California Prenup Requirements, With Their Effective Dates

What a Premarital Agreement Is Under California Law

Family Code section 1610(a) defines a premarital agreement as "an agreement between prospective spouses made in contemplation of marriage and to be effective upon marriage." People also call it a prenuptial agreement or a prenup. It is a written contract two people make before they marry, and under Family Code section 1613 it "becomes effective upon marriage", meaning on the wedding day and not before.

California's premarital agreement rules sit in Family Code sections 1610 through 1620, with the full text available on the California Legislative Information site. The word "property" in these sections is broad. Section 1610(b) defines it as "an interest, present or future, legal or equitable, vested or contingent, in real or personal property, including income and earnings."

The baseline formal rule is short. Family Code section 1611 says: "A premarital agreement shall be in writing and signed by both parties. It is enforceable without consideration." "Consideration" is the legal term for something of value exchanged for a promise. Section 1611 means neither person has to give the other anything extra to make the agreement binding. A spoken understanding, however sincere, is not a premarital agreement.

Once the couple is married, Family Code section 1614 says the agreement "may be amended or revoked only by a written agreement signed by the parties." A postnuptial agreement, by contrast, is one spouses make after the wedding, and it follows its own set of rules.

What a California Prenup Can and Cannot Cover

Family Code section 1612(a) lists what a couple may contract about. The list is broad:

1. "The rights and obligations of each of the parties in any of the property of either or both of them whenever and wherever acquired or located."
2. The right to buy, sell, use, transfer, lease, mortgage, encumber, dispose of, or "otherwise manage and control property."
3. "The disposition of property upon separation, marital dissolution, death, or the occurrence or nonoccurrence of any other event."
4. "The making of a will, trust, or other arrangement to carry out the provisions of the agreement."
5. "The ownership rights in and disposition of the death benefit from a life insurance policy."
6. "The choice of law governing the construction of the agreement."
7. "Any other matter, including their personal rights and obligations, not in violation of public policy or a statute imposing a criminal penalty."

Family Code section 1500 confirms the larger point: "The property rights of spouses prescribed by statute may be altered by a premarital agreement or other marital property agreement." In practice, this is how a couple can decide in advance how earnings, a home, or other property will be treated if the marriage ends.

Section 1612 also sets two firm limits. The first protects children. Family Code section 1612(b) states: "The right of a child to support may not be adversely affected by a premarital agreement." Whatever the couple agrees between themselves, a child's right to support is outside their bargain.

The second limit governs spousal support, the payments one spouse may owe the other after a separation or divorce. Under Family Code section 1612(c), any spousal-support provision, including a waiver, "is not enforceable if the party against whom enforcement of the spousal support provision is sought was not represented by independent counsel at the time the agreement containing the provision was signed, or if the provision regarding spousal support is unconscionable at the time of enforcement."

There are two separate tests in that rule. The first looks back to signing and asks whether the person had their own lawyer. The second looks at the day someone tries to enforce the term, which may be many years later, and asks whether it is unconscionable then. "Unconscionable" means so one-sided or harsh that a court will not enforce it. Section 1612(c) adds that having independent counsel does not, by itself, rescue a spousal-support term that is otherwise unenforceable.

The Enforceability Requirements: Voluntariness, Disclosure, and Unconscionability

Family Code section 1615(a) puts the burden on the person challenging the agreement. A prenup "is not enforceable if the party against whom enforcement is sought proves either of the following." The challenger must prove the ground, not the other way around.

The first ground is simple to state: "That party did not execute the agreement voluntarily." To "execute" an agreement means to sign it.

The second ground is more involved. It applies when the agreement "was unconscionable when it was executed" and, before signing, all three of these were true for the challenging party:

• "That party was not provided a fair, reasonable, and full disclosure of the property or financial obligations of the other party."
• "That party did not voluntarily and expressly waive, in writing, any right to disclosure of the property or financial obligations of the other party beyond the disclosure provided."
• "That party did not have, or reasonably could not have had, an adequate knowledge of the property or financial obligations of the other party."

Disclosure, then, works inside the unconscionability test rather than standing alone. In plain terms, "full disclosure" means each person showing the other their property and their financial obligations, the assets they own and the debts they owe. A written waiver, or real knowledge of the other person's finances, also counts in this analysis.

Family Code section 1615(b) settles who decides unconscionability: "An issue of unconscionability of a premarital agreement shall be decided by the court as a matter of law." That means a judge answers that question, applying legal standards to the facts.

For someone who has just been handed a draft, this section often explains why the other side's attorney asks for detailed financial schedules. Those lists are the disclosure the statute is talking about.

The Seven-Day Rules and Independent Counsel: Effective Dates Matter

Family Code section 1615(c) tells courts when an agreement is treated as not signed voluntarily. It "shall be deemed that a premarital agreement was not executed voluntarily unless the court finds in writing or on the record" each of several conditions. Two of them involve seven-day periods, and they are easy to confuse.

The advisement rule. Under Family Code section 1615(c)(1), the person must either have had independent legal counsel when signing or, "after being advised to seek independent legal counsel, expressly waived, in a separate writing, representation by independent legal counsel." The timing is fixed: "The advisement to seek independent legal counsel shall be made at least seven calendar days before the final agreement is signed."

The review rule, and its effective date. Family Code section 1615(c)(2) sets the second seven-day period, and the version that applies depends on when the agreement was signed:

• For an agreement signed on or after January 1, 2020, section 1615(c)(2)(B) requires that the person "had not less than seven calendar days between the time that party was first presented with the final agreement and the time the agreement was signed, regardless of whether the party is represented by legal counsel."
• For an agreement signed between January 1, 2002, and January 1, 2020, section 1615(c)(2)(A) required seven calendar days between the time the person "was first presented with the final agreement and advised to seek independent legal counsel" and signing.

