Community Property Tracer

What This Tool Does

Enter your marriage date and add each significant asset you or your spouse own. The tracer classifies each one as community property, separate property, or mixed under California law, explains why, and flags anything that needs a closer look before you build your estate plan.

What Community Property Actually Means

California is a community property state. As a general rule, anything either spouse earns or acquires during marriage belongs equally to both spouses, no matter whose name is on the title or whose paycheck bought it (Cal. Fam. Code § 760). Anything owned before marriage, or received during marriage as a gift or inheritance, stays that spouse's separate property (Cal. Fam. Code § 770).

Titling doesn't control the outcome the way people assume it does. A house bought during marriage and put in one spouse's name alone is still presumptively community property. A house owned before marriage and later added to both spouses' names raises a different question: whether that retitling was meant to change its character, called a transmutation, which California requires to be in writing (Cal. Fam. Code § 852).

Why the Classification Matters for Estate Planning

This isn't just a labeling exercise. It drives the single biggest capital gains number in most California estate plans: the stepped-up basis.

When one spouse dies, community property gets a full step-up in basis on both halves, not just the half the decedent owned (IRC § 1014(b)(6)). Separate property only steps up on the decedent's share; the surviving spouse's share keeps its original, often much lower, basis. For an asset that has appreciated significantly, such as a home bought decades ago or a long-held brokerage account, that difference can mean tens or hundreds of thousands of dollars in capital gains tax if the survivor later sells.

Getting the classification right, and documenting it, before the first spouse dies is one of the most valuable things a California married couple can do in their estate plan.

Common Mistakes That Blur the Line

• Commingling. Depositing an inheritance into a joint checking account, then paying bills and making purchases out of that account for years, can turn traceable separate property into community property. Once separate and community funds are mixed to the point they can no longer be traced, California courts presume the whole thing is community.
• Accidental transmutation. Retitling a separate property asset into joint names, often for refinancing or convenience, can convert it to community property without either spouse intending that result. Cal. Fam. Code § 852 requires a written, express declaration to change an asset's character, but the retitling itself is often the first evidence a court looks at.
• Assuming retirement accounts are simple. A 401(k) or pension that started before marriage and kept growing during marriage is mixed. The pre-marriage balance is separate; the contributions and growth during marriage are community, under the formula set out in In re Marriage of Brown.
• Treating a business the same way. A business started before marriage but grown through a spouse's labor during marriage raises the same mixed-asset problem, and apportioning the separate and community shares (Pereira or Van Camp analysis) is not something to guess at.
• No paper trail. Even when an asset should legally be separate property, without records showing the source of funds and how the asset was maintained, a spouse (or a court, in a later dispute) has nothing to rely on but the community property presumption.

How to Fix a Classification Problem

If this tool flags an asset as mixed or uncertain, you generally have a few options, and the right one depends on what you and your spouse actually want the outcome to be:

• Forensic tracing. A forensic accountant can reconstruct the separate and community portions of an asset from bank records, account statements, and purchase documents, even years later. This is the only way to overcome a commingling presumption with evidence rather than a guess.
• A transmutation agreement. If you and your spouse agree an asset should be characterized a certain way, whether that means confirming it stays separate or intentionally converting it to community property, a written transmutation agreement that meets Cal. Fam. Code § 852's requirements settles the question going forward.
• A postnuptial or property agreement. For a broader reset across multiple assets, a written agreement between spouses can characterize property comprehensively rather than asset by asset.
• Titling review during trust funding. When you fund a living trust, that's the natural checkpoint to confirm each asset's character is documented correctly, since a trust doesn't fix a classification problem on its own; it just holds whatever the asset already is.

None of this needs to happen this week. It needs to happen before it's the surviving spouse's problem to sort out alone, with an accountant, a stale paper trail, and no one left to ask.

Related Resources

• Living trust services at Ridley Law
• Estate planning overview
• Trust Funding Tracker, for getting assets titled correctly into your trust