Suppose your parent bought a stock decades ago for $20,000, and by the time they pass away it's worth $200,000. That's $180,000 of unrealized capital gain that would have triggered a hefty tax bill if they had sold during their lifetime. Instead, when you inherit it, the step-up in basis resets the cost basis to the $200,000 fair market value at the date of death. Sell it the next week for $200,000, and your taxable gain is zero. Decades of appreciation — gone from the tax rolls.
This is one of the most valuable provisions in the entire tax code, governed by IRC Section 1014, and it applies to most capital assets that pass through a decedent's estate: stocks, bonds, mutual funds, real estate, and business interests held in taxable accounts. It is also frequently misunderstood, and the misunderstandings are expensive. The step-up applies to assets received at death — not to gifts made during life, which carry over the giver's original basis. And it does not apply to traditional retirement accounts, whose withdrawals remain fully taxable to the beneficiary. Knowing which rule applies to which asset is often the difference between a heir owing nothing and owing tens of thousands.
How the step-up actually works
Capital gains tax is calculated on one simple formula: sale price minus cost basis. The step-up rewrites the "cost basis" side of that equation. Instead of inheriting the original purchase price, the heir inherits a basis equal to the asset's fair market value on the date the previous owner died.
| Original owner sells | Heir sells after step-up | |
|---|---|---|
| Purchase price / basis | $20,000 | $200,000 (stepped up) |
| Sale price | $200,000 | $200,000 |
| Taxable capital gain | $180,000 | $0 |
| Result | Large capital gains tax | Little or no tax |
The appreciation that accumulated during the decedent's lifetime simply disappears for income tax purposes. The heir's clock starts fresh at the date-of-death value. If the asset keeps appreciating after that, the heir owes tax only on the gain from the stepped-up basis forward.
Which assets get the step-up — and which don't
The step-up is generous but not universal. It applies to most capital assets in taxable accounts. It emphatically does not apply to tax-deferred retirement accounts, because that money was never taxed in the first place — the beneficiary still owes ordinary income tax on withdrawals.
Gets a step-up
- Individual stocks, bonds, and mutual funds in taxable brokerage accounts
- Real estate — homes, rental property, land
- Closely held business interests
- Collectibles, art, and other capital assets
- Assets held in a revocable living trust
Does NOT get a step-up
- Traditional IRAs and 401(k)s — withdrawals remain fully taxable
- Annuities with untaxed gains
- Assets received as a lifetime gift (carryover basis)
- Income in respect of a decedent (untaxed income owed to the decedent)
Inheriting a traditional IRA or 401(k) does not reset the tax on it. Those accounts hold pre-tax dollars, and the beneficiary pays ordinary income tax on distributions — often under the 10-year withdrawal rule for most non-spouse beneficiaries. This is a fundamentally different regime from inheriting a brokerage account, and it's why the type of account you inherit matters as much as the dollar value.
The gift trap: carryover basis vs. step-up
Here is the single most costly misconception in inheritance planning. People assume that giving away an appreciated asset before death and leaving it to an heir at death are equivalent. They are not — and the difference can be enormous.
An asset gifted during life keeps the giver's original carryover basis. An asset inherited at death gets the step-up. Give a child that same $20,000-basis, $200,000 stock during your lifetime, and they inherit your $20,000 basis — a $180,000 latent gain waiting to be taxed. Let it pass at death instead, and the basis steps up to $200,000, wiping the gain out.
Asset appreciates during the owner's life
A stock or property grows far above its original purchase price, creating a large unrealized capital gain.
Path A — lifetime gift
The recipient takes carryover basis — the giver's original cost. The full built-in gain remains taxable when they eventually sell.
Path B — transfer at death
The heir takes a stepped-up basis equal to date-of-death fair market value. The lifetime appreciation escapes income tax entirely.
Compare the outcomes
For highly appreciated assets, holding until death and letting the step-up apply is usually far more tax-efficient than gifting during life.
This creates a genuine planning tension. Gifting removes future appreciation from your taxable estate (helpful for very large estates near the exemption), but it forfeits the step-up and hands the heir a built-in gain. For most families — comfortably under the multi-million-dollar estate tax exemption — holding highly appreciated assets until death to capture the step-up is the better move. The right answer depends on the size of the estate and the size of the built-in gain.
The community property double step-up
Where a married couple lives can dramatically change the outcome. In community property states, when the first spouse dies, both halves of the couple's community property can receive a step-up — not just the deceased spouse's share. This "double step-up" gives the surviving spouse a fully refreshed basis on the entire asset.
In non-community-property (common law) states, generally only the deceased spouse's half steps up; the surviving spouse's half keeps its original basis. On a highly appreciated jointly held asset, that difference can mean a large capital gains tax bill for the survivor if they later sell.
- Identify which inherited assets qualify for a step-up (taxable accounts) versus which don't (traditional IRAs, 401(k)s)
- Get a defensible date-of-death fair market value — appraisals for real estate and closely held business interests
- Before gifting a highly appreciated asset, weigh carryover basis against the step-up you'd forfeit
- For married couples, understand how community property vs. common law rules affect the surviving spouse's basis
- Keep records of the stepped-up basis — the heir will need it whenever they eventually sell
- Coordinate step-up planning with the overall estate plan, not in isolation
The step-up in basis is one of the most powerful tools in the tax code, and using it well comes down to a few clear rules. Assets inherited at death get a basis reset to date-of-death fair market value — erasing lifetime appreciation for income tax purposes. Assets gifted during life keep carryover basis, so gifting a highly appreciated asset can be a costly mistake. Retirement accounts don't step up, and community property states offer a double step-up that common law states generally don't. Get a solid date-of-death valuation, keep the records, and coordinate with the broader estate plan — and heirs can inherit decades of gains with little or no capital gains tax. Florida, as a common law state with no state income tax, still delivers the full federal step-up on qualifying assets.
Capture the full value of the step-up
MK Tax & Accounting helps heirs and families document date-of-death basis, decide between gifting and inheriting, and coordinate step-up planning with the whole estate — so decades of gains pass with minimal capital gains tax.
Talk to a tax proSources
- IRC Section 1014 — Basis of property acquired from a decedent (step-up in basis)
- IRS — Publication 551, Basis of Assets
- IRS — Topic No. 703, Basis of Assets
- IRC Section 1015 — Basis of property acquired by gifts (carryover basis)
- IRS — Publication 559, Survivors, Executors, and Administrators
- IRS — Publication 550, Investment Income and Expenses (inherited assets and holding period)
Frequently asked questions
A step-up in basis resets the cost basis of an inherited asset to its fair market value on the date of the original owner's death. Because capital gains tax is calculated on the difference between the sale price and the basis, this reset can erase decades of unrealized appreciation — so heirs who sell shortly after inheriting often owe little or no capital gains tax.
Most capital assets that pass through a decedent's estate qualify — stocks, bonds, mutual funds, real estate, and business interests held in taxable accounts. Assets held in traditional IRAs, 401(k)s, and other tax-deferred retirement accounts do NOT receive a step-up, because that income was never taxed and remains taxable to the beneficiary as it's withdrawn.
No. This is the critical difference. Assets you receive as a gift during the giver's lifetime keep the giver's original cost basis — called carryover basis. Only assets transferred at death get the step-up. That's why giving away a highly appreciated asset before death can be far worse than letting it pass through the estate.
In community property states, both halves of a married couple's community property can receive a full step-up when the first spouse dies — a 'double step-up' — not just the deceased spouse's half. In non-community-property states, generally only the deceased spouse's share steps up. This distinction can save a surviving spouse a large amount of capital gains tax.
