When you inherit a stock, house, or mutual fund, the IRS essentially wipes out the capital gains tax that accumulated during the original owner's lifetime. That tax forgiveness is called the step-up in basis, and it's one of the most powerful wealth transfer tools available. Yet most people never plan for it. They sell assets during their lifetime, triggering unnecessary taxes, or they hold the wrong assets and pass along a hidden tax bomb to their heirs. This guide explains exactly how the step-up works, which assets qualify, and how to structure your portfolio to maximize the benefit for your family.
The concept is simple but often misapplied. When you buy an asset, your cost basis is what you paid for it. If you sell it later, you pay capital gains tax on the difference between the sale price and your cost basis. But when you die and leave that asset to an heir, the tax code resets the cost basis to the asset's fair market value on the date of your death (or an alternative valuation date six months later).
Suppose your grandmother bought 100 shares of Procter & Gamble in 1990 for $5,000. At her death in 2025, those shares are worth $45,000. If she sold them before dying, she'd owe tax on the $40,000 gain. But when you inherit them, your cost basis steps up to $45,000. If you sell the next day for $45,000, you owe zero capital gains tax. If you sell a year later for $50,000, you owe tax only on the $5,000 post-inheritance gain.
The step-up effectively erases all the appreciation that occurred during the decedent's lifetime. This is why financial advisors often say "die with your winners" — holding appreciated assets until death allows your heirs to sell them tax-free, at least on the pre-death gains.
Not all inherited property receives a basis adjustment. Understanding the distinction prevents costly mistakes.
Assets held in traditional IRAs, 401(k)s, 403(b)s, and other tax-deferred retirement accounts do NOT get a step-up in basis. Instead, beneficiaries must pay ordinary income tax on the full value of withdrawals (except for the portion representing post-tax contributions in a Roth account). Similarly, annuities held inside retirement accounts follow the same rules. Tax-free municipal bonds also do not qualify because they already carry tax advantages.
Also excluded: property that the decedent had already gifted during their lifetime. If your grandmother gave you those Procter & Gamble shares as a gift three years before her death, your basis is her original $5,000 cost, not the date-of-gift value. Gifts carry over the donor's basis; only assets transferred through an estate receive the step-up.
Many retirees sell long-held stocks or a vacation home to "simplify" their finances or to generate cash for spending. That sale triggers capital gains tax that could have been eliminated entirely if the asset passed through their estate.
Consider a married couple in their late 70s with a rental property purchased in 1985 for $150,000. The property is now worth $1.2 million. If they sell, they pay 20% federal capital gains tax (plus the 3.8% net investment income tax if their income exceeds $250,000) on roughly $1.05 million of gain — a tax bill of approximately $250,000. If they instead hold the property until the second spouse dies, their heirs inherit it with a basis of $1.2 million and can sell immediately with no capital gains tax.
The trade-off is that the couple must continue to manage the property or pay for management, and they miss the liquidity from the sale. But for many families, the tax savings dwarf the inconvenience. Before selling any asset with large unrealized gains, run the numbers on what the tax cost would be versus what your heirs would pay if you held it.
A little-known rule called portability allows a surviving spouse to inherit the unused portion of a deceased spouse's estate tax exemption. But step-up in basis works differently for married couples. When one spouse dies, all jointly held property (like a house owned as tenants by the entirety) generally receives a full step-up in basis on the deceased spouse's half. The surviving spouse's half retains its original basis.
Here is where planning matters. If assets are held as community property in nine U.S. states (Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, Wisconsin), both halves of the property receive a step-up to the date-of-death value upon the first spouse's death. In a community property state, that $1.2 million rental property would get a full step-up to $1.2 million on both halves when one spouse dies, meaning the surviving spouse could sell immediately with zero capital gains tax.
In non-community-property states, only half the basis steps up. The surviving spouse keeps a carryover basis on their half. If the property was originally $150,000 and the halves are equal, the stepped-up half becomes $600,000 (half of $1.2 million), and the other half stays at $75,000. The blended basis is $675,000. If the surviving spouse sells for $1.2 million, they owe tax on a $525,000 gain — still substantial.
If you live in a non-community-property state and hold significant jointly owned appreciated assets, consider retitling them as community property or using a trust that can mimic the effect. Consult an estate attorney before making changes.
One of the most common mistakes well-meaning parents make is gifting appreciated assets to adult children during their lifetime. The child receives the asset with a carryover basis — the parent's original cost — not a step-up. If the child sells, they pay the parent's deferred capital gains tax plus any additional appreciation.
Example: A father bought Apple stock in 2010 for $10,000. In 2025, it's worth $200,000. He gifts the shares to his daughter to help with a down payment on a house. Her basis is $10,000. She sells for $200,000 and owes capital gains tax on $190,000 — roughly $38,000 at the 20% rate. Had he held the shares until death, she would have inherited them at a $200,000 basis and paid zero tax on the gain.
If you want to help a child or grandchild financially, consider gifting cash instead of appreciated securities. Sell the appreciated asset yourself, pay the tax, and give the after-tax proceeds. You'll lose some to taxes, but the child receives more certainty. Alternatively, use a trust structure that allows the asset to remain in the estate until your death, then distributes the stepped-up basis to heirs.
The step-up in basis is separate from the estate tax, but the two interact in your overall plan. The federal estate tax exemption in 2025 is approximately $13.99 million per individual (adjusted annually for inflation). Married couples can combine exemptions using portability to shield up to $28 million from estate tax. Estates above that threshold pay a 40% tax on the excess.
If your estate is likely to exceed the exemption, the step-up in basis becomes less relevant because estate taxes may consume much of the wealth. In that case, you might prefer to gift assets during your lifetime to reduce the taxable estate (using your annual gift tax exclusion of $19,000 per recipient in 2025, or your lifetime exemption). But gifting loses the step-up. You must decide which tax is more damaging: a 40% estate tax on the full value or capital gains tax on the appreciation.
For most families — those with estates under the federal exemption — the step-up in basis is far more valuable than estate tax avoidance. You should generally avoid making large gifts of highly appreciated assets that could instead pass through your estate with a tax-free basis adjustment.
Building a plan around the step-up requires intentional portfolio and estate structuring. Here are concrete actions you can take this year:
Much of the current tax law — including the high estate tax exemption — is set to expire at the end of 2025 under the Tax Cuts and Jobs Act sunset provisions. Unless Congress acts, the estate tax exemption will revert to roughly $6.8 million per person in 2026 (adjusted for inflation), and top marginal income tax rates will increase.
Importantly, the step-up in basis rules are part of the Internal Revenue Code and are not directly tied to the sunset provisions. They are unlikely to be eliminated in any tax reform because they affect millions of middle-class families and carry significant political support. However, there have been proposals in past budget discussions to cap the step-up at $1 million in gains or to limit it to assets held for a minimum period. While none have become law, it is wise to stay informed. For 2025 and 2026 planning, assume the step-up is intact, but avoid strategies that lock you into an irreversible course of action if the rules change.
Begin by reviewing the assets you plan to leave to children or charities. Calculate the embedded gains and the tax that would be due if you sold today. Then ask yourself: is there a reason to sell — such as generating income you need, or diversifying an overconcentrated holding — that justifies burning the step-up advantage? If the answer is no, hold the asset and let the tax code work in your family's favor. The step-up is not a loophole you need to manufacture; it is a rule you simply need to avoid sabotaging.
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