The Step-Up in Basis: The Most Valuable Provision Most Retirees Have Never Heard Of

I want to tell you about a provision of the tax code that reduces federal tax revenue by an estimated $41 billion per year. It has been in place since 1921. Congress has tried to repeal it multiple times and failed every time. It is available to anyone who holds appreciated assets until death.

Most people who could benefit from it have never heard of it.

It’s called the stepped-up cost basis. And if you have a taxable investment portfolio — stocks, funds, real estate, business interests held outside a retirement account — it may be the most valuable financial planning concept you’re not using.

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What it actually does

When you buy an investment, the price you pay becomes your cost basis. When you sell, you owe capital gains tax on the difference between what you paid and what you received. That’s the basic rule, and most investors understand it.

Here’s the part most people miss: when you die and leave appreciated assets to your heirs, the cost basis doesn’t transfer with the asset. It resets.

Under IRC Section 1014, assets inherited at death receive a new basis equal to the fair market value on the date of death. The decades of appreciation — all of it — is wiped clean for tax purposes.

Say you bought shares of stock in 1995 for $20,000. Today they’re worth $300,000. If you sell today, you owe capital gains tax on $280,000 of gain. At federal rates of up to 20 percent plus the 3.8 percent net investment income surtax — and whatever your state adds on top — that’s a substantial tax bill.

If instead you hold those shares until death and leave them to your heirs, the basis resets to $300,000. Your heirs could sell immediately and owe nothing on that $280,000 of gain. It vanished. The IRS effectively forgave it.

That’s not a loophole. That’s not aggressive tax planning. That’s how the law works, and it’s been working that way for over a hundred years.

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What qualifies — and what doesn’t

What gets the step-up: – Stocks, bonds, and mutual funds held in taxable brokerage accounts – Real estate held in your name or in a revocable living trust – Business interests passed through your estate – Foreign assets — Section 1014 applies internationally, not just to U.S. holdings – Assets held in a revocable living trust, because those remain part of your taxable estate

What doesn’t: – IRAs, 401(k)s, and other tax-deferred retirement accounts — these are governed by a different section of the tax code and don’t receive a step-up. Heirs who inherit an IRA pay ordinary income tax on distributions, not capital gains tax. – Assets you gifted during your lifetime — when you give an appreciated asset away while you’re alive, the recipient inherits your original cost basis, not the current value. The tax bill travels with the gift. – Assets held in an irrevocable trust that removed them from your estate — once out of the estate, they’re out of the step-up calculation.

The distinction between taxable accounts and retirement accounts is one of the most consequential in estate planning. It argues strongly for a deliberate strategy about which accounts to draw from during retirement and which to preserve for transfer — a conversation worth having with your advisor before you start making withdrawal decisions.

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The married couple difference: community property vs. common law

Here’s where it gets particularly relevant for snowbirds, who often own property in multiple states.

The United States operates under two different property ownership systems for married couples. Nine states — Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin — are community property states. Every other state is a common law (or separate property) state.

The difference matters enormously for the step-up.

In common law states, when one spouse dies, only the deceased spouse’s share of jointly held assets receives the step-up. The surviving spouse’s half retains its original cost basis.

Example: a married couple in Colorado buys investment property in 1990 for $500,000, holding it as joint tenants. By the time one spouse dies in 2026, the property is worth $5 million. The deceased spouse’s half — $2.5 million — steps up to current value. The surviving spouse’s half retains its $250,000 basis. If the survivor later sells for $5 million, capital gains apply to $2.25 million of gain.

In community property states, both halves of jointly owned community property step up at the first death. The surviving spouse receives a new basis on the entire asset, not just half.

Same scenario in Arizona: both halves step up to $2.5 million each. The survivor’s total basis is $5 million. Sell for $5 million, owe nothing.

The tax difference in that example is substantial — potentially $500,000 or more in capital gains taxes, depending on rates and state taxes. For couples who bought real estate or built investment portfolios decades ago, this distinction can be worth far more than the cost of any estate planning they’ve done.

