Everything engaged couples need to know about making a prenuptial agreement valid and enforceable in California — written in plain English, reviewed by attorney James Sexton, Esq.
Yes — prenuptial agreements are legal and fully enforceable in California.
California adopted the Uniform Premarital Agreement Act (UPAA), codified at California Family Code §§ 1600–1617. A premarital agreement must be in writing and signed by both parties to be valid — oral prenups are not enforceable. Once properly executed, a California prenup is treated like any other binding contract, provided it was entered voluntarily, with full financial disclosure, and is not unconscionable.
A California prenup is enforceable when it is voluntary, fully disclosed, and signed without time pressure — and the 7-day rule is the requirement people most often miss.
The agreement must be a written document signed by both spouses-to-be. California does not recognize oral premarital agreements.
Since January 1, 2020, each party must receive the final agreement at least seven calendar days before signing it — whether or not they have a lawyer. This waiting period gives both people time to read it, get advice, and sign without feeling rushed. Nonsubstantive amendments that don't change the terms don't restart the clock.
Both parties must give a fair and reasonable disclosure of every asset and debt. Failing to disclose can invalidate the entire agreement.
Both parties must sign voluntarily, free of duress. To waive spousal support, the waiving party must have been represented by independent legal counsel.
| Governing statute | Uniform Premarital Agreement Act — Cal. Fam. Code §§ 1600–1617 |
|---|---|
| Property division | Community property |
| Notarization | Strongly recommended (not required by Fam. Code § 1611) |
| Waiting period | 7 days between receiving the final draft and signing |
| Spousal support | Can be waived only with independent legal counsel |
See how California's signing formalities compare in our prenup notarization requirements by state guide. California is also one of the nine community-property states — community property vs. equitable distribution explains what that default means for your agreement.
California courts throw out prenups for three main reasons: the agreement wasn't signed voluntarily, a party didn't get full financial disclosure, or the terms were unconscionable when signed.
If the 7-day waiting period was skipped, or one spouse was pressured to sign right before the wedding, a court can find the agreement was not voluntary. Likewise, a spousal-support waiver signed without independent counsel — or a deal that leaves one spouse destitute — is vulnerable. A properly drafted, fully disclosed, unrushed prenup is exactly what holds up.
Trusted Prenup creates a state-specific California prenuptial agreement online — built to meet the requirements above and designed by James Sexton, Esq. A traditional attorney typically costs $2,500–$10,000; this is a flat $599.
A guided questionnaire captures your assets, debts, and wishes — most couples finish in under 90 minutes.
We assemble a complete prenup built to meet your state's exact legal requirements.
Review with your partner, then sign online with notarization handled for you.
A traditional California attorney-drafted prenup typically runs $2,500–$10,000 or more. Trusted Prenup creates a state-specific California prenup online for a flat $599, with optional add-ons for notarization and attorney review.
For agreements signed since January 1, 2020, California law requires that a party receive the final agreement at least seven calendar days before signing it — and that applies whether or not the party has their own lawyer. The statute protects the party an agreement would be enforced against, so the practical rule is that both of you should have the final agreement at least seven calendar days before either of you signs. Nonsubstantive amendments that don't change the terms of the agreement don't restart the clock. Skipping the waiting period is one of the most common reasons California prenups get challenged.
Not for the agreement as a whole — but to waive spousal support, the waiving party must have independent legal counsel. Trusted Prenup offers an optional attorney-review add-on to cover this.
Yes, if it was signed involuntarily, without full financial disclosure, or is unconscionable. Following the 7-day rule and disclosing all assets and debts is how you keep it enforceable.
No — California Family Code § 1611 requires only a written agreement signed by both parties. Notarization is still strongly recommended as proof of who signed and when, and online notarization is included for California couples.
Probably not — but because of the 7-day rule, you should finalize the agreement at least a week before signing, and sign before the wedding. Start now and a California prenup can be done well in time.
Yes — California enforces properly executed prenuptial agreements regardless of how they were drafted. What matters is execution: a written agreement, voluntary signatures, full financial disclosure, and California's signing formalities. The full picture is in are online prenups legally binding.
Trusted Prenup is not a law firm and does not provide legal advice. This guide is general information about California law and not a substitute for advice from a licensed attorney about your situation.