Step-Up in Basis Explained: The Most Valuable Tax Concept Most People Have Never Heard Of

When you inherit an asset, the IRS resets its taxable "purchase price" to whatever it was worth on the day the previous owner died. This is called step-up in basis (26 USC Section 1014). It can eliminate decades of accumulated capital gains in a single event, potentially saving heirs tens or even hundreds of thousands of dollars in federal taxes. Documenting it correctly is one of the most valuable things a CPA does for anyone who has inherited property.

What Step-Up in Basis Actually Is

Inherited property gets its tax "purchase price" reset to whatever it was worth on the day the previous owner died. All prior appreciation disappears from the tax ledger. No one pays capital gains on it -- not the estate, not the heir.

Every asset you own has a "basis" for tax purposes -- usually what you paid for it. When you sell, you owe capital gains tax on the difference between the selling price and your basis. Buy stock at $50,000, sell at $500,000, and you have a $450,000 taxable gain.

But when you inherit that same stock, the rules change. Your basis is no longer the $50,000 the original owner paid. It is $500,000 -- the value on the day they passed. Sell for $510,000 and your taxable gain is $10,000, not $460,000. That single rule saves roughly $107,000 in federal capital gains taxes. IRC Section 1014 resets the basis of inherited property to fair market value (FMV) on the date of the decedent's death.

The basis "steps up" (or, in declining markets, steps down) to the date-of-death value, regardless of what the original owner paid or when they bought it. It applies to:

• Stocks and bonds
• Real estate
• Business interests
• Collectibles
• Most other capital assets that pass through an estate

How the Step-Up Works in Practice

Everything hinges on one date: the date of death. The valuation method depends on the type of asset.

Publicly traded securities use the mean of the high and low trading prices on the date of death. 26 CFR 20.2031-2. If the person died on a weekend or holiday, you use a weighted average of the nearest trading days. Your brokerage firm will typically report date-of-death values on statements issued to the estate, but it is the executor's responsibility to verify them.

Real estate requires a qualified appraisal to establish fair market value on the date of death. 26 CFR 20.2031-1(b). "Zillow says it's worth $600,000" will not hold up with the IRS. You need a licensed appraiser who documents the property's value as of the specific date the owner died. This appraisal is one of the first things a CPA will tell you to order.

Closely held businesses typically require a professional business valuation. The appraiser considers the company's earnings, assets, comparable sales, and applicable discounts for lack of marketability or minority interest.

Collectibles (art, antiques, coins, wine) do get the step-up, but gains above the stepped-up basis face a higher maximum capital gains rate of 28%, compared to the standard 20% long-term rate. IRC 1(h)(4) sets the 28% maximum rate for collectibles gains. The step-up still saves money by resetting the basis, but the rate difference matters for planning.

Community Property States and the Double Step-Up

Surviving spouses in community property states can get both halves of jointly held property stepped up -- not just the decedent's half. This "double step-up" can save significantly more than the standard single step-up. (For a broader guide to the tax issues surviving spouses face, see The First Tax Season After Losing a Spouse.)

In most states, only the decedent's half of jointly held property receives a step-up. The surviving spouse's half keeps its original basis. But in community property states, both halves get stepped up. 26 USC Section 1014(b)(6) provides the double step-up for community property.

The nine community property states are:

1. Arizona
2. California
3. Idaho
4. Louisiana
5. Nevada
6. New Mexico
7. Texas
8. Washington
9. Wisconsin

Alaska is not a community property state by default, but it allows couples to opt in through an Alaska Community Property Trust. If a couple has established such a trust, their assets can qualify for the double step-up.

This is why proper asset titling matters so much. If accounts are not titled correctly as community property, the double step-up may not apply even in a community property state. It is also why estate planning attorneys in common law states sometimes recommend Alaska Community Property Trusts.

What Does NOT Get a Step-Up

Assets representing income the decedent earned but had not yet been taxed on -- called "income in respect of a decedent" (IRD) -- do not receive a step-up. IRD is defined under IRC Section 691 and excluded from step-up treatment by Section 1014(c). The rule is straightforward: if the money was never taxed going in, the step-up does not erase the tax bill coming out.

The most common IRD assets that are excluded from the step-up:

• Traditional retirement accounts (IRA, 401(k), 403(b)) -- the entire balance remains taxable as ordinary income when withdrawn by the heir, subject to Required Minimum Distribution rules. The step-up does not apply because the money was never taxed in the first place; it has been sitting in a tax-deferred wrapper.
• Series EE and Series I savings bonds with accrued but unreported interest -- the accrued interest is IRD
• Installment sale receivables -- the remaining gain built into future payments is still taxable to the heir
• Deferred compensation -- unpaid amounts are ordinary income to the heir when received
• Accrued but unpaid dividends and interest at the time of death

Technical detail

There is partial relief for the double taxation problem IRD creates. When an estate is large enough to owe federal estate tax, the heir can claim an income tax deduction under Section 691(c) for the estate tax attributable to the IRD items. This prevents the same dollars from being fully taxed twice, though it does not eliminate the income tax entirely.

The Alternate Valuation Date

If markets drop significantly in the months after someone dies, the executor may be able to use a lower valuation date -- potentially reducing both estate tax and the stepped-up basis. IRC Section 2032 provides for the alternate valuation date election.

