Business Partnership Agreements in Missouri (You May Already Be in One)
Revised July 28, 2026
Do you need a partnership agreement in Missouri?
In Missouri you can be in a legally binding partnership without signing anything — no filing creates one. Two or more people carrying on a business for profit as co-owners is a general partnership. And if you never write an agreement, the state has written one for you: under RSMo 358.180 profits split equally regardless of who contributed what, and under RSMo 358.150 partners are liable jointly and severally — a creditor can pursue one partner for the whole debt, including one the other partner ran up, reaching personal assets. ⚠️ Have an LLC? RSMo 347.081.1 requires an operating agreement, even single-member — it’s just never filed with the state, which is why most owners don’t know.
Keep reading ↓Do you need a partnership agreement in Missouri?
Here is the part that catches people: in Missouri you can be in a legally binding partnership without ever signing anything.
No filing creates a general partnership. Under Missouri’s partnership law, one exists as soon as two or more people associate to carry on a business for profit as co-owners. No paperwork, no registration, no conversation about it. Two friends doing jobs together and splitting the money have very likely formed one already.
Which matters enormously, because if you never write an agreement, the state has already written one for you — and its default terms are almost certainly not what you had in mind.
Search this topic and you will get a wall of template vendors. Page one right now is LawDepot, Rocket Lawyer, Legal Templates, eForms, Signaturely, Nitro. All selling the same document, none explaining what Missouri law does to you in the meantime.
Are you already in a partnership without knowing?
Because formation requires no paperwork, the question is worth asking honestly. A few situations that commonly qualify, or come uncomfortably close:
Two tradespeople splitting jobs. You quote together, work together, split the money, and each pay your own taxes on your share. There is no company and no contract — but you are carrying on a business for profit as co-owners, which is the statutory test.
A friend who came in to help and stayed. It started as a favor, then they were doing half the work and taking half the money. Nobody ever named the arrangement. The law does not require anyone to name it.
The person who put up money for a share of profits. If they are getting a cut of profits rather than repayment of a loan, that looks a great deal like a partner — with the liability and the say that implies.
A spouse or family member working the business with you. Extremely common, almost never documented, and it becomes the central question in a divorce or an estate.
Contrast those with arrangements that generally are not partnerships: an employee on payroll, a genuine subcontractor invoicing you for work, or a lender being repaid a fixed amount regardless of how the business performs. The dividing line is usually sharing profits as co-owners rather than being paid for work or capital.
If any of the first four describe you, the useful thing is not alarm — it is that you can document it now. An agreement signed today can define contributions, split, authority and exit going forward, and that is a far better position than discovering the default rules during an argument.
What Missouri's default rules actually say
Three of them do real damage, and every one is reversible by an agreement you have not written yet.
1. Profits split equally — no matter what you put in
Under RSMo 358.180, absent an agreement each partner shares equally in profits and surplus, and contributes toward losses in proportion to their share of profits.
Read that against how these things usually start. One person puts in $40,000 and the truck; the other puts in labor and a client list. The default rule does not care. Fifty-fifty, unless you agreed otherwise in a way you can prove.
Nobody argues about this while the business is working. It surfaces the first time there is a genuinely large check, or when one partner starts doing visibly less.
2. You are liable for what your partner does
RSMo 358.150 makes partners liable jointly and severally for everything chargeable to the partnership and for its other debts and obligations.
“Severally” is the word that costs money. It means a creditor does not have to chase you both proportionally — they can pursue whichever partner can actually pay, for the whole amount. If your partner signs a lease, orders materials, or runs up an obligation in the partnership’s name, that debt can land entirely on you, and it reaches your personal assets because a general partnership offers no liability shield at all.
This is the single strongest argument for an LLC over a handshake partnership, and it has nothing to do with taxes.
3. Missouri is running on a 1914 statute
Missouri’s partnership code is Chapter 358 — the 1914 Uniform Partnership Act. Many states have since moved to the substantially revised 1997 version. Missouri has not.
The practical consequence is that generic advice written for “most states” can quietly describe rules that are not yours. It is another reason a template downloaded from a national site is a starting point rather than an answer.
If you have an LLC, Missouri requires an operating agreement
This one surprises nearly every LLC owner we mention it to.
RSMo 347.081.1 states that the member or members of a limited liability company shall adopt an operating agreement. Not “may.” It applies to single-member LLCs too.
What confuses people is that you never file it. The Secretary of State does not want it and will not ask for it, so a great many Missouri LLC owners complete their $50 formation, receive nothing further, and reasonably conclude there is nothing further. The obligation sits quietly in the statute.
Missouri also declares a policy of giving maximum effect to the principle of freedom of contract and to the enforceability of operating agreements. Read that as encouraging: what you write down is very likely to be honored. Which is only useful if something is written down.
What actually belongs in it
Skip the boilerplate for a moment. These are the clauses that decide whether a disagreement becomes a conversation or a lawsuit.
