The step-up in basis is a tax rule that allows heirs to inherit appreciated assets at their fair market value at the date of death, rather than the original purchase price—completely erasing the capital gains taxes that would otherwise be owed on the appreciation. When your parent purchases 100 shares of stock for $5,000 and passes away thirty years later when that stock is worth $85,000, your basis (or cost basis) is reset to $85,000. If you sell the stock immediately or shortly after, you owe zero capital gains tax on that $80,000 gain.
This single provision costs the federal government approximately $72.5 billion in forgone tax revenues annually according to the Joint Committee on Taxation—making it one of the largest tax expenditures in the entire federal system, accounting for roughly 25% of all capital gains tax revenues. The step-up in basis has been part of the tax code since 1921, surviving multiple reform efforts and remaining largely untouched even after the One Big Beautiful Bill Act restructured estate taxes in 2025. It represents one of the most valuable—and controversial—wealth transfer benefits available to American families, yet it remains poorly understood by those who could benefit from it most. Understanding how step-up in basis works, who benefits most, and how it interacts with other estate planning rules is essential for anyone concerned with preserving wealth for the next generation.
Table of Contents
- HOW THE STEP-UP IN BASIS WORKS IN PRACTICE
- THE TAX ADVANTAGE AND WHO BENEFITS MOST
- COMMUNITY PROPERTY STATES AND THE HIDDEN ADVANTAGE
- STEP-UP IN BASIS AND ESTATE TAX PLANNING IN 2026
- WHAT STEP-UP IN BASIS DOES NOT COVER
- INCOME TAX CONSIDERATIONS AND THE FAIR MARKET VALUE DETERMINATION
- THE FUTURE OF STEP-UP IN BASIS AND ONGOING POLICY DEBATES
- Conclusion
HOW THE STEP-UP IN BASIS WORKS IN PRACTICE
The mechanics of step-up in basis begin with a simple concept: basis. Basis is the value you assign to an asset for tax purposes—typically what you paid for it. When you sell an asset, the capital gain is calculated as the sale price minus your basis. If you bought a rental property for $200,000 and sell it for $400,000, your capital gain is $200,000, and you owe capital gains tax on that amount. The step-up in basis changes this calculation entirely when an asset is inherited. When the property owner passes away, the executor or administrator determines the fair market value of each inherited asset on the date of death (or, in some cases, an alternative valuation date six months later). This determined value becomes the new basis for the heirs.
Using the rental property example: if you inherit a property valued at $400,000 at your parent’s death, your basis is $400,000, not the $200,000 your parent originally paid. This reset is permanent and complete. Even if your parent’s will specifies the purchase price, even if there’s clear documentation of the original cost, the new owner’s basis is the stepped-up value. The previous appreciation is simply erased from a tax perspective, transferred to the heirs without any capital gains tax burden. This works for nearly all types of assets: real estate, stocks, bonds, mutual funds, business interests, artwork, collectibles, and personal property. A stock portfolio worth $500,000 when inherited becomes $500,000 in basis. A collection of art purchased gradually over decades for a total of $50,000 but valued at $250,000 at death steps up to $250,000 in basis. The only major exceptions are retirement accounts like traditional IRAs, SEP-IRAs, and 401(k)s, which retain their original basis and continue to be subject to income tax when withdrawn by beneficiaries—a critical limitation many families overlook.
THE TAX ADVANTAGE AND WHO BENEFITS MOST
The tax benefits of step-up in basis are extraordinary when assets have appreciated significantly. Consider a real example: a homeowner who purchased a primary residence for $150,000 in 1990 and is still living there when they pass away in 2026, when it’s worth $1.2 million. Their heirs inherit a home with a stepped-up basis of $1.2 million. If they sell it immediately, there’s no capital gains tax. If they eventually sell it for $1.25 million five years later, their capital gain is only $50,000. Without the step-up, the heirs would face $250,000 in capital gains (roughly $40,000 to $60,000 in taxes depending on their tax bracket).
