Separate Property and Prenups: Planning, Not Tracing

What California Law Says About Separate Property

California is a community property state, and Family Code section 760 sets the starting point: "Except as otherwise provided by statute, all property, real or personal, wherever situated, acquired by a married person during the marriage while domiciled in this state is community property." Community property means property that belongs to both spouses together, whichever spouse earned or bought it.

Family Code section 770 defines the other category. Separate property includes:

• all property a person owned before marriage;
• all property acquired after marriage "by gift, bequest, devise, or descent," which in plain terms means gifts and inheritances; and
• the rents, issues, and profits of that property, such as rent from a premarital rental unit.

Section 770 also allows a married person to sell or give away their separate property without the other spouse's consent.

Put simply, the date and source of property matter. A paycheck earned during the marriage is generally community property. An investment account opened before the wedding, and the dividends it produces, is generally separate. An inheritance received during the marriage is separate under section 770.

When there is no written agreement, these default rules decide the question. In a dissolution, Family Code section 2550 directs the court to divide the community estate equally "except upon the written agreement of the parties," or an oral stipulation in open court, or as the statutes otherwise provide. That opening phrase is where a premarital agreement fits.

How a Premarital Agreement Changes the Default Rules

The statutory permission is one sentence long. Family Code section 1500 reads: "The property rights of spouses prescribed by statute may be altered by a premarital agreement or other marital property agreement."

The rules in sections 760 and 770 therefore work as defaults that a couple can change. Family Code section 1610 defines a premarital agreement as "an agreement between prospective spouses made in contemplation of marriage and to be effective upon marriage." Section 1611 requires it to be in writing and signed by both parties. Section 1613 provides that it becomes effective upon marriage.

Family Code section 1612(a) lists what the parties may contract about. For separate property, the first item carries the most weight:

"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."

The words "whenever and wherever acquired" mean the agreement is not limited to what each person brings into the marriage. It can also reach property acquired after the wedding, including income and earnings, which section 1610 includes in its definition of "property."

The list continues. Section 1612(a)(2) covers the right to buy, sell, use, manage, and control property. Section 1612(a)(3) covers "The disposition of property upon separation, marital dissolution, death, or the occurrence or nonoccurrence of any other event." Section 1612(a)(4) addresses "The making of a will, trust, or other arrangement to carry out the provisions of the agreement." Section 1612(a)(5) covers "The ownership rights in and disposition of the death benefit from a life insurance policy." Section 1612(a)(6) covers "The choice of law governing the construction of the agreement." Section 1612(a)(7) allows other matters that do not violate public policy or a statute imposing a criminal penalty.

This is what "planning, not tracing" means on this page. A prenup can settle whether a particular account, home, or business interest is separate or community while both people are calm, the documents are at hand, and the facts are fresh. The alternative is answering the same question years later, after the money has moved.

What a Prenup Can — and Cannot — Address

The scope of section 1612(a) is broad. A premarital agreement can address rights in existing property and future property, how property is managed during the marriage, how it is distributed on dissolution or death, and how spousal support is handled.

Spousal support carries its own conditions. Under section 1612(c), a spousal support provision, including a waiver, is not enforceable if the person it is enforced against "was not represented by independent counsel at the time the agreement containing the provision was signed." It is also unenforceable if the provision "is unconscionable at the time of enforcement," which means grossly unfair when someone asks a court to apply it. That second test looks at the provision years after signing, not only on the day it was signed. Section 1612(c) also states that independent counsel alone does not make an otherwise unenforceable support provision enforceable.

The firm limits in section 1612 are short. Under section 1612(b), "The right of a child to support may not be adversely affected by a premarital agreement." Under section 1612(a)(7), any other matter the parties include must not violate public policy or a statute imposing a criminal penalty.

For couples focused on separate property, the practical result is that the property side of a prenup has wide room, while support provisions are tested more closely.

Enforceability: What California Courts Examine

Family Code section 1615 sets the grounds for refusing to enforce a premarital agreement. The person challenging the agreement has the burden of proof. That person must prove one of two things:

1. The agreement was not signed voluntarily.
2. The agreement was unconscionable when signed, and before signing, all three of these were true for that person: they did not receive "a fair, reasonable, and full disclosure of the property or financial obligations of the other party"; they did not voluntarily and expressly waive further disclosure in writing; and they did not have, or reasonably could not have had, adequate knowledge of the other party's finances.

