Step-Up in Basis vs Carryover Basis

When you inherit an asset, its tax cost typically resets to its market value on the date of death—a “step-up in basis” that wipes out built-in gains. When you receive a gift of the same asset during the donor’s lifetime, you inherit the donor’s original cost—a “carryover basis” that preserves the tax obligation. This distinction is one of the most powerful drivers of intergenerational wealth transfer strategy.

How the Step-Up in Basis Works

When someone dies, the IRS values their estate as of the date of death (or six months later if the executor elects). Any inherited asset—a house, a stock portfolio, a business stake—gets assigned a new tax basis equal to that fair-market value. If the deceased bought Apple shares for $50 and they were worth $500 at death, the heir’s basis becomes $500, not $50.

The consequence: those $450 in appreciation vanish from a tax perspective. The heir can sell immediately at $500 and owe zero capital gains tax. The built-in gain is permanently forgiven.

This applies across all asset classes. Real property is the most obvious case—a rental building bought in 1985 for $200,000 and worth $2 million at the owner’s death steps up to $2 million in basis. Stocks, mutual funds, even cryptocurrency holdings all receive the same reset. The only hard exclusion is items properly classified as a “right to a future cash flow” like certain installment contracts.

The Carryover Basis Rule and Gifting

When you give an asset during your lifetime, the recipient takes your basis—the original cost to you, not its current value. That is carryover basis. If you bought stock for $10,000 and it’s now worth $50,000, and you gift it, your recipient’s basis is $10,000. When they sell for $50,000, they owe capital gains tax on the $40,000 gain.

The donor incurs no tax on the gift itself (gifts are generally not taxable income to the recipient), but the carryover basis is a deferred tax liability. It moves the burden forward to the donee and locks in their cost basis at the donor’s historical price.

This creates a sharp contrast with inheritance. Gifting, which feels generous and wealth-enhancing during life, paradoxically leaves the recipient with a larger embedded tax liability than if they had simply waited to inherit the same asset.

Why This Matters for Planning

The step-up is a major factor in the decision between gifting now and passing at death. A parent with significant unrealized gains faces this calculus:

Gifting now: Removes the asset from the estate (helpful if the estate is large enough to trigger estate tax), but saddles the child with carryover basis and future capital gains tax.

Passing at death: The estate may pay federal or state estate taxes (depending on thresholds), but the heir gets a basis reset and avoids income tax on the appreciation entirely.

For many middle-income and high-income estates, the math favors passing appreciated assets at death. The step-up wipes out a larger tax liability than the estate tax (if any) would have created. In 2024, the federal estate tax exemption is $13.61 million per person; estates below that threshold pay zero federal estate tax but still receive the step-up. Even above that threshold, the income tax avoided by the step-up often exceeds the estate tax owed.

Gifting makes more sense if the donor wants to reduce an oversized estate, if appreciated assets are expected to appreciate further (making carryover basis less painful relative to what might be inherited later), or if the donor prioritizes giving money while alive to see the benefit firsthand.

State and International Variations

Not all jurisdictions follow the federal step-up rule. A few states—notably North Carolina and South Carolina—have carryover basis rules for state income tax purposes, meaning residents face income tax on inherited gains even if the federal return is clean. Some international tax systems use carryover basis universally or hybrid approaches.

Foreign-source property owned by non-residents often does not receive a step-up under U.S. law, creating complications for expatriates and immigrants with property overseas. Professional guidance is essential in these cases.

The “Floating Basis” Trap

Some donors attempt to thread the needle by gifting appreciated assets but retaining some control or benefit—for instance, gifting a house but living in it rent-free, or gifting stock but maintaining voting rights. The IRS scrutinizes these arrangements closely. If the donor retains significant rights, the IRS may argue the asset is still part of the estate for estate tax purposes, meaning the donor pays estate tax and the recipient gets carryover basis—the worst of both worlds.

Techniques like grantor retained annuity trusts or intentionally defective grantor trusts are designed to gift appreciation while the grantor survives, but they involve complex IRS rules and require proper documentation.

Timing Considerations Near Death

An edge case emerges when a donor is ill and aware death is imminent. Some practitioners have advised clients to sell appreciated assets before death, take the capital gains tax hit, and then pass the sale proceeds (which have no unrealized gains) to heirs. The outcome is a capital gains tax bill now rather than forgiven later, but if the sale proceeds are large relative to the estate and carryover basis, it might reduce overall taxation. This is highly fact-specific and should never be undertaken without professional tax counsel.

Long-Term Planning Implications

The step-up vs carryover distinction shapes broader decisions about wealth structure. It influences whether to hold appreciated assets at death (to capture the step-up), whether to place appreciated assets in revocable trusts (which still get the step-up), and whether family business stakes should be gifted or passed at death.

It also creates an incentive to avoid selling appreciated assets during life if possible, since doing so triggers capital gains tax immediately. This can lock people into concentrated positions or under-diversified portfolios, especially in family businesses or inherited real estate.

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