What is a 1031 exchange?
A 1031 exchange lets an investor sell real property held for investment and defer the gain by acquiring replacement real property through a qualified intermediary, identifying candidates within forty-five days of the sale and closing within one hundred eighty days. The deferred gain carries into the new property's basis. Primary residences, inventory, and property outside the United States do not qualify, and the deadlines are not extended.
Key points
- A 1031 exchange defers gain on the sale of investment real property when the proceeds are reinvested in replacement real property through a qualified intermediary.
- The seller must identify replacement property in writing within forty-five days of the sale and close within one hundred eighty days; neither deadline is extended.
- Sale proceeds must be held by the qualified intermediary; if the seller receives the money, the exchange fails.
- Cash taken out or a reduction in value or debt, called boot, is taxable even when the rest of the exchange qualifies.
- A primary residence, property held for resale as inventory, and property outside the United States cannot be exchanged under section 1031.
How does a 1031 exchange defer tax?
A 1031 exchange, named for the Code section that allows it, lets a real estate investor sell one investment property and reinvest the proceeds into another without paying tax on the gain at the time of sale. The gain is not forgiven; it is deferred, carried forward into the replacement property as a lower basis. The exchange is reported on Form 8824 with the return for the year of sale.
Done repeatedly, the exchange lets an investor move up in size or quality over the years while keeping the capital that would otherwise go to tax working in the next property. To defer the entire gain, the investor generally must reinvest all of the proceeds, acquire property of equal or greater value, and replace any debt paid off. Cash taken out or a buy-down in value or debt is boot, and that portion is taxable. Partial exchanges are allowed, but tax is owed on the part pulled out.
What are the deadlines and who must hold the money?
The mechanics are strict, and the strictness is the point. Sale proceeds must go to a qualified intermediary, an independent party who holds the funds and prepares the exchange documents, rather than to the seller. If the seller touches the money, the exchange is broken. The intermediary must be engaged before the sale closes.
Two deadlines run at the same time from the sale date. Within forty-five days the investor must identify the replacement property or properties in writing, following the rules on how many properties may be named. Within one hundred eighty days the investor must close on the replacement. These deadlines are firm. They are not extended for weekends, holidays, or a deal that falls through, so lining up candidates early and building in margin is critical.
What does not qualify for a 1031 exchange?
What qualifies is narrower than many investors assume. Both the property given up and the property received must be real property held for investment or for productive use in a trade or business. A primary residence does not qualify. Property held mainly for resale, such as a flipper's inventory, does not qualify. Property located outside the United States cannot be exchanged for property inside it.
Since the 2017 tax law, only real property qualifies; equipment, vehicles, and other personal property are excluded. Intent to hold the replacement for investment matters, and a quick resale after the exchange can undermine that intent. A vacation home used personally may qualify only if personal use is limited and the property is genuinely rented.
Why do long-term investors combine exchanges with a step-up at death?
The long-term appeal is deferral compounding over time. Each exchange rolls the gain forward, and if the investor holds the final property until death, the basis step-up rules under section 1014 can reset the basis for the heirs and eliminate the deferred gain entirely. Deferral during life plus a step-up at death is why serious investors treat the 1031 exchange as a cornerstone of long-term planning rather than a one-time technique.
Because the rules are unforgiving and the deadlines absolute, plan the exchange before listing the property. A CPA models the gain, the boot, and the reinvestment requirement, and a qualified intermediary is engaged in advance. A missed step or a blown deadline turns a deferred gain into a taxable one with no way to undo it.
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Sources
Related guides: real estate investors

Mena Hemaia, CPA, CIA
Chief Executive Officer, Accountack — West Palm Beach, Florida
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