California Double Step-Up in Basis When a Spouse Dies

California's community property status provides one of the most valuable tax advantages in estate planning: the double step-up in basis. When one spouse dies, both halves of community property receive a stepped-up basis, potentially eliminating hundreds of thousands of dollars in capital gains taxes.

Read the statute yourself: 26 U.S.C. § 1014, "Basis of property acquired from a decedent". Subsection (b)(6) is the sentence that does the work. It treats as acquired from the decedent, for decedents dying after December 31, 1947:

property which represents the surviving spouse's one-half share of community property held by the decedent and the surviving spouse under the community property laws of any State ... if at least one-half of the whole of the community interest in such property was includible in determining the value of the decedent's gross estate under chapter 11 of subtitle B

Because the surviving spouse's own half counts as acquired from the decedent, it is revalued under Section 1014(a) alongside the decedent's half. That is the whole mechanism behind the phrase "double step-up".

This August 2026 update tracks the current federal basis rules in IRC Section 1014, IRS Publication 551, and the community-property guidance referenced in IRS Publication 555. It also reflects the practical California title issues families run into with community property probate, revocable living trusts, and Proposition 19 inherited property rules.

What Is Step-Up in Basis?

When you sell property, you pay capital gains tax on the profit. Your "basis" is what you paid for the property. The gain is the difference between sales price and basis.

Example without step-up:

• Bought stock for $50,000
• Sold for $300,000
• Capital gain: $250,000
• Tax at 20%: $50,000

When you inherit property, the basis "steps up" to fair market value at death. All that appreciation during the decedent's lifetime is never taxed.

Example with step-up:

• Decedent bought stock for $50,000
• Worth $300,000 at death
• Heir's stepped-up basis: $300,000
• Heir sells for $300,000
• Capital gain: $0
• Tax: $0

California Step-Up in Basis Rules

In most states, when one spouse dies, only the deceased spouse's share of jointly owned property gets a step-up. The surviving spouse's share keeps its original basis.

California is different. Because it is a community property state, both halves of community property receive a stepped-up basis when either spouse dies.

This is the "double step-up."

Community Property With Right of Survivorship

Many California couples hold title as community property with right of survivorship. That title still preserves the community-property tax treatment while also avoiding a separate probate administration at the first death, which is one reason deed language matters so much.

Full Step-Up in Basis at the First Spouse's Death

The high-value California question is whether community property gets a full step-up in basis at the first spouse's death. In general, yes. When appreciated property is truly community property, both halves reset to fair market value at the first death under IRC Section 1014(b)(6), not just the decedent's half.

When Does Tax Basis Reset for Rental Property in California?

For California rental property that is community property, the basis adjustment generally happens on the date of death of the first spouse. That means the surviving spouse typically starts from the date-of-death fair market value rather than the couple's old purchase price when calculating later gain. Rental property still needs careful post-death records because depreciation history, land-versus-improvements allocation, and later capital improvements all affect the final tax reporting.

How Much Does It Save?

Typical Scenario

John and Mary bought their California home in 1990 for $200,000. It is now worth $1,400,000. John dies in 2025.

In a Separate Property State:

• Mary's half: Original basis $100,000
• John's half: Steps up to $700,000
• Mary's total basis: $800,000
• If Mary sells for $1,400,000: $600,000 gain
• Federal tax (20%): $120,000
• California tax (13.3%): $79,800
• Total tax: $199,800

In California (Community Property):

• Mary's half: Steps up to $700,000
• John's half: Steps up to $700,000
• Mary's total basis: $1,400,000
• If Mary sells for $1,400,000: $0 gain
• Total tax: $0

Savings: $199,800

What Property Qualifies

Community Property

Property acquired during marriage with community funds:

• Primary residence
• Investment properties bought during marriage
• Stocks purchased during marriage
• Retirement benefits earned during marriage
• Business interests developed during marriage

Quasi-Community Property

Property that would have been community property if acquired in California, but was acquired while living in another state. If you moved to California from Texas, assets acquired during your Texas marriage get the double step-up.

What Does NOT Qualify

Separate property (owned before marriage or received as gift/inheritance) receives only a single step-up on the deceased spouse's share.

Joint tenancy (not community property) receives only a single step-up. This is why proper titling matters.

Joint Tenancy vs. Community Property

Many California couples hold property as "joint tenants" because that is what was on the deed form. This costs them the double step-up.

Converting to Community Property

You can change ownership from joint tenancy to community property (or community property with right of survivorship) by recording a new deed. This preserves the double step-up benefit.

Do this before the first death. After death, it is too late.

Documentation Requirements

To claim the double step-up, maintain records showing:

Community Property Character

• Marriage certificate
• Date of acquisition
• Source of funds
• Property deed showing ownership

Fair Market Value at Death

• Real estate appraisal
• Brokerage statements
• Probate inventory values

Keep these records indefinitely. You may need them years later when selling.

Planning Considerations

Review Property Titles

Check how your property is titled. If it says "joint tenants" instead of "community property," consider changing it. For real-world probate consequences, compare our guides on California community property probate and California surviving spouse rights.

