A Kansas prenuptial agreement is a written contract signed before the wedding that sets out the property and financial rights each spouse will have once the marriage begins.[1.1] Article 24 of Chapter 23 of the Kansas Statutes governs it. The contract has to be in writing and signed by both prospective spouses.[2] It takes effect on the day the couple marries.[4]
A prenup can settle who owns what, how each asset is managed during the marriage, and where property goes on separation, divorce, or death.[3.3] It cannot adversely affect a child's right to support.[3.9] No term may violate public policy or a statute imposing a criminal penalty.[3.8]
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A Kansas prenuptial agreement is a contract between two people who plan to marry. It is signed before the wedding and fixes the property and financial terms of the marriage in advance.[1.1] The document carries no legal force until the couple actually marries.[4] Article 24 of Chapter 23 governs these agreements, and it opens by defining the document itself.[1.1]
"Premarital agreement" means an agreement between prospective spouses made in contemplation of marriage and to be effective upon marriage.
The same section defines property broadly. It means an interest, present or future, legal or equitable, vested or contingent, in real or personal property, including income and earnings.[1.2] That reaches a paycheck as surely as it reaches a house.
If you are already married, this is not the document you need. An agreement signed after the wedding is a postnuptial agreement, which is a separate contract with its own rules.
Article 24 of Chapter 23 of the Kansas Statutes holds every rule that governs premarital agreements in this state. It sets out what the document must look like to be valid and when it starts to bind the spouses. It also lists what a prenup can decide and the narrow grounds for refusing to enforce one.
Section 23-2403 of the Kan. Stat. Ann. sets the form rules for the document.
Notarization is not on that list, and neither is a witness. Many Kansas couples still sign in front of a notary, because a notarized signature is harder to dispute years later.
A premarital agreement becomes effective upon marriage.[4] Sign it a year before the wedding and it still sits idle until the ceremony. If the wedding never happens, the prenup never starts.
A void marriage is handled differently. If a marriage is determined to be void, an agreement that would otherwise have been a premarital agreement is enforceable only to the extent necessary to avoid an inequitable result.[7]
After marriage, a premarital agreement may be amended or revoked only by a written agreement signed by the parties.[5] A conversation does not do it, and neither does one spouse acting alone.
The amended agreement or the revocation is enforceable without consideration.[5] Neither spouse has to give up anything new to make the change stick.
Section 23-2404 of the Kan. Stat. Ann. lists what a premarital agreement may decide, and the list is wide. It reaches every kind of property either partner owns or later acquires, how that property is handled during the marriage, and where it goes on separation, marital dissolution, or death.[3.3] Two limits sit outside the couple's control.
A Kansas prenup can settle any of the following.
In practice that reaches a home one partner owned before the wedding and a mortgage the couple will carry together.[3.1] It also reaches a business one partner already runs, retirement savings, and an inheritance either of them expects.[3.1]
Naming those assets in the agreement is what protects them if the marriage ends, and it sets out how each one is divided.[3.3][3.1] If a term asks one of you to make a will, you will need a Kansas last will to carry it out.[3.5]
Two subjects stay off the table. The right of a child to support may not be adversely affected by a premarital agreement.[3.9] And no term may violate public policy or a statute imposing a criminal penalty.[3.8]
Child custody and parenting time sit outside the agreement as well. A Kansas court decides those questions on the child's best interest, whatever the couple wrote before the wedding.
Yes. Kansas enforces premarital agreements, and the requirements are short. Put the terms in writing, have both spouses sign, and the contract takes effect on the day you marry.[2] It is enforceable without consideration.[2] A court sets an agreement aside only on the narrow grounds in Section 23-2407 of the Kan. Stat. Ann.
Unconscionability is not a jury question. An issue of unconscionability of a premarital agreement is decided by the court as a matter of law.[6.6]
Timing runs differently from an ordinary contract. Any statute of limitations on a claim for relief under a premarital agreement is tolled during the marriage of the parties.[8] Equitable defenses limiting the time for enforcement, including laches and estoppel, are still available to either party.[8]
A prenup fails only on the grounds in Section 23-2407 of the Kan. Stat. Ann., and the spouse resisting it carries the burden of proof. There are two routes. One is that the spouse did not execute the agreement voluntarily.[6.1] The other is that the agreement was unconscionable when it was executed.[6.2]
The unconscionability route is narrower than it looks. All three of the conditions below must also have applied to that spouse before signing.
Get the financial disclosure right. A spouse who was never given a fair and reasonable picture of the other's assets and debts can attack the prenup in court years later.[6.2] The same is true if they could not reasonably have known it.[6.4]
Spousal support carries one more rule. A prenup may modify or eliminate it.[3.4] But if that change leaves one party eligible for support under a program of public assistance at separation or marital dissolution, a court may require the other party to provide support.[6.5] The support runs only as far as it takes to avoid that eligibility.[6.5]
Building a Kansas prenup takes four steps. List what each of you owns and owes, agree on how those assets will be treated, put the terms in writing, and both sign before the wedding. Section 23-2403 of the Kan. Stat. Ann. sets the form requirements and Section 23-2404 sets the range of subjects you can settle.
Our prenup template builder fills the Kansas form for you, and the download links at the top of this page give you the blank document. If your finances are complicated, a Kansas family law attorney can review the terms before either of you signs.
Last Updated: September 2026. This guide is reviewed and updated regularly to reflect current Kansas law. If you notice an error or outdated information, please contact us.
Unless noted otherwise, the sources below are from the Kan. Stat. Ann..