California Uniform Premarital Agreement Act: 7-Day Wait, Waivers

Under the California Uniform Premarital Agreement Act, a prenup is valid only if it meets a specific set of requirements: it must be in writing and signed by both parties, signed voluntarily at least seven days after the final version was presented, backed by fair and full financial disclosure (or a written waiver of it), and, when it waives spousal support, signed by a party who had independent legal counsel. The rules sit in Family Code Sections 1610 through 1617, and missing any of them can void the agreement at the moment it matters most.¹

Writing, Signing, and When It Takes Effect

The agreement has to be in writing and signed by both parties. Oral promises about property or finances carry no weight.¹ Unlike most contracts, a prenup does not require consideration; neither party has to exchange anything of value for it to bind.

A prenup becomes effective only when the marriage actually happens.² If the wedding is called off, the document has no force. And an agreement signed after the wedding is not a prenup under this statute at all; it falls under California’s separate postnuptial rules.

Notarization is not required, but it helps prove proper execution if the agreement is later challenged. Ambiguous language will be read against the party who drafted it, so clarity in the drafting stage protects the party pushing for the agreement.

The Seven-Day Waiting Period

For prenups signed on or after January 1, 2020, at least seven calendar days must pass between the day a party is first given the final agreement and the day they sign. The rule applies whether or not the person has a lawyer.³ Presenting a prenup the night before the wedding is the fastest way to lose it in court.

The seven-day clock starts when the final version is delivered. Substantive changes after that reset the clock. Purely cosmetic edits that do not alter the terms do not.

Independent Counsel or a Documented Waiver

The party being asked to sign must either have their own independent attorney at signing or expressly waive that right in a separate written document. The advisement to seek independent counsel has to happen at least seven days before signing.³

An unrepresented party gets extra protection. That person must be fully informed of the agreement’s terms, its practical effects, and the rights being given up. The explanation has to be in a language the person speaks fluently, documented in writing, and delivered before signing. The unrepresented party then signs a separate statement confirming they received the information. Skip any piece of this and the agreement is exposed to a voluntariness challenge.

Financial Disclosure and Unconscionability

Disclosure is not a standalone requirement. It matters when someone attacks the agreement as unconscionable. A court will refuse to enforce a prenup if it was unconscionable when signed and all three of the following were true:³

The challenging party was not given a fair and full disclosure of the other person’s property and financial obligations.
That party did not voluntarily waive, in writing, any right to further disclosure.
That party did not have, and could not reasonably have had, adequate knowledge of the other person’s finances.

Because all three conditions have to line up, thorough disclosure is the cleanest defense. Real estate, investment accounts, business interests, bank balances, debts, and tax obligations typically go into it. Many couples attach tax returns, account statements, and balance sheets to the agreement itself. There is no required format, but the disclosure has to be detailed enough for the other party to meaningfully evaluate the deal. If finances change significantly between disclosure and signing, update it.

Spousal Support Provisions

Spousal support waivers face stricter rules than the rest of the agreement. A provision waiving or limiting support is unenforceable if either of two things is true: the party against whom enforcement is sought did not have independent legal counsel when signing, or the provision is unconscionable at the time of enforcement.⁴

The counsel requirement here is absolute. A party cannot waive it in writing the way they can for other prenup provisions. Having a lawyer is also not a guarantee: the statute expressly says an otherwise unenforceable spousal support term does not become enforceable just because counsel was present.

The unconscionability test looks at the time of enforcement, not the time of signing. A waiver that read as reasonable when both spouses were earning professionals can turn unconscionable if one left work to raise children, developed a serious health condition, or grew financially dependent over a long marriage. Courts weigh earning capacity, age, health, standard of living during the marriage, and whether enforcement would leave one spouse destitute.

What a Prenup Can and Cannot Cover

The statute gives couples wide latitude. It lists specific subjects and then adds “any other matter” that does not violate public policy or criminal law.⁴ Common subjects include:

Each party’s rights and obligations in either person’s property, whenever and wherever acquired.
The right to buy, sell, transfer, mortgage, or otherwise control property during the marriage.
How property will be divided on separation, divorce, or death.
Provisions for wills, trusts, or other arrangements that carry out the agreement’s terms.
Ownership and distribution of life insurance death benefits.
The choice of state law governing the agreement.
Spousal support, subject to the extra rules above.

Debts can be handled the same way. A prenup can specify that a pre-marriage student loan stays the responsibility of the spouse who took it on, and can set how debts incurred during the marriage will be allocated at divorce.

One hard limit: a prenup cannot reduce a child’s right to support.⁴ Child support and custody are decided on the child’s best interests at the time of divorce, and no pre-marriage agreement can override that.

Property terms that leave one spouse with essentially nothing can still be attacked as unconscionable, especially where disclosure was thin.

Retirement Accounts: A Federal Gap

A prenup can address retirement accounts under California law, but federal law adds a wrinkle that catches many couples out. Under the Employee Retirement Income Security Act, a spouse’s right to survivor benefits from a pension or 401(k) plan cannot be waived before the marriage takes place.⁵

ERISA requires the waiver to come from a spouse, meaning the parties must already be married. It also has to be in writing, name an alternate beneficiary, and be witnessed by a plan representative or notary. A document signed before the wedding cannot meet those requirements because neither person is yet a spouse under the statute.

The workaround is to put the waiver in the prenup and then confirm it in a postnuptial agreement signed shortly after the wedding. Without that follow-up step, the retirement provisions in the prenup can be unenforceable even when every California requirement was followed to the letter.

Amending or Revoking After Marriage

Once married, spouses can change or cancel the agreement, but only by mutual consent. Any amendment or revocation has to be in writing and signed by both parties, and again, no exchange of value is needed to make the change binding.⁶

Later disputes often center on claims that one spouse was pressured into a modification. Treating amendments with the same formality as the original prenup — independent counsel on both sides, written records, and time to review — is what defeats that argument. Notarizing the amendment adds another layer of proof.

1
California Legislative Information. California Code FAM 1611 – Uniform Premarital Agreement Act
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California Legislative Information. California Code FAM 1613 – Uniform Premarital Agreement Act
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California Legislative Information. California Code FAM 1615 – Uniform Premarital Agreement Act
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California Legislative Information. California Code FAM 1612 – Uniform Premarital Agreement Act
5
Office of the Law Revision Counsel. 29 U.S.C. 1055 – Requirement of Joint and Survivor Annuity and Preretirement Survivor Annuity
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California Legislative Information. California Code FAM 1614 – Uniform Premarital Agreement Act