The Uniform Premarital and Marital Agreements Act is a 2012 model law from the Uniform Law Commission that sets a single framework for how prenuptial and postnuptial contracts are formed, enforced, and challenged. It replaced the 1983 Uniform Premarital Agreement Act, which only covered agreements signed before a wedding. The newer act pulls both pre- and post-marriage contracts under the same rules and spells out four conditions, each independently required, before a court will enforce one. Only Colorado and North Dakota have fully adopted it, though roughly 29 states and the District of Columbia follow some version of either the old or new uniform act.
What the Act Covers
The act applies to two kinds of contracts between spouses or future spouses. A premarital agreement is signed by people planning to marry and takes effect once the marriage is legally recognized. A marital agreement is signed by people already married who intend to stay married. Amendments to either type are treated as new agreements and must satisfy the same formalities.1NAEPC Journal of Estate and Tax Planning. Uniform Premarital and Marital Agreements Act – Definitions
What a couple can address inside one of these agreements is broad: spousal support, property rights during the marriage and at divorce or death, responsibility for debts, and allocation of legal fees. The point is to opt out of the default rules the state would otherwise impose on property division and support.
Separation agreements are not covered by the act, and neither are agreements that need court approval to take effect. If you’re working on either of those, the UPMAA rules don’t apply.
The Four Enforceability Requirements
If someone later challenges the agreement, the challenger must prove that at least one of four requirements was missing when it was signed. Any single failure is enough to make the agreement unenforceable.2NAEPC Journal of Estate and Tax Planning. The New Uniform Premarital and Marital Agreement Act This is a change from the 1983 act, which bundled unconscionability and inadequate disclosure together and required proof of both.
Voluntary Consent
Consent must be voluntary and free from duress. The act does not define either term, leaving courts to apply state-law standards. In practice, duress claims typically involve last-minute pressure, like presenting the document days before the wedding with a threat to call it off, or exploiting a significant power imbalance. Feeling pressured by the situation itself is usually not enough. Courts look for conduct by the other party that overcame the signer’s free will.
Access to Independent Legal Representation
Each party must have had access to independent legal representation before signing. Access, not actual hiring. The person had to have a reasonable opportunity to find a lawyer, get advice, and consider it before signing.
There’s one important wrinkle. If one party has a lawyer and the other does not, the unrepresented party must have either had the financial ability to hire counsel or the represented party must have offered to pay for one. Handing your fiancé a prenup the night before the wedding, when they have no time or money to consult anyone, is the scenario this rule targets.
Plain-Language Explanation for the Unrepresented
If a party chose not to hire a lawyer despite having access, the agreement itself must contain either a notice of the rights being waived or a plain-language explanation of the marital rights and obligations being modified. This is the fallback protection. Even without counsel in the room, the person signing has to be able to read what they’re giving up.
Adequate Financial Disclosure
Each party must receive a reasonably accurate description and good-faith estimate of the other party’s property, debts, and income. The standard is “reasonably accurate” and “good faith,” not perfect. Undervaluing a business by 5% in a good-faith estimate probably satisfies the requirement. Hiding an entire brokerage account does not.
A party can waive the right to receive disclosure, but the waiver has to appear in a separate signed record. You cannot bury a disclosure waiver inside the body of the agreement itself. Alternatively, disclosure is considered satisfied if the party already had adequate knowledge of the other’s finances or a reasonable basis for that knowledge, which often applies when both spouses have been actively managing family finances together for years.
Formal Requirements for Creating the Agreement
The formalities are simple, but missing any of them opens the door to a later challenge. The agreement must be in a “record,” defined broadly enough to cover both paper and electronic files, and both parties must sign it.3NAEPC Journal of Estate and Tax Planning. Uniform Premarital and Marital Agreements Act – Formation Requirements
Notarization and witnesses are not required by the act itself. Notarized signatures do make it harder for someone to deny signing later, and some states that adopt their own versions of the act add witness or notarization requirements on top of the baseline, so local rules matter.
