California Step-Up in Basis: Both Halves Reset at First Death

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.

This April 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.

Feature	Joint Tenancy	Community Property
Avoids probate	Yes	Depends on planning
Step-up at first death	Half only	Both halves
Tax benefit	Partial	Maximum

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.

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.

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.

Sources:

Internal Revenue Code Section 1014 (Basis of Property Acquired from a Decedent)
Internal Revenue Code Section 1014(b)(6) (Community Property)
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.