What Is the Uniform Premarital Agreement Act?

The Uniform Premarital Agreement Act is a model law drafted in 1983 by the Uniform Law Commission that gives states a shared framework for prenuptial agreements: what a prenup can cover, how it must be signed, and when a court can refuse to enforce it.¹ Before the Act, a prenup signed in one state could be treated completely differently if the couple moved somewhere else. The Act, usually shortened to UPAA, replaced that patchwork with a consistent set of rules in the states that adopted it.

Where the Act Applies

As of early 2026, 28 states and the District of Columbia have adopted either the original 1983 UPAA or its 2012 successor, the Uniform Premarital and Marital Agreements Act (UPMAA).¹ That covers more than half the country, though individual legislatures sometimes tweak the language to fit their existing family law codes. The remaining states rely on their own common law or statutory rules, which can differ in meaningful ways, especially around what makes an agreement enforceable.

The practical benefit of broad adoption is portability. A prenup drafted under one UPAA state’s rules carries the same basic legal structure if the couple later moves to another UPAA state. Before signing or challenging an agreement, check which version your state enacted, because the 1983 and 2012 texts differ on several important points.

What Makes an Agreement Valid

The formal requirements are simple. The agreement must be in writing and signed by both people who plan to marry. No oral promise or informal understanding counts. The UPAA does not require witnesses or notarization as a baseline, though some adopting states add those on their own.

One detail that catches people off guard: the agreement has no legal effect until the marriage actually takes place. If the wedding is called off, the signed document is just paper. That is by design. The UPAA treats the marriage itself as the event that activates the contract, replacing the traditional requirement that each side exchange something of value for a binding deal.

What the Agreement Can Cover

The UPAA gives couples broad freedom to structure their financial relationship. Permitted topics include:

Property rights, including who owns assets acquired before or during the marriage.
Management and control of property during the marriage, including the right to sell, lease, or give away assets.
How property gets divided if the marriage ends through divorce or death, overriding the state’s default rules.
Modification or waiver of spousal support. This is one of the most commonly negotiated provisions and one of the most frequently challenged.
Who is entitled to death benefits from a life insurance policy.
A choice-of-law clause selecting which state’s law will govern interpretation of the agreement.

The Act also includes a catch-all for any other matter that does not violate public policy or criminal law. That open-ended language gives couples room for unusual provisions, like interests in a family business or intellectual property rights.

Sunset Clauses

Nothing in the UPAA prevents couples from including a sunset clause that causes the agreement to expire after a set period, such as ten or fifteen years of marriage. Some sunset clauses void the entire agreement; others expire only specific provisions. Courts generally enforce them when the triggering event or date is clearly defined. Vague language like “after several years” invites a challenge. If you want the agreement to expire, name a date or a specific milestone.

What the Agreement Cannot Cover

The UPAA draws a hard line around child support. No provision in a prenup can reduce or waive a child’s right to financial support from either parent. Courts treat this as public policy that private contracts cannot override. If a clause tries to limit child support, a court will strike it. The rest of the agreement can survive, but that term is dead on arrival.

The same public-policy limit extends to child custody and visitation. The UPAA does not address custody directly, but courts in virtually every state refuse to enforce pre-arranged custody terms because those decisions must be made based on the child’s circumstances at the time of the dispute, not years earlier.

So-called “lifestyle clauses,” which penalize infidelity, require a certain standard of housekeeping, or dictate personal behavior, occupy a gray area. The UPAA does not explicitly prohibit them. But courts in many states view them skeptically, particularly in no-fault divorce jurisdictions where marital misconduct is not supposed to drive financial outcomes. Expect such clauses to face a harder enforceability standard than straightforward financial provisions.

Federal Limits the Act Cannot Override

Two federal rules can override anything the UPAA or state law says.

The first involves retirement benefits. Federal law under the Employee Retirement Income Security Act (ERISA) requires that a “spouse” provide written consent to waive survivor benefits from a qualified retirement plan like a 401(k) or pension. A fiancé or fiancée is not a spouse. A waiver of ERISA-governed survivor benefits signed before the wedding is unenforceable as a matter of federal law, no matter what the prenup says. Treasury regulations make this explicit: a prenuptial agreement does not satisfy the spousal consent requirement, even if notarized and witnessed by a plan representative. The workaround is to include the waiver in the prenup, then sign a separate postnuptial confirmation after the marriage that names an alternate beneficiary, acknowledges the effect of giving up survivor benefits, and is witnessed by a notary or plan representative.² Skipping that post-marriage step is one of the most common and expensive drafting mistakes in prenuptial agreements.

The second involves taxes. Federal law treats transfers between spouses, and transfers to a former spouse incident to divorce, as nontaxable, meaning neither side recognizes a gain or loss and the receiving spouse takes the transferor’s original basis.³ Agreements calling for large asset transfers should be structured to happen after the marriage to take advantage of this rule. Spousal support has its own tax wrinkle: for any divorce or separation agreement executed after December 31, 2018, alimony payments are no longer deductible by the payer and no longer taxable to the recipient.⁴ That change, from the Tax Cuts and Jobs Act’s repeal of the former deduction, shifted the economics of alimony negotiations.⁵ Prenups drafted before 2019 that assumed the old treatment may need to be revisited.