No additional consideration is needed. For premarital agreements, the marriage itself is the consideration. For marital agreements, this is a meaningful change: under the old common-law approach in most states, a postnup needed some new exchange of value beyond the marriage to be enforceable. The UPMAA dropped that requirement.
Terms the Act Will Not Enforce
Even a properly executed agreement cannot do certain things. Courts will refuse to enforce any provision that:
- Harms a child’s right to support. Parents cannot contract away a child’s entitlement to financial support.
- Dictates child custody. Custody is always decided on the child’s best interests at the time, not a prior contract.
- Limits a domestic violence victim’s access to protective orders or other legal remedies. This category was added by the UPMAA.
- Modifies the legal grounds for divorce or separation.
- Financially penalizes a spouse for filing for divorce.2NAEPC Journal of Estate and Tax Planning. The New Uniform Premarital and Marital Agreement Act
The public assistance safety net also overrides private agreements. If enforcing a spousal support waiver would leave one spouse eligible for government assistance, a court can override the waiver and order support to the extent necessary to prevent that outcome. The court’s authority is narrow: it can fill the gap between destitution and self-sufficiency, not rewrite the whole arrangement.
Unconscionability as a Separate Check
Beyond the four requirements, courts keep the discretion to refuse enforcement of any individual term they find unconscionable at the time it was signed. This is a separate analysis. A court evaluating unconscionability asks whether the term was so one-sided that no reasonable person would have agreed to it and no honest person would have proposed it.2NAEPC Journal of Estate and Tax Planning. The New Uniform Premarital and Marital Agreement Act
The default moment for the test is when the agreement was signed. The UPMAA also includes an alternate provision that a state can adopt instead, letting courts test unconscionability at the time of divorce and refuse enforcement where a material change in circumstances since signing would cause substantial hardship. The difference matters: an agreement that looked fair when both spouses earned similar incomes can look very different fifteen years later if one spouse left the workforce to raise children.
Choice of Law When Couples Move
Couples who sign in one state and later move face a real question about whose law controls. The act addresses this directly. If the agreement designates a specific jurisdiction’s law, that designation controls, as long as either the agreement or one of the parties has a significant relationship to that jurisdiction. You cannot pick a random state with favorable rules if neither spouse has ever lived there.2NAEPC Journal of Estate and Tax Planning. The New Uniform Premarital and Marital Agreement Act
A valid choice-of-law clause still has limits. A court can disregard the chosen state’s law for a particular provision if applying it would violate a fundamental public policy of the state where the dispute is being decided. With no choice-of-law provision at all, the forum state’s law applies by default. Couples who own property in multiple states or expect to relocate benefit most from putting a thoughtful choice-of-law clause in writing.
Amending or Revoking the Agreement
Any modification or revocation counts as an “amendment,” and amendments must meet the same formalities as the original: a written record signed by both parties. An oral agreement to tear up a prenup is not enforceable, no matter how sincere the conversation.1NAEPC Journal of Estate and Tax Planning. Uniform Premarital and Marital Agreements Act – Definitions
No additional consideration is required to amend or revoke. One spouse doesn’t need to offer anything new in exchange for the other’s agreement to change the terms. The timing of the amendment determines its classification. An amendment signed before the wedding to a premarital agreement remains a premarital agreement; one signed after the wedding becomes a marital agreement and is judged by those standards. State equitable doctrines may enforce or modify agreements without a writing in exceptional circumstances, but relying on that is a gamble.
Where the Act Is Actually in Force
Adoption has been limited. Colorado and North Dakota are the only states to have enacted the UPMAA, with Colorado’s version taking effect in July 2014. About 29 states and the District of Columbia follow some version of either the 1983 UPAA or the UPMAA, which means the older act is still the governing framework in most of those jurisdictions. The remaining states follow their own common-law or statutory rules, which can differ substantially from either uniform act. Before relying on any premarital or marital agreement, it’s worth consulting a family law attorney in your current state and in any state you might move to.