The step-up saved the family tens of thousands of dollars in taxes that would have been due to the federal government. However, these benefits are dramatically skewed toward the wealthiest families. According to the Congressional Budget Office, in 2019, just 56% of all step-up in basis benefits went to the top 20% of decedents’ estates by value. More strikingly, the top 1% of estates captured $7 billion of the total stepped-up value benefits—nearly one-quarter of all benefits despite representing a tiny fraction of decedents. For middle-class families, step-up in basis provides real value when there’s significant investment appreciation, but the largest benefits accrue to those with substantial accumulated wealth in appreciated assets. Families with modest estates and little invested outside retirement accounts may see minimal benefit, while ultra-wealthy families with multi-million-dollar investment portfolios benefit enormously.
COMMUNITY PROPERTY STATES AND THE HIDDEN ADVANTAGE
One of the most overlooked aspects of step-up in basis is how it interacts with community property laws in nine states: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. In these states, married couples who own assets as community property receive a unique tax advantage: when one spouse dies, both the deceased spouse’s share and the surviving spouse’s share of jointly owned community property receive a full step-up in basis. This is extraordinarily valuable compared to other states. To illustrate with a concrete example: A married couple in California purchased an investment property together for $300,000 as community property. When one spouse passes away and the property is worth $1 million, both halves of the property step up to their full current value.
The surviving spouse now has a basis of $1 million in the entire property. If they later sell it, they owe capital gains tax only on appreciation above $1 million, not above $300,000. In contrast, a similar couple in a non-community property state who held the property as joint tenants with right of survivorship would see only the deceased spouse’s half step up to current value. The surviving spouse’s half retains the old basis and carries the capital gains tax burden on that portion. Community property rules aren’t as widely known or discussed as they should be, but for married couples with significant appreciated assets, choosing the right state of residence or structuring property ownership with community property law in mind can represent hundreds of thousands of dollars in tax savings.
STEP-UP IN BASIS AND ESTATE TAX PLANNING IN 2026
The landscape for step-up in basis planning changed substantially in 2025 with the passage of the One Big Beautiful Bill Act. Despite proposals from various administrations to eliminate step-up in basis entirely, the law did not touch this benefit. What the law did change was the estate tax exemption, which now stands at $15 million per person ($30 million for married couples with portability) starting in 2026. These exemption amounts are indexed for inflation beginning in 2027 and come with no sunset provision, providing long-term stability for large estates. The federal estate tax rate remains at 40% on assets exceeding these exemption thresholds.
This creates an interesting planning dynamic. Families with estates below the exemption threshold—$15 million for individuals, $30 million for couples—may avoid estate taxes entirely, meaning step-up in basis is their primary tax benefit. For these families, the step-up is pure windfall: they get appreciated assets into their heirs’ hands with no tax cost at all. For families with estates exceeding the exemption, step-up in basis becomes part of a broader estate planning strategy. Some assets may be subject to the 40% federal estate tax (plus state estate taxes in some states), while others benefit from step-up in basis. The strategic question becomes which assets to hold until death (benefiting from step-up) and which to gift during life or place in trust structures that allow assets to pass to heirs with favorable tax treatment.
WHAT STEP-UP IN BASIS DOES NOT COVER
One critical limitation that catches many families off guard is that step-up in basis does not apply to retirement accounts. Traditional IRAs, SEP-IRAs, SIMPLE IRAs, 401(k)s, 403(b)s, and similar tax-deferred retirement plans retain their original basis and continue to be subject to ordinary income tax when beneficiaries withdraw funds. If your parent passes away with a $500,000 traditional IRA, the beneficiary inherits $500,000 in an account—but every dollar they withdraw is taxed as ordinary income at their marginal tax rate, not capital gains rates. This can result in an effective tax rate of 24% to 37% or higher, depending on the beneficiary’s tax bracket, compared to the 15% to 20% long-term capital gains rates that apply to inherited investments.
