1031 exchange explained
A 1031 exchange defers capital gains tax when you sell an investment property and buy another. The tax does not disappear — it moves to the replacement property and becomes payable when that is eventually sold outside an exchange.
The mechanism is simple. The deadlines are absolute, and most failed exchanges fail on procedure rather than on eligibility.
This article is orientation, not advice. A 1031 exchange requires a qualified intermediary and a tax adviser engaged before the sale closes, and the cost of getting it wrong is the entire deferred tax.
The two deadlines#
They run concurrently from the day the relinquished property closes, and neither can be extended.
| Day | Requirement |
|---|---|
| 0 | Sale of the relinquished property closes |
| 45 | Replacement property formally identified, in writing, to the intermediary |
| 180 | Purchase of the replacement property completed |
The 180 days is not 180 days after the 45. It is 180 from the same starting point, so identifying on day 45 leaves 135 days to close.
And there is a third limit few people notice: the exchange must complete by the due date of your tax return for the year of the sale, including extensions. A sale late in the year can shorten the 180 days unless the return is extended.
No extension exists for a failed closing, a lender delay, a title problem or a seller who changes their mind. The only relief is IRS-declared disaster relief, which is not a plan.
The identification rules#
Within 45 days, in writing, signed, delivered to the intermediary. You may use one of three rules.
Three property rule. Identify up to three properties of any value. The most common approach by a wide margin.
Two hundred percent rule. Identify any number of properties, provided their total value does not exceed 200% of what you sold.
Ninety-five percent rule. Identify any number of any value, provided you actually acquire at least 95% of the total value identified. Rarely used, and unforgiving.
Identification must be unambiguous — a street address or legal description, not "a duplex in Minneapolis". Vague identification is treated as no identification.
You can change the list within the 45 days. After day 45 it is fixed, and if none of the identified properties can be acquired, the exchange fails.
What qualifies#
Real property held for investment or for productive use in a trade or business, exchanged for other real property held for the same purpose.
Like-kind is broad for real estate. An apartment building for raw land, a retail unit for a rental house, a farm for an office. Almost any real property held for investment qualifies as like-kind to almost any other.
What does not qualify:
| Excluded | Why |
|---|---|
| Your primary residence | Not held for investment |
| A second home, generally | Personal use, unless it meets safe-harbour rental tests |
| Property held for resale | Inventory — flips and wholesale deals |
| Stock, partnership interests, securities | Not real property |
| Equipment and personal property | Excluded since 2018 |
| Foreign real property for US property | Not like-kind to each other |
The flip exclusion catches people. There is no statutory holding period, and short holds with evident resale intent are the pattern challenged. An investor who buys, renovates and sells within months is a dealer holding inventory, and inventory does not qualify.
Two years is often cited as a safe holding period. It is a convention drawn from other provisions rather than a rule in §1031, and intent matters more than the calendar.
The qualified intermediary#
You cannot touch the money. An investor who takes actual or constructive receipt of the proceeds has made a sale, and no subsequent purchase converts it back into an exchange.
The intermediary holds the proceeds, is assigned into both contracts, and acquires and transfers the properties.
Who cannot serve: your agent, attorney, accountant, employee or a relative, if they have acted for you in the two years before the exchange. The rules on disqualified persons are specific and they exist to keep the intermediary independent.
Engage them before the relinquished sale closes. Not after. Once the closing has funded to you, it is too late and there is no remedy.
Check how they hold funds. Qualified intermediaries are lightly regulated in most states, and there have been failures where client funds were lost. Segregated accounts, a fidelity bond and errors-and-omissions cover are reasonable questions.
Boot, and trading down#
Boot is anything received that is not like-kind property, and it is taxable to the extent of the gain.
Cash boot. Proceeds not reinvested. Sell for $500,000 and buy for $440,000, and the $60,000 difference is boot.
Mortgage boot. Debt relief. Sell a property with a $300,000 mortgage and buy one with a $250,000 mortgage, and the $50,000 reduction is treated as boot even though no cash changed hands.
The general rule for a fully deferred exchange: acquire property of equal or greater value, reinvest all the net proceeds, and take on equal or greater debt — or add cash to make up any debt shortfall.
| Scenario | Result |
|---|---|
| Buy higher value, more debt, all proceeds reinvested | Full deferral |
| Buy lower value | Cash boot, taxable |
| Buy with less debt, no cash added | Mortgage boot, taxable |
| Buy with less debt but add cash to cover it | Full deferral |
| Take some cash out at closing | That cash is boot |
Partial deferral is available. An exchange with some boot still defers the rest, which is often the right answer for someone who wants to extract some capital.
Reverse and improvement exchanges#
A reverse exchange buys the replacement before selling the relinquished property. You cannot own both and still qualify, so an exchange accommodation titleholder takes title to one of them while the other transaction completes.
More complex, more expensive, and the same 45 and 180 day deadlines apply, running from the accommodation titleholder taking title.
Useful when the replacement property will not wait — a specific asset that must be secured before your sale closes.
