Community property is one of the most misunderstood concepts in California estate planning, and getting it wrong can quietly unravel a carefully written will or trust. People often assume they can leave whatever they own to whomever they choose, but for married Californians that assumption is only half right, sometimes literally. Understanding this rule is the key to knowing what you can actually put into your will or trust, and what already belongs to someone else. What follows is a brief overview of community property, which is the rule of the land in California.
In General
California Family Code section 760 defines community property as, 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. In plain terms, most of what a married couple acquires while living in California belongs to both spouses equally, each holding an undivided one-half interest, no matter whose name appears on the title or the paycheck.
The mirror image is separate property. Under Family Code section 770, separate property includes everything a spouse owned before the marriage, anything received during the marriage by gift or inheritance, and the rents, issues, and profits flowing from those separate assets. A spouse may generally deal with their own separate property freely, but jointly owned marital assets are a different matter entirely.
Why Community Property Controls Your Will or Trust
Here is the point that surprises most people: you cannot give away in your will or trust something you only half own. Because community property belongs equally to both spouses, a married person can only dispose of their own one-half interest at death. The surviving spouse already owns the other half outright.
So when someone writes “I leave the family home to my children,” but the home is community property, that instruction reaches only the deceased spouse’s half. The surviving spouse keeps their half regardless of what the will says. A plan that ignores this can produce exactly the disputes, clouded title, and litigation that a will or trust is supposed to prevent.
This is why estate planning and marital property must be understood together. Knowing whether an asset is community or separate tells you how much of it you can actually leave to your chosen beneficiaries.
Commingling and Transmutation
Two concepts frequently blur the line between community and separate property. The first is commingling. When separate property is mixed together with marital assets, for example by depositing an inheritance into a joint account and spending it on household expenses, the separate character can be lost, and the asset may be treated as jointly owned. That can pull an asset you intended to leave to specific heirs back into the shared marital estate.
The second is transmutation — the deliberate changing of an asset’s character from separate to community, or the reverse. California does not allow this to happen on a handshake. Under Family Code section 852, a transmutation of real or personal property is not valid unless made in writing by an express declaration that is joined in, consented to, or accepted by the spouse whose interest is adversely affected. Anyone who believes they converted separate property into community property, or the reverse, by informal agreement is often mistaken, and that mistake can surface only after death.
What Happens at Death
These rules drive what actually passes under a will or trust. The surviving spouse automatically keeps their own one-half interest. The deceased spouse’s one-half passes according to their will or trust, or, if there is no estate plan at all, under California’s intestate succession rules in Probate Code section 6401, which generally direct the deceased spouse’s share of community property to the surviving spouse.
This is why a will or trust should be drafted around the community property interest, not in spite of it. A properly prepared estate plan identifies which assets are community and which are separate, so the document disposes of exactly what the person actually owns and no more.
Practical Steps for Your Estate Plan
A few habits keep a will or trust from failing. Confirm whether each significant asset is community or separate property before you decide who gets it. Coordinate any transfer of community real estate with your spouse, whose consent is generally required. Avoid commingling separate assets you intend to keep separate, and put any transmutation in a proper written agreement. Above all, work with a qualified estate-planning attorney, because this area of law is full of presumptions and exceptions that a general overview like this one cannot fully capture.
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Disclaimer: Every situation is different and particular facts may vary thereby changing or altering a possible course of action or conclusion. The information contained herein is intended to be general in nature as laws vary between federal, state, counties, and municipalities and therefore may not apply to any given matter. This information is not intended to be legal advice or relied upon as a legal opinion, course of action, accounting, tax or other professional service.
