The Step-Up in Basis: A Little-Known Tax Break for Inherited Assets
Some of the most valuable tax breaks are the ones nobody talks about. The “step-up in basis” is a great example, able to erase decades of taxable gain on an inherited asset (or, if misunderstood, saddle heirs with an unexpected tax bill on money they assumed was tax-free). The rules aren’t complicated, but the exceptions trip families up. Here’s what the step-up in basis is, why it matters so much, and details worth knowing before an asset changes hands.
- A step-up resets an inherited asset’s cost basis to its value on the owner’s date of death. This wipes out capital gains tax on a lifetime of appreciation should the heir sell.
- Not everything qualifies. Traditional IRAs, 401(k)s, annuities, and other “income in respect of a decedent” receive no step-up; heirs owe ordinary income tax on these.
- Inheriting often beats gifting. Assets given away during life keep the giver’s original basis (carryover); assets inherited receive the step-up.
- In New Jersey, only the deceased spouse’s share steps up. This reflects a “half step-up,” unlike community-property states that step up both halves.
- Document the date-of-death value now. This figure becomes the heir’s basis, making it important to secure appraisals and statements sooner rather than later.
What a step-up in basis actually means
What a step-up in basis means
When you inherit an asset, its cost basis resets to its fair market value on the owner’s date of death (under Section 1014 of the tax code) — not what the owner originally paid for it.
The practical effect: the appreciation built up over the owner’s lifetime is never taxed. The heir owes tax only on growth after the date of death, if any.
Every asset you own has a cost basis—generally what you paid for it, plus some adjustments. When you sell, you’re taxed on the gain: the sale price minus that cost basis. When you inherit an asset, its basis is “stepped up” to the asset’s fair market value on the owner’s date of death (per Section 1014 of the tax code). All the appreciation built up during the original owner’s lifetime simply disappears for tax purposes.
For example, let’s assume your father bought stock years ago for $20,000 that’s worth $200,000 when he passes away. Had he sold it during his lifetime, he’d have owed capital gains tax on roughly $180,000 of profit ($200,000 - $20,000). Instead, you inherit it with a new basis of $200,000. If you sell a month later for $205,000, your taxable gain is just $5,000—not $185,000—the lifetime of growth wiped clean.
Why it matters so much
For most families, the step-up is the single largest tax benefit when you pass assets to the next generation: the reason a long-held home, portfolio of appreciated stock, or family business can transfer to heirs without triggering tax on generations of growth. It’s also the reason a well-meaning instinct (“Let me give this to the kids now”) can backfire. As we’ll see, giving an appreciated asset away during life or otherwise leaving it to heirs at death produces very different tax outcomes.
The catch: assets that DON’T get a step-up
Which Assets Step Up — and Which Don’t
“Income in respect of a decedent” (IRD) keeps its built-in tax bill.
| Gets a step-up | No step-up (IRD) |
|---|---|
| Appreciated stock and brokerage holdings | Traditional IRAs and 401(k)s (pre-tax retirement accounts) |
| A long-held home or other real estate | Annuities |
| A family business interest | Pensions and deferred compensation |
| Collectibles and similar appreciated property | Unpaid wages |
When an heir withdraws from an inherited IRD asset, that money is taxed as ordinary income — often at higher rates than capital gains. This is general information, not tax advice for your specific situation.
This is the exception that surprises people most, so it’s worth stating plainly: not all inherited assets receive a step-up.
The major exclusion is a category the tax code refers to as “income in respect of a decedent” (IRD), meaning income the deceased earned or deferred but is not yet taxed on. The most common examples? Traditional IRAs, 401(k)s and other pre-tax retirement accounts, annuities, pensions, deferred compensation, and unpaid wages.
These assets keep their built-in tax bill. When an heir eventually withdraws from an inherited traditional IRA, for example, that money is taxed as ordinary income—often at higher rates than capital gains—just as it would’ve been for the original owner, with no step-up to wipe the slate clean. Families who assume a large inherited IRA is tax-free are in for a jolt; understanding which assets are IRD is necessary to plan around them.
Inheriting often beats gifting
Gift During Life vs. Inherit at Death
Same $20,000 stock, now worth $200,000 — two very different tax results.
| How the asset transfers | Basis the recipient gets | Taxable gain if sold at $200,000 |
|---|---|---|
| Gift during life | Carryover: the giver’s original $20,000 basis | $180,000 of gain |
| Inherit at death | Stepped-up: $200,000 (date-of-death value) | Essentially none |
This is why gifting highly appreciated property during life is often the more expensive path. This is general information, not tax advice for your specific situation.
Because the step-up only happens at death, how an asset is transferred changes the tax result dramatically. For example, when you give an appreciated asset away during your lifetime, the recipient takes your original (i.e., “carryover”) basis. Gift that same $20,000 stock now worth $200,000, and your child inherits your $20,000 basis along with it and owes tax on $180,000 of gain upon selling it. Alternatively, you can leave stocks to him or her at death with the basis stepping up to $200,000: same asset, wildly different tax result.