The SECURE Act of 2019 and SECURE 2.0 of 2022 accelerated the taxation of inherited retirement accounts by requiring most non-spouse beneficiaries to withdraw all funds within ten years, creating significant income tax bunching. This is why retirement accounts are sometimes considered “income-in-respect-of-a-decedent” (IRD) with unfavorable tax characteristics compared to other inherited assets. Another limitation worth noting: step-up in basis does not apply to assets transferred during your lifetime. If you give appreciated assets to a child before death, they inherit your original basis and must pay capital gains tax if they later sell. This means families sometimes face a planning choice: hold appreciated assets until death to get the step-up, or gift them early for other estate planning reasons (to reduce the taxable estate, for example) knowing the step-up benefit is foregone.
INCOME TAX CONSIDERATIONS AND THE FAIR MARKET VALUE DETERMINATION
When an asset receives a stepped-up basis at death, the executor or administrator must determine the asset’s fair market value on the date of death. For publicly traded securities, this is straightforward—you use the closing price on the date of death. For real estate, business interests, private holdings, and artwork, determining fair market value often requires professional appraisals. These appraisals can be expensive, sometimes costing thousands of dollars for complex or high-value assets, and they’re necessary not just for tax planning but for actual tax return filings. The federal estate tax return (Form 706) requires documentation of valuations for all estate assets, and the IRS has years to challenge valuations it believes are inflated. Families sometimes wonder if they can value assets conservatively at death to reduce the stepped-up basis and thus minimize future capital gains taxes.
This is incorrect and counterproductive. A lower stepped-up basis means heirs pay more capital gains tax when they eventually sell. The stepped-up basis is determined by fair market value at death—not by optimistic guessing or conservative undervaluation. Moreover, undervaluing assets on an estate tax return can trigger IRS penalties. The key planning insight is that the stepped-up basis is based on the actual fair market value at death, so getting accurate appraisals is both necessary and valuable. If assets are significantly undervalued on an estate return, the IRS may challenge the valuation and increase it, which would actually increase the stepped-up basis in your favor—but this audit process is expensive and time-consuming.
THE FUTURE OF STEP-UP IN BASIS AND ONGOING POLICY DEBATES
Step-up in basis remains a persistent point of political debate, though efforts to eliminate it have repeatedly failed. Various administrations have proposed eliminating or limiting step-up in basis as a revenue-raising measure, citing the $72.5 billion annual cost to federal revenues and the concentration of benefits among wealthy estates. The Biden administration included step-up elimination in earlier budget proposals, and the idea resurfaces regularly as a potential tax reform. However, as of 2026, step-up in basis remains fully intact despite the significant tax reform enacted in the One Big Beautiful Bill Act.
Looking forward, the durability of step-up in basis will likely depend on political cycles and broader tax policy directions. Changes to this provision would require legislative action, and such changes might include complete elimination, partial limitations (such as applying step-up only to amounts below a certain threshold), or modifications that apply specifically to certain asset types. For now, families should plan assuming step-up in basis will remain available, while recognizing that this assumption could change. Any significant future tax reforms that address wealth transfer or capital gains taxation could potentially affect this benefit, making it prudent to execute estate plans with legal guidance rather than delaying in hopes of future law changes.
Conclusion
The step-up in basis is a powerful wealth transfer benefit that allows heirs to inherit appreciated assets at their fair market value at death, erasing the accumulated capital gains tax liability from the original owner’s lifetime. With a federal cost of $72.5 billion annually and benefits heavily concentrated among wealthy estates, it remains one of the most valuable—and controversial—features of the federal tax code. Understanding how step-up in basis works, recognizing its limitations (particularly for retirement accounts), and leveraging special advantages (such as community property rules for couples) is essential for comprehensive estate planning.
For families with significant appreciated assets, the step-up in basis should be factored into broader wealth transfer decisions. This might mean holding certain appreciated assets until death rather than gifting them, being mindful of which assets to leave to which beneficiaries based on their tax characteristics, and structuring ownership in states or ways that maximize the step-up benefit. Consult with a tax professional and estate planning attorney to ensure your specific situation is optimized for this provision and that your overall plan aligns with the 2026 estate tax laws and your family’s wealth transfer goals.