Understanding Community Property Estate Planning in California

Quick answer: California is a community property state, meaning most assets a married couple acquires during marriage are owned 50/50 by law. That has real consequences for estate planning — especially the tax benefit called the “double step-up in basis,” which lets a surviving spouse potentially sell appreciated property with zero capital gains tax.

If you own a house in Ventura County that has climbed in value over 20 years, the difference between holding it as community property and holding it as joint tenancy or separate property could mean tens of thousands of dollars in capital gains taxes — or none at all. The rules are set by California Family Code § 760 and Internal Revenue Code § 1014(b)(6), not guesswork. Getting this right starts with understanding the basics.

What Community Property Actually Means

California Family Code § 760 says that all property acquired by a married person while domiciled in California is community property — unless a specific exception applies. That presumption is broad. It covers wages, business income, real estate purchased during marriage, retirement account contributions, and most investment accounts funded after the wedding date.

The flip side is separate property: assets you owned before marriage, or received during marriage as a gift or inheritance. Separate property belongs to the individual spouse alone. It does not get split at divorce, and it passes however you direct in your estate plan (or under California intestacy law if you have no plan).

The distinction sounds simple. In practice, it gets complicated fast. If you use separate property funds to pay down a community property mortgage, you may have a claim for reimbursement under Family Code § 2640. If you deposit a separate property inheritance into a joint account and mix it with community earnings over years, the inherited funds can become very hard to trace. Courts call that “commingling” — and it frequently turns separate property into community property by default.

What Is and Is Not Community Property

A quick breakdown of how California typically classifies common assets:

• Community property: salaries and wages earned during marriage, property bought with those earnings, retirement plan contributions made during marriage, business income earned during marriage
• Separate property: assets owned before marriage, inheritances (even if received during marriage), gifts to one spouse, and the proceeds from selling separate property (if traceable)
• Gray zone: property bought partly with separate funds and partly with community funds; separate property that has been commingled with community funds; appreciation on separate property (can go either way depending on how it arose)

If you are uncertain how a specific asset is classified, that uncertainty itself is worth resolving in your estate plan. An ambiguous asset is a dispute waiting to happen.

The Double Step-Up in Basis: Why It Matters

This is the benefit most California couples do not know about — or do not know they might be giving up.

Under Internal Revenue Code § 1014(b)(6), when one spouse dies, both halves of community property receive a new cost basis equal to fair market value at the date of death. Both halves — not just the deceased spouse’s half.

Compare that to property held as joint tenancy. In joint tenancy, only the decedent’s half gets the step-up. The surviving spouse’s half keeps its original cost basis.

Here is a concrete example: You and your spouse bought a Ventura County home in 2005 for $400,000. At your death in 2026, it is worth $1,200,000. The gain is $800,000.

• If held as community property: Both halves step up to $1,200,000. Cost basis for the surviving spouse is now $1,200,000. Sale results in zero federal capital gains tax.
• If held as joint tenancy: Only the deceased spouse’s half steps up. The surviving spouse’s half keeps its original $200,000 basis. Taxable gain on a sale: $400,000.

The difference in taxes owed can exceed $80,000 on a sale, depending on the capital gains rate and whether California’s 13.3% top rate applies.

Important caveat: IRAs and 401(k)s do not receive any step-up in basis, regardless of community or separate property status. Those accounts contain pre-tax dollars and are taxed as ordinary income on distribution.

Community Property and Your Estate Plan

California’s community property rules interact with every major estate planning tool — trusts, wills, beneficiary designations, and titling decisions. A few areas that trip people up:

Revocable Living Trusts

Most Ventura County families with real estate use a revocable living trust to avoid probate. When you transfer community property into a trust, the community property character should be preserved — but how the trust is drafted matters. A poorly drafted trust, or one that does not specify the community property status of transferred assets, can inadvertently change the character of assets and cost the surviving spouse the double step-up. Always confirm with your attorney that the trust language preserves community property character.

Beneficiary Designations

Retirement accounts and life insurance pass by beneficiary designation, not through your will or trust. Community property rules still apply to the underlying value of a retirement account accumulated during marriage. Under California Probate Code § 21610 et seq., a surviving spouse has rights to community property even if they are not the named beneficiary. This is an area where outdated beneficiary forms create serious problems.

Separate Property Planning

If you received an inheritance or owned property before marriage, your estate plan should explicitly address it as separate property. If you want to leave separate property to children from a prior relationship rather than to your current spouse, that requires careful drafting — California’s community property rights are strong, and a generic will or trust may not accomplish what you intend.

Transmutation Agreements

Spouses can change the character of property — community to separate, or separate to community — through a written agreement called a transmutation (Family Code § 850). You might do this to preserve the double step-up on appreciated separate property, or to convert community property to separate property for estate planning purposes. Transmutations must be in writing and signed, and they need to be done correctly or they do not hold up.

Practical Steps for Ventura County Couples

A few concrete things to address in your estate plan:

• Inventory your assets with their acquisition dates and sources. Know which are community property and which are separate property before you sit down with an attorney. This saves time and prevents misclassification.
• Review how your real estate is titled. Joint tenancy and community property are not the same, and the titling on the deed controls for step-up purposes. Many couples are surprised to find their home is titled in joint tenancy rather than as community property — or as community property with right of survivorship, which is usually optimal.
• Check beneficiary designations on retirement accounts and life insurance. Outdated forms are among the most common causes of unintended disinheritance.
• Do not commingle separate property if you can avoid it. Keep inherited funds in a separate account. Document the source.
• Update your plan after major life changes. Remarriage, inheritance, purchase of a new home, or a significant change in asset values all warrant a review.

Frequently Asked Questions

Does my spouse automatically inherit my half of community property if I die without a will?

Yes. Under California Probate Code § 6401, a surviving spouse inherits the deceased spouse’s half of community property if there is no will directing otherwise. So the surviving spouse ends up with 100% of community property. Separate property, however, follows different intestacy rules — it may be split between the surviving spouse and children, depending on how many children there are.

Can we hold property as both community property and avoid probate?

Yes. California recognizes “community property with right of survivorship” as a title option (Probate Code § 682.1). This gives you the double step-up in basis at the first death and passes the property directly to the surviving spouse without probate. It is generally the preferred way to hold real estate for married California couples, though a trust may still be warranted for more complex situations.

What happens to community property if we divorce?

Community property is divided equally at divorce under Family Code § 2550. Each spouse keeps their separate property. Disputes often arise over what is community versus separate, especially with mixed or commingled assets. Clear documentation from the start makes this much cleaner.

Does a prenuptial agreement override community property rules?

It can. A valid prenuptial agreement can change how assets are characterized during the marriage and at death. Prenups must meet specific requirements under California Family Code §§ 1600-1617 to be enforceable — both parties need independent legal counsel, full financial disclosure, and adequate time to review before signing.

Have questions about how California’s community property rules apply to your specific assets? Ridley Law has helped Ventura County families with estate planning since 2010. Call (805) 244-5291 or schedule a free consultation to get a clear picture of where you stand.