Step-Up in Basis: How It Works, What It's Worth, and Which Assets Qualify

If you have appreciated stocks, real estate, or other investments, the step-up in basis rule may be the most valuable tax benefit available to your heirs — eliminating capital gains tax on decades of growth in a single moment. But the rule has critical exceptions: retirement accounts (IRAs, 401ks) do not qualify. And the decision to gift assets now versus hold them until death can mean a difference of tens or hundreds of thousands of dollars in your family's tax bill. This guide explains how it works, shows you the math with an interactive calculator, and walks through the planning strategies worth knowing.

What is the step-up in basis?

When you inherit an asset, the Internal Revenue Code resets your cost basis to the asset's fair market value on the date of the original owner's death. This is the step-up in basis, governed by IRC § 1014.¹

Why it matters: capital gains tax is calculated as the difference between what you sell an asset for and your cost basis. A higher basis means less gain — and a basis equal to the current market value means zero taxable gain if you sell immediately after inheriting.

Step-up in basis calculator: sell now vs. hold for heirs

Enter your appreciated asset details to compare the tax cost of selling today versus holding the asset until death and passing the step-up to your heirs.

How the step-up in basis works: the mechanics

Under IRC § 1014, the basis of property acquired from a decedent is its fair market value on the date of death (or on an alternate valuation date, if the executor elects it under IRC § 2032). The heir's holding period is automatically treated as long-term — regardless of how recently the decedent acquired the asset — which means any sale after inheriting is taxed at long-term capital gains rates, not short-term rates.¹

Three key mechanics:

1. All capital gain accrued during the decedent's lifetime disappears. It is not deferred — it is permanently eliminated. The heir's basis starts fresh at the date-of-death FMV.
2. Any growth after death is taxable. If an heir inherits stock at $200,000 and sells it two years later at $230,000, the $30,000 of appreciation after death is a taxable long-term capital gain.
3. Step-down applies to losses. If an asset has declined in value, the heir's basis is stepped down to the lower FMV. The decedent's unrealized loss is also permanently eliminated — neither party can deduct it. This makes it worth considering selling depreciated assets before death to capture the loss deduction on your own return.

What gets a step-up — and what doesn't

This is where many retirees are surprised. The assets in your retirement accounts — traditional IRAs, 401(k)s, 403(b)s — do not receive a step-up in basis. When your heirs inherit these accounts, every dollar they withdraw is taxed as ordinary income, just as it would have been for you. The 10-year rule under SECURE 2.0 forces distributions within 10 years for most non-spouse beneficiaries, and in many cases annual RMDs are required if you passed your required beginning date (T.D. 10001).

Community property states: the double step-up

Married couples in the nine community property states (Arizona, California, Idaho, Louisiana, New Mexico, Nevada, Texas, Washington, Wisconsin) have access to a substantial additional benefit: when one spouse dies, both spouses' shares of community property receive a step-up in basis to the date-of-death FMV. This is the "double step-up."

In common law (non-community property) states, only the deceased spouse's half of jointly held assets receives the step-up. The surviving spouse's half retains its original basis.

Some common law state couples have set up community property trusts — legal structures that reclassify assets as community property to capture the double step-up. As of 2026, Alaska, South Dakota, Tennessee, and Florida allow out-of-state couples to use such trusts under specific conditions. This is a sophisticated strategy that requires an estate attorney familiar with your state's laws.³

The gift vs. inherit decision: why timing matters

A common estate planning instinct is to give appreciated assets to family members now — either as annual exclusion gifts ($19,000 per recipient in 2026)² or as larger gifts using the lifetime exemption. But for highly appreciated assets, gifting can be a costly mistake compared to holding until death.

When you gift an appreciated asset, the recipient takes your carryover basis under IRC § 1015. If the stock you paid $10,000 for is now worth $200,000, and you give it to your child, their basis is $10,000. When they sell, they owe capital gains tax on the $190,000 gain.

When you hold the same asset until death, the $190,000 gain is permanently erased via the step-up. Your child's basis becomes $200,000 (or whatever the FMV is at death). Zero tax on the lifetime appreciation.

Exception where gifting makes more sense: If the recipient is in the 0% long-term capital gains bracket (taxable income under $49,450 single / $98,900 MFJ in 2026), they can sell the gifted asset tax-free at the federal level, regardless of the carryover basis. If your child has low income in a given year — early career, sabbatical, grad school — gifting appreciated shares and having them sell in that year can be more efficient than waiting for the step-up.

Step-down trap: If you gift an asset that has lost value, different basis rules apply under IRC § 1015(a). The recipient's basis for calculating gain is the donor's cost, but the basis for calculating loss is limited to the FMV at the time of gift. This prevents "double dipping" on losses. If you hold the asset until death, the step-down to FMV means neither you nor your heirs get to deduct the loss. Sell depreciated assets before death to capture the loss deduction on your own return.

