The 1031 exchange timeline, in plain English.
A 1031 exchange lets you sell investment real estate and defer the tax by reinvesting in other real estate. It lives or dies on two deadlines: 45 days to identify the replacement property and 180 days to close on it. This page explains how the exchange works, how the clock actually runs, how many properties you can identify, and what happens when it fails, from the code and the regulations rather than from a brochure.
It is general information, not advice for your sale. The tax side of a specific exchange is what our real estate tax work covers.
Mid-exchange with the clock running? The days do not pause while you read. Start with the same call.
What is a 1031 exchange in real estate, and how does it work?
Section 1031 of the Internal Revenue Code says that no gain is recognized when real property held for investment or for use in a business is exchanged solely for other real property of like kind, to be held for the same purposes. In practice almost nobody swaps deeds. You sell to one buyer, a qualified intermediary holds the money, and you buy from a different seller within the deadlines. Because you never take the cash, the law treats it as one exchange rather than a sale and a purchase, and the tax on the gain is deferred into the new property.
Deferred is the right word. The gain does not disappear; your old basis carries into the replacement property under Section 1031(d), so the tax is waiting there until you sell without exchanging. Many owners exchange repeatedly for decades, and the tax is never paid in their lifetime because heirs receive a stepped-up basis. That is a strategy conversation, not something the page can decide for you.
Since the 2017 tax law, only real property qualifies. Equipment, vehicles, artwork and other personal property no longer do. Within real property, “like kind” is broad: raw land for an apartment building, a rental house for a commercial condo, one property for three. What matters is how the property is held, not what type of building sits on it.
The 45-day rule and the 180-day rule run from the same day.
Most sellers picture 45 days and then another 180. The law is stricter: both periods start the day you transfer the property you are selling, so the 180 days include the 45. By the time the identification window closes, you have 135 days left to get to a closing table, and every one of them is a calendar day.
Day 0: the clock starts
The identification period and the exchange period both begin on the date you transfer the relinquished property, which for most sellers is the closing date. If you are selling more than one property in the same exchange, both clocks run from the earliest transfer. Under Treasury Regulation §1.1031(k)-1(b), each period ends at midnight on its final day.
Day 45: identify in writing
By midnight on the 45th day you must have identified the replacement property in a signed, written document delivered to your qualified intermediary or to the seller of the replacement property. The description has to be unambiguous, which in practice means a street address or legal description. You can revoke and re-identify freely until the window closes; after it closes, the list is final.
Day 180, or your return due date
You must receive the replacement property by the earlier of the 180th day or the due date, including extensions, of your tax return for the year of the sale. A sale that closes in the last quarter of the year can run into an April due date before day 180 arrives; filing an extension for the return preserves the full period. Section 1031(a)(3)(B) is where that trap lives.
You transfer the property you are selling. The intermediary receives the proceeds. Both clocks start.
Find, negotiate and name the replacement property in writing. Up to three of any value, or more under the 200-percent rule.
The list is locked. Nothing can be added. If nothing was identified, the exchange has already failed and the intermediary may release the funds.
Close on one or more of the identified properties. Inspections, financing and the seller’s own problems all have to fit inside this window.
Or your return due date, whichever comes first. Whatever has not closed is a taxable sale. There is no appeal and no do-over.
Why sellers miss it: the properties they identified fall through. An inspection turns up a problem, a lender slows down, a seller changes their mind, and by the time it happens the identification window has closed and there is no third choice on the list. The timeline looks generous on paper and collapses in practice. That is the reason the third identification slot matters so much, and it is why a fallback lined up before day 45 is the difference between a completed exchange and a tax bill.
How many properties can you identify in a 1031 exchange?
Treasury Regulation §1.1031(k)-1(c)(4) gives you three ways to identify, and you only need to satisfy one of them. The identification is a signed, written document delivered to your intermediary before midnight on day 45, and any property you actually close on inside the 45 days counts as identified.
The three-property rule
Identify up to three properties, of any value, and buy one, two or all three. This is the rule most sellers use, and the smart way to use it is two real targets and one pre-vetted fallback, so a failed inspection at day 60 is not the end of the exchange.
The 200-percent rule
Identify any number of properties, as long as their combined fair market value on day 45 is no more than twice the value of the property you sold. Useful when you are trading one large property for several smaller ones.
The 95-percent exception
If you over-identify, more than three properties and more than 200 percent of value, the identification survives only if you end up acquiring at least 95 percent of the total value you named. Rarely used, because it forces you to buy almost everything on the list.
A failed 1031 exchange is a fully taxable sale.
Miss the identification window, or reach day 180 without closing, and the sale is taxed as if the exchange never existed: capital gains, depreciation recapture, the net investment income tax and any state tax, all in one year. The intermediary releases the funds, and there is nothing to appeal.
