Here’s a mistake I see San Mateo County families make almost every quarter, and it can cost heirs six figures. Someone inherits a Peninsula home, the family is grieving, the house needs to be sold, and everyone moves fast, except no one gets a date-of-death appraisal. Months later, a preventable tax surprise lands. If you are a trustee, an heir, or a wills and trusts attorney guiding a client, understanding stepped-up basis for an inherited home in California is the single most valuable thing you can get right before the “for sale” sign goes up. Let me walk through it in plain language, then point you to the professionals who should confirm the specifics.
What Stepped-Up Basis Actually Means
When you inherit a home, your cost basis is generally “stepped up” to the property’s fair market value on the date of the owner’s death, not what they originally paid for it. That single rule is enormous on the Peninsula, where a home bought decades ago for a few hundred thousand dollars may be worth well over $2 million today.
Consider a clearly hypothetical example. A parent buys a Woodside home for $150,000 in 1980. It is worth $950,000 on the date they pass. Because of the stepped-up basis, the heir’s basis becomes $950,000. If they sell soon after for $960,000, the taxable gain is roughly $10,000, not $810,000. The appreciation that built up during the parent’s lifetime is generally not taxed. Skip the documentation, and you can lose the proof that protects that step-up.
Why the Date-of-Death Appraisal Comes First
The date of death appraisal is what establishes and documents that fair market value. It is your evidence if the numbers are ever questioned. Trying to reconstruct a value years later, from memory or a rough guess, is exactly how heirs end up overstating a gain or losing a deduction they were entitled to.
I always tell trustees the same thing: get the appraisal before you list, not after. A date-of-death valuation is a specific, defensible number tied to a specific date. A list price set months later is not a substitute. When the appraisal happens first, the cost basis and the pricing conversation both start from solid ground.
Here’s how I help
I connect trustees and attorneys with qualified appraisers who understand date-of-death valuations on the Peninsula, then I build the pricing strategy around that documented number so the sale and the tax picture line up from week one.
How to Sequence Trustee, Attorney, Agent, and CPA
The smoothest San Mateo County trust home sales I have been part of all share one trait: the professionals coordinate early, ideally 60 to 90 days before listing. Here is the sequence I recommend:
- Attorney confirms the trust or probate authority and who can act.
- Appraiser establishes the date-of-death value for basis and pricing.
- Agent prepares the home, sets a defensible price, and manages the sale.
- CPA or tax advisor confirms the tax treatment for the specific estate.
When those four move in order instead of tripping over each other, the sale is calmer, the pricing holds, and the heirs avoid nasty surprises. When they don’t, I have watched families lose leverage and money that a little sequencing would have protected.
Frequently Asked Questions
Q: What is stepped-up basis on an inherited California home?
It is the reset of your cost basis to the home’s fair market value on the date of death, which generally erases capital gains on the appreciation that occurred during the previous owner’s lifetime.
Q: Do I really need a date-of-death appraisal?
It is the cleanest way to document fair market value. Most executors and trustees use a professional appraisal so the basis is defensible if it is ever questioned.
Q: Does stepped-up basis lower my property taxes too?
No. Stepped-up basis affects capital gains, not property taxes. The county can still reassess the property, which is a separate issue to plan for.
Q: Who should I talk to about the tax details?
Your CPA and estate attorney. This article is general education, not individualized tax or legal advice.
Selling an Inherited Peninsula Home? Let’s Coordinate It Right
Getting the date of death appraisal before you list protects heirs from an avoidable tax and pricing surprise. If you are a trustee, heir, or attorney handling a San Mateo County trust home sale, I am glad to coordinate with your CPA and attorney and help you sequence it correctly. Call me at (650) 576-9565 or book a no-pressure consultation at marktauber.com. You may also want my Peninsula market updates and my home valuation resources on The Mark Tauber Blog.
Sources and further reading
- IRS Publication 551, Basis of Assets — the authoritative federal guidance on stepped-up basis for inherited property.
- California State Board of Equalization: Proposition 19 — how and when an inherited California property is reassessed for property tax.
- San Mateo County Assessor — local assessment records, reassessment rules and exclusion forms.
About the Author:
I’m Mark Tauber, a real estate broker based in Burlingame with 24+ years of Peninsula experience. I rank in the top 9% of Coldwell Banker agents internationally, and I regularly help trustees, heirs, and estate attorneys across San Mateo County coordinate trust and probate property sales. This article is general education, not tax or legal advice. Reach me at (650) 576-9565 or marktauber.com.
