US-CaliforniaCan a prenuptial agreement be set aside in California?
Yes, a prenuptial agreement can be set aside in California if it was not voluntary, lacked full financial disclosure, or was unconscionable at signing — and the challenging party proves it by clear and convincing evidence.
What the Law Says
California law sets strict requirements for enforceable prenuptial agreements. If any key requirement is missing — especially voluntariness, disclosure, or fairness — a court may set the agreement aside.
Under the California Uniform Premarital Agreement Act (CUPAA), a prenuptial agreement is unenforceable if the party against whom enforcement is sought proves, by clear and convincing evidence, that they did not execute the agreement voluntarily, or that the agreement was unconscionable when executed and they did not have independent legal counsel and did not waive counsel in writing after being advised to obtain it.
The law also requires that each party must have had at least seven calendar days between receiving the final agreement and signing it — no exceptions. Additionally, both parties must provide full and fair disclosure of assets and debts before signing; failure to do so invalidates the agreement unless the right to disclosure was waived in writing with independent counsel.
Importantly, even if disclosure was waived, the agreement remains unenforceable if it was unconscionable at the time of execution and the party lacked counsel.
Statutory TextNot executed voluntarily
— Fam. Code § 1615(c)(1) — Grounds for nonenforcement
Statutory TextA party was not provided a fair, reasonable, and full disclosure of the property or financial obligations of the other party
— Fam. Code § 1615(c)(2) — Grounds for nonenforcement
Statutory TextA party did not voluntarily and expressly waive, in writing, any right to disclosure
— Fam. Code § 1615(c)(3) — Grounds for nonenforcement
Statutory TextThe agreement was unconscionable when it was executed
— Fam. Code § 1615(c)(4) — Grounds for nonenforcement
Statutory TextThe party against whom enforcement is sought was not represented by independent legal counsel
— Fam. Code § 1615(c)(4)(B) — Unconscionability exception
What Courts Have Said
California courts have interpreted the statutory standards strictly — especially regarding disclosure, timing, and unconscionability.
The court held that a prenup signed just before the wedding, without independent counsel and with inadequate disclosure, was unenforceable — emphasizing that voluntariness requires meaningful time and advice.
Established that premarital agreements must be fair and reasonable at execution, and that courts will scrutinize whether one party was unfairly pressured or lacked knowledge of the other’s finances.
What to Do
Ensure both parties receive the final prenup at least 7 days before signing.
Provide complete, written disclosure of all assets, debts, income, and obligations — or obtain a valid written waiver *with* independent counsel.
Each party should retain their own attorney; if one waives counsel, the waiver must be in writing and made after being advised to seek counsel.
Avoid last-minute signings, threats, or pressure — courts examine context for voluntariness.
If challenging a prenup, file a motion early in dissolution proceedings and gather evidence of coercion, concealment, or unfairness.
Sources
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European UnionNot legal advice. This article is general information based on publicly available sources, written for educational purposes. Laws change and individual situations vary. Consult a licensed attorney in your jurisdiction before acting on anything you read here. Last reviewed: 2026-06-08.