Step-Up in Basis at Death 2026: How Inherited Assets Reset Their Cost Basis

Somebody inherits a handful of shares their parent bought decades ago for a few hundred dollars, now worth tens of thousands. The instinct is to assume the IRS is owed tax on that entire gain the moment it’s sold. It isn’t — and misunderstanding this one rule is probably the single most expensive mistake heirs make with inherited assets.

My take, up front: step-up in basis is the most underappreciated tax provision most people will ever benefit from, and also one of the most misapplied. Get it right and decades of unrealized capital gains vanish for tax purposes. Get it wrong and you either sell in a panic you didn’t need to, or sit on a documentation gap that turns into a painful bill years later.

This guide covers what qualifies for a step-up, why retirement accounts are the glaring exception, how the community-property double step-up works, whether holding or selling makes more sense, how it sits alongside the federal estate tax exemption, and the mistakes that show up again and again.

How Step-Up in Basis Actually Works

Cost basis is the number you subtract from the sale price to calculate a taxable gain. Under Internal Revenue Code Section 1014, when someone dies, the tax basis of the capital assets they owned resets to fair market value as of the date of death — not what they originally paid.

Say a parent bought a stock for $10 a share decades ago, and by the time they pass away it’s worth $100 a share. If they’d sold it themselves, they would have owed tax on $90 of gain per share. Their heir, instead, inherits it with a basis of $100. If the heir sells immediately at $100, the taxable gain is zero. Ninety dollars of built-in gain simply disappears for income tax purposes — it is never taxed to anyone.

This is fundamentally different from how a lifetime gift is treated, and the distinction trips people up constantly.

Transfer method	Basis treatment	Practical result
Lifetime gift	Carryover basis — recipient inherits donor’s original basis	Built-in gain transfers intact
Inheritance at death	Step-up — reset to date-of-death fair market value	Pre-death built-in gain is erased
Spousal gift (outside community property)	Carryover basis applies	No step-up until a later death

Which Assets Qualify, and Which Are the Big Exception

Step-up doesn’t apply uniformly, and the exceptions are where a lot of confusion — and expensive mistakes — happen.

Assets that generally qualify: publicly traded and closely held stock, bonds, mutual funds, real estate including a primary residence, sole proprietorships, partnership and LLC interests, and personal property like art, jewelry, and collectibles. Most anything that passes to an heir through a will, intestacy, or a revocable living trust falls into this category.

The exception — Income in Respect of a Decedent (IRD): traditional IRAs, 401(k)s, annuities, unpaid salary, and accrued but unpaid interest do not get stepped up. That income was always going to be taxed at ordinary rates whenever withdrawn; death just hands the withdrawal obligation to the beneficiary. A beneficiary who inherits a traditional IRA still owes ordinary income tax on every dollar withdrawn — there’s no basis reset to soften that. If you’re navigating an inherited annuity specifically, spousal and non-spousal beneficiary rules diverge sharply, covered in our guide to annuity beneficiary tax rules.

People assume “inherited” automatically means “basis reset,” withdraw from an inherited IRA the way they’d sell inherited stock, and are surprised by the tax bill.

How the Date-of-Death Value Gets Determined

Establishing the value that becomes the new basis is more procedural than most heirs expect.

Publicly traded securities: generally the average of the high and low trading price on the date of death, or a weighted average across the nearest trading days if death falls on a weekend or market holiday. Brokerage firms will often provide this on request when a beneficiary account is opened, but it’s worth confirming and keeping a copy.

Real estate: a qualified, certified appraisal is the standard. A real estate agent’s comparative market analysis works for planning purposes but usually isn’t strong enough if the IRS challenges the reported basis later, and assessed property tax value is not a substitute for fair market value.

Closely held business interests: a formal valuation is typically necessary, combining discounted cash flow, comparable-company, and net asset value methods to arrive at a defensible number.

