What Is Step-Up in Basis and Why Should You Care in Retirement?

One of the most underappreciated tax breaks in American law is the "step-up in basis." Here's the idea: when you inherit an asset, the tax code resets its cost basis to its fair market value at the date of death. This eliminates all the built-in capital gains tax that the original owner would have owed. If your parents bought a house for $200,000 and it's worth $800,000 when they die, you inherit it with a $800,000 cost basis—not $200,000. Sell it immediately, and you owe zero capital gains tax.

This single rule can save heirs hundreds of thousands of dollars in taxes. It also changes how you should think about your retirement portfolio: holding appreciated assets (stocks, real estate, rental property) until death can be far more tax-efficient for your heirs than selling them and gifting the proceeds while you're alive.

Quick definition: Step-up in basis is the rule that inherited assets are valued at fair market value on the date of death, with that value becoming the heir's new cost basis. This erases any capital gains tax on appreciation that occurred during the deceased's lifetime.

Understanding this rule and how to structure your portfolio around it is one of the most powerful estate-planning moves you can make—and it costs you nothing but a little planning.

Key takeaways

• Step-up in basis resets the cost basis of inherited assets to their fair market value at death, eliminating capital gains taxes on appreciation.
• Holding appreciated securities, real estate, and other assets until death is often more tax-efficient than selling and gifting the proceeds.
• Step-up applies to most assets (stocks, bonds, real estate, mutual funds) but not to retirement accounts (IRAs, 401(k)s), which retain their original basis.
• Planning your portfolio mix between retirement and taxable accounts affects how much step-up benefit your heirs receive.
• The step-up rule is permanent as of the mid-2020s, though Congress periodically proposes eliminating or limiting it.

How Step-Up in Basis Works

Let's illustrate with a concrete example. You bought Acme Corp stock in 1995 for $15,000. Today, it's worth $450,000—a $435,000 gain. You're retired and no longer need the stock.

Scenario A: Sell now, gift to heirs.

• Sell stock: $450,000 proceeds
• Capital gains tax: $435,000 × 15% (long-term rate) = $65,250 in federal tax
• Amount to gift to heirs: $384,750
• Heirs' cost basis in the $384,750 they receive: whatever they use it for (if reinvested in stock, they'd likely allocate the $384,750 pro-rata).

Scenario B: Hold until death.

• At your death, the stock is worth $450,000 (let's say the value is unchanged).
• Heirs inherit the stock with a $450,000 cost basis.
• They sell it immediately: $450,000 proceeds, $0 capital gains tax.
• Heirs receive: the full $450,000.

The difference is stark: $384,750 (after gift) vs. $450,000 (inherited). That extra $65,250 came from avoiding capital gains tax, and it all went to your heirs, not the IRS.

The Emotional Timing Issue

Many retirees struggle with this insight because it feels wrong. "If I can't spend it, why hold it?" The answer: you're not holding it for yourself; you're holding it for your heirs. If you don't need the money and you have heirs, holding appreciated assets is usually better for them.

However, if you do need the money for living expenses, you should absolutely sell and use the proceeds. Never sacrifice your retirement security for tax optimization.

Step-Up: Who Gets It and Who Doesn't

Step-up in basis applies to most asset types:

• Stock and securities
• Mutual funds and ETFs
• Real estate (primary residence, rental property, land)
• Bonds and fixed income
• Art, collectibles, and valuables
• Business interests (some limitations apply)

Critically, step-up does NOT apply to:

• Traditional IRAs, 401(k)s, 403(b)s, SEP-IRAs, and SIMPLE IRAs
• Roth IRAs and Roth 401(k)s
• Life insurance proceeds (though life insurance has other benefits)
• Retirement accounts retain their original tax treatment; heirs inherit the account and its original basis

This is one reason why the asset location strategy matters. If you're going to leave appreciated assets to heirs, put appreciation-prone investments (growth stocks, real estate) in taxable accounts where step-up applies. Put interest-bearing or dividend-heavy investments in tax-deferred retirement accounts, where step-up doesn't matter (the heirs will owe taxes on distributions anyway).

Portfolio Positioning for Step-Up

Here's a strategic way to think about it:

In your taxable brokerage account: Hold appreciation-prone, long-term holdings. Think: growth stocks, real estate, long-term business interests. When you die, heirs get step-up and inherit them tax-free.

In your IRAs and 401(k)s: Hold dividend-paying stocks, bonds, or other income-producing assets. When heirs inherit, they'll owe ordinary income tax on distributions regardless, so the step-up benefit is minimal. However, these accounts still have value because they're tax-deferred during your lifetime.

In your Roth accounts: These are even better than step-up. Not only do heirs get tax-free distributions (which is better than step-up for income tax), but the accounts themselves compound tax-free forever.

This positioning isn't always perfectly achievable (contribution limits, employer plans, etc.), but the principle is: maximize step-up benefit by holding appreciated assets in taxable accounts and minimizing them in retirement accounts.

Step-Up Timing and Fair Market Value Dates

The IRS values inherited assets as of the "estate tax valuation date," which is typically the date of death or, if the estate elects, six months after death (called the "alternate valuation date"). For most estates, the date-of-death value applies.

This creates an interesting nuance: if an asset declines in value between death and the heir's sale, the heir's cost basis is the higher date-of-death value. So if your $450,000 stock drops to $400,000 by the time your heir sells it, they inherit a $450,000 basis but sell for $400,000, triggering a $50,000 loss. They can claim that loss.

Conversely, if the stock rises to $500,000 before they sell it, they inherit a $450,000 basis and sell for $500,000, triggering a $50,000 gain. However, this gain is often long-term (even if they sell immediately), because the holding period includes the period before they inherited.

