What Is the Three-Property Rule in Tax-Deferred Exchanges?

The three-property rule in a 1031 exchange lets you identify up to three potential replacement properties after selling your relinquished property, with no cap on their combined fair market value. You must make that identification in writing within 45 days of closing on the sale, and you must acquire at least one of the identified properties within 180 days. It is the most commonly used of the three identification methods allowed under the Treasury Regulations, largely because it is the simplest: count to three and stop.¹

How the Rule Works

You can list one, two, or three replacement properties. That is the entire numerical limit. A $500,000 duplex sale can support the identification of three office buildings at $2 million each, and the identification is still valid.¹ There is no aggregate value calculation to worry about, which is what makes the rule attractive to investors who want to keep two or three deals in play at once.

The property you eventually acquire has to come from your identified list. Buying a fourth property that was not on the list does not qualify, even if it would otherwise be perfect like-kind real estate. And you have to close on at least one identified property within the 180-day exchange period. If none of the three closes, the exchange fails entirely.

You can revoke an identification and replace it, but only before day 45. After the deadline, the list is locked.

The 45-Day Identification Window

The clock starts on the day the relinquished property transfers. From that date, you have exactly 45 calendar days to deliver a signed, written identification.² Weekends, holidays, and unforeseen circumstances do not extend the deadline. The IRS does not grant extensions.

The identification must be a written document you sign and deliver before the deadline to a permissible party. Permissible parties are the seller of the replacement property, the qualified intermediary holding your exchange funds, an escrow agent, or a title company involved in the transaction. You cannot deliver the notice to your employee, attorney, accountant, investment banker, or real estate agent, or anyone else who has served in one of those roles for you within the two years before the exchange. The IRS treats those people as your agents, and delivery to them does not count.¹

Each property has to be described clearly enough to leave no ambiguity. For real estate, that means a legal description, a street address, or a well-known name for the property. “A commercial property in Phoenix” will not satisfy the requirement.¹

One trap worth flagging: the 180-day exchange period ends at the earlier of 180 days after the transfer or the due date (with extensions) of your tax return for the year the relinquished property was sold.³ If you close in late December and your return is due April 15 without an extension, you can lose months from the standard 180-day window. Filing an extension solves it.

Valid Identification Does Not Automatically Mean Full Deferral

The three-property rule governs identification. Full tax deferral is a separate calculation. To defer the entire capital gain, the property you actually acquire must be worth at least as much as what you sold (net of closing costs), and you must reinvest all the cash proceeds.

Say you sell for $1 million, identify three properties at $1.2 million, $900,000, and $750,000, and ultimately buy the $900,000 one. Your identification is valid. But you will owe tax on the $100,000 shortfall, which is treated as taxable boot.²

Boot also shows up when your replacement debt is lower than the mortgage on the property you sold. If you had a $350,000 mortgage on the relinquished property and take on only a $300,000 mortgage on the replacement, the $50,000 in debt relief is taxable, even if you rolled every dollar of cash equity forward. You can offset mortgage boot by putting cash into the deal at closing, but many investors do not realize they need to until it is too late.

When Three Properties Are Not Enough: The 200% Rule

If you want to spread a large sale across more than three replacements, the three-property rule is not your only option. The 200% rule lets you identify any number of replacement properties as long as their combined fair market value does not exceed 200% of the value of what you sold.¹

Sell for $800,000 and the total value of everything on your identification list has to stay at or under $1.6 million. Six properties at $250,000 each would fit. Fair market value is measured as of the end of the 45-day identification period, and exceeding the 200% limit by any amount invalidates the entire identification, not just the excess. A seventh property that pushes the total to $1.65 million voids every identification on the list.

The 95% Safety Net

If you blew past both the three-property limit and the 200% limit, one narrow escape remains. Under the 95% rule, the identification is still valid if you acquire replacement properties worth at least 95% of the total fair market value of everything you identified.⁴

In practice this is very hard to satisfy. Identify ten properties totaling $5 million and you have to close on at least $4.75 million worth. One deal collapsing — a seller pulling out, financing falling through, a failed inspection — can drop you below the threshold with no partial credit at 94%. Treat the 95% rule as an emergency exit, not a plan.

What Happens If Identification Fails

Miss the 45-day deadline, break one of the three identification rules, or fail to close on a replacement within 180 days, and the transaction is no longer a tax-deferred exchange. The IRS treats the sale of the relinquished property as a fully taxable event in the year it closed.²

You will owe federal capital gains tax on the full appreciation, plus a separate tax on depreciation recapture. Depreciation you claimed while you owned the property is recaptured at a maximum rate of 25%, which is typically higher than the long-term capital gains rate on the remaining profit.⁵ High-income taxpayers may also owe the 3.8% net investment income tax on top of both. The gain gets reported on IRS Form 8824.⁶

A failed exchange does not mean anything went wrong legally. It just means you owe the taxes you were trying to defer, often at a moment when the proceeds have already been committed to a replacement property. Getting the identification right in the first 45 days is the single most controllable variable in the process, and the three-property rule is the version of that job most investors can execute cleanly.

1
eCFR. 26 CFR 1.1031(k)-1 – Treatment of Deferred Exchanges
2
Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment
3
Internal Revenue Service. Like-Kind Exchanges Under IRC Section 1031
4
eCFR. 26 CFR 1.1031(k)-1 – Treatment of Deferred Exchanges
5
Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
6
Internal Revenue Service. Instructions for Form 8824