The alternate valuation date election: an executor can choose to value the entire estate six months after death instead of on the date of death itself. This only helps when (1) the estate is large enough to require filing Form 706, and (2) the estate’s total value has declined over those six months. It’s an estate-wide, all-or-nothing election — an executor can’t cherry-pick it for individual assets.

Valuation method	Applies to	Documentation needed
Date-of-death average price	Public stocks, bonds	Brokerage statement, exchange data
Qualified appraisal	Real estate, personal property	Certified appraiser’s report
Business valuation	Closely held business interests	Formal valuation report
Alternate valuation date (election)	Entire taxable estate	Form 706 and supporting records

Why Community Property States Get a Double Step-Up

This is the part of the rule most heirs outside a handful of states have never heard of. In community property states — California, Texas, Arizona, Nevada, Washington, Idaho, Louisiana, New Mexico, and Wisconsin — assets acquired during a marriage are treated as jointly owned as a single community asset, not as two separate 50% interests.

In a common-law state, when one spouse dies, only their half of a jointly held asset steps up. The surviving spouse’s original half keeps its old, lower basis.

In a community property state, the entire asset steps up when the first spouse dies — including the surviving spouse’s original half. That’s the “double step-up,” and it’s a meaningful planning advantage for married couples in those states holding highly appreciated assets.

Feature	Common-law state	Community property state
Portion stepped up	Deceased spouse’s share only (typically 50%)	Entire asset (100%)
Surviving spouse’s original share	Keeps original basis	Also resets to date-of-death value
Typical states	New York, Florida, Illinois, and most others	California, Texas, Arizona, and the community-property list above
Requirement	None beyond joint ownership	Asset must be properly characterized as community property

One wrinkle: couples who accumulate assets in a community property state and later move to a common-law state generally keep that community-property character. The reverse — moving into a community property state with assets acquired elsewhere — is murkier and depends on titling and commingling after the move. Document the history early.

Hold or Sell? Deciding What to Do With Inherited Assets

Right after a step-up is, mechanically, the best possible moment to sell from a tax standpoint — basis and market value are close together, so the taxable gain is minimal. That doesn’t mean selling is automatically the right call.

Selling sooner tends to make sense when: the inherited position is concentrated in a single stock and diversification is overdue, the estate needs liquidity to settle debts or divide assets among multiple heirs, or the asset (a rental property with heavy management demands, for instance) isn’t one you’d choose to own going forward.

Holding tends to make sense when: you believe the asset still has room to appreciate, it produces income (dividends, rental cash flow) you want, or it’s a primary residence you intend to actually live in.

The cleanest mental model: once the step-up has happened, ask “would I buy this asset today at its current value?” If yes, hold it. If no, the fact that it was inherited shouldn’t change the decision — gains from that point forward are taxed under the same capital gains rules that apply to any other asset sale.

Real estate carries one more wrinkle: in some states, a change in ownership through inheritance triggers a property tax reassessment closer to current market value, raising the annual bill even though the income tax basis reset is a clear win. Check your state’s reassessment exclusions before assuming the transfer is a pure win.

How Step-Up Interacts With the Federal Estate Tax Exemption

These two rules get conflated constantly, but they operate on entirely separate tracks. The estate tax applies to the total value of everything a person owned at death, above a federal exemption amount that has changed over time and can change again with future legislation — always confirm the current figure directly with the IRS or a qualified advisor rather than relying on an older number.

• If the total estate falls under the exemption amount, no federal estate tax is owed — and step-up in basis still applies in full to every qualifying asset.
• If the estate exceeds the exemption, estate tax is owed only on the excess — and step-up in basis still applies in full to every qualifying asset.
• Whether or not any estate tax gets paid has no bearing on whether an heir’s basis gets reset.

Where the two rules do intersect is documentation: for an estate required to file Form 706, the values reported on that return effectively become the heirs’ new basis figures. That creates real tension — an executor may want lower values to minimize estate tax, while heirs want higher values to minimize future capital gains tax. The IRS has tightened basis-consistency reporting to close that gap, so use one defensible, well-documented valuation from the start. Executors handling this alongside the decedent’s final personal filing may also find our comprehensive income tax filing guide useful, since the two often run on overlapping timelines.