Under section 1615(b), the court decides unconscionability as a matter of law.

Section 1615(c) gives "voluntary" a specific meaning. An agreement is deemed not voluntary unless the court finds, in writing or on the record, that:

• the challenging party had independent legal counsel when signing, or was advised to get counsel at least seven calendar days before signing and then waived counsel in a separate writing;
• for agreements signed on or after January 1, 2020, that party had at least seven calendar days between first receiving the final agreement and signing it, whether or not they had a lawyer (an earlier version of this rule applies to agreements signed between 2002 and 2020);
• if unrepresented, that party was fully informed in writing of the agreement's terms and the rights given up, was proficient in the language used, and signed a document confirming they received that explanation;
• there was no duress, fraud, or undue influence, and both parties had capacity; and
• any other factors the court considers relevant are satisfied.

The seven-day periods are minimums, not suggested timelines. Couples in the last month before a wedding often feel the calendar closing in, and section 1615 is written with that pressure in mind. A full financial disclosure exchanged early, and a final draft delivered well before the signing date, are part of what the court later reviews.

If an agreement is challenged in a San Diego County divorce, the case is heard in the San Diego Superior Court division its ZIP code is assigned to. There are four: Central, North County, East County, and South County. Following these steps does not promise any particular result. Whether an agreement holds up depends on the facts the court finds.

The Tracing Problem a Prenup Solves

Tracing means following separate property through records to show that it is still separate. Once a premarital savings account has been mixed with paychecks, used for a down payment, and refinanced into a jointly titled home, the spouse claiming a separate interest has to rebuild that history from statements, closing documents, and transfer records. Years in, some of those records may no longer exist.

Family Code section 2640 shows how much depends on this. When a spouse puts separate-property money into community property, such as a down payment on a home bought during the marriage, section 2640(b) generally reimburses that spouse "to the extent the party traces the contributions to a separate property source." Reimbursement is paid without interest and cannot exceed the property's net value at division. It is also lost if the spouse signed a written waiver. Section 2640(a) counts down payments, improvements, and principal reduction, but not interest, maintenance, insurance, or taxes. Section 2640(c) applies a similar reimbursement rule to separate-property contributions to the other spouse's separate property.

The opposite situation has its own name: Moore/Marsden apportionment. It applies when community money, such as marital earnings, pays down the loan on a home that one spouse owned separately before the marriage. In that case the community may hold an interest in the separate-property home. This is a different rule from section 2640, and the two are easy to mix up.

Both situations depend on evidence that is gathered after the fact. A premarital agreement can decide them in advance. It can state whether a premarital home stays separate even if marital earnings pay the mortgage, how a down payment from an inheritance will be treated, and whether reimbursement rights are kept or waived. Clear terms can reduce the need for tracing, and in some cases remove it.

Postnuptial Agreements: The Same Framework After the Wedding

The words "or other marital property agreement" in section 1500 cover agreements made after the wedding. These are commonly called postnuptial agreements. They are a separate instrument from a prenup because they are signed by people who are already married.

The rules in sections 1610 through 1615 are written for premarital agreements. A postnup is reviewed under a different framework. Under Family Code section 721, spouses dealing with each other owe "a duty of the highest good faith and fair dealing," and neither may take unfair advantage of the other. Section 721 also requires each spouse to give true and full information about community property transactions on request. Under Family Code section 852, changing the character of property, called a transmutation, is generally valid only if made "in writing by an express declaration" accepted by the spouse whose interest is adversely affected.

In practice, a postnup also depends on a clear writing and honest disclosure. Because the spouses already owe each other fiduciary duties, the agreement is reviewed with that relationship in mind.

How San Diego County Cases Are Filed

The Superior Court of California, County of San Diego, assigns family law cases to one of four divisions using its ZIP Code List (ADM-254). Most family law cases from the ZIP codes assigned to each division are filed there:

• Central Division: Central Courthouse, 1100 Union Street, San Diego, CA 92101
• North County Division: North County Regional Center, 325 South Melrose Drive, Vista, CA 92081
• East County Division: East County Regional Center, 250 East Main Street, El Cajon, CA 92020
• South County Division: South County Regional Center, 500 3rd Avenue, Chula Vista, CA 91910

The same California statutes apply in every division. If a premarital agreement is offered or challenged in a San Diego County dissolution, the court in that division applies sections 1612 and 1615 to it, and section 2550's equal-division rule to whatever the agreement leaves as community property.