Who contributed what, in writing. Cash, equipment, vehicles, client lists, and the value assigned to each. Also whether later contributions are loans or additional equity — the difference matters enormously if the business is ever sold.
How profits split, and when money comes out. Ownership percentage and distribution schedule are separate questions, and partners routinely assume the same answer to both.
Who can bind the business. What one partner can sign alone, and what needs both. Given joint and several liability, this is the clause protecting your house.
How decisions get made at a tie. Two equal partners deadlock eventually. Name the tiebreak — a third party, a coin, an area of final say each — before you need it.
What counts as work. The most common quiet resentment in a small partnership is one person feeling they carry more. Hours, roles, and what happens if someone stops showing up.
The exit. Covered below, because almost nobody writes it and it is the clause that matters most.
The clause nobody writes
Every partnership ends. Someone retires, moves, gets divorced, gets sick, wants out, or dies. The agreement’s real job is to describe that day while everyone still likes each other.
How is a departing partner bought out, and at what valuation? “Fair market value” is not a formula — it is a future argument. Write the actual method.
Can a partner sell their share to a stranger? Without a right of first refusal, you may find yourself in business with someone you have never met.
What happens on death or disability? Absent terms, a partner’s interest can pass to their estate, which means negotiating the future of your business with a grieving spouse.
Who keeps the name, the phone number, and the customer list? For a local service business this is frequently worth more than the equipment, and it is the fight we see most often. The listings, the reviews, the number people have saved — decide now who walks away with them.
The honest limits of a template
A template is better than nothing, and nothing is what most partnerships have. Use one to structure the conversation.
But understand what you are getting: a national form written for no particular state, sold by a company whose product is the form. It will not know that Missouri runs the 1914 act, and it cannot referee the buyout formula you and your partner have been avoiding.
There is also a timing point worth being blunt about. The best moment to write this is the moment you least want to — at the start, when everyone is optimistic and raising the topic feels like distrust. Every partner who has been through a bad split will tell you the same thing: the conversation that felt awkward in month one is the one that would have saved them in year three. Framing helps. This is not a document about what happens if you stop trusting each other; it is a document about what happens if someone gets sick, gets divorced, or gets an offer.
An hour with a Missouri business attorney, while you still agree, is inexpensive relative to any version of the alternative. If you are going to skip that, at least write the exit terms yourselves and both sign them — a rough document you actually negotiated beats a polished one nobody read.
And if you are still deciding the shape of the business, the structure question comes first: our guide to what it costs to start a business here covers LLC versus sole proprietor, and what licensing you actually need covers the local layer.
Frequently asked questions
Do you need a partnership agreement for an LLC?
In Missouri an LLC needs an operating agreement — RSMo 347.081.1 says the members shall adopt one, including single-member LLCs. It is never filed with the Secretary of State, which is why so many owners do not realize the obligation exists. Missouri law expressly favors enforcing what members agree, so what you write down carries real weight.
How to make a business partnership agreement?
Start with the hard conversations, not the document: contributions and their agreed values, profit split, who can bind the business, how deadlocks break, what counts as work, and how someone exits. Write the answers down, then have a Missouri business attorney review it. A template can structure the discussion but cannot settle the terms for you.
What are 6 items included in a partnership agreement?
Typically: contributions and ownership percentages; how profits, losses and draws are divided; each partner’s authority to act for the business; a decision-making and deadlock process; what happens on death, disability or withdrawal; and a dissolution or buyout method. For local service businesses, add who keeps the business name, phone number and customer list.
What are the 4 types of partnership in business?
Broadly: general partnerships, limited partnerships, limited liability partnerships, and partnerships at will. The important distinction for most small Missouri businesses is that a general partnership forms automatically with no filing and gives no liability protection, while the others require formal steps and change who is exposed to the debts.
What are the disadvantages of a partnership?
The largest is joint and several liability — under RSMo 358.150 a creditor can pursue one partner for the full amount of a partnership debt, including obligations the other partner created, and a general partnership shields no personal assets. Add the default equal profit split regardless of contribution, and the fact that disagreements have no referee unless you appointed one.
Can you have a partnership without a written agreement in Missouri?
Yes, and that is precisely the risk. A general partnership arises automatically from two or more people carrying on a business for profit as co-owners — no signature needed. Missouri’s default rules then govern: equal profit shares under RSMo 358.180 and joint and several liability under RSMo 358.150, whatever you each believed you had agreed.
One clause worth settling early: who keeps the listings. For a local service business, the name, the phone number, the reviews and the directory entries are often worth more than the van — and they are the thing partners fight hardest over, because customers have them saved. Decide now, in writing. Listing your business takes a few minutes, and it is worth knowing whose it is.
The rest of the setup: LLC or sole proprietor, licensing, and buying someone out. Or browse local pros on St Louis Near Me Directory.
Written by a dedicated team of St. Louis locals who live, work, and play right here in the St. Louis metro. Founder Lane Forman and team are committed to building the region’s most trusted directory by verifying listings and connecting local businesses with loyal customers across Missouri and Illinois.