The Full Step Up in Basis: A California Community Property Advantage Most Families Miss

Most conversations about estate taxes focus on a number most California families will never reach. With the federal estate tax exemption now set at $30 million per couple, the vast majority of estates owe no federal estate tax at all. Yet there is a different tax that touches far more families when a spouse passes away and the survivor later sells the home, the rental, or a long-held brokerage account: capital gains tax.

California’s community property system carries a quiet advantage here that many families overlook. It is called the full, or “double,” step up in basis. Understanding it can be the difference between a tax-free sale and a bill for tens or even hundreds of thousands of dollars. This article explains what the step up is, why California treats married couples more favorably than most states, and the planning details that determine whether your family actually captures the benefit.

What “Basis” Means and Why It Matters

Basis is, in simple terms, your investment in an asset for tax purposes. For a home, it usually starts as what you paid, plus the cost of qualifying improvements over the years. When you sell, the IRS taxes the gain, which is the sale price minus your basis. A couple who bought a Fullerton home in 1985 for $150,000 and sells it today for $1.2 million is looking at more than a million dollars of gain on paper.

That is where the step-up rule matters. Under Internal Revenue Code Section 1014, property that passes through someone’s estate at death generally receives a new basis equal to its fair market value on the date of death. The appreciation that built up during the owner’s lifetime is, in effect, erased for income tax purposes. An heir who sells shortly after inheriting often owes little or no capital gains tax, because there is little gain measured from the date-of-death value.

Single Step Up vs. the Full California Step Up

Here is where the state you live in matters. In common law states, which make up most of the country, only the deceased spouse’s half of jointly owned property receives the step up. The surviving spouse’s half keeps its original, lower basis.

Consider a couple in a common law state who bought a property for $200,000 that is now worth $800,000. When one spouse dies, only the decedent’s half steps up to current value. The surviving spouse’s half stays at its old basis. The combined new basis lands around $500,000, so a later sale at $800,000 still leaves roughly $300,000 of taxable gain.

California works differently. As a community property state, it allows both halves of community property to reset to fair market value when the first spouse dies. This is the full step up, sometimes called the double step up, and it rests on Internal Revenue Code Section 1014(b)(6). Run the same numbers in California: the entire property steps up to $800,000, and a sale at that price can produce little to no capital gains tax for the surviving spouse.

For a married couple who has owned an appreciated Orange County home, rental property, or investment account for decades, that distinction is one of the most valuable features of California estate planning, and it costs nothing extra to take advantage of when the asset is properly classified.

What It Takes to Qualify

The full step up applies to community property, so the threshold question is whether an asset is actually classified that way. In general, property a married couple acquires during the marriage with community earnings is community property, while assets owned before the marriage, or received individually by gift or inheritance, are usually separate property. Two practical points come up often:

• Title and documentation matter. An asset can be community property even if it is held in only one spouse’s name, but proving that classification to the IRS is easier when the title and records support it. Many California couples hold real estate as “community property with right of survivorship,” a form of title designed to combine the survivorship feature of joint tenancy with the full step up of community property.
• Joint tenancy is not the same thing. Property held in plain joint tenancy may only receive a step up on the deceased spouse’s half, the same limited result as a common law state. Couples who titled assets as joint tenants years ago sometimes hold a less favorable arrangement than they realize, and reclassifying may be worth discussing.

Revocable living trusts also handle this well. A properly drafted California trust can hold assets as community property, preserving the full step up while also keeping those assets out of probate. The two goals work together rather than against each other.

A Few Important Cautions

The step up is powerful, but it is not unlimited, and a handful of details can change the outcome:

• The one-year gifting rule. Under Section 1014(e), if one spouse gifts appreciated property to the other within a year of that spouse’s death and it passes back to the original donor, the expected step up can be denied. Last-minute transfers between spouses deserve careful review.
• Records still matter for rentals. For rental or investment real estate, depreciation history and the split between land and improvements affect the post-death numbers. Keeping good records after the first death helps the survivor and the family later.
• Separate property follows different rules. Assets that are clearly one spouse’s separate property do not get the community property double step up. Sorting out classification before a death, rather than after, avoids disputes and missed opportunities.

None of this is a do-it-yourself exercise. Classification, titling, and trust funding interact in ways that are specific to each family’s history and assets, and the cost of getting it wrong is measured in real tax dollars.

The Bottom Line

Even families who will never owe a dollar of estate tax can save significantly through thoughtful planning around basis. California’s community property rules give married couples a built-in advantage that many never use simply because they do not know it exists, or because an old title or trust does not capture it. A short review of how your assets are held today can protect that advantage for the spouse who is left behind.

Goodman Estate Law

Brett J. Goodman is the founder and lead attorney at Goodman Estate Law, based in Laguna Hills, CA. The firm specializes in Estate Planning, Trust Administration, and Probate, helping individuals and families create or update wills and trusts. With a focus on personalized, compassionate, and professional guidance, Goodman Estate Law ensures clients’ assets and futures are protected during every stage of estate planning.