Utah Prenuptial Agreement Laws: Requirements and Enforceability (2026)

Utah enforces prenuptial agreements under its version of the Uniform Premarital Agreement Act, Utah Code 81-3-201 to 81-3-208. A prenup must be in writing and signed by both parties (81-3-202). Under 81-3-205, a court will not enforce it if the challenging spouse proves the agreement was signed involuntarily, or was fraudulent and that spouse lacked fair disclosure of the other's finances.

Information last verified on 2026-10-09. This article has not been reviewed by a licensed lawyer.

Jurisdiction scope: This article covers premarital agreements under Utah Code Title 81, Chapter 3, Part 2 (81-3-201 to 81-3-208), with a note on property division under 81-4-406. It does not cover Utah case law interpreting the act, postnuptial agreements beyond amendments to a prenup, tax or estate planning, or other states' law. This page is information only; it is not a template or a drafting guide.

Which law governs prenups in Utah?

Utah's premarital agreement statute is a uniform act. Section 81-3-208 provides: "This part shall be applied and construed to effectuate the part's general purpose to make uniform the law with respect to the subject of this part among states enacting this uniform law."

The act's eight sections cover definitions, formalities, content, the effect of marriage and amendment, enforcement, void marriages, limitation of actions and construction. They were formerly in Title 30, Chapter 8 and were renumbered into Title 81 effective September 1, 2024. Older references to Title 30, Chapter 8 point to the same act under its earlier numbering.

Requirements for a valid prenup in Utah

Section 81-3-202 sets two rules: "(1) A premarital agreement shall be in writing and signed by both parties. (2) A premarital agreement is enforceable without consideration." Under 81-3-204(1), the agreement becomes effective upon marriage.

None of the eight sections of Part 2 requires notarization, witnesses, independent lawyers for each spouse, or a waiting period between signing and the wedding. A lawyer licensed in Utah can draft or review an agreement, but the act does not make that a condition of enforcement.

When a Utah prenup is unenforceable

The burden is on the spouse who wants to avoid the agreement. Under 81-3-205(1), "A premarital agreement is not enforceable if the party against whom enforcement is sought proves that:"

1. "that party did not execute the agreement voluntarily"; or
2. "the agreement was fraudulent when the agreement was executed and, before execution of the agreement, that party:
   • (i) was not provided a reasonable disclosure of the property or financial obligations of the other party insofar as was possible;
   • (ii) did not voluntarily and expressly waive, in writing, any right to disclosure ...; and
   • (iii) did not have, or reasonably could not have had, an adequate knowledge of the property or financial obligations of the other party."

The second route is conjunctive: the agreement must have been fraudulent when signed, and all three disclosure conditions must be met. A spouse who received reasonable disclosure, waived it in writing, or already had adequate knowledge cannot use that route. Under 81-3-205(3), whether the agreement was fraudulent is decided by the court as a matter of law.

No unconscionability ground in the statute. Section 81-3-205 does not list unconscionability as a ground for refusing enforcement. Its two grounds are involuntary execution and fraud combined with the disclosure conditions. This page does not cover how Utah courts have applied the act.

Spousal support waivers

The act contemplates prenup terms that modify or eliminate spousal support, and 81-3-205(2) limits their effect:

"If a provision of a premarital agreement modifies or eliminates spousal support and that modification or elimination causes one party to the agreement to be eligible for support under a program of public assistance at the time of separation or marital dissolution, a court, notwithstanding the terms of the agreement, may require the other party to provide support to the extent necessary to avoid that eligibility."

For how Utah courts set alimony without an agreement, see Utah alimony laws.

What a Utah prenup cannot do

A prenup cannot reduce a child's rights to support. Section 81-3-203(2) provides: "The right of a child, as defined in Section 81-6-101, to support, health and medical provider expenses, medical insurance, and child care coverage may not be affected by a premarital agreement."

Section 81-3-203 does not mention child custody. This page does not cover how Utah courts treat custody terms in a prenup.

Changing or revoking a prenup after the wedding

Under 81-3-204(2), "(a) After marriage, a premarital agreement may be amended or revoked only by a written agreement signed by the parties. (b) The amended agreement or the revocation is enforceable without consideration."

That rule covers changes to an existing prenup. This page does not cover other agreements spouses sign after marriage (postnuptial agreements) that do not amend a premarital agreement.

Time limits and void marriages

Time limits. Under 81-3-207, "Any statute of limitations applicable to an action asserting a claim for relief under a premarital agreement is tolled during the marriage of the parties to the agreement." The clock does not run while the spouses are married.

If the marriage is void. Under 81-3-206, "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."

How Utah divides property without a prenup

Utah is an equitable-distribution state, not a community-property state. Under 81-4-406(4), the court may include in the divorce decree "any equitable orders relating to ... any property, debts, or obligations." The Utah State Courts explain: "Utah law requires an equitable division of marital property. Equitable means fair, which is not necessarily equal." See Utah divorce laws.

Disclaimer: This article provides general legal information about premarital agreements under Utah Code 81-3-201 to 81-3-208, verified on 2026-10-09. It is not legal advice and is not a template. For advice about a specific agreement, consult a lawyer licensed in Utah.

Related

• Prenuptial agreement laws in every state
• Utah divorce laws
• Utah alimony laws
• Utah child support laws

Last updated: 2026-10-09.

Frequently Asked Questions

Are prenups enforceable in Utah?

Yes, if they meet the Uniform Premarital Agreement Act in Utah Code 81-3-201 to 81-3-208. A court will not enforce one if the challenging spouse proves involuntary signing, or fraud combined with the disclosure failures listed in 81-3-205(1).

Does a prenup have to be notarized in Utah?

No section of Utah Code 81-3-201 to 81-3-208 requires notarization. Section 81-3-202 requires a writing signed by both parties.

Does each spouse need a lawyer for a Utah prenup?

The act does not require independent counsel. Enforceability turns on voluntariness and, for fraud claims, disclosure (81-3-205(1)).

Can a Utah prenup waive alimony?

It can modify or eliminate spousal support, but if that would make a spouse eligible for public assistance at separation or divorce, the court may order enough support to avoid that eligibility (81-3-205(2)).

Can a prenup limit child support in Utah?

No. Under 81-3-203(2), a premarital agreement may not affect a child's right to support, health and medical provider expenses, medical insurance or child care coverage.

Can you change a prenup after marriage in Utah?

Yes, but only by a written agreement signed by both spouses; the amendment or revocation is enforceable without consideration (81-3-204(2)).