Step-Up in Basis: How It Reduces Taxes When You Inherit Assets

The step-up in basis is one of the most significant — and most underappreciated — tax benefits in U.S. tax law. It can eliminate capital gains taxes on decades of investment appreciation when assets are passed through an estate. Understanding it is essential for both estate planning and for heirs who inherit assets.

How Capital Gains and Basis Work

When you sell an asset for more than you paid for it, the difference is a capital gain — and it's subject to capital gains tax. The amount you originally paid is called your "cost basis." The taxable gain is the sale price minus the basis.

Example without a step-up: Your parent bought Apple stock for $5,000 in 1995. It's now worth $150,000. If they sell it, they owe capital gains tax on $145,000 of gain. At the 20% long-term capital gains rate, that's $29,000 in taxes.

What the Step-Up Does

When an asset is inherited at death, the heir's cost basis is "stepped up" to the asset's fair market value on the date of death — regardless of what the original owner paid. This effectively wipes out the capital gains that accumulated during the deceased's lifetime.

Example with a step-up: Your parent owned that same Apple stock, now worth $150,000. They die. You inherit it with a stepped-up basis of $150,000. If you sell immediately, you owe zero capital gains tax. If you hold it and sell for $160,000, you only owe tax on the $10,000 of gain that accrued after you inherited it.

The $145,000 of gain your parent accumulated over 30 years? Gone — never taxed.

When the Step-Up Applies

The step-up applies to assets that:

Were included in the deceased's taxable estate
Pass by inheritance (at death) — not by lifetime gift
Are capital assets that can appreciate in value

Common assets that receive a step-up: stocks and mutual funds in taxable brokerage accounts; real estate (including the primary home); business ownership interests; collectibles, art, and valuables.

When the Step-Up Does NOT Apply

Retirement accounts

Traditional IRAs, 401(k)s, 403(b)s, and other tax-deferred retirement accounts do not receive a step-up in basis. These accounts were never taxed on the way in (for pre-tax contributions), so they carry the original deferred tax liability. Heirs who inherit these accounts owe income tax on withdrawals — just as the original owner would have.

Lifetime gifts

Assets given as gifts during the donor's lifetime carry a "carryover basis" — the heir's basis is the same as the donor's original basis, not the value at the time of the gift. This is a major tax trap: if you receive a highly appreciated stock as a gift and later sell it, you owe capital gains on the full appreciation since the donor originally bought it. This is why planning advice often includes: don't gift highly appreciated assets during your lifetime — leave them in your estate to get the step-up.

Irrevocable trusts (with exceptions)

Assets removed from the taxable estate through irrevocable trusts may not receive a step-up, depending on the trust structure. Some irrevocable trusts are structured specifically to retain estate inclusion — and thus step-up eligibility — while still providing other benefits.

The Community Property Advantage

In community property states (California, Texas, Arizona, and others), both halves of community property receive a step-up when one spouse dies. This "double step-up" is a significant tax advantage compared to common-law property states where only the deceased spouse's half is stepped up. Married couples in common-law states with highly appreciated jointly owned real estate should discuss whether community property treatment might be advantageous.

Planning Implications

The step-up in basis has important estate planning implications:

Hold appreciated assets in your estate rather than gifting them, to preserve the step-up benefit for heirs
Consider which assets to give vs. bequest: Gift assets with high basis (little appreciation) and leave high-appreciation assets to heirs at death
Review asset location between taxable accounts (get step-up) and IRAs (no step-up)
Document asset values at death — the stepped-up basis needs to be documented for future tax purposes

Related Guides

Frequently Asked Questions

What is a step-up in basis?

When you inherit an asset — stocks, real estate, a business interest — its cost basis for capital gains tax purposes is "stepped up" to its fair market value on the date of the original owner's death. The original owner's cost basis (what they paid for the asset) is irrelevant; the heir's new basis is the date-of-death value. Example: your parent bought stock for $10,000 thirty years ago. At their death, it's worth $200,000. If they had sold it during their lifetime, they would have owed capital gains tax on $190,000 of gain. But you inherit it with a basis of $200,000. If you sell it immediately for $200,000, you owe no capital gains tax at all. If you hold it and sell when it's worth $220,000, you only pay capital gains tax on the $20,000 of appreciation that occurred after you inherited it. This step-up in basis effectively eliminates the tax on decades of capital gains accumulated during the original owner's lifetime.

Does the step-up in basis apply to all inherited assets?

The step-up in basis applies to assets that were included in the deceased person's taxable estate and that pass by inheritance (at death) rather than by gift during the person's lifetime. It applies to: individually owned stocks, bonds, and investment accounts; real estate; business interests; collectibles and other appreciated property. It does NOT apply to: assets in traditional IRAs, 401(k)s, and other tax-deferred retirement accounts (these pass with the original tax deferral intact — heirs owe income tax when they take distributions); assets that were given as gifts during the person's lifetime (lifetime gifts carry over the donor's original basis, not a step-up — a major reason not to gift highly appreciated assets during your lifetime if you could instead leave them at death); and property held in an irrevocable trust that removes assets from the taxable estate may lose the step-up benefit, depending on the trust structure.

What is the step-up in basis for jointly owned property?

For jointly owned property, the step-up treatment depends on the type of joint ownership and the state. For joint tenancy with right of survivorship (the most common form between spouses): in most states (common law property states), only the deceased co-owner's half of the property receives a step-up; the surviving spouse's half retains its original basis. In community property states (California, Texas, Arizona, Nevada, Washington, Idaho, New Mexico, Louisiana, Wisconsin, and Alaska with a community property agreement), a special rule applies: when one spouse dies, BOTH halves of community property receive a step-up to the date-of-death fair market value — a significant tax advantage. Married couples in common-law property states sometimes consider converting separate property to community property to obtain the double step-up, particularly for highly appreciated real estate — consult a tax attorney before doing so.