"Defers" is the operative word, and it's worth sitting with before anything else. A 1031 exchange doesn't erase the capital gains tax on a Scottsdale property sale, and it doesn't create some special exemption for real estate investors. It postpones the tax by carrying the original gain forward into a new property's basis, where it stays until that replacement property is eventually sold outside of another exchange. Understanding that mechanism, rather than the shorthand version people repeat, is what keeps an exchange from going sideways.
The Basis Mechanics Behind the Deferral
When a property is exchanged instead of sold outright, the replacement property doesn't get a fresh basis equal to its purchase price. Instead, it inherits an adjusted version of the relinquished property's basis, carried forward and adjusted for any additional cash the investor puts in or debt taken on. That carried-over basis is exactly why the tax is deferred rather than gone: the gain that would have been recognized on the sale is baked into the new property, and it resurfaces if that property is later sold in a taxable transaction.
What Has to Happen for the Deferral to Hold
The IRS conditions the deferral on a specific sequence, not just an intention to reinvest. A qualified intermediary has to hold the sale proceeds; the investor can never have direct access to the cash between closings, or the exchange fails outright, a rule known as constructive receipt. Replacement property has to be formally identified within 45 days of the relinquished property's closing, and the purchase has to close within 180 days of that same closing. Both properties have to be held for investment or business use, not a primary residence, and the replacement has to be equal or greater in value and debt to fully defer the gain.
Why Partial Deferral Happens More Often Than People Expect
An exchange doesn't have to be all-or-nothing, but a partial one produces a partial deferral. If an investor takes any cash out at closing, called cash boot, or replaces a property with less debt than the one sold, called mortgage boot, that portion of the gain is recognized and taxed in the current year even though the rest of the exchange proceeds. Scottsdale investors sizing a replacement property, whether a directly held asset or a DST allocation, should run the boot calculation before signing anything, since the deferral amount is only as complete as the numbers actually line up.
Where the Deferred Gain Eventually Goes
Some investors exchange repeatedly across a career, each time carrying the accumulated deferred gain into the next property, and let it continue compounding untaxed as long as they keep exchanging rather than cashing out. Others eventually sell outright and pay the accumulated tax in one year. And some hold until death, at which point heirs generally receive the property with a stepped-up basis that can extinguish the deferred liability for income tax purposes. Which path makes sense depends on the investor's timeline, not a fixed rule, which is exactly why the deferral decision should be revisited at every exchange rather than assumed to be permanent.
Common 1031 Exchange Questions
Does a 1031 exchange eliminate capital gains tax permanently?
No. It defers the tax by carrying the gain forward into the replacement property's basis. The liability resurfaces if that property is later sold outside of another exchange, though it can also be extinguished for income tax purposes if the property passes to heirs at death with a stepped-up basis.
What is boot in a 1031 exchange and how does it affect the deferral?
Boot is any cash or reduced debt an investor receives or ends up with in the exchange, cash boot from taking money out at closing or mortgage boot from replacing a property with less debt. Whatever amount qualifies as boot is taxed in the current year even though the rest of the exchange is deferred.
Can an investor touch the sale proceeds at any point during a 1031 exchange?
No. The proceeds have to be held by a qualified intermediary the entire time between the relinquished property's closing and the replacement property's closing. If the investor has actual or constructive access to the funds, the exchange fails and the full gain becomes taxable.
How long does an investor have to find and close on a replacement property?
45 days from the relinquished property's closing to formally identify replacement property in writing, and 180 days total from that same closing to complete the purchase. Both deadlines are fixed by statute and are not extended for delays in financing or due diligence.
Is a DST a way to defer gain without directly managing a new property?
Yes. A Delaware Statutory Trust interest can qualify as 1031 replacement property, deferring the gain the same way a directly owned property would, while a sponsor handles day-to-day management. It comes with illiquidity and accredited-investor requirements that should be understood before committing funds.
