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Step-Up in Basis Explained

Why the value of inherited property on the date of death matters — and where an appraisal fits into that picture.

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Estate & Legal5 min read

"Step-up in basis" comes up constantly in estate conversations, and it's genuinely a tax concept — but the property valuation piece of it is where an appraiser's work directly matters.

The Three Pieces That Matter

What 'Basis' Means

In general tax terms, basis is the starting value used to calculate gain or loss when a property is later sold. For most inherited property, that starting point is generally the property's fair market value on the date of death rather than what the original owner paid for it.

Why the Date-of-Death Value Matters

Because basis is generally tied to value as of a specific date, a well-supported date-of-death appraisal creates the documented record a tax professional needs to calculate basis accurately.

What Happens Without Documentation

Without a contemporaneous or retrospective appraisal establishing that date-of-death value, heirs may have a harder time supporting their basis calculation if the property is sold later and the IRS asks questions.

Where an Appraisal Fits In

An appraiser's job is narrow but important here: developing a well-supported, independent opinion of the property's value as of the date of death (a "retrospective" or "date-of-death" appraisal). What a tax professional does with that number — how it factors into basis, capital gains, or estate tax filings — is outside an appraiser's scope.

Why Documentation Matters Later

If the property is sold years after it's inherited, a well-documented, independent date-of-death appraisal is generally far more defensible than an informal recollection or a rough estimate — especially if the sale is ever reviewed by tax authorities.

What This Does Not Mean

This page does not calculate basis, estimate a specific tax outcome, or substitute for CPA or tax attorney guidance. It's strictly an explanation of why the underlying property value matters and how an appraisal supports that documentation.

Frequently Asked Questions

No. This is a general, educational explanation of why appraisers are often asked to establish a date-of-death value. Basis calculations, tax filing requirements, and how they apply to your specific situation are questions for a CPA or tax attorney.

A date-of-death value can often be established later through a retrospective appraisal, but ordering it sooner — while records and comparable sales data are easier to research — is generally more straightforward.

Basis rules can vary depending on how property was titled, whether it was jointly owned, and other estate-specific factors — a tax professional can confirm how the rules apply to your specific inheritance.

A documented date-of-death value becomes especially important in that scenario, since it's the reference point a tax professional will likely use to calculate any gain or loss on the sale.

Often yes — a properly scoped date-of-death appraisal can support both purposes, since both rely on the same effective date and market value. Confirm the intended use with your attorney or CPA when ordering it.

Continue Learning

Next RecommendedWhat Is a Date-of-Death Appraisal?Related TopicRetrospective Appraisal ExplainedExplore Estate & LegalSelling an Inherited Home: Appraisal Considerations

This information is provided for general educational purposes and is not tax or legal advice. Basis and estate tax rules are complex and situation-specific — consult a CPA or tax attorney for guidance specific to your case.

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Last reviewed: August 2026

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