For snowbirds, the implication is direct. If you spend half the year in a community property state and half in a common law state, your domicile — your legal home state — determines which rules apply to you. This is one of the reasons the domicile decision deserves careful attention, and one of the reasons you want an estate attorney who understands the rules in both states.

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The political history: why it’s survived every attempt to kill it

If you’ve been paying attention to Washington over the past decade, you’ve probably heard someone propose eliminating the stepped-up basis. The Biden administration proposed taxing unrealized gains at death in 2021. Congress has debated it periodically for years. It hasn’t happened.

The history is instructive. Congress actually did attempt to eliminate the step-up once — in the Tax Reform Act of 1976, which replaced stepped-up basis with carryover basis, meaning heirs would inherit the original cost basis and owe tax when they eventually sold. The change was so administratively complicated and politically unpopular that Congress repealed it retroactively in 1980 before it ever fully took effect.

In 2025, the House passed a resolution specifically recognizing the importance of stepped-up basis for family-owned farms and small businesses — a signal that the political appetite for eliminating it remains limited.

That doesn’t mean it’s permanent. Tax law changes. Any provision generating $41 billion per year in foregone revenue is a target in a tight budget environment. The sensible approach is to plan as if the step-up exists, keep an eye on legislation, and maintain flexibility in your estate plan to adapt if the rules change.

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The one-year rule: a small but useful detail

Inherited assets automatically qualify as long-term capital gains property, regardless of how long the decedent held them and regardless of how quickly the heir sells. Even if you inherit stock and sell it the next day, the gain is taxed at long-term capital gains rates — currently 0%, 15%, or 20% depending on income — not the higher short-term rates that apply to assets held less than a year.

This matters for heirs who need liquidity quickly after inheriting. It removes the pressure to wait a year before selling.

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The alternate valuation date: worth knowing about

Normally, the step-up basis is the fair market value on the date of death. But executors of taxable estates have an option: they can elect an alternate valuation date six months after death, provided doing so both reduces the gross estate and reduces the estate tax owed.

For most estates — those below the $15 million federal exemption threshold in 2026 — this election is irrelevant. There’s no estate tax to reduce, so the alternate valuation election isn’t available. But for larger estates, it can be a meaningful tool, particularly after a significant market decline between death and six months later.

If this applies to your situation, your estate attorney will know to raise it. If you’re not sure whether your estate might be subject to federal estate tax, it’s worth a conversation.

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The practical implication

The stepped-up basis provision rewards a simple behavior: holding appreciated assets long enough to pass them to heirs rather than selling them during your lifetime.

For retirees whose income already covers spending, this isn’t a sacrifice. It’s just a decision about which accounts to draw from first. Drawing from tax-deferred accounts like IRAs — which don’t receive a step-up anyway — while preserving the taxable portfolio for transfer is a strategy that costs nothing and potentially saves your heirs a substantial amount.

The conversation is worth having with your advisor before retirement income decisions are locked in. Not because the strategy is complicated, but because the window to make the right choice is earlier than most people realize.

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Content reflects personal experience and independent research. Not legal, tax, or financial advice. Consult qualified professionals for your specific situation.

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Further Reading

• IRC Section 1014 — Basis of property acquired from a decedent. The full statutory text of the stepped-up basis provision, including exceptions. uscode.house.gov

• IRS Publication 559 — Survivors, Executors, and Administrators. The IRS’s guide to the tax obligations that arise when someone dies, including basis rules for inherited property. irs.gov/publications/p559

• IRS Publication 550 — Investment Income and Expenses. Covers cost basis, capital gains calculations, and the tax treatment of investment assets. irs.gov/pub/irs-pdf/p550.pdf

• Community Property States — IRS Overview — A summary of how community property rules affect the tax treatment of assets for married couples. irs.gov/publications/p555

• Tax Reform Act of 1976 and the Carryover Basis Repeal — Background on Congress’s 1976 attempt to replace stepped-up basis and the retroactive repeal in 1980. Search “Tax Reform Act of 1976 carryover basis” for historical context from law review sources.