Family · Prenuptial agreement
Prenuptial Agreement Requirements in California
What makes a prenuptial agreement valid and enforceable in California: the writing and signature, the voluntariness rule, the financial disclosure each side must give, and what gets a prenup thrown out. Cited to the statute.
What makes a prenuptial agreement valid in California
The writing and signature, voluntariness, and financial disclosure a court looks for before it will enforce a prenup.
Prenuptial agreement enforceability turns on the specific facts and on evolving case law, and California courts scrutinize these agreements closely, especially the seven-day review and independent-counsel rules that followed In re Marriage of Bonds. Confirm the current text of Family Code sections 1610 through 1617 and recent decisions before relying on this.
| What makes a prenup valid | What it means |
|---|---|
| In writing and signed by both | Under Family Code section 1611, a premarital agreement must be in writing and signed by both parties. An oral premarital agreement is not enforceable. |
| Signed voluntarily | Under section 1615, the agreement must be executed voluntarily. A court will not find voluntary execution unless the statutory safeguards, including the timing and counsel requirements, are met. |
| Presented at least seven calendar days before signing | For the agreement to count as voluntary, the party against whom enforcement is sought must have had at least seven calendar days between first being presented with the agreement and advised to seek independent counsel and the day the party signed it. |
| Independent counsel or a written waiver of counsel | The party must have been represented by independent legal counsel when signing, or, after being advised to seek independent counsel, must have expressly waived that representation in a separate writing. |
| Fair financial disclosure or a written waiver | Before signing, each party must have received a fair, reasonable, and full disclosure of the other’s property and financial obligations, or have voluntarily and expressly waived that disclosure in writing, or already have had adequate knowledge of the other’s finances. |
| What makes a prenup unenforceable | What it means |
|---|---|
| Signed involuntarily | If the party against whom enforcement is sought did not sign voluntarily, the agreement is not enforceable. Duress, coercion, or a lack of the seven-day review and independent-counsel safeguards can defeat voluntariness. |
| Unconscionable when signed with no disclosure or waiver | The agreement is unenforceable if it was unconscionable when executed and the challenging party was not given a fair disclosure, did not waive disclosure in writing, and could not reasonably have known the other party’s finances. |
| Terms that adversely affect child support | Under section 1612, a premarital agreement cannot adversely affect a child’s right to support. Child support and child custody are decided by the court in the child’s best interest and cannot be fixed in advance by the parents. |
| Certain spousal support provisions | A provision limiting or waiving spousal support is not enforceable if the party against whom it is sought was not represented by independent counsel when signing, or if the provision is unconscionable at the time enforcement is sought. |
What you can do right now
Concrete, neutral steps to sign a prenup that will hold up in California. This is legal information, not legal advice.
- Put it in writing well before the wedding
Have the agreement drafted and delivered in writing early, and make sure the party who did not draft it has at least the seven calendar days California requires to review it before signing.
- Exchange full financial disclosure
Both people should exchange a complete and honest list of assets, debts, and income. Keep records of what was disclosed, or of any written waiver of disclosure, so the agreement can survive a later challenge.
- Each person should use independent counsel
Each party should hire a separate lawyer, or knowingly waive counsel in a separate writing after being advised to seek it, because California ties voluntariness to independent representation.
A prenuptial agreement decides property and support if a marriage ends, and a court will scrutinize how it was signed. A licensed family-law attorney can draft or review one; the state bar can refer you to one.
→ State Bar of California, Lawyer Referral ServicesThis is general legal information, not legal advice. Enforceability turns on the exact statute, the case law, and how the agreement was signed, so confirm the current requirements against the statute and talk to a lawyer.
What couples in California get wrong about prenups
California enforces premarital agreements under its version of the Uniform Premarital Agreement Act, found at Family Code sections 1610 through 1617. The agreement must be in writing and signed by both parties, and under section 1615 it is not enforceable if the challenging party proves either that it was not signed voluntarily or that it was unconscionable when signed and there was no fair and reasonable financial disclosure that the party did not waive in writing and could not otherwise have known. After the California Supreme Court decision In re Marriage of Bonds in 2000, the Legislature tightened the voluntariness rules. A California prenup is treated as voluntary only if the party against whom it is enforced was represented by independent legal counsel or expressly waived counsel in a separate writing, and only if that party had at least seven calendar days between first receiving the agreement and being advised to seek counsel and the day of signing. California also limits spousal support waivers and, under section 1612, does not allow a premarital agreement to adversely affect a child’s right to support. This is legal information, not legal advice.
Common questions
Does a prenuptial agreement have to be notarized in California?
California law requires the agreement to be in writing and signed by both parties, not notarized. What matters most is that it was signed voluntarily, with the seven-day review period and independent counsel or a written waiver, and after fair financial disclosure.
Can a California prenup decide child support or custody?
No. Under Family Code section 1612 a premarital agreement cannot adversely affect a child’s right to support, and courts decide child support and custody based on the child’s best interest. Parents cannot fix those terms in advance.
What makes a prenuptial agreement unenforceable in California?
It can be thrown out if the party proves it was signed involuntarily, for example without the seven-day review or independent counsel, or that it was unconscionable when signed and there was no fair disclosure and no written waiver of disclosure.
Do both people need their own lawyer for a California prenup?
For the agreement to count as voluntary, the party against whom it is enforced must have had independent counsel or expressly waived counsel in a separate writing after being advised to get it. Using separate lawyers is the safest path.
Not legal advicePlainStatute provides plain-language summaries of public law for general information only. This is not legal advice. Statutes change; always confirm current requirements with the official source linked above before acting.