California property glossary
Stepped-Up Basis
Also called basis step-up, date-of-death basis, IRC 1014 basis adjustment
Quick answer
Stepped-up basis resets the tax cost of inherited property to its fair market value at the date of the owner's death, which is why heirs who sell soon afterward frequently owe little or no capital gains tax on the sale.
Key facts
- What resets
- The property's tax basis, to fair market value at date of death
- Effect on a sale
- Gain is measured from the new basis, so a prompt sale often produces little taxable gain
- Community property
- Where property was held as community property, the adjustment can apply to the whole rather than one half
- How title was held
- Community property, joint tenancy and tenancy in common can produce different outcomes
- Not related to
- Proposition 19, which governs California property tax rather than income tax
- Establishing value
- Commonly a date-of-death appraisal, obtained near the time rather than reconstructed later
What it means
Basis is what a property is treated as having cost for tax purposes, and capital gain is measured from it. When property passes at death, the basis is generally adjusted to the value on the date of death. A house bought decades ago for a fraction of today's value therefore arrives in the heir's hands with a basis close to current market value, and a sale shortly afterward produces little taxable gain.
California is a community property state, and that matters here. Where property was held as community property, the rule can adjust the basis of the whole property rather than only the deceased spouse's half — a materially different outcome from joint tenancy in some situations. How title was held is therefore not a clerical detail but a tax fact.
The step-up is a federal income tax concept and is entirely separate from Proposition 19, which governs California property tax. The two are routinely confused. One decides what capital gain a sale produces; the other decides what the annual tax bill on the property becomes. An inherited house can carry a favourable basis for income tax purposes and a reassessed, much higher property tax bill at the same time.
Because the step-up is measured at the date of death, the value at that date is worth establishing properly — commonly through a date-of-death appraisal — rather than reconstructing it later from memory. This is a tax matter, not a real estate one, and the figures should be confirmed with a CPA or tax attorney before relying on them.
Why this matters when you are selling
For most families selling an inherited home, this is the rule that makes the sale affordable. A parent who bought in the 1980s may have a basis that bears no relation to current value; without the step-up, selling would surface decades of appreciation as taxable gain. With it, the gain is measured only from the date of death, and a sale within a reasonable period often produces very little.
The corollary is that holding has a cost. Appreciation after the date of death is taxable gain when the property is eventually sold, so an heir who holds a property for years and then sells is in a different position from one who sells promptly. Neither is wrong — but the choice has a tax consequence, and it is worth knowing which way it runs before deciding.
Common mistakes
Assuming the parent's original purchase price still matters.
Instead: After a step-up it generally does not. The relevant figure is value at the date of death.
Never establishing a date-of-death value.
Instead: Get an appraisal near the time. Proving the figure years later, from an estate that has since been distributed, is materially harder.
Treating the step-up as protection against the property tax reassessment.
Instead: They are separate taxes. A step-up does nothing about Proposition 19, and vice versa.
Questions people ask
Do I owe capital gains tax if I sell an inherited house right away?
Often very little, because the basis has been reset to the value at the date of death and the sale price shortly afterward is usually close to it. Gain is measured from the stepped-up basis, not from what the deceased originally paid. Selling costs also reduce the gain. The specific answer depends on the numbers and belongs with a CPA — this is a tax question, and the figures are worth confirming rather than assuming.
Does it matter how my parents held title?
Yes, and in California it can matter a great deal. Property held as community property can receive an adjustment on the whole property when one spouse dies, where other forms of co-ownership may adjust only the deceased owner's share. How title was actually vested is a fact worth checking on the deed rather than assuming.
Bottom line
Stepped-up basis is usually the reason an inherited house can be sold without a large tax bill. Establish the date-of-death value while it is easy to establish, and keep it separate in your mind from Proposition 19, which is a different tax entirely.
Official sources
- IRS — basis of inherited property
The federal guidance on how basis is determined for inherited property.
Written and maintained by Sierra Property Buyers, a direct property buyer working across Northern California. Last reviewed August 2026. This page is general information about how California property transactions work — it is not legal, tax, or financial advice, and the specifics of any situation should be confirmed with an attorney, a CPA, or the relevant agency.
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