When you inherit a home in California and sell it shortly after, you might assume there's a big capital gains tax bill waiting. After all, your parents bought the house in 1985 for $175,000, and now it's worth $950,000. That's a $775,000 gain, right? Not necessarily — and this is where the step-up in basis, one of the most powerful tax provisions in the Internal Revenue Code, changes the math entirely. For many California heirs, selling an inherited property shortly after the date of death means paying zero federal capital gains tax. Here's how it works and why it matters for your probate sale.
What Is the Step-Up in Basis?
Under IRS rules (IRC Section 1014), when you inherit property, your "basis" — the original purchase price used to calculate capital gains — is adjusted to the property's fair market value on the date of death. All the appreciation that happened during the decedent's lifetime is effectively erased for tax purposes.
Here's the math in plain terms:
| Scenario | Decedent's Purchase Price | Value at Death | Heir Sells For | Taxable Gain |
|---|---|---|---|---|
| Without step-up | $175,000 | $950,000 | $950,000 | $775,000 |
| With step-up | $175,000 | $950,000 | $950,000 | $0 |
| With step-up, sells later | $175,000 | $950,000 | $1,050,000 | $100,000 |
If you sell the property soon after inheriting — while the market value is still close to the date-of-death value — your taxable gain is near zero. The only tax you owe is on any appreciation that occurs after the date of death. This is why selling promptly through probate is often the most tax-efficient strategy.
California's Double Step-Up: The Community Property Advantage
California goes even further than most states. Because California is a community property state, when one spouse dies, both halves of community property receive a stepped-up basis — not just the deceased spouse's half. This is called the double step-up, and it's one of the most valuable tax benefits of holding property as community property in California.
Compare this with a separate-property state where only the deceased spouse's 50% share gets stepped up:
- Separate property state: A couple bought a San Diego home for $200,000. It's now worth $1,200,000. One spouse dies. The surviving spouse's basis: $100,000 (their half of the original $200,000) + $600,000 (stepped-up half) = $700,000. Selling for $1,200,000 = $500,000 taxable gain. At 20% federal + 13.3% California = roughly $166,500 in combined tax.
- California community property: Same scenario. Both halves step up to $600,000 each. Total basis: $1,200,000. Sell for $1,200,000 = $0 taxable gain. $0 tax.
That's a six-figure difference from one state's property classification. For surviving spouses in San Diego County — where median home values exceed $900,000 — the double step-up can be worth more than $150,000 in tax savings on a single property.
Most heirs we work with at SoCal Probate Homes are pleasantly surprised to learn they won't owe capital gains tax on the inherited property they're selling through probate. The step-up in basis is automatic under federal law — you don't need to file anything special to claim it. But you do need to document the date-of-death value, which is where a probate appraisal or formal valuation becomes essential.
What Qualifies for the Step-Up
Not every inherited asset gets the step-up treatment. Here's what qualifies — and what doesn't — in a typical California probate:
- Real property owned by the decedent. The family home, rental properties, vacant land — all receive a step-up to fair market value at death. This includes properties held solely in the decedent's name as well as community property.
- Community property with right of survivorship. Still gets the double step-up. This is a common title form in California that avoids probate while preserving the community property tax treatment.
- Joint tenancy (not community property). Only the decedent's share receives the step-up. Many California couples hold property as joint tenants simply because that was the default on their deed form — and they miss out on the double step-up entirely. This is correctable by recording a new deed during life, but not after death.
- Trust assets. Property held in a revocable living trust still receives the step-up because the decedent retained control. Irrevocable trusts are more complex — consult a tax professional.
What to Do Before Selling: Document the Date-of-Death Value
The step-up is automatic, but the IRS may want proof of the date-of-death value if you're audited. A formal probate appraisal — the same one used for the court inventory — serves double duty as documentation. Here's what to keep:
- A certified real estate appraisal dated as close to the date of death as possible.
- Comparable sales data from the quarter when death occurred.
- The probate inventory and appraisal (Form DE-160 in California), which lists the property at its date-of-death value.
- Closing statements showing the final sale price, to demonstrate whether any additional gain occurred after the date of death.
Two California-specific pitfalls to watch for: first, the step-up applies to federal capital gains — it does not affect California property tax reassessment under Proposition 19, which is a completely separate calculation. Second, if the property sits in probate for over a year and appreciates significantly (common in a hot San Diego market), the appreciation above the date-of-death value is taxable. This is another reason to move the sale forward without unnecessary delays.
The Takeaway for Heirs in California Probate
The step-up in basis is one of the most underappreciated benefits of inheriting property. Combined with California's community property double step-up, it means most heirs who sell through probate quickly will owe little to no capital gains tax — even on properties that appreciated by hundreds of thousands of dollars over decades of ownership. The key is selling before additional market appreciation builds a new taxable gain, and keeping solid documentation of the date-of-death value.
This is general information, not tax or legal advice. The step-up in basis rules under IRC Section 1014, California community property law, and the interaction with Proposition 19 are complex and depend on your specific circumstances. Consult a qualified California tax professional or probate attorney before making decisions about selling inherited property.