How Courts Decide Whether to Enforce an Agreement

When someone challenges a prenup under the UPAA, they carry the burden of proof. The person trying to set the agreement aside must convince a court that it fails on at least one of two independent grounds.

Involuntary Signing

The first ground is that the agreement was not signed voluntarily. The UPAA does not define “voluntarily,” so courts look at the surrounding circumstances. Factors that tend to show coercion include presenting the agreement for the first time just days or hours before the wedding, refusing to go through with the ceremony unless the other person signs, and giving the other person no meaningful opportunity to consult an attorney. An agreement dropped on someone the night before a wedding, after guests have arrived and deposits are forfeited, presents a strong case for duress.⁶

The UPAA does not require that both parties have independent legal counsel. A prenup can be enforceable even if one party had no attorney at all. That said, the absence of independent counsel is one of the first things a court looks at when deciding whether someone signed freely.

Unconscionability Plus Inadequate Disclosure

The second ground has two elements that must both be present. The challenger must show that the agreement was unconscionable at the time it was signed, and that they were not given adequate financial information before signing. Unconscionability alone is not enough.

Specifically, the agreement can be thrown out if the challenger proves all three of the following: they did not receive a fair and reasonable disclosure of the other party’s property and financial obligations; they did not voluntarily waive the right to that disclosure in writing; and they did not otherwise have adequate knowledge of the other party’s finances. If any one of those three fails, the unconscionability defense collapses.

Under the original UPAA, unconscionability is measured at the time the agreement was signed, not at the time of divorce. An agreement that seemed reasonable when signed but looks brutally lopsided twenty years later can still be enforced if the signing process was clean.

What the 2012 UPMAA Changed

The Uniform Premarital and Marital Agreements Act, finalized in 2012, is not just a name change. It made several substantive departures from the 1983 UPAA that shift the balance toward the less-powerful party in the negotiation.

It covers agreements made after marriage. The original UPAA applied only to agreements signed before the wedding; the UPMAA extends the same framework to postnuptial agreements.
It requires access to independent counsel. If the party proposing the agreement has an attorney and the other party cannot afford one, the proposing party must pay reasonable attorney fees and costs for the other side.
It separates unconscionability from disclosure. Under the UPAA, the two are linked into a single defense; the UPMAA treats them as separate grounds, expanding the reasons a court can invalidate an agreement from two to five.
It allows review at the time of enforcement. A court can refuse to enforce a specific term if enforcing it would cause substantial hardship due to a material change in circumstances after signing. The original UPAA locked the analysis to the moment of execution.
It requires income disclosure. The UPAA’s disclosure requirement focuses on property and financial obligations; the UPMAA adds income to the list.

Only a handful of states have adopted the UPMAA so far. Most UPAA states still follow the 1983 version, so the distinction matters depending on where you live.

Changing or Canceling the Agreement After the Wedding

Once the marriage takes place, the couple can amend or cancel their prenuptial agreement at any time as long as they both agree. The amendment or revocation must be in writing and signed by both spouses. No exchange of money or property is required to make the change binding, which removes what would otherwise be a hurdle under general contract law. That matters because financial circumstances shift: one spouse might start a business, receive an inheritance, or leave the workforce to raise children. The UPAA lets couples update the deal through a straightforward written modification rather than live with terms that no longer reflect reality.

Practical Steps That Make an Agreement Harder to Challenge

The UPAA sets the minimum requirements for a valid agreement, but meeting the bare minimum invites a courtroom fight later. A few additional steps make a prenup far harder to attack:

Present the agreement months before the wedding, not weeks. The closer to the ceremony, the easier it is to argue duress.
Have both parties represented by their own attorney. Even though the UPAA does not mandate it, separate counsel effectively neutralizes a voluntariness challenge.
Attach a complete financial schedule listing assets, debts, and income. Detailed disclosure makes it harder for anyone to claim they did not know what they were agreeing to.
If the agreement waives ERISA-governed retirement benefits, sign a postnuptial confirmation after the wedding that meets federal requirements.²
Keep signed originals or certified copies in a secure location both parties can access.

1
Uniform Law Commission. Premarital and Marital Agreements Act
2
Office of the Law Revision Counsel. 29 USC 1055 – Requirement of Joint and Survivor Annuity and Preretirement Survivor Annuity
3
Office of the Law Revision Counsel. 26 USC 1041 – Transfers of Property Between Spouses or Incident to Divorce
4
IRS. Divorce or Separation May Have an Effect on Taxes
5
Office of the Law Revision Counsel. 26 USC 71 – Alimony and Separate Maintenance Payments (Repealed)
6
Uniform Law Commission. Premarital and Marital Agreements Act