Document Everything

Keep records of when property was acquired and with what funds. This establishes community property character. If the asset is held in a trust, make sure the trust schedule and deed history still show that the property is community property rather than separate property.

Do Not Sell Appreciated Property Before Death

If property has appreciated significantly, the step-up at death eliminates the gain. Selling before death triggers tax.

Sell Depreciated Property Before Death

If property has lost value, selling before death realizes the loss for tax purposes. At death, the loss disappears.

Interaction with Proposition 19

The income tax step-up is separate from property taxes. Proposition 19 may cause property tax increases on inherited property even though the income tax basis steps up.

For income taxes: The step-up remains valuable. For property taxes: Reassessment may occur depending on Prop 19 rules.

Read our California Proposition 19 guide if the property is a home you plan to keep rather than sell.

Selling the Home After a Spouse Dies: The Two-Year Window

If you plan to sell rather than keep, a federal deadline runs alongside the step-up. Internal Revenue Code Section 121(b)(4) lets an unmarried surviving spouse claim the $500,000 joint home-sale exclusion on a sale that happens no later than two years after the date of death. Sell after that window closes, or remarry before the sale, and the exclusion drops to the $250,000 single-filer amount under Section 121(b)(1).

Two conditions attach. You must be unmarried at the time of the sale, and the couple must have met the ownership and use tests of Section 121(b)(2)(A) immediately before the death.

When the Window Matters in California

For most California couples the double step-up has already erased the gain, so the exclusion never gets used. The deadline earns attention in three situations.

The home keeps appreciating after the death. The step-up resets basis to the date-of-death value. Any growth after that date is ordinary capital gain, and the exclusion is what shelters it. A home that rises another $300,000 over three years produces a taxable gain that the step-up does nothing about.

The home was never community property. A house held in joint tenancy that was never converted steps up on the decedent's half only, as the joint tenancy comparison above explains. That leaves real gain on the survivor's half, and the size of the exclusion decides how much of it is taxed.

The survivor waits. The two-year clock is what turns a $500,000 shield into a $250,000 one. Selling in month 30 rather than month 22 can move $250,000 of gain from excluded to taxable.

Date the sale against the death certificate, not against the close of probate. The clock in Section 121(b)(4) runs from the date of death.

Step-Down Warning

The step-up works both ways. If property has declined in value, the basis steps down to the lower value.

Example:

• Stock bought for $100,000
• Worth $40,000 at death
• Heir's basis: $40,000

The $60,000 loss is gone forever. If the decedent had sold before death, the loss could have been used for tax purposes.

Frequently Asked Questions

What is the double step-up in basis?

In California, both halves of community property receive a stepped-up basis when either spouse dies. This means 100% of the property's basis resets to fair market value, potentially eliminating all capital gains taxes.

Does California have a double step-up?

Yes. California is a community property state, and under IRC Section 1014(b)(6), both halves of community property receive a stepped-up basis at the first spouse's death.

Does joint tenancy get the double step-up?

No. Joint tenancy property receives only a single step-up on the deceased owner's share. To get the double step-up, property must be held as community property.

How do I document the step-up?

Keep records showing: (1) the property was community property, (2) the date of death, and (3) fair market value at death. An appraisal or probate inventory provides value documentation.

Does the step-up apply to retirement accounts?

No. IRAs and 401(k)s do not receive a step-up because they contain pre-tax dollars. Distributions are taxed as ordinary income.

Does community property with right of survivorship still get the California step-up in basis?

Generally, yes. The tax result follows the community-property character of the asset, which is why many California couples retitle appreciated property as community property with right of survivorship rather than ordinary joint tenancy.

Can a surviving spouse still get the $500,000 home-sale exclusion in California?

Yes, if the sale happens no later than two years after the date of death and the survivor is unmarried at the time of sale. IRC Section 121(b)(4) preserves the $500,000 joint exclusion for that window, after which it drops to the $250,000 single-filer amount. In most California community property cases the double step-up has already erased the gain, so the exclusion matters most for appreciation after the date of death or for property that was never community property.

Does rental property get a full step-up in basis in California?

It can if the rental property was community property. The key questions are when and how the property was acquired, whether it kept its community-property character, and what the fair market value was on the spouse's date of death.

Related Guides

• California Step-Up in Basis Guide
• California Community Property Probate
• Proposition 19 and Inherited Property
• California Revocable Living Trust
• California Surviving Spouse Rights
• California Statutory Probate Fees Explained -- How the statutory fee schedule based on gross estate value interacts with stepped-up asset values when the estate goes through probate

Sources:

• Internal Revenue Code Section 1014 (Basis of Property Acquired from a Decedent)
• Internal Revenue Code Section 1014(b)(6) (Community Property)
• 26 U.S.C. § 121, "Exclusion of gain from sale of principal residence" (subsection (b)(4), surviving spouse). Publisher: Legal Information Institute, Cornell Law School. Accessed September 1, 2026.
• IRS Publication 551, Basis of Assets
• IRS Publication 555, Community Property

This guide provides general information about the step-up in basis. Tax rules are complex. Consult with a tax professional for advice specific to your situation.