Step-Up Benefit vs. Lifetime Sale

Real-world examples

Example 1: Growth stock inheritance. Patricia bought Amazon stock 20 years ago for $8,000 (about 100 shares). Today it's worth $420,000. She's 75, retired, and doesn't need the money. If she sells now and gifts the $420,000 to her daughter, she pays $62,000 in capital gains tax (15% × $412,000 gain), leaving $358,000 to gift. If she holds and dies with her daughter as beneficiary, the daughter inherits it with a $420,000 basis, sells it, and pays zero tax. The difference: $62,000 in taxes saved.

Example 2: Real estate and rental property. James and his wife bought a rental house in 1985 for $120,000. It's now worth $850,000. James passes away in 2024. James's wife is the beneficiary and inherits the house with an $850,000 cost basis. She can now rent it out or sell it. If she sells, she pays capital gains tax only on appreciation after the date of death. Previously accrued gains are erased by step-up. Without step-up, she'd owe tax on $730,000 in gains.

Example 3: Mixed portfolio after death. Rebecca's estate contains $2 million in taxable investments (stocks with $1.8 million in unrealized gains) and $1 million in IRAs. Her two children are equal beneficiaries. The $2 million in stocks receives step-up; heirs inherit a $2 million basis and owe zero capital gains tax on the appreciation. The $1 million in IRAs does not receive step-up; when heirs take distributions, every dollar is taxable income. Rebecca's estate tax planning should ensure the step-up benefit is maximized—perhaps by funding the Roth with some assets and keeping the appreciated stocks in taxable accounts.

Common mistakes

Mistake 1: Not taking advantage of step-up for low-income heirs. Some retirees sell appreciated assets and try to gift the proceeds to lower-income heirs in hopes of "income splitting." But this triggers capital gains tax for the retiree. Better: hold the appreciated assets, let heirs inherit with step-up, then they can sell and trigger minimal capital gains tax (because they're in a low bracket). The heirs get the benefit, not the IRS.

Mistake 2: Assuming all inherited assets get step-up. Inherited IRAs, 401(k)s, and Roth accounts do not get step-up. These accounts inherit their original tax treatment. Always clarify which assets in your portfolio are subject to step-up and which aren't.

Mistake 3: Selling appreciated assets too early in retirement. Some retirees liquidate appreciated assets in their sixties to simplify their portfolio, pay capital gains tax, and hold the proceeds in low-yield cash. If they live long enough, they'd have been better off holding the appreciated assets and letting heirs step them up. Only sell if you need the money or if the asset no longer fits your strategy.

Mistake 4: Forgetting that "married filing jointly" affects step-up. If you're married and own an appreciated asset jointly with your spouse, at the first spouse's death, only half the asset gets step-up (the half they owned). The other half retains the original basis. This is called "stepped-up only to 50%." Plan accordingly.

Mistake 5: Neglecting state-level capital gains taxes. Several states (California, New York, etc.) tax capital gains at ordinary income rates. Step-up applies to federal taxes but not state taxes. A $1 million gain might eliminate federal capital gains tax but still trigger significant state tax. Factor this into your planning.

FAQ

Will step-up in basis be eliminated?

Congress has periodically proposed eliminating or limiting step-up in basis to raise revenue. However, as of the mid-2020s, step-up is in place and permanent under current law. Any changes would require Congressional action and would likely be phased in. Always stay informed of tax law changes, but don't plan assuming elimination.

Can I step-up my own assets while alive?

No. Step-up in basis applies only at death. While you're alive, selling an appreciated asset triggers capital gains tax. There's no loophole to "step up" your own cost basis—only heirs receive that benefit.

Do inherited assets get step-up if they're held in a trust?

Yes. Assets held in a revocable living trust get stepped-up at the settlor's death, just as if they were held individually. The trust is transparent for tax purposes. However, assets held in irrevocable trusts have different rules; consult a tax advisor about your specific trust structure.

What about inherited IRAs and 401(k)s? Do they get step-up?

No. Inherited retirement accounts do not receive step-up. The beneficiary inherits the account with its original basis and original tax treatment. All distributions are ordinary income, subject to SECURE Act ten-year distribution rules (for non-spouse beneficiaries). However, inherited Roth accounts still distribute tax-free, which is better than step-up.

If I inherit appreciated real estate, must I sell it or can I keep it?

You can keep it. You inherit the property with a stepped-up basis, and you only trigger capital gains tax if/when you sell. You can hold it indefinitely. However, if it's rental property, you'll owe ordinary income tax on rental income (no special step-up benefit there). And if you eventually sell, you'll owe capital gains tax on appreciation after the inherited date.

Does step-up apply to inherited collectibles or art?

Yes, generally. Collectibles (art, antiques, precious metals) inherited at death receive step-up in basis. However, there's a capital gains tax rate for collectibles (28%, higher than stocks at 15–20%). So while step-up eliminates the pre-death gain, if the heir sells post-death gains, they pay the collectibles rate.

Related concepts

• Leaving a Roth as a Legacy
• Stretch IRAs and What Changed
• Estate Planning and Beneficiary Designations
• Building a Legacy Plan
• Tax-Efficient Withdrawal Strategies

Summary

Step-up in basis is one of the most valuable tax breaks available to heirs. When you inherit an asset, its cost basis "steps up" to fair market value at death, erasing all built-in capital gains tax. This rule favors holding appreciated securities and real estate until death rather than selling and gifting during your lifetime. For heirs, it means they can inherit large unrealized gains with zero federal capital gains tax liability. For retirees, it means strategic portfolio positioning—holding appreciation-prone assets in taxable accounts (to maximize step-up benefit) and income-producing assets in retirement accounts—can dramatically reduce your heirs' overall tax burden. As of the mid-2020s, step-up is permanent, though always verify current law with a tax professional.

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