One nuance matters when a sale closes late in the year. If the exchange began in one tax year and failed in the next, so the intermediary paid you in the second year, Treasury Regulation §1.1031(k)-1(j)(2) may allow the gain to be reported in the year you actually received the money, under the installment sale rules, provided you had a bona fide intent to complete an exchange when it began. That does not rescue the exchange, but it can move the tax into the following year. It is a question to raise before the deadline, not after the return is filed.
The partial version is more common than the total failure. You close on one of your identified properties but not the others, or you buy something smaller than what you sold, and the difference comes back to you as taxable boot. A deliberate partial exchange can be a fine decision. An accidental one is a surprise on the return.
Push your first two identified properties as hard as you can; that is the real work, and it is your agent’s job. But use the third slot for an already-vetted, passive replacement that sizes to your sale, so that when your first choices fall through you still complete the exchange instead of paying tax on the entire sale.
Why it works: it is already vetted, so it moves fast when the clock is short; it is passive, so it does not put you back into managing property; and it sizes to your sale rather than forcing you to find one property at or above your price and replace the debt on top. The specifics, including who can participate and how, are for the conversation. How we fit into that.
There is no extension on request. Weekends and holidays count. The IRS postpones the deadlines only for taxpayers affected by a federally declared disaster, under Revenue Procedure 2018-58 and the notice for that disaster. The one lever you do control is your return: if day 180 falls after your filing date, file an extension for the return and you keep the full 180 days.
The parts of a 1031 exchange that create a surprise.
Meeting the deadlines gets you an exchange. Whether it defers all of the tax comes down to three things on the closing statements that nobody at the closing table is responsible for checking.
Boot
Anything you receive that is not like-kind real property: cash left over after the purchase, a reduction in your mortgage debt that is not replaced with new debt or cash, or other property. Under Section 1031(b), boot is taxable to the extent of your gain. Debt relief and new debt are netted, but cash you put in cannot offset cash you take out.
Basis
Your basis does not reset at the purchase price. Under Section 1031(d) the basis of the replacement property is the basis of the property you gave up, reduced by any money received and increased by any gain recognized. Lower basis means less depreciation going forward and a larger gain waiting in the new property, which is the deferral working as designed.
Recapture and reporting
Depreciation recapture is deferred along with the capital gain when the exchange is complete, and comes due with everything else when it is not. The exchange is reported on Form 8824 with your return for the year of the sale, even if the replacement closed the following year. Related-party exchanges under Section 1031(f) carry a two-year holding requirement that undoes the deferral if either side sells early.
The qualified intermediary, the agent, the CPA, and the gap between them.
The qualified intermediary is the safe harbor that makes a delayed exchange possible under Treasury Regulation §1.1031(k)-1(g)(4). It is a company, not a person you know: your attorney, your CPA, your agent, or anyone who has acted for you in the prior two years is a disqualified person and cannot serve. The intermediary holds the proceeds, receives your identification, and pays the seller of the replacement property. It does not advise you on which property to buy or what the tax will be.
What does a 1031 exchange cost? The intermediary’s fee is set by the intermediary and is small next to the tax it defers; reverse and improvement exchanges cost more because someone has to hold title to a property for you. Ask for the fee schedule in writing before you sign the exchange agreement, and ask how the funds are held and insured while the intermediary has them.
Your agent runs the sale and finds the replacements. Your CPA reports the exchange next spring. The question nobody on that list owns is whether the exchange protects your equity, what the tax looks like if it fails, and what the fallback is. That is the layer we add, coordinated with the people you already have. We do not hold exchange funds and we do not give legal advice.
A sale you chose, or a sale you did not.
Section 1031 and Section 1033 both let you replace one property with another and defer the tax, and they are often confused. They cover different events. A 1031 exchange is for a sale you decided to make, and its mechanics are strict: an intermediary holds the money and the deadlines are measured in days. A 1033 exchange is for a disposition you did not choose, most often eminent domain, and the rules are looser in every way that matters: you may hold the proceeds, the replacement window is measured in years, and no intermediary is involved.
The distinction is not academic. Owners facing a taking sometimes rush into a 1031 exchange, with its 45-day clock and its intermediary, when Section 1033 would have given them two to three years and full control of the proceeds. If any part of your sale is compelled, read the 1033 side before you sign an exchange agreement.
Eminent domain tax planning is the other half of our practice. The 1033 Exchange page covers the replacement rules, the election, and the timeline in full. States add their own layer to either exchange; Florida’s is on the 1031 Exchange in Florida page.
1031 exchange rules, answered.
