Prenups and Inheritance

How California Treats Inherited Property Without a Prenup

Family Code section 770 sets the starting point. It says that separate property of a married person includes "All property owned by the person before marriage," "All property acquired by the person after marriage by gift, bequest, devise, or descent," and "The rents, issues, and profits" of that property. Separate property means property that belongs to one spouse individually rather than to the couple together. A bequest or devise is something left to a person in a will, and descent is property received from a relative who died without one.

The opposite category is community property, which is, broadly, what the couple acquires through their efforts during the marriage and shares together. The label matters because it controls who owns what when the marriage ends by divorce or by death. Section 770(b) adds that a married person may convey, meaning sell or give away, separate property without the other spouse's consent.

So an inheritance does not become shared just because the person who receives it is married. The practical difficulty comes later.

Commingling and record-keeping

When inherited money is deposited into a joint account, used for a shared home, or mixed with paychecks, the original character can become hard to show. Mixing separate and community funds this way is called commingling. Without a written record, the inheriting spouse may later need to prove where the money came from.

Because the issue is one of proof, the practical habits that tend to matter are the ones that leave a clear trail. Common examples include:

• Holding inherited funds in an account in the inheriting spouse's name alone, apart from joint household accounts.
• Keeping the paperwork that shows the source: estate or trust distribution statements, the deposit record, and statements for the receiving account.
• Keeping a record of any later transfer of inherited money into a shared purchase or account, so the amount and date can be traced.

None of these steps changes the legal rule in section 770. They make it easier to show, later, that a particular asset came from an inheritance. A prenup can work alongside these habits by stating in writing how the couple has agreed to treat inherited property and its income.

Fiduciary duty between spouses

Spouses also owe each other a duty of the highest good faith and fair dealing in transactions between themselves, under Family Code section 721. That duty runs through the whole marriage, including how property is handled.

Where a dispute would be heard in San Diego County

In San Diego County, a divorce case in which the character of inherited property is disputed is heard in the Superior Court of California, County of San Diego, in the division the court's ZIP Code List (ADM-254) assigns to the parties' ZIP code. Most family law cases are filed at one of four courthouses:

• 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 court's own information is available from the Superior Court of California, County of San Diego.

What a Premarital Agreement Can Cover Under Family Code § 1612

Family Code section 1500 says the property rights spouses have by statute "may be altered by a premarital agreement or other marital property agreement." Section 1612(a) then lists what a premarital agreement may address. Under Family Code section 1612, the parties may contract with respect to all of the following:

(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, exchange, abandon, lease, consume, expend, assign, create a security interest in, 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.

For inheritance, three phrases carry the most weight. "Whenever and wherever acquired" reaches property received before the marriage, during it, or not yet received at all. "Disposition of property upon separation, marital dissolution, death" lets the agreement address both ways a marriage might end. "The making of a will, trust, or other arrangement" lets the agreement tie into the documents that carry its terms out.

In plain terms, a prenup can say that an inheritance stays separate, how it is managed during the marriage, how it passes when a spouse dies, and whether the other spouse keeps any claim to it. The statute treats property rights during the marriage and disposition at death as two distinct subjects, and both sit inside section 1612's scope.

Inheritance Received Before Marriage vs. During Marriage

An inheritance received before the wedding is already separate property under section 770(a)(1). A prenup adds clarity about what happens next: whether growth in value stays separate, whether income from the property stays separate, and what happens if some of it goes toward a shared purpose like a down payment. The agreement can set those answers in advance instead of leaving them to be worked out later.

An inheritance received during the marriage is also separate property, under section 770(a)(2). Here the risk of commingling tends to be higher. The money arrives while the couple already has joint accounts, shared bills, and a household budget, and it is easy for a deposit to land in the wrong place. Someone in this position often worries less about the law than about everyday habits blurring the line, which is where the record-keeping practices described above become relevant.

For an inheritance not yet received, the statute's own definitions help. Section 1610(b) defines property as "an interest, present or future, legal or equitable, vested or contingent." Read with section 1612(a)(1), that allows a prenup to provide that any future bequest, devise, or gift to one spouse remains that spouse's separate property throughout the marriage.

A written provision like this can reduce the need to reconstruct, years later, where a particular dollar came from. It does not erase every question, since how money is actually handled still matters, but it states the couple's agreed starting point.

