Step-Up in Basis: Definition and How It Works

Step-up in basis refers to the adjustment of an inherited asset's income tax basis to its fair market value (FMV) on the date of the decedent's death (or an alternate valuation date, if elected), under IRC §1014. When a beneficiary inherits an asset, their cost basis for capital gains purposes becomes the FMV at the date of death — not what the decedent originally paid. If the asset appreciated during the decedent's lifetime, that embedded gain is permanently eliminated: the beneficiary can sell the asset immediately after inheritance without recognizing any income tax on the decedent's lifetime appreciation. The step-up in basis is among the most significant provisions in the tax code for estate planning, and CPAs advising clients with appreciated assets — real estate, securities, closely-held business interests — encounter it constantly.

How the Step-Up Works

Under IRC §1014(a)(1), a beneficiary's basis in property received from a decedent is the FMV of the property at the date of the decedent's death. This applies whether the property passes through a will, by operation of law (joint tenancy, beneficiary designation), or through a trust that is includible in the decedent's gross estate.

Example: A client purchased rental property in 2002 for $200,000. At the client's death in 2026, the property is worth $900,000. The client's depreciation deductions over 24 years have reduced their adjusted basis to $100,000. The heir's basis in the inherited property is $900,000 — the FMV at death. If the heir immediately sells the property for $900,000, they owe no capital gains tax or depreciation recapture. The $800,000 of lifetime appreciation ($900,000 FMV − $100,000 adjusted basis) and the accumulated depreciation recapture are permanently forgiven.

Alternate Valuation Date Election

An estate may elect to value assets at six months after the date of death rather than at the date of death, under IRC §2032. This alternate valuation election is available only if: (1) it reduces the gross estate value, and (2) it reduces the estate tax liability. If both conditions are met, the election reduces estate tax but also reduces the step-up in basis for the beneficiaries — a tradeoff that must be modeled. The alternate valuation date election is an estate-level election binding on all assets in the estate; selective application to specific assets is not permitted.

What Qualifies for the Step-Up

The step-up applies to property includible in the decedent's gross estate under IRC §2031–2046 — generally, all property owned by the decedent at death. Key categories:

Individually-owned real estate, securities, and business interests
Tenancy-in-common interests (the decedent's proportionate share gets a step-up)
Property held in a revocable living trust (includible in the estate because the decedent retained control)
JTWROS (joint tenancy with right of survivorship) property — typically 50% gets a step-up for the decedent's half in a married couple situation; 100% of the decedent's contributed portion may get a step-up for non-spousal joint tenants
Business interests (partnership interests, S-Corp stock, LLC membership interests) pass through to heirs at stepped-up basis for the interest as a whole

Property that does not get a step-up: Assets that bypass the estate or are excluded from the gross estate do not receive a stepped-up basis:

Assets in an irrevocable trust where the decedent held no includible interest
Gifts completed during life — basis in a gifted asset carries over from the donor's basis (carryover basis), not stepped up
Retirement accounts (IRAs, 401(k)s) — inherited retirement accounts retain their pre-tax character; distributions to beneficiaries are ordinary income, not capital gains, regardless of account FMV. There is no step-up in basis for inherited IRAs.

Step-Down in Basis (Depreciated Property)

IRC §1014 works symmetrically: if property has declined in value at the date of death, the heir's basis is stepped down to FMV. Inheriting property worth less than the decedent's adjusted basis eliminates the embedded loss — the heir cannot deduct a loss that arose before their ownership. For clients with significant unrealized losses in a portfolio or business, the planning implication is to recognize those losses before death (harvest the loss and get the deduction) rather than letting them expire through the step-down at death.

Planning Implications: Gift vs. Bequest

Because gifted assets carry over the donor's basis (no step-up), while inherited assets get a step-up, the optimal strategy for highly appreciated assets is generally to hold them until death rather than gift them during life. A parent who gifts $500,000 of stock with a $50,000 basis to a child gives the child $50,000 of carry-over basis — meaning a $450,000 taxable gain on a future sale. If the parent instead holds the stock until death, the child inherits it with a $500,000 stepped-up basis and no taxable gain.

This gift-vs.-bequest analysis becomes more nuanced when:

Estate tax applies: If the estate is large enough to generate estate tax (above the $15,000,000 exemption per person under the OBBBA, effective January 1, 2026 — a dramatic increase from the prior $12,920,000 TCJA amount), the basis step-up effectively "pays for" the estate tax: appreciated assets pass to heirs free of income tax on the lifetime gain, but subject to estate tax on the gross FMV.
State estate tax applies: Many states have lower estate tax exemptions ($1,000,000 in Massachusetts, $2,000,000 in Oregon). For clients in those states, holding assets for the step-up may incur state estate tax that erodes the income tax benefit.
High capital gains rates: As the federal capital gains rate increases (currently 23.8% for long-term gains + NIIT for high earners), the value of eliminating embedded gains through the step-up grows.

For the full estate and gift tax planning framework under the $15M OBBBA exemption — including GST trust strategy changes and charitable coordination — see Estate and Gift Tax Planning Under the OBBBA's $15 Million Exemption.

Community Property and the Double Step-Up

In community property states (California, Texas, Arizona, Nevada, Washington, Idaho, Louisiana, New Mexico, Wisconsin), both halves of community property receive a step-up at the death of either spouse — not just the decedent's half. A married couple holding appreciated stock or real estate in California as community property gets a full FMV step-up on 100% of the community property when one spouse dies, even though only 50% was legally the decedent's.

This community property advantage is substantially more favorable than the 50% step-up available for jointly-held property in common law states. CPAs advising married clients in common law states about long-term estate planning should consider whether the couple has the option to hold appreciated assets as community property — particularly for clients who maintain residence in community property states or have assets that can be documented as community property.

Related Terms

Carryover basis — the alternative to step-up basis; applies to gifted assets, where the recipient takes the donor's original basis
Depreciation recapture — the tax on prior depreciation deductions that is also eliminated by the step-up (see Depreciation Recapture: How to Explain It to Clients Selling Rental Property)
Date-of-death FMV — the valuation used to establish the stepped-up basis; must be supportable with qualified appraisal for real estate and closely-held business interests

How CPAs Use Step-Up in Basis in Practice

The step-up is central to estate planning conversations with clients holding low-basis assets:

Hold-versus-sell decisions for appreciated property: When an elderly client holds low-basis rental property or a closely-held business interest, the question is whether the income tax savings from the step-up (eliminating embedded capital gains) outweigh the economic cost of holding the asset longer. This involves modeling the client's estate size, applicable estate tax rate, state income and estate tax exposure, and the heir's anticipated use of the asset.

1031 Exchange vs. Hold-for-Step-Up: A client considering a §1031 like-kind exchange to defer capital gains on rental property should evaluate whether the same result — eliminating the gain — would be achieved more cleanly by holding the property until death. The 1031 exchange defers (but does not eliminate) the gain; the step-up permanently eliminates it. For clients who are unlikely to sell in their remaining lifetime, the step-up may be superior to an exchange that continues to compound deferred gain. See How to Execute a 1031 Like-Kind Exchange for Real Estate Clients.

Inherited IRA vs. Inherited Property Distinction: One of the most frequent client misconceptions: that inheriting an IRA generates a step-up in basis like other inherited property. It does not. Beneficiaries of inherited IRAs owe ordinary income tax on all distributions, regardless of the account's FMV. Only assets that flow through the estate and receive §1014 treatment get the step-up. Keeping this distinction clear in client conversations prevents misplanning.