A step‑up in basis is a U.S. tax rule that resets the cost basis of an inherited asset to its fair market value (FMV) on the decedent’s date of death (or to an alternate date in some cases). Cost basis is the starting point for calculating capital gains or losses when an asset is later sold. By increasing the basis to the FMV at death, unrealized gains accrued during the decedent’s lifetime generally escape capital‑gains tax when passed to heirs.
How it works — plain language explanation
– Owner buys an asset (stock, real estate, collectible) and its basis equals purchase price plus improvements, adjustments, etc.
– If the asset rises in value over time and the owner dies while holding it, the heir’s basis is set to the asset’s FMV at the owner’s death.
– If the heir sells immediately at that FMV, there is no capital gain (basis = sale price). If sold later, taxable gain equals sale price minus the stepped‑up basis.
– If the asset’s FMV at death is lower than the decedent’s basis, the heir receives a stepped‑down basis.
Simple numeric example
– Jane bought stock for $2. At her death the stock is worth $15.
– If sold before death at $15, Jane (or her estate) would owe tax on a $13 gain.
– With step‑up, the heir’s basis becomes $15. If the heir sells at $15, there is no capital gains tax on the $13 appreciation that occurred during Jane’s lifetime.
Key points and exceptions
– What types of property: Stocks, bonds, mutual funds, real estate, and many tangible assets included in the decedent’s estate typically qualify for step‑up/step‑down.
– What does not get a step‑up: Traditional IRAs, 401(k)s and other tax‑deferred retirement accounts—these are taxed as ordinary income on distribution. Property gifted before death usually retains the donor’s basis (carryover basis). Trusts and ownership structures can change treatment (see practical steps).
– Alternate valuation date: For some estate tax purposes a personal representative may elect an alternative valuation 6 months after death (IRS rules) if it lowers the estate’s value; that election can affect basis for certain assets. (See IRS Publication 551.)
How step‑up is calculated
There is no complicated formula: the heir’s basis becomes the FMV of the asset on the date of death (or the alternate valuation date if elected validly and applicable). When the asset is later sold, capital gain/loss = sale price − new (stepped) basis.
Community property rules (double step‑up)
– In community property states, when one spouse dies, community property typically receives a “double step‑up”: both spouses’ halves are revalued to FMV at the date of the deceased spouse’s death, so the entire asset basis steps up.
– In common‑law (non‑community property) states, a surviving spouse usually receives a step‑up only on the decedent’s share. For jointly held property, the survivor’s half may not get stepped up, so only part of the asset receives the basis adjustment.
– Some states (e.g., Alaska, Kentucky, South Dakota, Tennessee) permit community property trusts that can enable community‑property treatment (and the double step‑up) for assets placed in the trust. (State laws and trust rules are complex—consult local counsel.)
Example — joint brokerage account (common‑law vs community property)
– Ann and Bill hold stock worth $200,000 with combined basis $100,000. Bill dies.
• Common‑law: Bill’s half ($100,000) steps up. New combined basis = $150,000 (Ann’s $50,000 original + Bill’s $100,000 stepped‑up).
• Community property state: Entire $200,000 basis steps up to FMV, so new basis = $200,000.
Policy debate — is it a loophole?
– Critics: The step‑up can shelter large unrealized gains from income tax at death, disproportionately benefiting wealthy households. Analyses (CBO, tax policy groups) show a large share of the tax benefit accrues to higher‑income taxpayers. Some policymakers have proposed limiting or eliminating the step‑up for high‑value estates.
– Supporters: Argue repeal could discourage saving, add complexity, and may create perceived double taxation if combined with an estate tax on the same gains. Also note that very few estates currently pay federal estate tax (the 2017 tax law raised the exemption significantly).
Planning and practical steps — for beneficiaries
1. Inventory assets and documentation
• Obtain account statements, title documents, deeds, and any records of the decedent’s purchase prices and improvements. If the broker has cost basis information, request it.
2. Determine whether assets are included in the decedent’s estate and who owns them (sole name, joint tenants, tenants by the entirety, community property, trusts). Ownership affects whether and how much basis steps up.
