Fair Market Value at Date of Death: What the Definition Requires

Fair market value at date of death is the price a house would have changed hands for on the day the owner died, between a willing buyer and a willing seller, neither under any compulsion to buy or sell and both with reasonable knowledge of the relevant facts. That wording comes from the federal estate tax regulations, and IRS Publication 551 uses the same idea for the basis of inherited property. An appraisal that answers the question has to respect every clause: a hypothetical buyer and seller, no pressure on either, what the market knew then, and one fixed date.

This article reads the definition one clause at a time and shows what each clause does to a Claremont appraisal. It belongs to the estate and date-of-death knowledge center; the pillar, date-of-death appraisals explained plainly, covers the wider assignment.

Where the definition comes from

Fair market value, the willing-buyer, willing-seller price described above, is set out for estate tax purposes in Treasury Regulation section 20.2031-1(b). The same regulation says that value is not determined by a forced sale price. IRS Publication 551 defines fair market value for basis in the same terms and says the basis of property inherited from a decedent is generally its fair market value at the date of death. That is the link between the appraisal and stepped-up basis, the general rule that an heir's basis resets to fair market value at the date of death.

USPAP, the Uniform Standards of Professional Appraisal Practice, requires a report to state the type of value and its definition, with the source. So a date-of-death report names fair market value, quotes or cites the definition, and applies that test. Lending assignments use a market value definition with its own list of conditions about financing and exposure; an estate report says plainly which definition it applies, so the CPA and the attorney know which test was run.

Reading the definition one clause at a time

A willing buyer and a willing seller

Both are hypothetical. The seller is not the heirs, with their attachment to the house or their wish to finish quickly, and the buyer is not whoever eventually bought it. The question is what a typical buyer for this kind of house, in this pocket, would have paid a typical seller. A price agreed between siblings, or a figure the family settled on, does not answer it.

Neither under any compulsion

The value assumes no one had to act. An estate that later sold quickly to close an account, or a house sold as-is to the first offer, may have brought a price shaped by that pressure. The regulation says fair market value is not a forced sale price, so the appraisal values the house as though it had been offered to the market in the ordinary way on the date of death.

Reasonable knowledge of the relevant facts

The hypothetical buyer knows what a careful buyer would have learned then: the age of the roof, a garage converted without a permit, a steep driveway, a dated kitchen, and the sales that had closed nearby. Defects count. So does good news that was knowable, such as a recent permitted addition. What the buyer cannot know is anything that happened afterward.

On the date of death

The date of death, the day the owner died, becomes the effective date, the date the opinion of value applies to. That makes the assignment a retrospective appraisal, an appraisal whose effective date is in the past. Comparable sales are those that closed on or before that day, and market conditions are read from that period. The report also carries a date of report, the day it is signed, which is a different date and does not move the value.

The property as it was

The house is valued in its condition on the date of death. If the heirs have since painted, replaced flooring or cleared out decades of belongings, the appraiser works back to the earlier condition from photographs, permits and invoices. Where a fact cannot be confirmed, the report may rest on an extraordinary assumption, an assumption about uncertain facts that, if false, could change the result, and it says so in plain words.

What the definition rules out

• The later sale price. It shows what the house brought on a later date, often after repairs, and in a different market.
• The county's assessed value, which is not an appraisal. It is a taxable value under California's assessment rules, not a market value opinion.
• An automated estimate, such as a Zestimate, which is not an appraisal. It is a statistical estimate from records, made without seeing the house.
• An agent's CMA, a comparative market analysis, which is not an appraisal. It is an opinion of a likely list or sale price.
• A cash offer, which is not an appraisal. It is one buyer's price on that buyer's terms.

Each of those can be a useful fact. None of them applies the definition. The appraisal vs. estimate page compares them in one table.

How the clauses play out in Claremont

These are the kinds of assignments that come in, described without names, addresses or figures.

• A Craftsman near the Village and the Colleges whose porch was enclosed decades ago. The reasonable-knowledge buyer would have measured the house, not trusted the public record, so gross living area, the finished above-grade living space, is measured, and the enclosed porch is treated as the market treats such space.
• A postwar ranch north of Foothill Boulevard with a garage converted to a family room. Whether the conversion was permitted is a fact a careful buyer would have checked, and the permit file answers it for the date of death.
• A hillside home in Claraboya or Padua Hills. View, grade and access shaped what buyers paid, and true comparables are few, so the search runs wider along the foothills with the reasoning written down.
• A house the heirs sold soon after the death. The sale is reported and considered, but the no-compulsion clause and the date clause mean it is not adopted as the answer without analysis.

The Claremont area page describes how these pockets separate, and the article on who needs a date-of-death appraisal in Claremont covers who orders one.

What the appraiser does not decide

The appraiser applies the definition and reports the result with its evidence. The appraiser does not decide how the value is reported, whether the estate elects the alternate valuation date, the date six months after death available under 26 U.S.C. section 2032, or how basis is computed. Those decisions belong to the CPA and the personal representative, the executor or court-appointed administrator. The companion article on what the CPA needs on the face of the report lists what the CPA looks for.

Next step

If an estate needs fair market value for a Claremont house as of a past date, see how the estate and date-of-death appraisal is scoped, or call (909) 324-6122. The fee is set by the scope of the assignment and quoted before work begins, and it does not depend on the value. Nothing here is legal or tax advice; your CPA or attorney decides how the value is used.

Sources

• 26 CFR section 20.2031-1, definition of gross estate and valuation of property (fair market value) (accessed October 30, 2026)
• IRS Publication 551, Basis of Assets (fair market value; inherited property) (accessed October 30, 2026)
• 26 U.S.C. section 2032, alternate valuation (accessed October 30, 2026)
• The Appraisal Foundation, Uniform Standards of Professional Appraisal Practice (USPAP) (accessed October 30, 2026)
• Claremont Heritage, architecture of Claremont (accessed October 30, 2026)

Gordon Hall, California Certified Residential Real Estate Appraiser, BREA No. AR003877 (lookup: https://www2.brea.ca.gov/breasearch/faces/party/view.xhtml?id=23601). Reports are prepared in conformity with the Uniform Standards of Professional Appraisal Practice (USPAP). Nothing here is legal or tax advice; admissibility is always the court's decision.