The private contract among an LLC's owners that decides who controls the company, how money is split, and what happens when someone leaves - or the state's default rules decide it for them.
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An operating agreement is the contract among the members of a limited liability company that sets the company's internal rules: who manages it, how profits and losses are shared, how decisions are voted, whether a member can sell their interest, and what happens on death, disability, divorce or a falling-out. It is an internal document. It is generally not filed with the state, and the public formation filing that creates the LLC says almost nothing about any of this.
What makes it matter is what happens without one. Every state's LLC statute contains default rules that apply to any question the members did not answer in writing, and the defaults are often not what co-owners assumed. In many states the default splits profits and votes in a way that ignores who put in more money or more work, and the default rules on leaving can make it hard for a member to get out or hard for the others to keep a departing member's share from passing to a stranger. An LLC with no agreement has an agreement; it is simply one nobody chose.
The agreement is also part of the evidence that the company is a real, separate entity. When a creditor argues that an LLC is a sham and asks a court to reach the owners personally, the absence of any written agreement, or an agreement that was signed and then ignored, is the kind of fact that argument is built on.
The time to take advice is when the LLC has more than one member and before money changes hands, because the defaults the agreement replaces are the ones that surface only when someone wants out, dies, or stops speaking to the others. A lawyer's value here is less the drafting than asking the questions co-founders avoid: what happens if one of you leaves in a year, and who decides.
Worried about the cost? A lawyer can be hired for one part of a case only (limited-scope representation), may be paid from what a claim recovers (contingency fee), or may be free through a pro bono program or legal aid; a court can also waive its own filing fees.
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