When you inherit stocks, real estate, or other assets, you don’t inherit the original owner’s tax bill. Thanks to the “step-up in basis,” your cost basis resets to the asset’s value at the date of death, potentially wiping out years of capital gains tax.
How the step-up works
“Basis” is what you paid for an asset; capital-gains tax applies to the profit above basis. Normally, if you buy stock for $10,000 and sell for $50,000, you owe tax on $40,000. But if you inherit that stock when it’s worth $50,000, your basis “steps up” to $50,000. Sell immediately for $50,000 and you owe zero tax.
An example with numbers
Your parent bought a house for $200,000 decades ago. At death, it’s worth $800,000. Without the step-up, selling would trigger tax on $600,000 of gain. With the step-up, your basis is $800,000, so selling for $800,000 produces no taxable gain at all. This single provision saves heirs billions every year.
Step-up vs. carryover: the gifting trap
Here’s the critical distinction. Assets you inherit get a step-up to fair market value at death. Assets gifted to you during the giver’s lifetime carry over the giver’s original basis. If your parent gifts you that $200,000 house (now worth $800,000) and you sell it, you owe tax on the full $600,000 gain. If you inherit it instead, you owe nothing. Well-meaning parents who gift appreciated property to “help out” can accidentally hand their kids a massive tax bill. When in doubt, inherit, don’t gift.
A worked example: the $142,800 gain that vanishes
Take the $200,000 house now worth $800,000. The $600,000 gain, if taxed, would face the 20% federal capital-gains rate plus the 3.8% net investment income tax: 23.8% of $600,000, or $142,800. With the step-up, that entire $142,800 liability disappears. The heir can sell the next day and keep every dollar. No other single tax provision does more for middle-class heirs, which is why estate planners obsess over preserving it.
Why it matters for estate planning
The step-up is a powerful reason to hold appreciated assets until death rather than selling during life. It also means gifting appreciated assets before death is usually worse than letting heirs inherit them, since gifts carry over your original basis, but inheritances get the step-up. This is one of the biggest “free lunches” in the tax code.
Community property: the double step-up
In community property states (California, Texas, Arizona, and a handful of others), married couples get an even better deal: when one spouse dies, both halves of community property receive a step-up, not just the deceased spouse’s half. In common-law states, only the decedent’s half steps up. If you live in a community property state and hold appreciated assets jointly, this double step-up can save the surviving spouse hundreds of thousands in future capital-gains tax.
Three step-up mistakes
First, gifting appreciated assets instead of letting heirs inherit them, which swaps a step-up for carryover basis. Second, adding a child to a property deed as a joint tenant to “avoid probate.” That can be treated as a part-gift, costing the child part of the step-up. Third, failing to document basis. If the IRS questions the stepped-up value, a date-of-death appraisal is your proof. Get one for real estate; for stocks, save the statements showing values at death.
What doesn’t get a step-up
Retirement accounts (IRAs, 401(k)s) don’t get a step-up, since heirs owe income tax on withdrawals. Assets in certain trusts may or may not qualify depending on the structure. And probate doesn’t affect the step-up; it’s available whether assets pass through probate or a trust. For more on keeping taxes low, see our review of Be Smart Pay Zero Taxes.
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