Everything engaged couples need to know about making a prenuptial agreement valid and enforceable in Missouri — in plain English, reviewed by attorney James Sexton, Esq.
Yes — prenuptial agreements are legal and enforceable in Missouri, governed by court-made case law rather than a statute.
Missouri is one of the minority of states that never adopted the Uniform Premarital Agreement Act. Instead, Missouri prenups are governed by common law, with the controlling standard set out in Ferry v. Ferry, 586 S.W.2d 782 (Mo. App. 1979): a premarital agreement is enforceable only if it was entered into freely, fairly, knowingly, understandingly, and in good faith with full disclosure. Later decisions such as McGilley v. McGilley (Mo. App. 1997) apply the same test and add a conscionability check, so a Missouri prenup must be both fairly made and fair in substance when signed.
A Missouri prenup is enforceable when it satisfies the Ferry v. Ferry test — signed freely and knowingly, with full financial disclosure, and conscionable in its terms.
The agreement should be a written document signed by both parties before the marriage. Oral premarital agreements will not hold up in a Missouri court.
Under Ferry v. Ferry, both parties must sign without pressure and with a real understanding of what they are giving up. Courts look at each person's age, education, sophistication, and bargaining position.
Each party must fully disclose their assets, debts, and income before signing. Because disclosure is baked into Missouri's core test, hiding or lowballing assets is the fastest way to lose the entire agreement.
Missouri courts weigh whether each party had access to their own attorney and enough time to review the agreement. A grossly one-sided deal signed days before the wedding is exactly what gets thrown out.
| Governing statute | Common law — Ferry v. Ferry, 586 S.W.2d 782 (Mo. App. 1979) (no UPAA) |
|---|---|
| Property division | Equitable distribution |
| Notarization | Required — marriage contracts must be acknowledged or proved like conveyances of land (Mo. Rev. Stat. § 451.220); online notarization is included for Missouri couples |
| Waiting period | None required — but sign well before the wedding |
| Spousal support | Maintenance can be limited or waived if the agreement is conscionable |
See how Missouri's signing formalities compare in our prenup notarization requirements by state guide.
Missouri courts set prenups aside when the Ferry v. Ferry test fails — the agreement wasn't entered freely and knowingly, financial disclosure fell short, or the terms were unconscionable.
Because Missouri's standard is court-made, judges have real latitude to examine how the agreement came together: who had a lawyer, how much time each party had to review it, the parties' relative bargaining power, and whether every asset and debt was on the table. An agreement pushed on a fiancé shortly before the wedding, or one built on incomplete disclosure, is vulnerable. A fully disclosed, unrushed, two-sided agreement is what Missouri courts routinely enforce.
Trusted Prenup creates a state-specific Missouri prenuptial agreement online — built to meet the requirements above and designed by James Sexton, Esq. A traditional attorney typically costs $2,500–$10,000; this is a flat $599.
A guided questionnaire captures your assets, debts, and wishes — most couples finish in under 90 minutes.
We assemble a complete prenup built to meet your state's exact legal requirements.
Review with your partner, then sign online with notarization handled for you.
A Missouri attorney-drafted prenup commonly costs $2,000-$7,500 or more. Trusted Prenup creates a state-specific Missouri prenup online for a flat $599, with online notarization included and an optional attorney-review add-on.
Yes — Missouri marriage contracts must be acknowledged or proved in the manner required for conveyances of land (Mo. Rev. Stat. § 451.220). That is why online notarization is included, not optional, for every Missouri couple at checkout.
Yes. Under Ferry v. Ferry, a Missouri prenup can be set aside if it wasn't entered freely, fairly, knowingly, and in good faith with full disclosure, or if its terms are unconscionable. Full disclosure and unhurried signing are the best protection.
No. Missouri never adopted the Uniform Premarital Agreement Act, so prenups are governed by common law — chiefly Ferry v. Ferry, 586 S.W.2d 782 (Mo. App. 1979) — rather than a statute.
Yes, Missouri courts will enforce a maintenance waiver if the agreement satisfies the Ferry test and isn't unconscionable. A waiver that would leave one spouse destitute is at real risk of being set aside.
It isn't legally required, but access to independent counsel is one of the factors Missouri judges weigh when deciding whether an agreement was fairly made. Trusted Prenup offers an optional attorney-review add-on to cover this.
Yes — Missouri enforces properly executed prenuptial agreements regardless of how they were drafted. What matters is execution: a written agreement, voluntary signatures, full financial disclosure, and Missouri's signing formalities. The full picture is in are online prenups legally binding.
Trusted Prenup is not a law firm and does not provide legal advice. This guide is general information about Missouri law and not a substitute for advice from a licensed attorney about your situation.