When a person inherits a house or a block of stock, the taxable clock on decades of gains usually resets to zero. The step-up in basis rule treats inherited property as though the heir had bought it at its value on the day the original owner died, so the appreciation that piled up over the owner’s lifetime escapes capital-gains tax entirely. It is one of the largest and least understood breaks in the tax code, and it quietly shapes how families should think about selling, gifting, or simply holding an appreciated asset.
The date-of-death value replaces the original cost
Capital-gains tax is charged on the difference between what an asset sold for and its “basis” — normally the price the owner paid. For inherited property, the IRS resets that basis. According to IRS Publication 551, Basis of Assets, the basis of property acquired from someone who has died is generally its fair market value on the date of death. The effect can be dramatic. A parent who bought a house for $60,000 decades ago and left it worth $400,000 passes it to a child whose basis becomes $400,000; if the child sells soon after for $410,000, the taxable gain is $10,000, not $350,000. The lifetime appreciation simply vanishes from the tax calculation.
The same reset applies to individual stocks, bonds, mutual funds, and other property that carries an unrealized gain. Fair market value is fixed as of the date of death — a real-estate appraisal for a home, the trading price for publicly held shares — and that figure becomes the number every future gain or loss is measured against.
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What steps up, and the big exception that does not
Most assets that pass through an estate qualify: a primary home, a vacation property, brokerage-account holdings, and interests in a private business all receive the stepped-up basis. There is one costly exception that catches many heirs off guard. Traditional retirement accounts — pretax IRAs, 401(k)s, and similar plans — do not get a step-up. The IRS treats them as “income in respect of a decedent,” meaning the money was never taxed during the owner’s life, so the heir owes ordinary income tax on withdrawals regardless of how long ago the account was funded. A $500,000 traditional IRA left to a child is fully taxable as it comes out; a $500,000 brokerage account left to the same child is stepped up and can often be sold with little or no gain. Two inheritances of identical size can carry wildly different tax bills depending on the type of account.
The IRS guidance on gifts and inheritances reinforces the divide, and it explains why the character of an inherited asset matters at least as much as its dollar value.
Why the timing of a sale or a gift changes everything
The step-up rewards patience, and it penalizes two common instincts. Selling an appreciated asset before death forfeits the reset: the original owner realizes the full gain and pays the capital-gains tax, leaving heirs with cash instead of a stepped-up asset. Giving the asset away during life is worse for tax purposes. A lifetime gift generally carries over the donor’s original basis to the recipient, so a parent who deeds an appreciated home to a child while still living hands over the built-in gain along with the house — the child inherits the parent’s low basis and the tax bill that comes with it. The child who instead receives the same home through the estate gets the date-of-death value and, usually, no taxable gain on a prompt sale.
That contrast makes the step-up a central consideration for older homeowners and long-term investors deciding what to do with an asset they no longer need. Selling a low-basis holding to raise cash, or transferring it to the next generation early, can trade a tax-free inheritance for a taxable event. Holding the asset and letting it pass at death — now that the federal estate tax reaches only the wealthiest estates — often keeps the appreciation out of the tax system entirely. The rule turns a decision that feels like simple estate housekeeping into one with a real dollar figure attached.
How marriage and state law change the reset
For married couples, the size of the reset can depend heavily on state law. In the nine community-property states — a group that includes California, Texas, and Washington — the death of one spouse steps up the basis of an entire community-property asset, not just the deceased spouse’s half. A couple that jointly owns a long-held rental or brokerage account in one of those states can see the full built-in gain erased when the first spouse dies, a far larger benefit than couples in common-law states receive. In most common-law states, only the deceased owner’s share of jointly held property steps up, leaving the survivor’s half sitting on its original cost.
The reset also runs in both directions. If an asset is worth less on the date of death than the owner paid for it, the basis steps down to that lower value, wiping out a loss that might otherwise have sheltered future gains — a reason heirs sometimes inherit a smaller tax advantage than expected. One feature quietly helps in every state: inherited property is automatically treated as long-term for capital-gains purposes regardless of how quickly it is sold, so a beneficiary who sells within days of inheriting still pays the lower long-term rate on any gain above the stepped-up figure.
This article was produced with the assistance of artificial intelligence and reviewed by The Financial Wire editorial team.
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