An Idaho prenuptial agreement is a written contract that two people sign before their wedding. It sets out how their property, debts, and spousal support will be handled if the marriage ends in divorce or death. Idaho law calls it a premarital agreement and defines it as an agreement between prospective spouses made in contemplation of marriage and effective upon marriage.[1.1]
The agreement can settle almost any financial matter between the two of you. It cannot reduce a child's right to support.[3.9] It also cannot require anything that violates public policy or a statute carrying a criminal penalty.[3.8] You can fill in the prenup agreement template above and adapt it to your own situation.
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Last Updated: September 2026. This guide is reviewed and updated regularly to reflect current Idaho law. If you notice an error or outdated information, please contact us.
An Idaho prenuptial agreement is a contract between two people who plan to marry. It must be in writing and signed by both of them.[2] Section 32-921 of the Idaho Code defines a premarital agreement as one made in contemplation of marriage and effective upon marriage.[1.1] The contract takes effect on the wedding day and not before.[4]
The statute reads property broadly. It covers any interest, present or future, legal or equitable, vested or contingent, in real or personal property, including income and earnings.[1.2] So an Idaho prenup can reach a paycheck, a rental unit, a retirement account, or a share in a business.
One rule sets this contract apart from an ordinary one. It is enforceable without consideration, so neither person has to give up something of value to make it binding.[2]
Idaho's prenup rules sit in Chapter 9 of Title 32 of the Idaho Code. The statute may be cited as the Uniform Premarital Agreement Act.[8] It covers how to sign the agreement, what it may settle, when it takes effect, and the grounds a court can use to refuse to enforce it.
Idaho asks for three things. The agreement must be in writing and signed by both parties.[2] It must also be executed and acknowledged or proved in the manner set by Sections 32-917 through 32-919 of the Idaho Code.[2]
Acknowledgment is not optional. Section 32-922 of the Idaho Code sends execution to Sections 32-917 through 32-919. Section 32-917 requires contracts for marriage settlements to be executed and acknowledged or proved in like manner as conveyances of land.[9] In practice that means signing in front of a notary.
All contracts for marriage settlements must be in writing, and executed and acknowledged or proved in like manner as conveyances of land are required to be executed and acknowledged or proved.
After the wedding, the agreement can be amended or revoked only by a written agreement that both parties sign, and that change needs no consideration.[4]
A properly signed Idaho prenup is enforceable on its own terms. Two situations change that. If the marriage turns out to be void, the agreement is enforceable only so far as needed to avoid an inequitable result.[6] A claim under the agreement is also not lost to the clock during the marriage, because the statute of limitations is tolled while the parties are married.[7]
Tolling is not unlimited. Equitable defenses that limit the time for enforcement, including laches and estoppel, stay available to either party.[7]
An Idaho judge refuses to enforce a premarital agreement only on the grounds Section 32-925 sets out, and the spouse resisting it has to prove one of them. Whether an agreement is unconscionable is decided by the court as a matter of law.[5.6]
Custody and visitation are a separate matter. A prenup cannot adversely affect a child's right to support, and a judge decides support and parenting on the child's own circumstances.[3.9]
Idaho is a community property state, and that is the backdrop your prenup writes over. Property owned before the marriage, plus anything received afterwards by gift, bequest, devise, or descent, stays separate property.[10] Most other property acquired during the marriage is community property, and so is the income from separate and community property alike.[11]
A prenup lets you redraw that line. Section 32-923 lets you set each party's rights in any property of either or both of you.[3.1] So an agreement can keep a salary, a business, or a rental separate that Idaho would otherwise treat as community.
Yes. Premarital agreements are legal in Idaho, which has adopted the Uniform Premarital Agreement Act in Chapter 9 of Title 32 of the Idaho Code.[8] An agreement in writing, signed by both parties, and acknowledged under Sections 32-917 through 32-919 is enforceable, and it needs no consideration.[2] A court sets one aside only on the narrow grounds in Section 32-925.[5.1]
Idaho does not publish an official prenup form, so the two of you decide what goes in. Section 32-923 of the Idaho Code lists eight matters you are allowed to settle in advance, and they run from everyday property management to the law that governs the contract.
Two limits apply in Idaho. A premarital agreement cannot adversely affect a child's right to support.[3.9] The catch-all clause that lets you settle any other matter stops at anything violating public policy or a statute that imposes a criminal penalty.[3.8]
A waiver of spousal support is allowed, with one exception. The exception is public assistance. If the waiver leaves a spouse eligible for public assistance at separation or marital dissolution, a court can step in. Notwithstanding the terms of the agreement, it may require the other party to provide support to the extent necessary to avoid that eligibility.[5.5]
Not quite. Idaho divides community property in the proportions the court finds just. Section 32-712 of the Idaho Code adds that unless there are compelling reasons otherwise, the division should be substantially equal in value after debts.[12] Separate property is not part of that split.[10]
So the even split covers community property, not everything each spouse owns.
The same section tells the court to weigh other factors, and one of them is any antenuptial agreement between the parties. The court has no authority to amend or rescind that agreement.[12] A valid Idaho prenup therefore answers the question before the court reaches its own division.
Yes. Section 32-922 of the Idaho Code sets out the full formal requirement. The agreement must be in writing, signed by both parties, and executed and acknowledged or proved under Sections 32-917 through 32-919.[2] Nothing in that section requires either of you to hire an attorney.
What the statute does police is the process, and that is where self-drafted agreements fail. An agreement can be set aside if one party did not sign it voluntarily.[5.1] It can also fall if it was unconscionable when signed and that party never got a fair and reasonable disclosure of the other party's property and debts.[5.2]
So exchange full financial statements, give each other time to read the draft, and sign in front of a notary.[9] If one of you has a business, a pension, or property in another state, an attorney is worth the legal fee.
No, not as a premarital agreement. Section 32-921 of the Idaho Code defines a premarital agreement as one between prospective spouses, made in contemplation of marriage and effective upon marriage.[1.1] It has to be signed before the wedding. An agreement you already signed can still be amended or revoked afterwards, but only by a written agreement that both parties sign.[4]
Unless noted otherwise, the sources below are from the Idaho Code.