This is why gifting highly appreciated property during life is often the more expensive path—and why these decisions are worth running by a professional before you make any moves.
For married couples, only half may step up
In New Jersey, only half may step up
When one spouse dies, the step-up generally applies only to the deceased spouse’s share of a jointly owned asset — a “half step-up.” The surviving spouse’s own half keeps its original basis.
The nine community-property states work differently: there, both halves step up at the first spouse’s death. New Jersey isn’t one of them, so the half step-up is the rule — walked through in the numbers below.
Here’s a wrinkle that catches many New Jersey couples off guard. When one spouse passes, the step-up generally applies only to the deceased spouse’s share of a jointly owned asset (i.e., a “half step-up”).
As for the math, let’s say a couple jointly owns stock they bought for $100,000 that’s now worth $500,000. Split it down the middle, and each spouse is treated as owning half the basis ($50,000) and half the value ($250,000). When one spouse passes, only that half steps up—from $50,000 to its current $250,000 value—while the survivor’s own half keeps its original $50,000 basis.
The surviving spouse’s new total basis is therefore $300,000 (the $250,000 stepped-up half plus the $50,000 unchanged half) rather than the full $500,000. Sell right away for $500,000, and about $200,000 of the gain is still taxable.
That differs from the nine community-property states, where both halves step up at the first spouse’s passing. Since this doesn’t apply to New Jersey, the half step-up is the rule here—a key distinction when a surviving spouse sells later on.
It can step down, too
The basis can step down, too
The adjustment isn’t always in your favor. If an asset is worth less than its original basis on the date of passing, the basis steps down to that lower value. Say the owner bought stock for $150,000 that’s only worth $90,000 at death — the heir’s basis becomes $90,000, and the $60,000 built-in loss simply vanishes. Where it makes sense, consider selling a depreciated asset during life so the loss isn’t wasted.
This is general information, not tax advice for your specific situation.
The adjustment isn’t always in the taxpayer’s favor. If an asset is worth less than its original basis on the date of passing, the basis steps down to that lower value.
Say the original owner bought stock for $150,000 that’s only worth $90,000 on the date of passing. In this case, the heir’s basis becomes $90,000—the $60,000 loss built up during the owner’s lifetime simply vanishing. Sell later for $95,000, and the heir shows a $5,000 gain. This is another reason to value assets accurately rather than assume (and, where it makes sense, consider selling a depreciated asset during life so the loss isn’t wasted).
Don’t skip this part: documenting the value
Capture the date-of-death value now
The step-up is only as good as your records, because the date-of-death fair market value becomes the heir’s basis — the number used years later at sale. For publicly traded securities, that’s typically the average of the high and low trading prices on the date of passing (from brokerage records). For a home, a business interest, or collectibles, it usually means a date-of-death appraisal. Capturing it while the information is fresh beats reconstructing it a decade later.
This is general information, not tax advice for your specific situation.
The step-up is only as good as your records. With the date-of-death fair market value becoming the heir’s basis—the number used years later when it comes time to sell—it pays to capture it while the information is fresh and available.
For publicly traded securities, basis is typically the average of the high and low trading prices on the date of passing (available from brokerage records or websites such as Yahoo! Finance). For a home, a business interest, or collectibles, that usually means a date-of-death appraisal.
Waiting a decade to reconstruct what a property was worth is far more difficult and far more likely to be challenged. (In limited cases where a federal estate tax return is filed, an estate may elect an “alternate valuation date” six months later, though most estates simply use the date-of-death value given the $15 million federal exemption per person in 2026.)
What heirs report upon selling
When an heir eventually sells an inherited asset, the sale is reported on that same return (Form 8949 and Schedule D) with the gain measured against the stepped-up basis rather than what the original owner paid. A helpful bonus? Inherited assets are automatically treated as long-term when sold—qualifying for lower long-term capital gains rates—regardless of how briefly the heir actually held them.
Not just for large estates
A common misconception is that the step-up only matters for the wealthy. In fact, it applies to inherited assets regardless of estate size and whether any estate tax is owed. New Jersey no longer imposes an estate tax (repealed for deaths on or after January 1, 2018), the federal estate tax reaching only estates above the $15 million exemption—yet the step-up benefits a modest inherited brokerage account or family home just the same. The estate-tax rule never applies for most families, unlike the basis rule that always does.
Where a CPA fits in
The step-up in basis rewards good records and careful timing and punishes assumptions, especially the assumption that every inherited asset is tax-free. This is where an accountant adds real value: identifying which assets step up and which are IRD, capturing date-of-death values before they’re lost, weighing whether to gift or hold an appreciated asset, and reporting a sale correctly so an heir doesn’t overpay.
Planning ahead or sorting out the basis on something you’ve inherited? Contact Leeds Accounting & Tax Services so we can help you make the most of the step-up—and avoid corresponding traps.
Disclosure:
This article is for general informational purposes only and is not intended as tax or legal advice. Please consult a qualified professional regarding your individual situation.
