A Section 1031 like-kind exchange lets a commercial real estate investor defer the capital gains tax that would otherwise be due on the sale of investment property, provided the proceeds are reinvested in like-kind replacement property within a strict timeline. Since the 2017 Tax Cuts and Jobs Act, 1031 exchanges have been limited to real property only — personal property, including equipment and intangibles, no longer qualifies. For real estate, though, the rules remain one of the most powerful tax-deferral tools in U.S. law, allowing investors to compound their equity across multiple properties over decades without recognizing gain at each sale.
The mechanics are governed by two strict deadlines. The investor has 45 days from the sale of the relinquished property to formally identify replacement properties, and 180 days total to close on one of them. Both clocks run from the same starting date and cannot be extended except under a few narrow federally declared disaster provisions. Crucially, the sale proceeds cannot touch the investor's hands — they must flow through a qualified intermediary, an independent third party that holds the funds and executes the replacement purchase. Any deviation from the intermediary structure, including a brief period where the investor controls the funds, blows the exchange and triggers immediate recognition of the deferred gain.
The replacement property must be of equal or greater value and debt must be replaced at least in equal amount, or the investor recognizes gain to the extent of the shortfall. The term for that recognized portion is boot — cash boot when the investor takes money out, and mortgage boot when the replacement debt is lower than the relinquished debt. A partial 1031 is still useful; it defers most of the gain and only triggers recognition on the delta. The three-property rule, the 200% fair market value rule, and the 95% rule each govern how many candidate replacements can be identified within the 45-day window, and most sophisticated exchanges use one of these identification safe harbors.
Beyond the standard deferred exchange, advanced structures include the reverse 1031, in which the replacement property is acquired before the relinquished property is sold using an exchange accommodation titleholder to park title; the build-to-suit exchange, in which construction improvements to the replacement property are funded through the exchange; and the Delaware Statutory Trust structure, which lets smaller investors acquire fractional interests in institutional properties as 1031 replacements without the complexity of direct ownership. Each structure requires careful coordination with qualified intermediaries, lenders, and legal counsel — the cost of getting any step wrong is immediate recognition of the full deferred gain.
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