Missouri requires is also an agreement Missouri promises to enforce as written. That combination, a mandate to have the document and a policy to honor it, means the leverage in a Missouri LLC sits almost entirely in the drafting. What the parties write, they generally get.

The default duty, set to a corporate-officer standard

Here is the seam, and it is a place where a lawyer or a manager should pause.

Missouri’s default duty of care for an LLC is the care a corporate officer would exercise, and the operating agreement can modify or eliminate it.

RSMo 347.088.1 provides that, except as otherwise provided in the operating agreement, an authorized person must discharge their duties in good faith, with the care a corporate officer of like position would exercise under similar circumstances, in the manner a reasonable person would believe to be in the best interest of the company. That default is worth reading closely for two reasons. First, the standard is borrowed from corporate law: a Missouri LLC manager is measured by the care a corporate officer owes, not the utmost-loyalty standard some states import from partnership law. Second, and more important, the entire duty is prefaced by “except as otherwise provided in the operating agreement,” which means the agreement can raise it, lower it, or contract it away. So what a Missouri manager actually owes is not fixed by the statute; it is whatever the mandated operating agreement says, measured against a corporate-officer baseline only where the agreement is silent. A member relying on a duty and a manager relying on a waiver are both reading the same document, which is why the drafting decides the dispute.

The defaults that fill the rest, thinly

Because Missouri leans on the agreement, its statutory defaults are lighter than in states that legislate the internal rules in detail.

If a Missouri operating agreement is silent on when to distribute, distributions are made when a majority of the authorized persons approve.

RSMo 347.101 provides that distributions before dissolution are made at the times the operating agreement specifies, or, if it does not specify, when a majority of the authorized persons approve, subject to the insolvency limits in 347.109. Notice what the statute does and does not do: it supplies a default for the timing of distributions but leans on the agreement for the sharing ratio and the allocation of profit and loss, which 347.081 lists as things the agreement sets. So a Missouri LLC that never decided how to split distributions has resolved the timing question by statute and left the harder question, who gets how much, to a document that may not address it. Management defaults to the members under RSMo 347.079 unless the articles provide for managers. The through-line is consistent: Missouri gives you a mandate to write the agreement, a promise to enforce it, and a set of defaults thin enough that skipping the drafting leaves real questions unanswered. Treat the operating agreement as the substance of the entity, because the statute does.

The bottom line

Missouri’s LLC act requires members to adopt an operating agreement under RSMo 347.081.1, unusual language in a field where most states make it optional.

The act’s stated policy under 347.081.2 is to give maximum effect to freedom of contract, so the agreement Missouri requires is also one it enforces as written.

The default duty of care under 347.088.1 is the care a corporate officer would exercise, and the agreement can raise, lower, or eliminate it, so a manager’s duty is set by the document, not the statute.

The distribution default under 347.101 fixes only timing, by majority approval, and leaves the sharing ratio and allocations to the agreement.

Management defaults to the members under 347.079, and the consistent lesson is that in Missouri the operating agreement carries the weight the statute deliberately declined to carry.

What this page does not cover

This page is about the rules that run your company from the inside. How outside creditors reach a member’s interest, the case-law charging order, and the insurance point in veil piercing are on the protection page. Missouri’s capital gains exemption, the series LLC, and the absence of any transfer tax are on the structure and cost page. The $50 formation fee and the fact that Missouri requires no annual report at all are on the filing page.

Last verified August 2026.