Answered from the code and the regulations. Every situation is different; confirm specifics with your attorney, your CPA, and your intermediary.
Two deadlines run from the day you close on the property you are selling. You have 45 calendar days to identify the replacement property in writing, and 180 calendar days to close on it. The 180-day period is cut short if your tax return for the year of the sale is due first, unless you file an extension for the return. Both clocks start on the same day, so the 180 days include the 45, not follow them. The rules are in Section 1031(a)(3) of the Internal Revenue Code.
Yes. Both periods are counted in calendar days and end at midnight on the 45th and 180th day, whether that day is a Saturday, a Sunday, or a federal holiday. There is no rule that rolls the deadline to the next business day. The only extensions come from IRS disaster relief notices, which apply to taxpayers affected by a federally declared disaster.
Under the Treasury regulations you may identify up to three properties of any value (the three-property rule), or any number of properties as long as their combined fair market value does not exceed 200 percent of the value of the property you sold (the 200-percent rule). If you identify more than that, the identification still holds only if you end up acquiring at least 95 percent of the total value you identified (the 95-percent exception). Most sellers use the three-property rule, and the smart use of it is two real targets plus one fallback.
Not on request. The 45-day and 180-day periods cannot be extended by the intermediary, the closing agent, or the taxpayer. The IRS postpones them only for taxpayers affected by a federally declared disaster, under the procedures in Revenue Procedure 2018-58 and the specific disaster notice. The one thing you can control is the return due date: if your 180th day falls after your return is due, filing an extension for the return preserves the full 180 days.
The sale is treated as an ordinary taxable sale. Capital gains tax, depreciation recapture, the net investment income tax and any state tax fall in the year the exchange fails, with no do-over. If the exchange began in one tax year and the intermediary released the funds in the next, the regulations may let you report the gain in the year you actually received the money, provided you had a bona fide intent to complete an exchange when it started. That is a timing question to raise before the deadline, not after.
Boot is anything you receive in the exchange that is not like-kind real property: cash left over, a reduction in the debt you carry (mortgage boot), or other property. Boot is taxable to the extent of your gain. To defer the whole gain you generally need to buy replacement property of equal or greater value, reinvest all of the net proceeds, and take on equal or greater debt or replace it with cash. Falling short on any of those creates boot, and a partial exchange is the deliberate version of the same thing.
The property you sell and the property you buy must both be real property held for investment or for use in a business, not a primary residence or property held for resale. Since 2018 only real property qualifies. Real property is like-kind to other real property, so land can be exchanged for a building or a rental for a commercial property. The same taxpayer must sell and buy. The proceeds must be held by a qualified intermediary, not by you. And the 45-day and 180-day deadlines must be met. The exchange is reported on Form 8824 with your return for the year of the sale.
Generally no. A 1031 exchange is for property held for investment or business use, and your home is neither. A home sale uses the Section 121 exclusion instead. Property that has been both, for example a home that was later rented, can sometimes use both provisions under IRS guidance, and a vacation home can qualify if it meets the IRS safe harbor for rental use. Those are fact-specific, and the answer depends on the years of use.
A reverse exchange is when you acquire the replacement property before you sell the property you are giving up. Because you cannot own both at once and still qualify, an exchange accommodation titleholder takes title to one of the properties under the IRS safe harbor in Revenue Procedure 2000-37. The same 45-day and 180-day periods apply, counted from the day the accommodation titleholder takes title. Reverse exchanges cost more and take more coordination than a standard deferred exchange.
On IRS Form 8824, Like-Kind Exchanges, filed with your federal return for the tax year in which you sold the relinquished property, even if the replacement property closed in the following year. The form reports the properties, the dates, any boot, the gain realized and recognized, and the basis carried into the replacement property. Your CPA prepares it from the closing statements and the intermediary’s records.
- 26 U.S.C. §1031 — Exchange of real property held for productive use or investment (the 45-day and 180-day rules are in subsection (a)(3); boot in (b); basis in (d); related parties in (f)).
- Treas. Reg. §1.1031(k)-1 — Treatment of deferred exchanges: the identification and exchange periods (b), the identification rules (c), the qualified intermediary safe harbor (g)(4), and exchanges that straddle two tax years (j)(2).
- IRS Form 8824, Like-Kind Exchanges, and its instructions.
- Rev. Proc. 2000-37 — the safe harbor for reverse (parking) exchanges.
- Rev. Proc. 2018-58 — the list of deadlines, including the 1031 periods, that the IRS may postpone after a federally declared disaster.
This page is general information about Section 1031 of the Internal Revenue Code. It is not tax, legal, or investment advice, and it does not describe or offer any investment. Your outcome depends on facts specific to your property and your return; confirm them with your own advisors.