Can a Prenuptial Agreement Be Challenged?

Yes, a prenuptial agreement can be challenged — and courts do invalidate them when specific legal grounds are present. However, a properly drafted and executed prenup is one of the most durable legal documents in family law. Understanding when prenups fail helps explain what makes them enforceable.

Grounds for Challenging a Prenup

Lack of voluntariness — a prenup signed under duress, coercion, or undue pressure may be invalidated. Presenting the agreement the night before the wedding and insisting it be signed without time for review is a classic scenario courts scrutinize. Both parties must sign voluntarily with adequate time to consider the agreement.

Lack of full financial disclosure — prenups require each party to fully disclose their financial situation — assets, debts, income, and liabilities. A prenup can be challenged if one party concealed significant assets or understated net worth. Courts treat material non-disclosure as fatal to enforceability.

Unconscionability — a prenup that is grossly one-sided — leaving one spouse with essentially nothing while the other retains everything — may be challenged as unconscionable. Courts are more likely to enforce agreements where both parties receive some reasonable benefit.

Lack of independent legal counsel — while not universally required, a prenup signed by a party who did not have the opportunity to consult an independent attorney is more vulnerable to challenge. Many family law attorneys require the opposing party to acknowledge in writing that they had the opportunity to consult separate counsel.

Procedural defects — prenups must meet each state's formal requirements — generally in writing, signed by both parties, and sometimes notarized or witnessed. Failure to meet formal requirements can void the agreement entirely.

Fraud or misrepresentation — if one party made material misrepresentations about their finances, circumstances, or the terms of the agreement, the prenup can be invalidated on fraud grounds.

What Prenups Generally Cannot Do

Prenups can address property division and alimony. They generally cannot waive child support or determine child custody in advance — these are determined based on the best interests of the child at the time of divorce, not predetermined by contract.