Changing the character of inherited property later

Separate property does not always stay separate in practice. A spouse may later decide to put inherited property into joint names or contribute it to a shared purchase. California law has its own rules for when spouses change the character of property during marriage, often called transmutation, and those rules are separate from the premarital agreement statutes discussed on this page. A prenup can state in advance how the couple intends inherited property to be treated, which gives a written reference point if questions about a later change arise.

What a prenup does not control

A prenup is an agreement between the two spouses. It governs their rights as between themselves. It does not control what a parent, grandparent, or other relative chooses to leave in their own estate plan.

Disposition at Death: Wills, Trusts, and the Prenup's Role

Section 1612(a)(4) permits a premarital agreement to address "the making of a will, trust, or other arrangement to carry out the provisions of the agreement." In practice, that means the prenup can require each spouse to sign, and keep in place, a will or trust that matches what the agreement says about inherited property. The agreement sets the promise, and the will or trust carries it out.

Surviving spouse rights

California law generally gives a surviving spouse certain rights when the other spouse dies. Because section 1612(a)(3) reaches "the disposition of property upon... death," a prenup can address how those rights apply to inherited property as between the spouses, including whether a surviving spouse keeps any claim to it.

Life insurance

Life insurance gets its own line. Section 1612(a)(5) allows the parties to agree on "the ownership rights in and disposition of the death benefit from a life insurance policy." Some couples use this to give a surviving spouse a source of support while the inherited property itself passes elsewhere.

Coordinating with a will or living trust

A prenup that addresses death-time disposition works best when it is consistent with the couple's actual estate planning documents. Many people hold property through a revocable living trust, and the "trust, or other arrangement" language in section 1612(a)(4) covers that kind of document. When the prenup says inherited property passes one way and the trust or will says something else, the mismatch itself can become the source of a dispute. The prenup does not replace those documents. It sits alongside them, and the two are typically reviewed together so that they point in the same direction.

Amending the agreement after marriage

After the wedding, the terms are not frozen. Under Family Code section 1614, a premarital agreement may be amended or revoked only by a written agreement signed by both parties.

Enforceability: What Makes an Inheritance Prenup Hold Up

Family Code section 1611 starts with the basics: "A premarital agreement shall be in writing and signed by both parties. It is enforceable without consideration." Consideration means something of value exchanged for the promise, and a prenup does not need one.

The main test sits in Family Code section 1615. A premarital agreement is not enforceable if the party it is being enforced against proves either of two things. The first is that the party did not sign voluntarily. The second is that the agreement was unconscionable when signed, and, before signing, that party lacked a fair, reasonable, and full disclosure of the other's property or financial obligations, did not voluntarily waive further disclosure in writing, and did not have, or could not reasonably have had, adequate knowledge of those finances. Unconscionable means so one-sided that it shocks the conscience. Section 1615(b) says the court decides that question as a matter of law.

Voluntariness has specific conditions. Under section 1615(c), an agreement is deemed not voluntary unless the court finds, among other things:

• The party had independent legal counsel when signing, or, after being advised to seek independent counsel, expressly waived it in a separate writing. That advisement to seek counsel must come at least seven calendar days before the final agreement is signed.
• Separately, for an agreement signed on or after January 1, 2020, the party had at least seven calendar days between first being presented with the final agreement and signing it, whether or not the party had a lawyer. Nonsubstantive amendments that do not change the terms are excepted.
• An unrepresented party was fully informed in writing of the terms, the basic effect, and the rights being given up, was proficient in the language used, and signed a document confirming receipt of that information and who provided it.
• The agreement and related writings were not signed under duress, fraud, or undue influence, and neither party lacked capacity.
• Any other factors the court deems relevant.

For inheritance provisions, disclosure deserves attention. When one person expects a substantial inheritance, describing that expectation in the disclosure, even before anything is received, gives the other person the financial picture section 1615 is concerned with. That can support the agreement if it is ever questioned.

Two limits in section 1612 also apply. Under section 1612(a)(7), the parties' freedom to contract does not extend to matters that violate public policy or a statute imposing a criminal penalty. Under section 1612(b), a child's right to support may not be adversely affected by a premarital agreement. Section 1612(c) adds that a spousal support provision is not enforceable if the party it is enforced against lacked independent counsel when signing, or if the provision is unconscionable at the time of enforcement.