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.
| 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.
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 a basis file before distributing the estate
- 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.”
Keep the valuation evidence even after the property is sold
Ask the appraiser for a valuation tied to the date of death, not today's listing price, and keep the assumptions behind that value. If the property is appraised months later, the report should still explain how it reaches the historical fair-market value required for the date in question.
Do not confuse basis with net sale proceeds. Mortgage payoff changes the cash received at closing but generally is not the same thing as tax basis; selling expenses and post-death capital improvements can have their own effects. The tax preparer needs the closing statement and the valuation evidence, not just the check deposited into the estate account.
Save the date-of-death appraisal or market support, closing statement, improvement records after death, and any basis information supplied under estate-tax reporting rules. The old purchase price may still belong in the historical file, but do not let it replace the inherited-basis evidence needed to explain the beneficiary's later gain or loss.
For marketable securities, the basis file can often be reconstructed from the brokerage's date-of-death valuation. Real estate is different: a later sale price may be useful evidence but is not automatically the date-of-death fair market value. Preserve the appraisal engagement, comparable sales, photographs, and any facts about the property's condition at death. If a tax return uses an alternate valuation method or a basis value reported from an estate-tax filing, reconcile that information before a beneficiary reports a later sale.
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.