The January 1, 2020 date matters for this reason: under the current rule, the seven-day review period applies to everyone, including people who have their own lawyer. For an agreement signed before that date, the earlier version of the rule governs. Both versions say the requirement "does not apply to nonsubstantive amendments that do not change the terms of the agreement", meaning small fixes that leave the terms as they were.

The clock runs from the final agreement. Seven days with an early draft is not the same as seven days with the version that gets signed.

The unrepresented party. California does not require every person to have a lawyer for a valid prenup. Section 1615(c)(1) allows a written waiver of counsel. Family Code section 1615(c)(3) then protects the person who signs without a lawyer. That person must have been "fully informed of the terms and basic effect of the agreement as well as the rights and obligations the party was giving up by signing the agreement," and must be "proficient in the language in which the explanation of the party's rights was conducted and in which the agreement was written."

The statute requires a paper trail: "The explanation of the rights and obligations relinquished shall be memorialized in writing and delivered to the party prior to signing the agreement." On or before signing, the unrepresented person also signs a document confirming they received this information and naming who provided it.

The remaining conditions in section 1615(c) are that the agreement and those writings "were not executed under duress, fraud, or undue influence," that the parties did not lack capacity, and "any other factors the court deems relevant."

One connection is worth holding onto. A valid agreement does not require counsel for both people, but a spousal-support term is enforceable against someone only if that person had independent counsel at signing, as section 1612(c) provides.

When a Prenup Is Signed in San Diego County

A prenup signed in San Diego County is governed by the same California Family Code sections 1610 through 1620 as one signed anywhere else in the state. This site covers California law only.

If a marriage later ends and one spouse asks to enforce or set aside the agreement, that question is decided in the Superior Court of California, County of San Diego. The court files family cases by ZIP code under its ZIP Code List (ADM-254):

• Most family law cases from the ZIP codes the ZIP Code List assigns to the Central Division are filed at the Central Courthouse, 1100 Union Street, San Diego, CA 92101.
• Most family law cases from the ZIP codes assigned to the North County Division are filed at the North County Regional Center, 325 South Melrose Drive, Vista, CA 92081.
• Most family law cases from the ZIP codes assigned to the East County Division are filed at the East County Regional Center, 250 East Main Street, El Cajon, CA 92020.
• Most family law cases from the ZIP codes assigned to the South County Division are filed at the South County Regional Center, 500 3rd Avenue, Chula Vista, CA 91910.

Whichever San Diego courthouse hears the case, a judge there applies the tests in Family Code section 1615 and the limits in section 1612. Couples who live or may move across state lines can also use section 1612(a)(6), which permits an agreement to name "the choice of law governing the construction of the agreement." In other words, the agreement can say which state's law is used to interpret it.

Common Reasons a California Prenup Is Challenged

Challenges generally track the grounds in Family Code section 1615(a): that the agreement was not signed voluntarily, or that it was unconscionable at signing without the disclosure, waiver, or knowledge the statute describes. Courts examine the facts behind each claim. None of the patterns below decides a case by itself.

Timing. An agreement presented and signed on the same day, or with fewer than seven calendar days between first presentation of the final agreement and signing, raises a section 1615(c)(2)(B) question for agreements signed on or after January 1, 2020. Late advice to get a lawyer raises a section 1615(c)(1) question.

Disclosure gaps. A schedule that leaves out significant property or debts can open the door to the unconscionability-and-disclosure ground in section 1615(a)(2).

Spousal support without independent counsel. A spousal-support term may be challenged under section 1612(c) if the person it is enforced against had no lawyer at signing. It can also be challenged if the term is unconscionable when enforcement is sought.

No written explanation for an unrepresented party. If someone signed without a lawyer and never received the written explanation that section 1615(c)(3) requires, or did not sign the acknowledgment, the voluntariness finding becomes harder to make.

Pressure. Section 1615(c)(4) asks whether the agreement was signed under duress, fraud, or undue influence. "Undue influence" means pressure that overcomes a person's free choice.

Section 1617 also addresses time limits. Any statute of limitations on a claim under the agreement "is tolled during the marriage," meaning the clock pauses while the couple is married. However, "equitable defenses limiting the time for enforcement, including laches and estoppel, are available to either party." Laches is a defense for unreasonable delay. Estoppel prevents someone from going back on their own conduct when the other person relied on it.

For a couple still at the drafting stage, this list reads less as a set of warnings and more as a map of what a careful process covers.

What a Prenup Cannot Do: Limits the Statute Sets

The firmest limit protects children. Family Code section 1612(b) says a child's right to support "may not be adversely affected by a premarital agreement." No term in a prenup can reduce or waive it.

Spousal support can be addressed, but only within the conditions of section 1612(c). The term is unenforceable if the person it is enforced against lacked independent counsel at signing, or if the term is unconscionable at the time of enforcement.

Unconscionability as a whole is a question for the court as a matter of law under section 1615(b). The unconscionability ground in section 1615(a)(2) looks at the agreement as of signing.

Finally, the catch-all in section 1612(a)(7) reaches only matters "not in violation of public policy or a statute imposing a criminal penalty." As a general principle, a term that crosses that line is outside what a premarital agreement may do. Section 1616 adds that if the marriage itself is found void, the agreement is "enforceable only to the extent necessary to avoid an inequitable result."