How Long Do You Have to Identify Property in a 1031 Exchange?

The 1031 exchange identification period is 45 calendar days, measured from the date you transfer your relinquished property to the buyer. That deadline is fixed by federal tax law. Weekends and holidays do not push it. Personal circumstances do not push it. Miss it by a day and the exchange fails, and the sale becomes fully taxable.¹

When the 45-Day Clock Starts

The clock starts on the day you transfer the relinquished property, not the day you sign a contract or list the property for sale.¹ From that transfer date, count 45 calendar days forward. If day 45 falls on a Saturday, Sunday, or federal holiday, the deadline still stands. You do not get the next business day.

The one recognized exception is a federally declared disaster. Under IRS guidance, if the relinquished or replacement property sits in a covered disaster area, or if a key party to the transaction (your qualified intermediary, title company, or lender) is located there and unable to perform, the IRS may extend the deadline by up to 120 days or to a specific relief date, whichever is later.² Outside a declared disaster, no hardship argument buys extra time.

How to Make a Valid Identification

Your identification has to be in writing, signed by you, and delivered before midnight on day 45. The IRS accepts delivery to your qualified intermediary or to the seller of the replacement property. It explicitly rejects delivery to your own attorney, real estate agent, accountant, or any other person acting as your agent.² Handing a list to your own CPA does not count, and that mistake has killed exchanges.

Each property on the list must be described clearly enough that there is no ambiguity. For real estate, that means a street address, a legal description, or a well-known distinguishable name.² Something vague like “a rental in Denver” will not hold up.

How Many Properties You Can Identify

Federal regulations cap how many replacement properties you can name and at what value. You only need to satisfy one of three rules.

Three-property rule. You can identify up to three replacement properties regardless of their individual or combined value. This is the simplest approach and the one most investors use.³
200-percent rule. You can identify more than three properties, but their combined fair market value cannot exceed 200 percent of what you sold.³
95-percent rule. You can identify any number of properties at any total value, but you must actually acquire at least 95 percent of the aggregate value of everything you identified. In practice this is almost impossible to satisfy unless you plan to close on nearly every property on your list.

Most investors stay with the three-property rule. It gives room to name a backup or two without dragging in complicated value calculations.

Property Still Under Construction

You can identify a replacement property that has not been built yet or is being renovated. The construction has to be substantially complete by the end of your 180-day exchange period. If the building is only partially finished on day 180, you can only exchange into the portion complete at that point, which may leave you with a smaller deferral than planned.

How the 45-Day Period Connects to the 180-Day Deadline

A second deadline runs at the same time. From that same transfer date, you have 180 calendar days to close on one or more of the properties you identified.¹ The two clocks run together, not in sequence. If you use all 45 days finalizing your identification list, you have 135 days left to close.

There is a wrinkle here that catches people. The law requires the exchange to be completed by the earlier of 180 days after the sale or the due date of your federal tax return (including extensions) for the year the sale occurred.¹ Sell in late October, and an April 15 return due date leaves you fewer than 180 days unless you file an extension. Filing an extension is free and straightforward, and it is standard practice for anyone doing a late-year exchange.

What Happens If You Miss the Identification Deadline

There is no partial credit. If you fail to identify a replacement property within 45 days, the exchange is treated as though it never existed. The entire gain from the sale becomes taxable in the year of the sale.²

The tax hit can be steep. For 2026, federal long-term capital gains rates run up to 20 percent depending on taxable income. Any depreciation you claimed on the property is recaptured at a flat 25 percent federal rate. High-income investors may also owe the 3.8 percent net investment income tax. Combined, these layers can easily consume 30 percent or more of your profit. If a failed exchange also triggers a late payment because you were not expecting a tax bill, interest and penalties add to the damage.

Practical Steps to Protect the 45-Day Window

Line up your qualified intermediary before you close on the sale, because that is who your written identification goes to. Start looking at replacement properties well before the transfer date rather than after. Track day 45 on a calendar the moment your relinquished property transfers, and treat any date on or after day 40 as the trigger for delivering a final signed list. Deliver the identification directly to the intermediary or the seller of the replacement property, and keep proof of delivery. If you are working with more than three candidates, know before you sign the list which of the three identification rules you are relying on, and make sure your list actually satisfies it.

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