The short answer: taxes deferred through 1031 exchanges are not merely postponed. Under current law, when you pass exchanged real estate to your heirs, their cost basis "steps up" to fair market value on the date of death, and the capital gains and depreciation recapture you deferred over a lifetime are generally eliminated. Exchange after exchange, then hold: advisors call it "swap 'til you drop," and it is one of the most powerful legal wealth-transfer strategies in the tax code.
There is a moment in nearly every planning conversation we have with owners in their sixties and seventies: the moment they realize the deferred tax they have been quietly dreading may never be owed by anyone. It changes the entire decision framework. Selling to "finally pay the tax and be done with it" stops looking prudent and starts looking expensive. This article explains how the step-up works, what the arithmetic looks like across a generation, and how DSTs and 721 exchanges fit as the final chapters of the strategy.
How the step-up in basis works
Your cost basis is what you paid for a property, adjusted downward by depreciation and carried forward through every 1031 exchange you complete. Decades of exchanging can leave a large portfolio sitting on a very small basis, with a correspondingly large deferred gain. When you die, that history is wiped clean: your heirs' basis in the inherited property is reset to its fair market value at your death. The deferred capital gains disappear. The accumulated depreciation recapture disappears with them. If your heirs sell soon after inheriting, there is typically little or no taxable gain at all, and if they keep the property, they begin depreciating it fresh from the stepped-up value.
The arithmetic across a generation
Consider an owner who bought a duplex in 1998 for $400,000 and exchanged upward over the decades: duplex to fourplex, fourplex to a small retail center, retail center to a diversified set of DST interests now worth $2.6 million, with roughly $1.9 million of deferred gain and recapture embedded in the chain.
| Sell the year before death | Hold through the step-up | |
|---|---|---|
| Deferred gain recognized | ~$1.9 million | $0 |
| Combined federal, recapture, NIIT, and state tax | ~$500,000–$650,000 | $0 |
| What the heirs receive | After-tax proceeds | $2.6M at stepped-up basis |
The difference is not timing. It is half a million dollars or more that either leaves the family or stays in it, determined largely by whether the last sale happened before or after the step-up. Model your own numbers with our Capital Gains Calculator, then subtract that figure from what your heirs would otherwise inherit.
Building the chain: what "swap 'til you drop" looks like in practice
The strategy itself is simple discipline, repeated:
- Never take a taxable sale you don't need. Every disposition of investment real estate runs through a 1031 exchange, preserving the deferral chain. One unplanned taxable sale can recognize decades of accumulated gain at once.
- Trade toward what you want to hold last. Early exchanges chase growth; later exchanges chase simplicity, income, and durability. The final holdings should be assets you are content to own for the rest of your life, because that is the point.
- Mind the mechanics every time. Equal-or-up value, full equity reinvested, debt replaced. The rules do not relax with experience, and accidental boot is taxed at recapture rates first.
Why DSTs are often the final holding
Delaware Statutory Trust interests solve the two problems that plague the last decade of a real estate lifetime. First, management: DSTs are entirely passive, professionally managed institutional real estate, which matters when the owner who fixed every furnace for forty years no longer wants a single tenant call. Second, estate mechanics: fractional DST interests divide cleanly among multiple heirs (three children can inherit three equal shares of everything, rather than fighting over which child gets which building), and each inherited interest receives the same step-up. DSTs are offered to accredited investors through private placement and involve risks including illiquidity, fees, and loss of principal; they fit some situations well and others not at all, and we'll tell you which is which.
The 721 endgame, and its one-way door
Some families take a further step: a 721 exchange (UPREIT), converting DST interests into operating partnership units of a REIT. Units bring diversification across a large portfolio, simpler reporting, and a measure of liquidity heirs often value. Two cautions belong in every 721 conversation. The contribution itself is tax-deferred, but it is a one-way door: OP units cannot be exchanged back into real estate through a future 1031. And selling or converting units during your lifetime is a taxable event. Held to death, however, units generally receive the same step-up treatment. The right sequencing is an estate-planning decision, made with your attorney and CPA, ideally years before it must be executed.
The honest caveats
The step-up in basis is current law, and it has survived repeated reform proposals, but no strategy spanning decades should assume the code is frozen: we structure for flexibility, not for one statute. The step-up eliminates income tax on deferred gains; it does not eliminate estate tax, which applies above the federal exemption and in some states. Community-property states treat a surviving spouse's step-up more generously than others. None of this changes the core logic; all of it belongs in a plan drawn with your estate attorney and CPA at the table.
Frequently asked questions about the step-up in basis
Does the step-up eliminate depreciation recapture too?
Generally yes. The basis reset at death eliminates the deferred capital gains and the accumulated depreciation recapture. Heirs also restart depreciation from the stepped-up value if they keep the property.
Do DST interests receive a step-up in basis?
Yes. Beneficial interests in a DST are treated as direct ownership of real estate for tax purposes, and inherited interests receive a step-up to fair market value under current law.
What happens if my heirs sell immediately?
If they sell at or near the date-of-death value, there is typically little or no taxable gain, because their basis equals that value. Any post-death appreciation is taxable normally.
Does "swap 'til you drop" avoid estate tax?
No. The step-up addresses income tax on deferred gains. Estate tax is a separate system with its own exemption and rates, and large portfolios need planning for both.
Could the step-up rules change?
They could: proposals to limit the step-up surface regularly. That risk argues for flexible structures and current planning with your advisors, not for volunteering a seven-figure tax today to avoid uncertainty tomorrow.