Stepped-up basis is what turns “tax-deferred” into “tax-free” — and when you combine it with Section 121 and Section 1031, you have a lifetime investing strategy that shelters gains on a primary residence, defers gains on every investment property you ever sell, and then wipes the slate clean at death.
How Basis Works Before the Step-Up
To understand why the step-up matters, you need to know what basis is and how it erodes. When you buy a duplex for $285,000 with $10,000 in acquisition costs, your basis starts at $295,000. Spend $30,000 improving it and basis rises to $325,000. But then you start depreciating — and depreciation works against you. With $50,000 assigned to non-depreciable land, you have a depreciable basis of $275,000, spread over 27.5 years: $10,000 per year. After five years of rental income, you’ve claimed $50,000 in depreciation and your basis has fallen to $275,000. Every dollar of depreciation claimed is a dollar of gain waiting to be taxed when you sell — at depreciation recapture rates, not ordinary capital gains rates.
That’s the problem Section 1031 was built to solve.
What Each Tool Does That the Others Cannot
Section 121 shelters gain on a primary residence — up to the limits the code allows. It does one job well and nothing else. It won’t help you on investment property.
Section 1031 defers capital gains and depreciation recapture when you sell investment property and replace it with like-kind investment property. Keep exchanging, and the deferred gain rides along inside every replacement property you acquire. The tax bill grows, but it never comes due as long as you keep exchanging. Section 1031 cannot touch your primary residence.
Stepped-up basis — governed by IRC Section 1014 — resets the basis of inherited property to its fair market value as of the date of death. Whatever deferred gain was locked inside the property simply disappears. The heir’s basis is the value on the day they inherit it, not the original purchase price minus decades of depreciation. This is the only tool that eliminates tax liability rather than deferring it, and it is only available for inherited property — not purchased property, not gifted property.
The Gifted-Property Trap
Gifting property does not trigger a step-up. Under IRC Section 1015, a recipient of gifted property takes the same basis the donor had — the carryover basis. If your basis has been ground down by years of depreciation, you hand that problem directly to the person you’re trying to help. The step-up only arrives through inheritance.
How Title and Entity Choice Determine What the Heirs Actually Receive
The step-up isn’t automatic in every situation — how you hold title matters enormously.
In a community property state (Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin — plus Alaska by opt-in), when one spouse dies, the entire property receives a stepped-up basis, including the surviving spouse’s own share. In a joint tenancy arrangement outside those states, only the deceased spouse’s share steps up; the survivor’s share retains its cost basis.
Corporations are a dead end for this purpose — when a shareholder dies, the property inside a C corporation receives no step-up. Partnerships and LLCs, on the other hand, can make an IRC Section 754 election at the death of a partner or member, allowing the entity’s property to receive a stepped-up basis in the hands of the beneficiary. This is why holding investment real estate in an LLC or partnership — rather than a corporation — is a meaningful structural decision, not just a liability question.
The Lifetime Plan in Sequence
Live in a home, sell it, shelter the gain under Section 121. Roll the proceeds into investment property and defer the gain through Section 1031 exchanges — once, or a dozen times over a career. Each exchange resets the clock without triggering tax. At death, the heirs inherit the final replacement property at its fair market value on that date. The accumulated deferred gain — capital gains and depreciation recapture built up over a lifetime — is extinguished. Tax-deferred becomes tax-free.