A 1031 exchange defers capital gains tax by treating the sale of an investment or business property and the purchase of a replacement property as a single continuous transaction rather than two separate taxable events. Instead of the seller receiving cash and owing tax on the gain, the proceeds move through a qualified intermediary directly into a new property, and no gain is recognized in the year of the transaction as long as the exchange follows the rules on timing, property type, and how the funds are handled along the way.
Why Touching the Proceeds Breaks the Deferral
The single requirement that trips up more exchanges than any other is that the seller can never take actual or constructive receipt of the sale proceeds; the funds have to go from closing directly to a qualified intermediary, who holds them until they're used to acquire the replacement property. If the money passes through the seller's own account, even briefly, the exchange fails and the full gain becomes taxable in that year. This is why the intermediary is engaged before the original property closes, not after, and why the exchange agreement needs to be in place ahead of the sale.
The 45-Day and 180-Day Clocks
Once the relinquished property closes, the seller has 45 calendar days to formally identify potential replacement properties in writing, and 180 calendar days total, running from the same closing date, not from the identification deadline, to close on the replacement. Both clocks run concurrently and are not extended for weekends, holidays, or a slow closing process, which is the most common way a well-intentioned exchange fails in practice. For a Park City-area investor selling in a tight local market, identifying replacement candidates before or immediately at closing, rather than starting the search after the clock has already started, is what keeps both deadlines realistic.
What Counts as Like-Kind Property
Since 2018, the like-kind requirement applies only to real property held for investment or business use, not personal residences, and the definition is broad within that category: a Park City retail building can exchange into an industrial property, a multifamily building, or a DST allocation, as long as both sides of the transaction are qualifying real property held with investment or business intent. What does not qualify includes primary residences, most personal property, and property held primarily for resale, such as fix-and-flip inventory.
Where the Deferred Gain Actually Goes
The gain is not eliminated; it is carried forward into the replacement property's basis, which is generally lower than what a direct purchase would produce, since it reflects the original property's cost reduced by the deferred gain and any depreciation already claimed. That lower basis means less future depreciation on the replacement and a larger gain if the replacement is ever sold outright without another exchange. Some investors exchange repeatedly for decades, continuously deferring, while others eventually hold a property until death, at which point the step-up in basis can eliminate the accumulated deferred gain for heirs entirely.
A partial exchange is also allowed: reinvesting only part of the proceeds defers only that portion of the gain, with the remainder, called boot, taxable in the year of the sale.
What Has to Be True for the Exchange to Hold Up
- A qualified intermediary is engaged before the relinquished property closes
- Replacement property is identified in writing within 45 days of closing
- The replacement purchase closes within 180 days of the original closing
- Both properties are held for investment or business use, not personal use
- Equal or greater value and debt are reinvested to avoid taxable boot
Missing any one of these generally causes the IRS to treat the transaction as a straightforward taxable sale, so the exchange agreement and intermediary should be lined up well before the original property goes under contract, not after.
Common 1031 Exchange Questions
Does a 1031 exchange eliminate capital gains tax permanently
No, it defers the gain by carrying it into the replacement property's basis; the tax becomes due if the replacement is later sold outright without another exchange, though a step-up in basis at death can eliminate it for heirs.
What happens if I receive the sale proceeds before buying the replacement property
Receiving the proceeds directly, even briefly, disqualifies the exchange; funds must move from closing to a qualified intermediary and then to the replacement purchase without passing through the seller's control.
How much time do I have to complete a 1031 exchange
Replacement property must be identified in writing within 45 days of the relinquished property's closing, and the purchase must close within 180 days of that same closing date, with both deadlines running concurrently.
Can I exchange a Park City commercial property for a different type of real estate
Yes, since 2018 the like-kind requirement applies broadly to real property held for investment or business use, so a retail building can exchange into industrial, multifamily, or a DST allocation, among other qualifying property types.
What is boot in a 1031 exchange
Boot is any portion of the transaction value not reinvested into qualifying replacement property, such as cash taken out or reduced debt not replaced; it is taxable in the year of the exchange even though the rest of the gain is deferred.
