1031 Tax Exchange Timeline: 45-Day, 180-Day, and Reverse Rules

A 1031 exchange timeline runs on two hard deadlines measured from the day you close on the property you are selling: 45 calendar days to identify your replacement property in writing, and 180 calendar days total to close on that purchase. The two windows run at the same time, not one after the other, so the identification period sits inside the closing period rather than adding to it. Miss either date and the entire sale becomes taxable, with no allowance for weekends, holidays, or hardship outside a narrow disaster exception.¹

When the Clock Starts

Both deadlines are counted from the date the sale of your relinquished property closes. That is day zero. Day one is the following calendar day, and every day after counts the same way, including Saturdays, Sundays, and federal holidays.²

Before that closing happens, a Qualified Intermediary must already be in place under a signed exchange agreement. The QI holds the sale proceeds so the money never reaches you. If it does, even briefly, the IRS treats that as constructive receipt and the exchange fails on day one regardless of what the calendar says.¹

The 45-Day Identification Deadline

From day one, you have exactly 45 calendar days to deliver a signed written notice identifying the replacement property or properties you intend to buy. The notice goes to your Qualified Intermediary or another party involved in the exchange, and each property must be described with enough specificity to remove any ambiguity, meaning a street address or legal description rather than a vague reference.²

Federal regulations give you three ways to stay inside the identification limits:

Three-Property Rule. Identify up to three properties regardless of their value. This is the most commonly used option because it requires no math.
200% Rule. Identify any number of properties, provided their combined fair market value does not exceed twice the sale price of the relinquished property. Sell for $500,000, and the identified list can total up to $1,000,000.
95% Rule. Identify any number of properties at any total value, but actually close on at least 95% of that identified value. Falling short on even one purchase can sink the whole exchange, which is why this option is rarely practical.

Exceeding any of the limits disqualifies the entire identification, which collapses the exchange.³

You can change your mind inside the 45 days. A written revocation that clearly identifies the property being removed, delivered to your QI before the 45th day expires, lets you substitute a different property. Once day 46 arrives, the list is locked. Certified mail receipts and digital timestamps are the cleanest way to prove delivery on time.

The 180-Day Closing Deadline

From that same day zero, you have 180 calendar days to complete the purchase of the replacement property. This is not six months, which can be a few days longer on the calendar, and it is not 180 business days. Every weekend and federal holiday counts against the 180.²

All closing documents must be recorded before midnight on the 180th day. At that point the QI wires the exchange funds directly to the closing or escrow agent; the money still cannot pass through your hands.¹

The Tax Return Trap

A second deadline can shorten the 180 days. If your federal tax return for the year of the sale is due before day 180 arrives, the exchange must close by the earlier date. The statute measures this “with regard to extension,” so a timely filed tax extension restores the full 180 days.²

This catches sellers who close late in the year. Sell in November, and your 180 days run into May. Without an extension, the default April 15 filing deadline cuts the exchange short. Experienced exchange professionals treat the extension as nearly automatic in that situation.

Disaster and Military Postponements

The IRS states that the deadlines “cannot be extended for any circumstance or hardship except in the case of presidentially declared disasters.”¹ Even then, the postponement is not automatic. A FEMA declaration by itself does not move your 45-day or 180-day dates. The IRS must issue a separate disaster relief notice that specifically covers 1031 deadlines in your area. If you are in a declared zone, contact your QI and confirm whether an IRS notice applies to your exchange.

Things That Can End the Timeline Early

Even inside the 180 days, certain missteps end the exchange immediately.

Constructive receipt is the most abrupt. If any of the sale proceeds reach you, or reach an account you control, before they fund the replacement purchase, the exchange is over. The QI structure exists precisely to prevent this.¹

Taxpayer identity is the second trap. The same taxpayer who sold the relinquished property must acquire the replacement, and the IRS tracks this by Tax Identification Number rather than by the name on the deed. Sell as an individual and try to buy through a newly formed multi-member LLC, and the IRS sees two different taxpayers and the exchange breaks. A single-member LLC works because it is a disregarded entity that looks through to its owner’s tax ID.

Reverse Exchange Timeline

When the replacement property appears before you have sold the old one, a reverse exchange lets an Exchange Accommodation Titleholder take title to the new property and “park” it until the sale of your existing property closes. Revenue Procedure 2000-37 provides the safe harbor for this arrangement.⁴

The same 45-day and 180-day figures apply, but the clock starts on the date the EAT takes title to the parked property rather than on a sale closing. Within 45 days, you must identify the property you plan to sell (not buy, since the replacement is already parked). Within 180 days, the parked property must be transferred out of the arrangement to you, which requires the old property to be sold and the exchange completed. If the safe harbor requirements are not met, the IRS evaluates the transaction on its own merits and 1031 treatment is at risk.⁴

The Two-Year Clock for Related-Party Exchanges

If you exchange with a family member, a business entity you control, or another related party, the 45-day and 180-day rules still apply, but a two-year holding requirement bolts on afterward. If either party disposes of the property received in the exchange within two years of the last transfer, the deferred gain snaps back and becomes taxable as of the date of that disposition.²

Because of this, Form 8824 must be filed for the year of the exchange and for the two years that follow, so the IRS can track whether the holding period stays intact.⁵

What Missing a Deadline Costs

There is no partial credit. Miss the 45-day identification, fail to close by day 180, take constructive receipt of funds, or break any other structural requirement, and the IRS treats the original sale as a fully taxable event. You owe capital gains tax, depreciation recapture, and potentially penalties and interest.¹

The most common failure point is the 45-day window. Forty-five days feels generous until a deal collapses on day 30 and the search for alternatives starts over. Experienced investors often identify the full three-property maximum as a safety net even when they strongly prefer one. The second most common failure is a closing delay past day 180 caused by financing, title, or seller issues on the replacement side. Unlike most real estate closings, this deadline does not move by a single day.

A failed exchange does not mean the QI keeps the money. The funds return to you; they simply lose their tax-deferred status. The gain is reported on your tax return for the year the original sale occurred, and any boot analysis becomes moot because the whole transaction is now taxable.

Filing the Exchange With the IRS

Form 8824 is filed with your tax return for the year the relinquished property was sold. It documents the dates the deadlines were met, the properties involved, and the calculation of any recognized gain. The QI provides a final accounting of every dollar that moved through the exchange account, and those records feed directly into the form.⁵

1
Internal Revenue Service. Like-Kind Exchanges Under IRC Section 1031
2
Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment
3
eCFR. 26 CFR 1.1031(k)-1 – Treatment of Deferred Exchanges
4
Internal Revenue Service. Revenue Procedure 2000-37
5
Internal Revenue Service. 2025 Instructions for Form 8824