When someone inherits appreciated property, the old purchase price is often not the number used to measure the heir's later gain. Federal tax law generally gives inherited property a basis tied to fair market value at the date of death, subject to exceptions and special elections.
That rule can dramatically change the tax calculation, but it only helps if you can document the value and track what happens after death. Treat valuation as a recordkeeping job rather than a slogan about a 'free step-up.'
Separate three numbers that families often mix together
IRS Publication 559 explains the general inherited-property basis rule and points to Publication 551 for basis details. The date-of-death value can replace a decades-old purchase basis, which is why executors should preserve valuation records even if nobody expects to sell immediately.
An estate-tax return can also affect the value that beneficiaries must use, and an executor may have reporting obligations about basis for certain estates. If Form 706 or Form 8971 is involved, do not substitute a casual real-estate estimate for the tax reporting.
Keep probate inventory value, date-of-death fair market value, and eventual sale price conceptually separate. They may overlap, but they answer different questions and can be determined at different times. A later high offer does not automatically rewrite the earlier historical valuation. Keep the appraisal, comparable sales, property condition evidence, and closing statement so the basis calculation can be reconstructed if a tax notice arrives years later.
| Number | What it describes | Where it comes from |
|---|---|---|
| Decedent’s old cost | What the decedent paid plus adjustments | Old closing records / improvements |
| Date-of-death fair market value | Historical value used for many inherited-basis calculations | Qualified appraisal / market evidence |
| Heir’s eventual sale price | What the property later sells for | Closing statement |
A $120,000 house can produce a $10,000 gain instead of a $290,000 gain
Assume a parent bought a home for $120,000 many years ago. At death, a defensible appraisal values it at $400,000. The beneficiary later sells for $410,000 and, for this simplified illustration, there are no other basis adjustments or selling-cost effects. A $400,000 inherited basis would produce roughly $10,000 of gain—not $290,000 measured from the parent's old purchase price.
Real returns are less tidy. Capital improvements after death can adjust basis, selling expenses affect the calculation, depreciation can matter if the property is rented, and alternate valuation rules may apply when an estate-tax return makes a valid election. Use the example to understand the mechanism, not to prepare a tax return from one paragraph.
Do not let the basis file disappear after distribution. Give the beneficiary copies of the valuation evidence with the property transfer records. The executor may close the estate long before the beneficiary sells. If the only record of the date-of-death value remains on an executor’s old laptop, the beneficiary can face an avoidable documentation problem at sale time.
The simplified example compares original cost, inherited basis, and later sale price.
The appraisal should answer a historical question
Tell the appraiser the valuation date is the date of death and that the report may be used for estate and tax records. A current market analysis prepared months later is not automatically a date-of-death valuation. The report should explain the property condition and comparable sales relevant to the historical date.
For publicly traded securities, the valuation method differs from real estate because market quotations are available. For a closely held business, farm, artwork, or unusual property, a specialist may be necessary. The executor's inventory value, estate-tax value, and beneficiary basis should not drift apart without an explanation.
Community property can change the basis story
In community-property situations, federal basis rules can result in a basis adjustment for both the decedent's and surviving spouse's portions when the statutory requirements are met. That is sometimes called a 'double step-up,' but the label is too broad to apply without checking whether the asset really was community property and whether the federal rule applies.
Joint tenancy, tenancy by the entirety, separate property, and community property are not interchangeable ownership forms. Give the CPA the deed, acquisition records, marital-property agreement if any, and state of domicile rather than describing the asset only as 'our house.'
Build the basis file before the asset is sold, not during tax preparation months later. Keep the date-of-death valuation evidence, records of any post-death capital improvements, sale documents, and the statement showing who sold the asset. If an alternate valuation or special rule is actually being considered, flag that for the tax professional rather than substituting a later market estimate on your own. The file should let someone trace how the reported gain or loss was calculated from the inherited value to net sale proceeds without relying on a broker's automatically populated basis field that may be missing or incomplete.
Build a basis file before distributing the estate
If the estate contains securities or multiple properties, create a separate basis sheet for each asset rather than one estate-wide number. Record the decedent’s ownership interest, valuation method, date-of-death value, any alternate valuation rule actually used by the estate if applicable, and later adjustments supplied by the tax professional. That sheet can travel with the asset to the beneficiary and prevents a future sale from depending on a vague memory of the probate inventory.
- Certified death certificate and date of death.
- Appraisal or valuation statement with the correct valuation date.
- Estate inventory and any Form 706 / Form 8971 information that applies.
- Receipts for capital improvements made after death.
- Rental depreciation schedules if the property is placed in service.
- Closing statement and selling-cost records when the property is sold.
Basis file cover: “123 Oak St — DOD 4/18/2026 — appraisal FMV $400,000 — no alternate valuation election confirmed — new roof $18,600 on 8/2/2026 — sale documents filed separately.”
- Date of deathPreserve the historical fair-market-value support and ownership records.
- After deathSave capital-improvement receipts and rental depreciation records if applicable.
- At transferGive the beneficiary the valuation and estate-tax basis information that applies.
- At saleKeep the closing statement, selling-cost records, and basis worksheet together.
The beneficiary may need the valuation file after probate has closed.
Keep the valuation evidence even after the property is sold
Keep a date-of-death valuation and its supporting assumptions, plus later sale and improvement records. A report prepared after death should explain how it estimates fair market value on the relevant historical date; a current list price or later sale is not automatically the same value.
Give the preparer the appraisal or market support, any estate-tax basis statement or Form 8971/Schedule A that applies, post-death improvement records, and the closing statement. Reconcile the value used on the tax return with the value supplied to beneficiaries and the estate accounting.
Do not use the mortgage payoff as a substitute for basis. It changes the cash remaining at closing, while basis and selling-cost adjustments follow separate tax rules. Preserve the original purchase history as context, but keep it distinct from the inherited-basis evidence.
Basis records worth preserving now
Is inherited property always stepped up?
No blanket statement covers every asset and circumstance. IRS guidance gives a general fair-market-value-at-death rule for inherited property, but exceptions, estate-tax valuations, alternate valuation elections, community-property rules, income-in-respect-of-decedent items, and other provisions can change the result. Use the asset’s actual facts.
Do I need an appraisal if I sell right away?
A near-term arm’s-length sale can be relevant evidence of value, but executors still need to satisfy estate inventory, court, lender, and tax-record requirements. A formal appraisal may be prudent or required for real estate or unusual assets. Ask the estate’s tax professional what documentation is appropriate.
Does the beneficiary pay tax on the entire increase since the decedent bought the house?
Often not. If the inherited basis is fair market value at death, post-death appreciation is what generally drives the beneficiary’s gain. The simplified $120,000-to-$400,000-to-$410,000 example illustrates why documenting the date-of-death value is so important.
Can the executor choose a lower or higher basis?
No. Basis follows federal tax rules and, where relevant, estate-tax values and elections. An executor should obtain supportable valuations and provide beneficiaries the required information rather than selecting a number to create a preferred tax result.
Do I need a date-of-death appraisal if nobody plans to sell right away?
A formal appraisal is not mandatory for every inherited asset, but preserving defensible date-of-death value evidence can prevent a difficult reconstruction years later. The more material, unique, or likely-to-be-sold the property is, the stronger the case for obtaining qualified valuation evidence now.