What the Stepped-Up Basis Is and Where It Comes From

IRC Section 1014 provides that the basis of property acquired from a decedent is the fair market value (FMV) at the date of the decedent’s death. The original cost basis — whatever the deceased person paid for the asset decades ago — is wiped out and replaced with the current value. This applies to real estate, stocks, bonds, business interests, art, collectibles, and virtually any capital asset that passes through an estate.

The effect is straightforward: all unrealized appreciation during the decedent’s lifetime disappears for tax purposes. Nobody pays capital gains tax on that appreciation. Not the deceased person, not the estate, and not the heir. The gain is simply forgiven.

There’s a reason estate planners call this the single biggest tax break in the code. For families with highly appreciated assets — a house held for 40 years, a stock portfolio that’s grown tenfold, a family business — the stepped-up basis can eliminate hundreds of thousands or even millions in potential capital gains tax.

The Alternate Valuation Date

The executor of the estate has a choice: value the assets at the date of death, or elect the alternate valuation date, which is six months after the date of death. This election is made on Form 706 (the estate tax return) and applies to all assets in the estate — you can’t pick and choose which assets get which valuation date. The alternate valuation rules are codified in IRC Section 2032.

Why would an executor choose the alternate date? If asset values dropped significantly in the six months following death, the lower valuation reduces the estate tax liability. It also gives heirs a lower stepped-up basis, which means more capital gains exposure if they sell later — so there’s a trade-off. The alternate valuation election is only available if it actually reduces the gross estate and the estate tax. You can’t use it just to give heirs a higher or lower basis.

If an asset is sold or distributed within the six-month window, its value on the date of sale or distribution becomes its alternate valuation, not the six-month date. This gets complicated in estates with multiple beneficiaries and staggered distributions — talk to your CPA before making the election.

Community Property Gets a Double Step-Up

This is one of the biggest planning advantages for married couples in community property states (Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin). When one spouse dies, both halves of community property get a stepped-up basis under IRC Section 1014(b)(6) — not just the deceased spouse’s half.

In a common-law state, only the decedent’s share receives the step-up. If a married couple jointly owned a stock portfolio worth $2 million with an original basis of $200,000, and one spouse dies in a common-law state, only half gets the step-up. The surviving spouse’s half retains the $100,000 carryover basis. But in a community property state, the entire $2 million portfolio gets a new basis of $2 million. The surviving spouse could sell the entire portfolio the next day with zero capital gains.

This is why some estate planners in common-law states explore community property trusts in states like Alaska and Tennessee — states that allow married couples to opt into community property treatment for specific assets, potentially unlocking the double step-up even if the couple doesn’t live in a traditional community property state.

Joint Tenancy: Only Half Steps Up

Property held in joint tenancy with right of survivorship (JTWROS) — a common way couples and parents/children own real estate — gets only a partial step-up. When one joint tenant dies, their share receives the step-up, but the surviving tenant’s share retains its original basis.

For a 50/50 joint tenancy between spouses in a common-law state, that means half the property gets a new basis and half keeps the old one. If a parent adds a child as a joint tenant on a property, and the parent dies, only the parent’s share (typically 50%) gets the step-up. The child’s share keeps whatever basis the parent had. And here’s the overlooked wrinkle: adding a child as a joint tenant during your lifetime is treated as a gift, not an inheritance. The gifted portion gets a carryover basis (the parent’s original cost) under IRC Section 1015, not a step-up.

This is one of those areas where a well-meaning attempt to simplify things — “I’ll just put my kid’s name on the deed” — creates a worse tax outcome than leaving the property to pass through the estate. The estate gets the full step-up; the joint tenancy gets a partial step-up at best, and a carryover basis at worst for the gifted portion.

Gifted Property vs. Inherited Property: Two Very Different Rules

The difference between giving someone property while you’re alive and leaving it to them after death is enormous, and most people don’t realize it until after the transaction is done.

