Type "LLC operating agreement" into Google and you’ll run into the same claim on site after site: five states require one. California, Delaware, Maine, Missouri, and New York.
That’s technically defensible but practically misleading. Only one of those states has a law that says, in plain language, you must put it in writing. The other four mean something looser by "require," and the difference matters if you’re trying to decide whether to actually sit down and write one.
What an operating agreement actually is
An operating agreement is an internal contract between the owners (called members) of an LLC. It covers who owns what percentage of the company, who makes day-to-day decisions, how profits and losses get split, and what happens if someone wants out.
It isn’t the same document as the Articles of Organization. The articles are what you file with the state to create the LLC in the first place: name, registered agent, address, sometimes the members’ names. The operating agreement is what you keep in your own files. No state agency reviews it, approves it, or even sees it, in any of the 50 states.
The one state that actually requires it
New York is the real outlier. Under New York LLC Law Section 417, every LLC formed in the state has to adopt a written operating agreement within 90 days of filing its Articles of Organization. It doesn’t get filed with the Department of State, but it has to exist, in writing, on a real timeline. Skip it and, combined with New York’s separate newspaper publication requirement, the state can suspend your LLC’s authority to do business.
That’s a genuine legal deadline with a real consequence attached. Nothing else on the "five states" list works quite the same way.
What Delaware, Maine, and Missouri actually say
These three states get lumped in with New York because their LLC statutes mention the operating agreement as something that governs the company whether or not one exists. Delaware’s LLC Act, for instance, allows the agreement to be oral, written, or simply implied by how the members run the business. Maine and Missouri work the same way.
Read that again: the agreement can be unwritten. What these statutes are really saying is that some set of rules always governs an LLC, either the one the members agree to, on paper or by handshake, or the default rules built into the state’s LLC statute if the members never spell anything out. That’s a meaningfully different claim from "you’re legally required to draft and sign a document," and it’s not what most people picture when they read "required" on a list like this.
California doesn’t actually mandate one either
California shows up on nearly every version of this list, but the relevant statute, Corporations Code Section 17701.11, doesn’t contain a requirement. It says an LLC is bound by its operating agreement if one exists, and that anyone who becomes a member is treated as having agreed to it. There’s no line saying a California LLC must have one, written or otherwise. A written agreement is still worth having, for the reasons below, but it isn’t a legal mandate the way New York’s is.
Why you’d want one even where it isn’t required
None of this means skipping the operating agreement is a good idea in the other 45 states. Two practical reasons come up constantly.
Banks ask for it. Plenty of banks will open a business account with just your EIN and formation documents, but many, especially for a multi-member LLC, want to see a signed operating agreement before they’ll let anyone move money. Showing up without one can mean a second trip.
It backs up your liability shield. Courts that pierce the corporate veil, meaning they hold an LLC’s owners personally liable for the company’s debts, often point to owners who never treated the LLC as a separate entity in the first place. A written operating agreement is evidence that you did. That connects directly to the liability question we cover in sole proprietorship vs LLC: the LLC’s protection isn’t automatic, and paperwork like this is part of what makes it hold up in practice.
Single-member vs multi-member: does it matter more for one?
It matters differently for each, not more for one than the other.
For a multi-member LLC, the operating agreement is what keeps a disagreement between co-owners from turning into a legal fight. Ownership percentages, who has the final say on big decisions, how profits get split if it isn’t a straight even share, and what happens if one member wants to leave or sell their stake: none of that is obvious without something written down.
A single-member LLC doesn’t have co-owner disputes to worry about, but the document still does two jobs. It satisfies the bank question above, and it draws a clear line between the owner and the business, which is exactly the line courts look for when someone argues the LLC was never really separate from its owner.
What actually goes in one
A reasonably complete operating agreement covers:
- Ownership and contributions: each member’s percentage stake and what they put in to get it, cash, property, or work.
- Management structure: whether members run the company directly (member-managed) or hand day-to-day control to an appointed manager (manager-managed), and who has authority to sign contracts or open accounts.
- Voting: what requires unanimous consent versus a simple majority.
- Profit and loss distribution: without this spelled out, most states default to splitting everything by ownership percentage, which isn’t always what the members actually intended.
- Membership changes: what happens if someone wants to sell their stake, leaves, or dies, and whether the remaining members get a right of first refusal.
- Dissolution: the process for winding the company down if the members decide to close it.
Some LLC formation services, including a few we cover on this site, bundle a basic operating agreement template into their formation packages or sell one as an add-on. We haven’t tested those templates against each other yet. When we have, that comparison will live on How We Test.
Do I need a lawyer to write an LLC operating agreement?
Not necessarily. A single-member LLC with a simple structure can often use a solid template and fill in the specifics. A multi-member LLC with uneven ownership, outside investors, or a complicated buyout arrangement is a much better candidate for an hour with a business attorney, since that’s exactly the kind of detail that turns into an expensive dispute if it’s left vague.
Does a single-member LLC need an operating agreement?
Not legally, in most states. But it’s still worth having, mainly for opening a bank account without friction and for reinforcing that the LLC is a separate legal entity from its owner.
Can I write my own operating agreement without a template?
Yes. No state’s law requires a specific form or wording. The risk with skipping a template entirely is leaving out a clause you’ll wish you had later, like what happens if a member stops participating but won’t sell their stake.
What happens if my LLC doesn’t have an operating agreement?
The state’s default LLC rules apply instead. Those defaults are usually generic: equal profit splits regardless of who contributed what, and standard voting rules that may not match what the members actually want. The company still exists and still gets its liability protection either way, but the internal terms are the state’s, not yours.
