Written & reviewed by NotALawyer Review AI · Updated June 26, 2026
Short answer: in most states you're not legally required to have an operating agreement for a single-member LLC — but it's still worth creating one. The agreement is an internal document that spells out how the LLC is owned and run, and it helps show that your LLC is a real, separate entity, which reinforces the liability shield that's the whole point of forming one. Banks, lenders, and investors also frequently ask to see it. A few states do require one by statute, so it's worth checking your state's rule.
It's the rulebook for your LLC: who owns it, how profits are split, who can make decisions, and what happens if you bring on a partner or wind the business down. Even with one owner, writing it down sets your own defaults so the business runs on your terms instead of your state's generic fallback rules.
One way courts decide whether to 'pierce' an LLC's shield is by asking whether the owner treated it as a genuinely separate entity. Having an operating agreement — and actually following it — is part of the paper trail that shows the LLC is real and not just you under another name.
Most states let you form and run an LLC without ever signing an operating agreement. A handful of states require one by law, though they generally don't make you file it with the state — you just have to have it. Check your state's LLC statute or official business page.
When you open a business bank account, apply for financing, or take on a co-owner or investor, you'll often be asked for the operating agreement to prove who controls the company. Not having one can slow those steps down.
Say you run a solo design studio as an LLC and a friend later wants to buy in for 30%. An operating agreement written up front — covering how new members join and how profits split — turns that conversation into filling in a form rather than starting a negotiation from scratch.
More on this topic: the Small Business hub
NotALawyer.com provides general legal information, not legal advice.