Selling an inherited house: the tax questions to ask your CPA before you list

Heirs tend to arrive at the tax question with the wrong fear: that selling the family home will trigger a devastating capital-gains bill on fifty years of appreciation. Usually it won’t — the stepped-up basis exists precisely to prevent that. But “usually” is carrying weight in that sentence, and the exceptions are decided by documents, dates, and state law. This guide orients you and arms you for the conversation that actually matters: the one with your CPA.

The orientation, in plain English

The step-up is the headline. For most inherited property, the cost basis resets to fair market value at the owner’s death. If Mom bought the house for $60,000 and it was worth $1.4M when she died, the taxable-gain clock generally restarts at $1.4M — not $60,000. Sell soon after, near that value, and the gain (and often the tax) can be modest.

Time and titling are the fine print. Every month between death and sale, appreciation accrues on top of that stepped-up number. And how the property was held — trust, joint tenancy, community property — shapes how the step-up applies. These aren’t edge cases; they’re the ordinary questions a preparer resolves from the actual documents.

California adds a property-tax layer. Proposition 19 (in effect since 2021) means most inherited California homes are reassessed to market value for property taxes unless an heir promptly makes it their primary residence and claims the narrowed exclusion. For a family debating “keep it and rent it” versus “sell it,” the post-Prop-19 property-tax bill belongs in that math from day one.

Rentals complicate; disclose early. Any rental history — before or after death — brings depreciation and use questions into the analysis. Tell the CPA at the first meeting.

The five questions to bring to your CPA

1. “Given how the property was titled, what is our basis — and does the full property step up, or only part?”
2. “What documentation do you need from us — and should we commission a date-of-death appraisal now?” (The answer to the second half is almost always yes.)
3. “Does the timing of the sale change the outcome — and is there a window that helps us?”
4. “The property was/wasn’t rented — what does that history do to the analysis?”
5. “For California property: what does Prop 19 do to the property taxes if we keep it, and does that change your recommendation?”

A CPA with those five questions and the documents — trust, deed, appraisal — can usually give an estate clarity in one meeting. Without them, everyone guesses expensively.

Where the agent fits — and doesn’t

Your listing agent should not be your tax advisor, and an agent who plays one is a red flag. What the right agent does is coordinate: support the date-of-death valuation with real comparable data, time preparation and listing with the tax picture in view, keep the paper trail clean for the preparer and the heirs, and — in a trust or probate sale — run the documented, court-conscious process that lets a fiduciary show their work. Vetting for that estate fluency, with a written comparison a co-beneficiary can read, is what we do for estates; the tax chair at the table belongs to your CPA.

Questions people ask

What is the stepped-up basis, in one breath?

When you inherit property, your cost basis for capital-gains purposes generally becomes its fair market value at the previous owner's death — not what they paid decades ago. Sell near that value soon after, and the taxable gain is often small. Sell years later after appreciation, and the gain since death is what's in play. The step-up's exact application depends on titling and trust structure — which is question one for the CPA, not a thing to assume.

Why does everyone insist on a date-of-death appraisal?

Because the stepped-up basis is only as defensible as the valuation behind it. A professional appraisal pegged to the date of death documents the number the entire tax outcome rests on. Getting one promptly — while the market context is fresh — is cheap insurance; reconstructing one years later is neither.

Does it matter that the house was in a trust, or owned jointly?

Enormously, and this is exactly where lay summaries fail. Community-property treatment, joint tenancy, and various trust structures produce different basis outcomes — including, in some cases, how much of the property steps up. Bring the trust document and the deed to the CPA; the answer lives in those papers, not in a general rule.

We're in California — what does Proposition 19 change?

Prop 19 is about property taxes, not capital gains: since 2021 it sharply narrowed the parent-child exclusion, so an inherited California home is generally reassessed to market value unless a child moves in as their primary residence and claims the exclusion within the deadline — and even then a value cap applies. If no heir will occupy the home, expect reassessment — which raises the carrying cost of holding it and often strengthens the case for an orderly, well-prepared sale over a long hold. Confirm specifics with the county assessor and your advisor.

Was the home ever a rental? Why does the CPA keep asking?

Because depreciation taken (or takeable) during rental years has its own tax treatment at sale, and because post-inheritance rental use changes the analysis of any exclusions. If the property earned rent at any point — under the decedent or under the estate — say so early. Surprises here are the expensive kind.