The Step-Up in Basis at Death: Why It Matters More Than Most People Think

What Is "Basis" and Why Does It Matter?

In tax terms, "basis" is the cost of an asset for purposes of calculating capital gains when it is sold. When you buy a stock for $10,000, your basis is $10,000. If you sell it years later for $60,000, your capital gain is $50,000, and you owe taxes on that gain. The same principle applies to real estate, mutual funds, and other capital assets.

Over time, as assets appreciate in value, the gap between the original basis and the current market value grows wider. For a family that bought a home in 1990 for $150,000 that is now worth $600,000, the unrealized capital gain is $450,000. If they sell the home (after accounting for exemptions and adjustments), they may owe significant capital gains tax on that appreciation.

How the Stepped Up Basis Works

When a person dies, the tax code provides that the basis of their assets is "stepped up" to the fair market value on the date of death. This means that all of the appreciation that occurred during the deceased person's lifetime is wiped out for tax purposes. The heirs inherit the asset with a new, higher basis equal to its current value.

Using the example above: if the homeowner dies when the home is worth $600,000, the heirs inherit the home with a basis of $600,000 — not $150,000. If they sell the home for $600,000, their capital gain is zero. The $450,000 in appreciation is never taxed.

A Real-World Example With Numbers

Consider a parent who purchased 1,000 shares of a stock in 2000 for $20 per share — a total cost of $20,000. By 2026, the stock has grown to $150 per share, with a total value of $150,000. The unrealized capital gain is $130,000.

If the parent sells during their lifetime: They owe capital gains tax on $130,000. At the current federal long-term capital gains rate of 15%, that is $19,500 in federal tax alone (plus any applicable state tax and the 3.8% net investment income tax for higher earners).

If the parent holds until death: The heirs inherit the stock with a stepped up basis of $150,000. If they sell immediately, the capital gain is zero. The $19,500+ in taxes simply disappears.

What Does Not Get a Step-Up

Not all assets qualify for the stepped up basis. The most significant exclusion is retirement accounts. IRAs, 401(k)s, 403(b)s, and similar tax-deferred accounts do not receive a step-up in basis. Distributions from inherited retirement accounts are taxed as ordinary income to the beneficiary — the same way they would have been taxed to the original owner. Under the SECURE Act, most non-spouse beneficiaries must also withdraw the entire balance within 10 years of the original owner's death.

Other assets that do not receive a step-up include items that were gifted during the owner's lifetime (they carry over the donor's original basis), income in respect of a decedent (IRD items such as unpaid salary, accrued interest, or annuity payments), and certain assets held in irrevocable trusts that are not included in the decedent's taxable estate.

The Gift vs. Inheritance Trap

One of the most expensive mistakes families make is gifting appreciated assets during their lifetime instead of holding them until death. When a person gifts an asset, the recipient takes the donor's original cost basis — called a "carryover basis." The appreciation is preserved, and the recipient will owe capital gains tax when they eventually sell.

If the same asset is held until the owner's death, the heir receives a stepped up basis, and the appreciation is never taxed. This is why the general planning principle is: gift cash, hold appreciated assets. The step-up at death is too valuable to forfeit voluntarily.

Trusts and the Step-Up

Property held in a revocable living trust generally receives a full step-up in basis at the grantor's death, because the trust's assets are included in the grantor's taxable estate. For most families, transferring assets to a revocable trust does not affect the step-up.

Property held in an irrevocable trust may or may not receive a step-up, depending on the trust's structure. If the trust is structured so that the assets are included in the grantor's estate (certain retained powers or interests), the step-up applies. If the assets are fully outside the grantor's estate — which is often the goal for asset protection and estate tax purposes — the step-up may be lost. This is a critical planning tradeoff that must be evaluated with professional guidance.

The Bottom Line

The stepped up basis at death is one of the most powerful tax benefits available to American families. It eliminates capital gains on appreciated assets that have been held until the owner's death, potentially saving heirs tens or hundreds of thousands of dollars. Understanding which assets qualify, which do not, and how gifts and trusts affect the step-up is essential for anyone building an estate plan. The rules are not complicated, but the stakes are high — and getting them wrong is expensive.