Step-up in basis and the 2026 estate tax landscape

The One Big Beautiful Bill Act (OBBBA, July 2025) permanently raised the federal estate and gift tax exemption to $15 million per person ($30 million for married couples).⁴ The prior scheduled sunset back to roughly $7 million per person was eliminated.

For the vast majority of retirees, there is no estate tax exposure at all in 2026. This means the step-up in basis is now primarily an income tax planning tool — not an estate tax workaround. The goal is to minimize the capital gains tax burden on appreciated assets by holding them until death (eliminating the gain via step-up) rather than selling during your lifetime.

For very large estates approaching $15 million, the calculus is more nuanced: lifetime gifting can reduce the taxable estate, but at the cost of giving heirs carryover basis instead of a stepped-up basis. An estate attorney and financial advisor should model both paths for estates in this range.

Five planning strategies around the step-up

1. Hold highly appreciated taxable assets; draw down tax-deferred accounts first. If you have both a traditional IRA and a taxable brokerage with large unrealized gains, draw from the IRA first (or do Roth conversions) rather than selling appreciated securities. IRAs pass without a step-up; taxable accounts do. Minimizing the IRA balance maximizes the tax-efficient inheritance.
2. Use appreciated stock for charitable giving via a donor-advised fund or QCD. If you plan to leave money to charity, donate appreciated securities directly — you avoid the capital gain entirely, the charity pays no tax, and you get the full deduction. Alternatively, use a Charitable Remainder Trust (CRT) to convert concentrated appreciated stock into an income stream without immediate capital gain recognition. See our QCD guide for the IRA version.
3. Harvest losses before death; hold gains until death. Sell depreciated assets during your lifetime to capture the tax deduction. Hold appreciated assets — particularly positions with large embedded gains — until death to eliminate the gain via step-up. This is the foundational logic behind tax-gain/loss harvesting in retirement.
4. In community property states, retitle assets correctly. Assets titled as community property — not as separate property or joint tenancy — receive the double step-up. Work with an estate attorney to verify titling before the first spouse dies. Re-titling may be possible in some cases, but must be done correctly to avoid gift tax consequences.
5. Convert traditional IRAs to Roth during low-income years. Traditional IRA assets are the "worst" assets to pass on — no step-up, full ordinary income taxation for heirs. Roth IRAs are the "best" — distributions to heirs are tax-free. Roth conversions during the window between retirement and RMD age (typically 60–73) shift wealth from the worst bucket to the best, while also reducing future RMDs and the associated tax torpedo. See our tax minimization guide for the full framework.

Common mistakes to avoid

• Gifting appreciated stock instead of holding until death. For assets with large embedded gains, gifting triggers carryover basis and a future capital gains bill. Unless the recipient is in the 0% LTCG bracket, holding until death and letting the step-up eliminate the gain is usually better.
• Assuming IRAs get a step-up. They don't. Every dollar in a traditional IRA will be taxed as ordinary income when withdrawn by heirs. This is why a $1M Roth IRA is worth far more to your heirs than a $1M traditional IRA — even though both look equal on paper.
• Holding depreciated assets until death. The step-down rule eliminates the loss. Sell assets that have lost value during your lifetime to capture the tax deduction. Don't hold them hoping for recovery — if recovery happens after you die, the heirs still lose the loss deduction.
• Ignoring titling in community property states. If assets are titled as separate property or joint tenancy rather than community property, the double step-up may not apply. Verify titling with an estate attorney.
• Forgetting that annuity gains don't step up. Non-qualified annuities have embedded gain that doesn't disappear at death — heirs owe ordinary income tax on the gain portion. If you hold a highly appreciated annuity primarily for estate reasons, reconsider the strategy.

Sources

1. IRC § 1014 — Basis of property acquired from a decedent. The governing statute for the step-up in basis rule. FMV at date of death (or alternate valuation date per § 2032) becomes the heir's basis. Verified 2026.
2. IRS 2026 Tax Inflation Adjustments (IRS Newsroom). 2026 annual gift exclusion $19,000 per recipient; LTCG 0% threshold $49,450 single / $98,900 MFJ; 20% threshold $553,850 single / $613,700 MFJ per IRS Rev. Proc. 2025-32.
3. Kiplinger — Community Property Trusts for Married Couples. How common-law state couples can access the double step-up via community property trusts; states that allow it and requirements.
4. IRS — OBBBA 2026 Estate Tax Exemption. One Big Beautiful Bill Act (July 2025) permanently set estate/gift/GST exemption at $15M per person; eliminated the prior 2026 sunset. Verified July 2026.
5. Fidelity — What is a step-up in cost basis?. Overview of the step-up rule, carryover basis for gifts, and what types of accounts qualify.
6. Kitces — Step-Up in Basis, Gifting Between Spouses, and Estate Planning. Analysis of when holding for step-up outperforms gifting, the community property double step-up, and strategies for common law state couples.

Tax values verified against 2026 IRS guidance. IRC § 1014 step-up rules unchanged by OBBBA. OBBBA did permanently raise the estate/gift exemption to $15M and eliminate the 2026 sunset. Verified July 2026.