An improvement or construction exchange allows exchange proceeds to fund improvements on the replacement property, with the accommodation titleholder holding title while the work is done. Improvements must be completed within the 180 days to count toward the exchange value, which is a genuine constraint on anything substantial.
Where exchanges fail#
Missing day 45. The most common failure and the most complete.
Ambiguous identification. A list that does not identify property clearly enough to be enforced.
Taking receipt of proceeds. Including having the closing wire funds to you "just for a few days".
Trading down without realising. Particularly on debt, where mortgage boot is invisible in the cash column.
A failed replacement purchase after day 45, with no alternative identified.
Using a disqualified intermediary, including a longstanding attorney or accountant.
Holding the wrong kind of property, most often a flip treated as investment.
Exchanging between different taxpayers. The entity that sells must be the entity that buys. A property sold by an LLC and bought personally is not an exchange, and this catches investors who restructure mid-transaction.
State tax, and Minnesota#
Most states follow the federal treatment and defer state capital gains alongside it. Minnesota conforms to §1031 for real property.
Some states claw back. California and a few others require ongoing reporting where an exchange moves value out of state, and tax the deferred gain when it is eventually recognised. An investor exchanging out of one of those states should check the specific rule.
Depreciation recapture is also deferred in an exchange, and it is taxed at a higher rate than capital gain when eventually recognised. On a property held for many years, recapture can be the larger part of the bill, which is one reason some investors continue exchanging rather than ever selling.
A worked exchange#
Concrete numbers, because the deferral is easier to understand as an amount than as a concept.
The sale. A duplex bought nine years ago for $180,000, sold for $420,000. Depreciation taken over the hold: $52,000. Mortgage balance $118,000. Selling costs $27,000.
| Line | Amount |
|---|---|
| Sale price | $420,000 |
| Selling costs | −$27,000 |
| Net sale proceeds | $393,000 |
| Original basis | $180,000 |
| Less depreciation taken | −$52,000 |
| Adjusted basis | $128,000 |
| Total gain | $265,000 |
| — of which depreciation recapture | $52,000 |
| — of which capital gain | $213,000 |
If sold outright, tax is due on both components, and recapture is taxed at a higher rate than long-term capital gain. Add state tax where applicable. The bill is substantial and it is paid from the proceeds.
If exchanged, none of it is due now. The full $393,000 of net proceeds — less the $118,000 mortgage payoff, so $275,000 of equity — moves into the replacement property.
To defer fully, the replacement must be at least $420,000 in value with at least $118,000 of debt, and all $275,000 of equity reinvested.
Buy at $500,000 with $225,000 of debt: fully deferred.
Buy at $380,000: $40,000 of cash boot, taxable.
Buy at $450,000 but with only $90,000 of debt and no cash added: $28,000 of mortgage boot, taxable, even though the price went up.
The deferred tax is capital that keeps working. On this exchange it is a five-figure sum compounding in a larger property rather than paid to the Treasury — which is the entire case for doing it, and it only holds if the replacement property was worth buying.
The exchange calendar in practice#
The deadlines look generous on paper and are not, because the clock starts at a closing you may not control.
| Point | What has to be true |
|---|---|
| Before listing | Intermediary engaged, adviser briefed |
| Before the sale contract | Exchange cooperation clause in the contract |
| Before closing | Intermediary assigned into the contract |
| Day 0 | Sale closes; proceeds go to the intermediary, not to you |
| Days 1–45 | Find, inspect and secure replacement candidates |
| Day 45 | Written identification delivered — no extension |
| Days 45–180 | Close on an identified property |
| Day 180 | Purchase completed — no extension |
The pressure sits in days 1 to 45. Finding, inspecting and getting a property under contract in six weeks is achievable in a normal market and hard in a competitive one, and there is no relief for a market with no inventory.
Which is why the sensible order is reversed: start looking for replacement property before listing the relinquished one, so day 0 begins with candidates already identified rather than with a search.
And build slack into the second half. Aiming to close by day 150 leaves thirty days for a lender delay, a title defect or a failed inspection. Aiming to close on day 179 leaves nothing.
The exchange cooperation clause matters. Both contracts should acknowledge the exchange and require the other party to cooperate at no cost to them. It is standard language, it costs nothing, and its absence is how a buyer or seller refuses to sign an assignment at the worst moment.
Is it worth doing#
The cost. Intermediary fees are modest, typically a flat fee plus a small charge per property. Reverse and improvement exchanges cost several times more.
The benefit. Deferring the tax keeps the whole of the proceeds working. On a substantial gain, the deferred tax is capital compounding in the replacement property rather than sitting with the Treasury.
The constraint. The deadlines force a purchase on a timetable rather than on opportunity. Investors regularly overpay for replacement property because day 45 is approaching, and an exchange that saves tax by buying badly has saved nothing.
The honest test: would you buy the replacement property at that price if there were no exchange? If not, paying the tax and waiting is frequently the better decision, and it is the one nobody selling exchange services will suggest.