California Prenup Requirements: Timing, Lawyers, Disclosure and Enforceability

California prenuptial agreements have specific requirements concerning signing, timing, independent legal advice, financial disclosure, and enforceability. An agreement may appear straightforward when signed but become disputed years later if those requirements were not addressed carefully. These answers explain the legal rules couples should understand before signing.

The rules at a glance

Must a California prenup be notarized?

No. The Family Code requires a written agreement signed by both people, and it is enforceable without any payment or other consideration (§ 1611). Many couples still have signatures notarized because it documents who signed and when, and notarization is needed if a document will be recorded with the county recorder.

When must the final agreement be provided before signing?

The person signing must have at least seven calendar days between first receiving the final agreement and signing it, whether or not that person has a lawyer (§ 1615(c)(2)). The rule does not apply to nonsubstantive changes that leave the terms the same. A change to the terms creates a new final agreement, so plan for the clock to start again. Seven days is a minimum, not a target; courts can also consider any other circumstances bearing on whether the signature was voluntary.

Must both people have independent lawyers?

Not for every agreement. But the statute treats an agreement as not signed voluntarily unless a court finds, among other things, that the person was represented by an independent lawyer when signing or waived that right in a separate writing after being advised, at least seven calendar days before signing, to get one (§ 1615(c)(1)). And a spousal support limit or waiver is not enforceable against someone who had no independent lawyer when signing (§ 1612(c)). In practice, each person having a lawyer is the safer course. One lawyer cannot represent both of you.

Can someone waive independent counsel?

Yes, in a separate written waiver after being advised to seek counsel. That advice must be given at least seven calendar days before the final agreement is signed (§ 1615(c)(1)), which is a separate requirement from the seven days after the final agreement is presented. An unrepresented person must also be fully informed in writing, in a language they are proficient in, of the agreement’s terms and basic effect and of the rights they are giving up, and must sign a document confirming they received that information and who provided it (§ 1615(c)(3)). Even with a valid waiver, a spousal support provision cannot be enforced against that person.

What financial disclosure is required?

An agreement is not enforceable if it was unconscionable when signed and, before signing, the person (1) did not receive a fair, reasonable and full disclosure of the other’s property and financial obligations, (2) did not voluntarily and expressly waive further disclosure in writing, and (3) did not have, and reasonably could not have had, adequate knowledge of them (§ 1615(a)(2)). The practical answer is full schedules of assets, debts and income attached to the agreement. Disclosure doesn’t need to be perfect, but it should be fair and complete.

Can a prenup waive or limit spousal support?

Yes. The provision is not enforceable if the person giving up support had no independent lawyer when signing, or if the provision is unconscionable at the time someone tries to enforce it (§ 1612(c)). That second test looks at circumstances years later, such as children, a career break or illness, so it is worth thinking through how the terms would work in more than one future.

Can a prenup decide future child support or custody?

No. A premarital agreement cannot adversely affect a child’s right to support (§ 1612(b)). Writing in a higher-than-guideline amount does not make that future obligation binding; if support is ever needed, the court decides it based on the circumstances then. Custody and parenting time are decided on the child’s best interests at the time.

Can a prenup be changed after marriage?

Yes, but only by a written agreement signed by both spouses (§ 1614). Once you are married, you owe each other fiduciary duties, so an amendment that benefits one spouse can draw closer scrutiny. Agreements made after the wedding follow different rules; see Postnuptial Agreements.

What makes a prenup unenforceable?

• The person challenging it shows it was not signed voluntarily. A court considers counsel or a written waiver, the seven-day rule, the written explanation for an unrepresented person, duress, fraud, undue influence, capacity and any other relevant factors (§ 1615(a)(1), (c)).
• It was unconscionable when signed and the disclosure conditions above were not met (§ 1615(a)(2)).
• A spousal support provision fails the counsel or unconscionability test (§ 1612(c)).
• A term affects child support or custody, or violates public policy.

If one provision fails, whether the rest of the agreement survives depends on its severability clause and the circumstances.

Some couples prefer to work out these terms together with a neutral attorney-mediator before each person’s lawyer reviews the draft; see negotiating a prenup together through mediation. If you have a draft to review or need one prepared, talk with Scott Levin about your prenup.

General information, not legal advice.

Sources: California Family Code § 721, § 1611, § 1612, § 1613, § 1614, § 1615.