A Missouri prenuptial agreement is a written contract two people sign before they marry. It sets out who owns what, who owes what, and how property and debt are handled if the marriage ends. State law calls the document a marriage contract, and it must be in writing and acknowledged by each party, or proved by one or more subscribing witnesses.[1]
A prenup can settle assets, debt, income, business interests and inheritance rights. It cannot fix child custody or child support. A court decides those questions if the marriage ends. Start from our free printable prenuptial agreement form and set the terms that fit your family.
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It is an agreement two people sign before the wedding to fix, in advance, what each of them owns, owes and keeps. The subject is money and property: how assets and debts are split, who keeps the family home, and how a business is treated. Bank accounts, tax filing and household bills can go in it too.
The matters couples most often put in writing are:
A prenup cannot decide anything about your children. Custody and child support are set by the court in the best interests of the child, whatever your contract says.
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Missouri has no single act governing prenuptial agreements. Four sections of the Mo. Rev. Stat. do the work instead. Sections 451.220 and 451.230 set the signing and certification rules. Section 451.240 controls recording and notice, and Section 452.330 decides which property is marital.
It has not adopted the uniform premarital agreement act that many others use. The courts therefore lean on case law as well as the statutes.
Three requirements make a marriage contract valid in form. The legal bar is lower than most people expect.
All marriage contracts whereby any estate, real or personal, in this state, is intended to be secured or conveyed to any person or persons, or whereby such estate may be affected in law or equity, shall be in writing, and acknowledged by each of the contracting parties, or proved by one or more subscribing witnesses.
A common misreading of Section 451.220 is that the state demands a notary and a witness. The statute gives you a choice. Each party acknowledges the contract, or one or more subscribing witnesses prove it.
A signed prenup binds the two of you. To bind anyone else, it has to be recorded. Section 451.230 requires the contract, with its certificate of proof or acknowledgment, to be recorded in the office of the recorder of each county where affected property sits.[2]
Section 451.240 says no such contract is valid or affects any property until it is deposited for record, except between the parties and those with actual notice.[3] Once it is on file, the recording imparts full notice of its contents to everyone, for property in that county.[3]
Yes. The courts enforce these agreements, and Section 452.330 of the Mo. Rev. Stat. keeps property excluded by a valid written agreement of the parties out of the marital estate.[4] Enforcement is not automatic, though. A judge looks at how the agreement was made, not only at its content.
That means a prenup can fail even when its terms are clear. Pressure at signing, or a party who hid what they owned, can be enough for a judge to set the contract aside.
The agreement takes effect when you marry. A couple who is already married can sign a postnuptial agreement instead.
Most prenuptial agreements that fail do so on how they were made, not on what they say. A judge who finds pressure at signing, hidden assets, or terms that reach into child custody can set the whole agreement aside. These are the mistakes that come up most often:
No. Section 452.330 defines marital property as everything either spouse acquires after the marriage, then carves out exceptions. Property acquired by gift, bequest, devise or descent is one of them, so an inheritance you receive during the marriage is separate property. So is anything acquired in exchange for it, or for property you owned prior to the marriage.[4]
That protection is easy to lose in practice. Move an inheritance into a joint account, and tracing it years later becomes difficult. A prenup that names the inheritance and says it stays separate removes the argument before it starts.
No. Missouri is an equitable distribution state rather than a community property state. A judge divides the marital estate in the proportions the judge considers just, which is often not half and half. Separate property is not divided at all, and property excluded by a valid written agreement stays out of the marital estate.[4]
That last point is what a prenup buys you. Instead of leaving the split to a judge, you and your future spouse write the division down in advance. Couples already in a divorce settle the same questions in a Missouri marital settlement agreement instead.
Usually not. Marital property means property acquired after the marriage, so a house you bought and paid for before the wedding starts out as your separate property.[4] A court divides what the two of you built together. It does not divide what was already yours.
Two things put that house back in play. Adding your spouse to the deed can convert it. Marital income spent on the mortgage or on a renovation can also give the marital estate a claim on part of the value.
Naming the house in your prenup, and saying how any rise in its value is treated, settles both questions while you still agree.
It depends on who writes it. Family law firms in the state commonly quote $2,500 to $10,000 to draft a prenuptial agreement, and less if you only want an existing draft reviewed. Completing a template yourself costs nothing but your time, and recording the signed contract with the county recorder adds a filing fee.
A prenup that protects a family business is worth the legal fee. Cost tracks complexity, not wealth. A couple with one salary and one car needs far less attorney time than a couple bringing a business, a rental property and children from an earlier marriage.
Six steps take a prenup from idea to an enforceable agreement. List what each of you owns and owes, decide what stays separate, and put the terms in writing. Then sign and acknowledge the document, record it with the county recorder, and review it after a major change. An agreement signed the night before the ceremony is the one a judge looks at hardest.
Last Updated: September 2026 - This guide is reviewed and updated regularly to reflect current Missouri laws. If you notice an error or outdated information, please contact us.
Other Prenuptial Agreement Forms by State
Unless noted otherwise, the sources below are from the Mo. Rev. Stat..