The Five Mistakes Heirs Make Most Often

1. Never documenting the date-of-death value. Without a brokerage statement or an appraisal from around the time of death, there’s no way to prove basis when the asset is eventually sold — potentially years later. Worst case, the IRS treats the entire sale proceeds as taxable gain.
2. Assuming retirement accounts get the same treatment. IRAs, 401(k)s, and annuities are IRD assets. Ordinary income tax applies to distributions regardless of how much the account grew before death.
3. Missing community-property status. Heirs in a community-property state sometimes step up only the decedent’s half out of habit or unfamiliarity with the rule, leaving real tax savings on the table.
4. Confusing lifetime gifting with inheritance planning. Gifting a highly appreciated asset during life to “get ahead” of estate settlement can backfire, since carryover basis means the recipient inherits the built-in gain instead of having it erased.
5. Waiting too long to get an appraisal. A valuation done well after death costs more and carries less credibility with the IRS than one obtained close to the date of death, when records and comparable data are freshest.

A Practical Guide: Process and What It Tends to Cost

Step-up itself isn’t something you apply for — there’s no separate form to elect it. But getting it right in practice means moving through a few concrete steps.

Step 1 — Inventory everything. List every asset the decedent owned: brokerage accounts, real estate, business interests, retirement accounts (separately, since they’re treated differently).

Step 2 — Get appraisals where needed. Costs vary widely by region and complexity — a single-family home appraisal is often in the low hundreds of dollars, while a commercial property or business valuation can run into the thousands. Get two or three quotes and use a certified appraiser rather than an informal opinion of value.

Step 3 — Determine if probate is required. Assets passing through a will typically go through probate court; assets already titled in a revocable living trust generally bypass it. Timelines and costs vary significantly by state.

Step 4 — Bring in professionals for anything nontrivial. A sizable estate, one spanning multiple states, or one with a business interest usually warrants both an estate attorney and a CPA. Fee structures vary — flat fee, hourly, or a percentage of estate value — so get the billing arrangement in writing first.

Step 5 — Keep every record. Appraisals, brokerage cost-basis statements, and any estate tax return copies should be retained for as long as the assets might be audited after a future sale.

Quick checklist

• Full inventory of the decedent’s assets completed
• Date-of-death values documented for publicly traded assets
• Appraisals ordered for real estate and closely held business interests
• Community-property status confirmed based on state of residence
• Probate requirement determined
• Estate attorney and/or CPA engaged, if warranted
• All supporting documents scanned and backed up

Metrics and Rules to Recheck Every Year

A few things worth revisiting whenever a new inheritance situation comes up, since they shift over time:

• The current federal estate tax exemption amount — it has moved with legislation before and can move again; always verify the current figure with the IRS rather than relying on a prior year’s number.
• Whether your state imposes its own estate or inheritance tax — several states apply one independently of the federal system, often at much lower exemption thresholds.
• Community-property characterization rules in your state, especially after an interstate move.
• Property tax reassessment exclusions, if real estate is part of the inheritance — these vary by state and change periodically.

These variables matter most for larger estates and families with assets spread across multiple states. Families using a revocable living trust or a spendthrift trust for asset protection as part of their broader estate plan should review how basis rules interact with the trust structure they’ve chosen, since not every trust type treats basis the same way at the grantor’s death.

Related Reading

• 1031 exchange: deferring real estate capital gains tax
• Annuity beneficiary tax rules: spousal vs. non-spousal options
• Comprehensive income tax filing guide
• Property tax reduction strategies
• Spendthrift trusts for estate planning and asset protection
• Capital gains tax guide for stock sales

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This article is for informational purposes only and does not constitute tax or legal advice. Step-up in basis rules, the federal estate tax exemption, and community property statutes can change with legislation and vary by state. Consult a licensed CPA or estate planning attorney and check current IRS guidance before making any decisions about an inheritance.