Step-Up in Basis: How Inherited Assets Avoid Capital Gains Tax

The step-up in basis is one of the most valuable tax provisions in the entire Internal Revenue Code. When someone dies, the cost basis of their assets resets to fair market value — wiping out decades of unrealized capital gains in a single moment. Understanding this rule is essential for estate planning and deciding whether to gift or hold appreciated assets.

Key Takeaways

• Inherited assets receive a new cost basis equal to fair market value at the date of death.
• This eliminates all unrealized capital gains — heirs can sell immediately with little or no tax.
• Applies to stocks, real estate, bonds, mutual funds, and business interests.
• Community property states offer a double step-up on jointly owned assets.
• Gifted assets do NOT get a step-up — they carry over the donor's original basis.

How the Step-Up in Basis Works

When you buy an asset, your cost basis is what you paid for it. If you sell for more than your basis, the difference is a taxable capital gain. But when you inherit an asset, the IRS resets your basis to the asset’s fair market value (FMV) on the date of the decedent’s death.

Example:

Item	Amount
Parent’s original purchase price (1985)	$50,000
Fair market value at death (2026)	$500,000
Unrealized gain during parent’s lifetime	$450,000
Heir’s new basis (step-up)	$500,000
Heir sells immediately for $500,000	$0 taxable gain

Without the step-up, the heir would owe capital gains tax on $450,000. At a 15% long-term rate, that is $67,500 in taxes. The step-up in basis eliminates this entirely.

What Assets Qualify for the Step-Up?

The step-up in basis applies to most capital assets owned at death:

• Stocks and mutual funds — including those in taxable brokerage accounts
• Real estate — primary residences, rental properties, vacant land
• Bonds (though special rules apply to certain bond types)
• Business interests — partnership interests, S-Corp stock, sole proprietorship assets
• Collectibles — art, antiques, precious metals
• Cryptocurrency (treated as property by the IRS)

Assets that do NOT receive a step-up:

• Retirement accounts (IRAs, 401(k)s) — these are taxed as ordinary income when distributed to beneficiaries. See inherited IRA rules.
• Assets in certain irrevocable trusts — if the grantor gave up all ownership and the assets are not included in the gross estate under IRC Sections 2036-2038, those assets do not receive a step-up. Irrevocable trusts that are still included in the estate (such as intentionally defective grantor trusts) typically do receive a step-up.
• Income in respect of a decedent (IRD) items

Community Property States: The Double Step-Up

In the nine community property states, both halves of jointly owned community property receive a step-up in basis when one spouse dies — not just the deceased spouse’s half.

The community property states are: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin.

Example: A married couple in California bought stock for $100,000 as community property. At the first spouse’s death, the stock is worth $600,000.

Scenario	Basis After First Death
Common law state	$350,000 (half stepped up: $50K original + $300K step-up)
Community property state	$600,000 (both halves stepped up)

The surviving spouse in a community property state can sell the entire position for $600,000 with zero capital gains tax.

Step-Up vs. Carryover Basis: Inheritance vs. Gifts

This distinction is critical for estate planning.

	Inheritance (at death)	Gift (during life)
Basis rule	Step-up to FMV at death	Carryover (donor’s original basis)
Unrealized gains	Eliminated	Passed to recipient
Tax impact on sale	Minimal or zero	Full gain from donor’s purchase price

This is why gifting highly appreciated assets during life is often a tax mistake.

If a parent owns stock with a $20,000 basis worth $200,000 and gifts it to a child, the child inherits the $20,000 basis. When the child sells, they owe capital gains tax on $180,000.

If the parent instead holds the stock until death, the child inherits a $200,000 basis and owes zero capital gains tax. For more on gift tax rules, see our gift tax guide.

Planning Strategies Using the Step-Up

1. Hold appreciated assets until death. If you have stocks or real estate with massive unrealized gains and do not need the cash, holding until death lets your heirs inherit tax-free.

2. Avoid gifting highly appreciated assets. Gift cash or low-appreciation assets instead. Reserve high-appreciation assets for the step-up.

3. Consider donating appreciated assets to charity. If you want to give during your lifetime, donating appreciated stock to charity avoids capital gains and generates a deduction — a better outcome than gifting to family. See charitable giving strategies.

4. Review asset titling in community property states. Ensure appreciated assets are held as community property to qualify for the full double step-up.

5. Use the basis step-up in tax basis tracking. If you inherit assets, document the FMV at the date of death. You will need this basis when you eventually sell.

Worked Example: Family Home — Inherited vs. Gifted

The Johnson family home was purchased in 1990 for $150,000. In 2026, it is worth $750,000.

Scenario A: Parent gifts the home to child during life.

• Child’s basis: $150,000 (carryover)
• Child sells for $750,000
• Taxable gain: $600,000
• After Section 121 exclusion ($250,000 if child lives there 2 years): $350,000 taxable
• Tax at 15%: $52,500

Scenario B: Child inherits the home at parent’s death.

• Child’s basis: $750,000 (step-up to FMV)
• Child sells for $750,000
• Taxable gain: $0
• Tax: $0

The step-up in basis saved $52,500 — and potentially more if the child does not qualify for the Section 121 home sale exclusion.

Legislative Risk

The step-up in basis has been a target for reform multiple times. Proposals have included replacing the step-up with carryover basis (requiring heirs to use the decedent’s original basis) or imposing a capital gains tax at death. As of 2026, the step-up remains in effect, but it is worth monitoring proposed legislation.

For broader estate planning context, see our guides on estate tax basics and estate tax planning strategies.

How sharper.tax Helps

sharper.tax analyzes your investment portfolio and tax return to identify highly appreciated assets that would benefit from the step-up in basis at death versus assets better suited for gifting or charitable donation. We help you make informed decisions about which assets to hold and which to transfer. Sophisticated tax planning used to require a high-end CPA — we make it available for free.

Sources

• IRC Section 1014: Basis of Property Acquired from a Decedent
• IRS Publication 551: Basis of Assets
• IRS Publication 559: Survivors, Executors, and Administrators

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The information above is educational and not tax advice.