Marriage does not override a trust in California, but it rarely leaves one untouched either. When a person creates a trust and then marries without updating it, California’s omitted spouse law gives the new spouse an automatic claim to a sizable portion of the trust’s assets. The trust still exists, its named beneficiaries still inherit, but the spouse’s statutory share comes off the top before anyone else sees a dollar. A handful of exceptions can block that claim, and separate community property rules can reach into trust assets through a different door entirely.
What the New Spouse Automatically Gets
California Probate Code Section 21610 is the law that does the work. If the trust was signed before the marriage and never updated, the surviving spouse is treated as “omitted” by oversight rather than by choice, and the statute hands them a share of the estate.1California Legislative Information. California Code Probate Code Section 21610
That share comes in three parts:
- The decedent’s one-half of all community property in the estate.
- The decedent’s one-half of all quasi-community property, meaning assets acquired while the couple lived in another state that would have been community property under California law.
- A share of the decedent’s separate property equal to what the spouse would have inherited if there were no trust or will at all, capped at one-half of the separate property in the estate.
The separate property piece is where the numbers get sharp. It borrows from California’s intestate succession rules in Probate Code Section 6401, so the answer depends on who else survived the decedent:2California Legislative Information. California Code Probate Code PROB 6401
- No surviving children, parents, or siblings: the spouse would inherit all separate property under intestate rules, but the statutory cap limits recovery to one-half.
- One surviving child, or the descendants of one deceased child: the spouse receives one-half of the separate property.
- More than one surviving child: the spouse receives one-third of the separate property.
Picture a trust creator with three children and significant separate property held in the trust. The children are the named beneficiaries. After a late-in-life marriage without any update to the documents, the new spouse walks in with a claim to one-third of the separate property plus half of all community and quasi-community property. The trust is not void, but what the children actually receive is dramatically smaller than the document promised.
When the Trust Holds Up Against the Claim
Probate Code Section 21611 lists four situations where the omitted spouse gets nothing, even without an update to the trust.3California Legislative Information. California Code Probate Code Section 21611
Intentional Omission on the Face of the Document
If the trust itself shows that the creator deliberately excluded the spouse, the statute does not apply. The intent has to appear in the instrument. Vague references to “providing for my family” are not enough; courts look for explicit language addressing the possibility of a future spouse and the choice to exclude them. Oral statements or notes outside the trust documents do not satisfy this exception.
Provision Outside the Trust
If the decedent already provided for the spouse through non-trust assets, and intended those transfers to take the place of a trust share, the statutory claim is blocked. Life insurance proceeds, retirement account beneficiary designations, and payable-on-death bank accounts all qualify in principle. There has to be evidence that the decedent meant the transfer as a substitute. Courts weigh the decedent’s statements, the size of the transfer relative to the estate, and when the arrangement was made.
Valid Written Waiver
A spouse who signed a valid waiver of their inheritance rights cannot later claim an omitted spouse share. The rules for these waivers are strict enough to deserve their own treatment below.
Care Custodian Marriages
California added a protection aimed at elder abuse. If the spouse served as a care custodian for a dependent-adult decedent, the marriage began during or within 90 days of that caregiving relationship, and the decedent died less than six months after the wedding, the spouse is presumed barred from taking a share. The spouse can still recover by proving with clear and convincing evidence that the marriage was not the result of fraud or undue influence.
The burden of proof on any of these exceptions falls on whoever is trying to defeat the spouse’s claim, usually the trustee or another beneficiary. Without solid evidence, the default protections win.
Prenuptial and Postnuptial Waivers
The single most reliable way to keep a trust intact against a future spouse’s claim is a written waiver. California Probate Code Sections 140 through 147 govern how these work, and a waiver can cover the omitted spouse share, intestate rights, family allowance, and other statutory entitlements. It can be signed before the wedding as part of a prenuptial agreement or afterward as a postnuptial.4Justia. California Code Probate Code – Surviving Spouse’s Waiver of Rights
For the waiver to be enforceable, the spouse must have received a fair and reasonable disclosure of the other person’s property and financial obligations before signing. A waiver signed without that disclosure can still hold up, but only if the spouse separately waived the disclosure requirement after getting advice from independent legal counsel. A waiver signed without any independent counsel at all is exposed to challenge.5California Legislative Information. California Code Probate Code PROB 143
Waivers signed at the kitchen table, or ones where the wealthier spouse understated the size of the estate, invite litigation. A properly executed waiver with full disclosure and independent counsel on both sides is the strongest shield a pre-existing trust can carry into a marriage.
Community Property Can Reach Trust Assets a Different Way
Even when the omitted spouse statute does not apply, or when the trust creator survives and the question is divorce rather than death, marriage can still create ownership interests in trust assets through community property law. A trust funded entirely with separate property on day one can quietly develop a community interest over the years of a marriage whenever marital income or labor is used to maintain, improve, or pay down debt on the trust’s property.
Mortgage Payments on a Trust Home
The common fact pattern: one spouse owned a house before marriage, placed it in a trust, and then used earnings during the marriage to make mortgage payments. The community acquires a proportional interest in that home. California courts use the Moore-Marsden calculation, named after two appellate decisions from the early 1980s, to measure the community share based on the principal paid down with marital funds and the appreciation attributable to those payments.6California Courts. Property and Debts in a Divorce The spouse’s name does not need to appear on the deed or in the trust for the interest to exist. The financial contribution is what creates it.
Businesses Held in the Trust
When a trust holds a business owned before the marriage, and the owner-spouse keeps running it after the wedding, the community can acquire an interest in the growth. California courts use two different formulas depending on what caused the increase in value:
- The Pereira approach applies when growth was driven mainly by the spouse’s labor during the marriage. The original value stays separate property along with a reasonable rate of return on it; everything above that becomes community.
- The Van Camp approach applies when growth was driven by market forces or the nature of the business rather than the spouse’s daily work. The community receives the value of a fair salary for the spouse’s labor, minus what was already paid for community living expenses, and the rest stays separate.
Which formula a court picks turns on the facts, and the gap between the two outcomes can be very wide. The trust’s original terms do not override this analysis.
Revocable Versus Irrevocable Trusts
The type of trust changes the exposure. A revocable living trust, the standard California estate planning tool, is treated essentially like a will for omitted spouse purposes because the creator kept the power to amend or revoke it. Failing to update one after marriage triggers the full Section 21610 claim.
Irrevocable trusts stand on different ground because the creator gave up control. Whether a spouse can reach into one depends on when it became irrevocable, how it was funded, and whether any community property was commingled into it after the marriage. An irrevocable trust funded entirely with separate property before the wedding, with no community contributions afterward, is the strongest position. If marital funds paid life insurance premiums held by the trust, or community labor maintained its property, community property claims can still attach to those contributions.
What to Do After Getting Married
Updating the trust after the wedding ends the problem. An amendment that specifically addresses the new spouse, whether to include them, to leave them a limited share, or to exclude them with clear language, eliminates the omitted spouse presumption. The creator’s choice controls, as long as the document says so unambiguously.
For anyone bringing an existing trust into a marriage, the practical steps are short:
- Have an estate planning attorney review the trust soon after the wedding and identify assets likely to develop community interests over time.
- Use a prenuptial or postnuptial waiver, with full disclosure and independent counsel on both sides, if the goal is to preserve the original terms.
- Keep separate property separate. Once marital income pays trust expenses or improves trust property, a community interest attaches and is hard to unwind later.
- Say the quiet part out loud in the document. If the creator does not want the new spouse to inherit, the trust needs explicit language to that effect. Silence is exactly what triggers the statutory share.