3. Get valuations for illiquid assets
• For real estate, businesses, art, collectibles or closely held stock, obtain qualified appraisals dated as of the date of death (or alternate valuation date if applicable). Keep appraisal reports to substantiate basis.
4. Check whether an estate tax return/Form 706 is required
• Even if estate tax isn’t due, filing may be useful to document basis determinations for the IRS and heirs. Consult a tax advisor.
5. When selling, compute gain using stepped‑up basis
• Capital gain = sale price − stepped‑up basis; long‑term vs short‑term rules are generally irrelevant for inherited property because it’s treated as long‑term property regardless of holding period.
6. Document everything
• Keep appraisals, brokerage confirmations, valuations, and correspondence. The IRS may request substantiation if questions arise years later.
7. Consult professionals
• Use a CPA or tax attorney for complex estates (real estate, business interests, trusts, or potential estate tax exposure).
Practical steps — for estate planners and owners
1. Review ownership categories
• Joint ownership, tenancy by the entirety, trusts, and community property can change how basis adjusts at death. Consider ownership structure and state law.
2. Consider community property trusts (where available)
• In some states or under some arrangements, community property trusts can capture the double step‑up benefit—consult local tax and trust counsel.
3. Gift vs hold decisions
• Gifting an appreciated asset during life transfers the donor’s basis to the recipient (carryover basis). That can defer capital gains but may expose the donee to the donor’s original basis on sale. Decide strategically whether gifting or holding to death is preferable.
4. For assets with embedded losses
• If an asset has declined in value and is expected to recover, gifting before death may preserve a loss for the donor/donee. (See specialized guidance—this is nuanced.)
5. Consider the estate tax interplay
• If repeal or modification of step‑up is a political possibility, consider tax‑efficient strategies (trust structures, lifetime gifting, insurance) with advisors.
6. Keep beneficiaries informed
• Provide heirs with records and instructions for locating original purchase documents and valuation reports.
Common pitfalls and FAQs
– Q: Does a stepped‑up basis apply to IRAs and retirement accounts?
A: No. Retirement accounts are taxed as ordinary income on distributions; the step‑up rule does not apply to these accounts.
– Q: Do I get a step‑up on gifts made during life?
A: No—gifts generally carry over the donor’s basis (carryover basis), not a step‑up.
– Q: If I inherit an asset and later give it away, what happens?
A: If you give inherited property to someone else, special basis rules can apply; consult a tax professional.
– Q: How long do I have to sell to get long‑term treatment?
A: Inherited property is treated as long‑term regardless of how long the heir holds it.
Arguments for and against (brief)
– For: Simplicity for heirs, prevents forcing sales at death to raise cash for income tax, avoids administratively difficult tracing of very old cost bases and recordkeeping.
– Against: Loss of tax revenue and a posthumous shelter for large capital gains, which disproportionately helps wealthy households.
Bottom line
A step‑up in basis is a powerful tax rule that can eliminate capital gains tax on appreciation accumulated during a decedent’s lifetime by resetting the heir’s basis to FMV at death. It applies broadly to property included in the estate (stocks, real estate, certain tangible assets) but not to retirement accounts and typically not to property transferred during life. The rule presents important estate‑planning considerations—particularly the treatment of jointly held property and community property—and is the subject of ongoing policy debate because of its revenue and distributional effects.
Primary sources and further reading
– Investopedia — “Step‑Up in Basis”:
– IRS Publication 551, Basis of Assets:
– IRS Topic No. 703, Basis of Assets:
– Tax Foundation — materials on stepped‑up basis:
– Congressional Budget Office — “The Distribution of Major Tax Expenditures in 2019” (discussion of distributional effects)
– Committee for a Responsible Federal Budget — analysis on closing the stepped‑up basis provisions
– Kitces — practical advisor guidance on basis, gifting, and preserving losses
– Peter G. Peterson Foundation — analysis of fiscal impact of step‑up in basis
Editor’s note: The following topics are reserved for upcoming updates and will be expanded with detailed examples and datasets.