Under this election, all estate assets are valued as of six months after the date of death instead of the date of death itself. If a person died on January 15 and the stock market fell 30% by July 15, the executor might prefer the lower values.

The election comes with strict rules:

• All or nothing. You cannot cherry-pick which assets use which date. Every asset in the estate must be valued on the same date.
• Must reduce both the gross estate value and the estate plus GST tax liability. If it would not reduce both, the election is not available. Section 2032(c).
• Assets sold or distributed within the six-month window are valued at the date of sale or distribution, not the six-month mark.
• Irrevocable once made on the estate tax return. Filed on Form 706.

In practice, this election matters most for large estates in declining markets. For estates below the filing threshold, the alternate valuation date is rarely a factor because there is no estate tax to reduce.

Documentation Requirements

The step-up is only as valuable as your ability to prove it. Without proper documentation, the IRS can default to the original owner's basis -- which could mean paying taxes on decades of gains you do not actually owe.

**File the basis report if required.** Executors of estates required to file a federal estate tax return must report the final basis of inherited property to both the IRS and the beneficiaries.

Technical detail

Form 8971 and its Schedule A are the reporting mechanism (IRS Publication 551). Each beneficiary receives a Schedule A showing the assets they inherited and their reported basis. Filed alongside Form 706.

Beneficiaries must use the same basis reported on the estate tax return -- inconsistent reporting can trigger a 20% accuracy-related penalty. IRC Section 6662.

Order real estate appraisals promptly. The longer you wait, the harder it is for an appraiser to establish what the property was worth on a specific past date. Many estate attorneys recommend ordering the appraisal within 90 days of death.

Verify brokerage statements. Brokerage firms typically provide date-of-death values for publicly traded securities, but you should verify them and keep copies. Some brokers will issue a date-of-death valuation letter upon request.

Document even when Form 8971 is not required. For estates below the estate tax exemption threshold, Form 8971 is not required. But you should still keep the date-of-death appraisals, brokerage statements, and any other valuation records. If you sell the inherited property years later, you will need to prove your basis.

Current Law: Where Step-Up Stands After OBBBA

Step-up in basis is settled law for the foreseeable future. The One Big Beautiful Bill Act (OBBBA), signed on July 4, 2025, preserved step-up without modification and made the estate tax exemption permanent at $15 million per individual (effectively $30 million per married couple) starting in 2026 (Tax Foundation analysis of OBBBA).

Technical detail

Step-up has survived every serious legislative challenge. Congress tried replacing it with a carryover basis system in 1976 (Tax Reform Act), but the change was so unpopular and administratively unworkable that it was retroactively repealed in 1980 before it ever took full effect. In 2010, the estate tax was temporarily repealed for one year, and executors could choose between no estate tax with carryover basis or the traditional estate tax with step-up. The experiment was not repeated. From 2021 through 2024, the Biden administration proposed eliminating or limiting step-up several times. None of these proposals were enacted.

For heirs, this is the best of both worlds: no estate tax (for the vast majority of estates) and no capital gains tax on pre-death appreciation. For the federal treasury, it means capital gains on assets held until death are never taxed. Economists debate whether this is good policy, but for families inheriting property, the practical effect is significant.

The Anti-Abuse Rule

IRC Section 1014(e), enacted in 1981.

The rule: if you gift appreciated property to someone, that person dies within one year, and the property passes back to you (the original donor) or your spouse, the step-up does not apply. You keep the same basis you had before the gift.

The scenario this prevents: an adult child owns stock with $500,000 in unrealized gains. The child gifts the stock to an elderly, ill parent. The parent dies three months later and the stock comes back to the child through the will. Without this rule, the child would have laundered $500,000 in gains through the parent's estate and received a free step-up.

The one-year lookback means that if the original donor wants to benefit from the step-up, the recipient must survive for at least one year after receiving the gift, and even then, the property must pass to someone other than the original donor.

A Concrete Example: What the Step-Up Saves

The numbers make the case more clearly than the theory.

The situation: Margaret bought 5,000 shares of a stock in 1995 for $10 per share. Her total cost basis is $50,000. By the time she passes away in 2026, those shares are worth $100 per share, or $500,000 total.

This example uses a relatively modest portfolio. For families with real estate that has appreciated over 30 or 40 years, or with concentrated stock positions from a career at a single company, the savings from the step-up can run into the millions.

When to Get Professional Help

Getting the documentation right at the beginning saves real money later. A CPA who works with estates and inherited property can help with:

• Valuation timing -- ordering the right appraisals at the right time, and deciding whether the alternate valuation date makes sense for the estate
• Community property analysis -- determining whether the double step-up applies, which requires reviewing how assets were titled, what state the couple lived in, and whether any community property agreements or trusts are in place
• IRD identification -- separating assets that receive a step-up from those that do not; missing an IRD item could mean paying too much tax, and claiming a step-up on an IRD item could trigger penalties
• Form 8971 compliance -- filing the basis consistency report correctly and on time, and making sure beneficiaries use the reported basis on their own returns
• Holding period and tax rate optimization -- inherited property is automatically treated as long-term for capital gains purposes, regardless of how long you have held it, but the applicable rate depends on the type of asset, your income, and whether the net investment income tax applies

If you have inherited property worth more than $100,000, or if the estate involves real estate, closely held business interests, or assets in a community property state, the cost of professional advice is small relative to what is at stake.