A 1031 exchange time frame is fixed by two deadlines that run at the same time: 45 calendar days to identify your replacement property in writing, and 180 calendar days to close on it, both counting from the day you transfer the property you are selling. The 45-day window sits inside the 180-day window; they are not sequential. Miss either one and the exchange fails, which makes the entire gain on your original sale taxable in that year.
When the Clock Starts
The clock starts the moment you transfer your relinquished property to the buyer. That transfer date is day zero for both deadlines. Every date you later put on Form 8824 is measured from it, and the IRS uses those dates to verify that you met each cutoff.1Internal Revenue Service. Form 8824 Like-Kind Exchanges
Both deadlines count every calendar day, including weekends and federal holidays. There is no grace period and no discretion for individual circumstances. Financing delays, a deal falling apart, or personal hardship do not extend the time frame.
The 45-Day Identification Deadline
You have until midnight on the 45th day to identify the replacement property or properties you intend to acquire.2eCFR. 26 CFR 1.1031(k)-1 – Treatment of Deferred Exchanges The identification has to be in writing, signed, and delivered before that deadline to either the person obligated to transfer the replacement property to you or your qualified intermediary. A street address or legal description is enough to describe real property.3Internal Revenue Service. Like-Kind Exchanges Under IRC Section 1031
If nothing is identified by day 45, whatever you later buy will not qualify for tax deferral, no matter how quickly you close.
You can revoke an identification and substitute a new one, but only while the 45 days are still running. Once the window closes, your list is locked.
How Many Properties You Can Identify
The Treasury Regulations put a ceiling on how many properties can appear on that list. You have to satisfy at least one of three rules, or the identification is treated as if it never happened.
- Three-property rule: up to three properties, with no limit on their combined value. This is the option most investors use, because it leaves room for backup choices if a deal collapses.
- 200-percent rule: any number of properties, provided their total fair market value at the end of the 45 days does not exceed 200 percent of what you sold.2eCFR. 26 CFR 1.1031(k)-1 – Treatment of Deferred Exchanges
- 95-percent rule: if you blow past both of the above, you can still salvage the exchange, but only by actually acquiring properties worth at least 95 percent of the total value of everything you identified. There is almost no margin for a deal to fall through.4eCFR. 26 CFR 1.1031(k)-1 – Treatment of Deferred Exchanges
The 180-Day Closing Deadline
You have to close on the replacement property within 180 calendar days of transferring the relinquished property.5Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment Closing means deed and title actually transfer. Being under contract on day 180 is not enough. If the purchase has not been finalized by the deadline, the exchange fails and the gain from the original sale becomes taxable.
The Tax Return Due Date Can Cut the 180 Days Short
The statute requires the exchange to be completed by the earlier of 180 days or the due date of your tax return, including extensions, for the year in which you sold the relinquished property.5Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment If you sold in October or later, the standard April 15 filing deadline can arrive before your 180 days are up. In that case, April 15 becomes your real deadline unless you take action.
Filing IRS Form 4868 before April 15 pushes the return deadline to October 15 and typically restores the full 180 days.6Internal Revenue Service. IRS: Need More Time to File, Request an Extension The extension is automatic; you do not need IRS approval. Note that it extends the time to file, not the time to pay, so any tax you expect to owe for the year still needs to be paid by April 15 to avoid penalties.
Forgetting the extension is one of the most common ways late-year exchanges collapse. The IRS does not fix it after the fact.
Reverse Exchange Timelines
In a reverse exchange, you acquire the replacement property before selling the old one. The IRS provides a safe harbor for these transactions under Revenue Procedure 2000-37, and the same 45-day and 180-day clocks apply, but from a different starting point.
An exchange accommodation titleholder takes title to the replacement property on your behalf. From the date the titleholder acquires the property, you have 45 days to identify in writing which of your existing properties you will sell, and 180 days to finish the whole transaction by selling that property and taking title from the titleholder. Go past 180 days and the deal falls outside the safe harbor and may not qualify for deferral.
When the Deadlines Can Be Extended
Two narrow situations extend the 45-day and 180-day clocks. Taxpayers serving in the Armed Forces in a designated combat zone receive automatic postponement of both deadlines under Section 7508 of the Internal Revenue Code. Taxpayers affected by a federally declared disaster may receive relief under Section 7508A.7Internal Revenue Service. Revenue Procedure 2018-58
When disaster relief applies, the IRS publishes a notice specifying which areas qualify and how much extra time affected taxpayers get. The relief typically covers anyone who lives, has a principal place of business, or owns exchange property in the designated area.
Outside of those two situations, the IRS does not grant individual extensions. Financing problems, a title issue, a seller backing out, or a non-federally-declared event do not extend the time frame.
Proving You Met the Deadlines
Every 1031 exchange has to be reported on Form 8824, Like-Kind Exchanges, attached to your tax return for the year the exchange began.8Internal Revenue Service. About Form 8824, Like-Kind Exchanges The form asks for the date you transferred the relinquished property, the date you identified the replacement property in writing, and the date you received the replacement property.1Internal Revenue Service. Form 8824 Like-Kind Exchanges Those three dates are the numbers the IRS uses to confirm that both deadlines were met.
A discrepancy between the dates on Form 8824 and the underlying transaction can disqualify the deferral. Keep the written identification letter, the exchange agreement with your qualified intermediary, settlement statements, and recorded deeds. If the exchange is audited, those records are how you show that the 45-day and 180-day windows were honored.