Step Up in Basis: Erasing Gains Through Inheritance

Key Takeaways

• Under IRC Section 1014, inherited property takes a new cost basis equal to its fair market value on the date of the decedent's death, erasing all capital gains that accrued during the owner's lifetime.
• The step-up is one of the largest tax expenditures in the US code; a stock bought for $1,000 and worth $500,000 at death passes to heirs with zero embedded taxable gain.
• Traditional IRAs and 401(k)s receive no step-up, heirs owe ordinary income tax on every dollar withdrawn, often compressed into a 10-year window under current rules.
• In community property states, both halves of jointly owned property receive a full step-up when one spouse dies, a significant advantage over common-law states where only the decedent's half steps up.

What It Is

Under Internal Revenue Code Section 1014, the basis of property acquired from a decedent is generally the fair market value (FMV) of that property on the date of the decedent's death. The estate can instead elect an alternate valuation date six months later, if doing so lowers the estate tax bill.

When the heir eventually sells the asset, capital gains tax is calculated from the stepped-up basis, not from what the original owner paid. Gains that accrued during the decedent's lifetime therefore escape income tax entirely.

The Intuition

Imagine your grandfather bought 100 shares of a stock in 1975 for $1,000. By the time he dies in 2025, those shares are worth $500,000. If he had sold them the day before he died, he would have owed long-term capital gains tax on a $499,000 gain.

Instead, he leaves them to you. Your cost basis becomes $500,000, the FMV on his date of death. Sell them the next week at $500,000 and you owe zero capital gains tax. Sell them a year later at $520,000 and you owe tax only on the $20,000 you gained.

The policy justification is partly administrative (tracking original basis across decades is hard) and partly a trade-off with the federal estate tax. The practical effect is one of the largest tax expenditures in the US tax code.

How It Works

What qualifies

Step-up applies broadly to capital assets held by the decedent: publicly traded stocks, mutual funds, ETFs, real estate, private business interests, collectibles, and most other property reported on the estate inventory.

What does not qualify

• Traditional IRAs, 401(k)s, and other tax-deferred retirement accounts. Beneficiaries pay ordinary income tax on withdrawals at their own rate. There is no basis step-up on the balance.
• Annuities. The gain portion remains taxable as ordinary income to the beneficiary.
• Gifts given during the decedent's lifetime. Lifetime gifts use carryover basis, not step-up.
• Appreciated property gifted to the decedent within one year of death and then inherited back. IRC 1014(e) blocks the step-up in that case.

Community property

In community property states (California, Texas, Arizona, and others), when one spouse dies, both halves of the community property receive a full step-up, not just the decedent's half. This is a significant advantage over common-law states, where only the decedent's half steps up.

Estate tax coordination

For very large estates above the federal estate tax exemption, the property may be subject to estate tax at the decedent's death. The heir still gets the step-up. Estate tax and capital gains tax are separate layers.

Worked Example

Ellen inherits a rental house from her mother. Her mother bought the house in 1988 for $120,000. It is worth $850,000 at the date of death. Over the years, her mother took $80,000 of depreciation, bringing the adjusted basis to $40,000.

Without step-up (if Ellen's mother had sold and gifted the cash): taxable gain on sale would be $850,000 minus $40,000 equals $810,000, with depreciation recapture and long-term capital gains tax on top.

With step-up: Ellen's basis becomes $850,000, the FMV on the date of death. Depreciation history is wiped as well. If Ellen sells two years later at $890,000, her taxable gain is just $40,000.

Common Mistakes

1. Gifting appreciated assets during life instead of waiting. Giving stock to children during your lifetime passes your original cost basis to them. They still owe the full capital gains tax on sale. Holding until death delivers the basis step-up and erases the embedded gain.

2. Forgetting retirement accounts are excluded. Families sometimes assume that because the brokerage account got a step-up, the Traditional IRA did too. It did not. Beneficiaries owe ordinary income tax as they withdraw, often compressed into a 10-year window under current rules.

3. Skipping the date-of-death valuation. The executor is expected to document the FMV on the date of death (or alternate valuation date) for each asset. Without good records, the IRS default position is that basis equals zero. That is an expensive default.

4. Ignoring the community property advantage. Couples in common-law states sometimes overlook strategies such as titling certain assets through trusts designed to obtain a full step-up on first death. In community property states, the double step-up is automatic for community property.

5. Holding low-basis assets you should sell. Step-up is a powerful reason to avoid selling highly appreciated assets late in life, even when rebalancing argues for a sale. The tax savings at death may dwarf the portfolio benefit of trimming.

Frequently Asked Questions

Q: What is step up in basis in simple terms? When you inherit an asset, the IRS treats your cost as the market value on the date the previous owner died, not what they originally paid. Any gain that built up over their lifetime disappears for tax purposes. If you sell shortly after inheriting at roughly that value, you owe little or no capital gains tax.

Q: How does step up in basis affect investment decisions? It creates a powerful reason to hold highly appreciated assets until death rather than selling and gifting the cash. Gifting stock during life passes the original low basis to the recipient, who still owes the full capital gains tax on sale. Holding to death wipes that gain entirely.

Q: What is a real-world example of step up in basis? Your grandfather paid $1,000 for stock in 1975, now worth $500,000. He holds until death. You inherit with a $500,000 basis. Sell the next week at $500,000, no capital gains tax. If he had sold the day before death, he would have owed tax on a $499,000 gain.

Q: How can investors use step up in basis in portfolio planning? Hold low-basis, highly appreciated positions rather than rebalancing or gifting them during life. Use them for large estate gifts rather than cash. In community property states, consider titling strategies that ensure both halves of jointly held property step up at first death.

Q: How is step up in basis different from carryover basis on gifts? A step-up at death resets basis to current fair market value. A lifetime gift uses carryover basis, the original owner's cost travels with the shares to the recipient. The recipient still owes capital gains tax on the entire original appreciation when they sell, which is why receiving appreciated stock as a gift is far less tax-efficient than inheriting it.

Sources

1. Internal Revenue Service. "Publication 551, Basis of Assets." https://www.irs.gov/publications/p551
2. Internal Revenue Service. "Topic no. 703, Basis of Assets." https://www.irs.gov/taxtopics/tc703
3. Internal Revenue Service. "Gifts and Inheritances FAQ." https://www.irs.gov/faqs/interest-dividends-other-types-of-income/gifts-inheritances/gifts-inheritances
4. U.S. Department of the Treasury, Office of Tax Analysis. "Tax Expenditures FY2025." https://home.treasury.gov/system/files/131/Tax-Expenditures-FY2025.pdf

Disclaimer

This article is educational content only and is not financial, tax, or legal advice. Step-up rules, estate tax thresholds, and state-level property laws vary and change over time. Inherited assets involve both tax and probate considerations that depend on personal circumstances. Consult a licensed tax professional, estate attorney, or financial advisor before making inheritance-related decisions.