When you gift property during your lifetime, the recipient takes a carryover basis — your original cost basis carries over to them. If you bought stock for $10,000 and gift it when it’s worth $500,000, the recipient’s basis is $10,000. They’ll owe capital gains on the full $490,000 appreciation when they sell.

When you leave that same stock to someone through your estate, they get a stepped-up basis of $500,000. They could sell it the next day and owe nothing in capital gains.

The planning implication is clear: don’t give away highly appreciated assets during your lifetime if the goal is to minimize taxes for the recipient. Hold them until death, let the step-up do its work, and the appreciation escapes capital gains tax entirely. Gift low-basis assets only when there’s a non-tax reason that outweighs the tax cost — for example, funding a child’s down payment when you don’t have other liquid assets to give.

Gifting does make sense for assets that haven’t appreciated much, or for income-producing assets you want to shift to someone in a lower tax bracket. But for the classic scenario — real estate purchased decades ago, a stock position with a cost basis near zero — holding until death is almost always the better tax play.

Depreciated Property and Recapture

The step-up doesn’t just erase appreciation. It also eliminates depreciation recapture. If the deceased owned a rental property and claimed $200,000 in depreciation over 20 years, that depreciation recapture liability (taxed at up to 25% under Section 1250) disappears at death. The heir’s basis is the FMV at date of death, not the depreciated basis the deceased was using. No recapture. No gain from the depreciation. Gone.

For families with significant rental real estate portfolios, this is an enormous benefit. A lifetime of depreciation deductions reduces the owner’s taxable income year after year, and then the recapture obligation vanishes when the property passes to heirs. It’s one of the reasons real estate is often described as the most tax-advantaged asset class — the combination of depreciation during life and step-up at death creates a double benefit that’s hard to replicate with any other type of investment. For more on real estate tax strategies, see our full guide.

Documentation and Valuation

The stepped-up basis is only as good as your ability to prove the FMV at date of death. For publicly traded stocks, this is easy — you look up the closing price on the date of death (or the average of the high and low). For real estate, business interests, art, and other hard-to-value assets, you need an appraisal.

Get the appraisal promptly. Trying to establish the FMV of a property three years after someone died, when you’re being audited, is far harder than getting an appraisal within the first few months. If an estate tax return (Form 706) was filed, the values reported on that return are strong evidence of basis for the heirs. If no estate tax return was required (because the estate was below the exemption threshold), the heirs need their own documentation.

For real estate, hire a qualified appraiser and have them value the property as of the date of death. For investment accounts, get the brokerage statements from the month of death. For closely held businesses, you may need a formal business valuation. Keep all of this in your permanent tax records — you’ll need it when you eventually sell the inherited asset, and that sale could come decades later. If you’re using a property sale calculator to estimate your gain, the basis number you plug in has to be right.

Legislative Risk: Will the Step-Up Survive?

The stepped-up basis has been targeted for elimination or modification multiple times. The Biden administration proposed replacing it with a carryover basis system and taxing unrealized gains at death (with certain exclusions). The proposal didn’t pass, but it signaled that the step-up is politically vulnerable — especially given its disproportionate benefit to high-net-worth families.

Any future change would likely include exemptions for smaller estates and family farms, but the specifics matter enormously. If Congress ever moves to a carryover basis system, families with highly appreciated assets would need to rethink their entire estate planning strategy. For now, the step-up remains intact, and planning around it — holding appreciated assets until death, avoiding lifetime gifts of high-basis assets — is still the right approach for most families. But keep an eye on the legislative calendar, because this is a provision that generates recurring interest from both parties when they’re looking for revenue.

Sources & References

• 26 U.S.C. § 1014 — Basis of Property Acquired from a Decedent
• 26 U.S.C. § 1015 — Basis of Property Acquired by Gifts
• 26 U.S.C. § 2032 — Alternate Valuation
• 26 U.S.C. § 1250 — Gain from Dispositions of Certain Depreciable Realty
• IRS Form 706 — United States Estate Tax Return
• IRS Publication 551 — Basis of Assets
• IRS — Frequently Asked Questions on Estate Taxes