1031 Exchange Identification Rules
In a delayed 1031 exchange, the identification rule is the front-end deadline that controls what you are allowed to buy. You generally have 45 days from the date you transfer the relinquished property to identify potential replacement property in a signed writing, and you must later receive property that is substantially the same as what you identified. The exchange must then be completed by the earlier of 180 days after the transfer or the due date, including extensions, of your tax return for the year of the transfer (IRS Fact Sheet FS-2008-18).
The hardest part is not usually remembering that there is a 45-day deadline. It is making sure the list fits one of the three identification limits: the three-property rule, the 200% rule, or the 95% exception. A list that is late, unsigned, vague, delivered to the wrong person, or too broad can leave the replacement property outside the exchange rules.
The identification rule in one sentence
For a deferred exchange, replacement property must be identified before the end of the 45-day identification period, and the identified replacement property must be received before the end of the exchange period. Treasury Regulation §1.1031(k)-1 states that, in a deferred exchange, replacement property is treated as not like-kind if it is not identified before the identification period ends or if the identified property is not received before the exchange period ends (Treasury Regulation §1.1031(k)-1 via GovInfo).
That makes identification more than a checklist item. It defines the universe of property that can complete the exchange. If you close on a property that was not properly identified, the property may not count as like-kind replacement property for the deferred exchange.
For 2018 and later years, section 1031 treatment applies only to exchanges of real property held for use in a trade or business or for investment, other than real property held primarily for sale (IRS Form 8824 Instructions). Identifying a property does not cure a property-use problem; the relinquished and replacement properties still need to satisfy the underlying 1031 requirements.
The two deadlines that work together
The 45-day identification period starts when you transfer the relinquished property. If more than one relinquished property is transferred on different dates, Treasury Regulation §1.1031(k)-1 states that the identification period and exchange period are determined by reference to the earliest transfer date.
The second deadline is the exchange period. The replacement property must be received and the exchange completed no later than the earlier of the 180th day after the relinquished property transfer or the due date, including extensions, of the income tax return for the year in which the relinquished property was transferred. IRS Notice 2005-3 describes the same two-part deadline framework for deferred like-kind exchanges (IRS Notice 2005-3).
The deadlines are separate. A valid 45-day identification does not give extra time to close, and a property purchased inside 180 days does not fix a failed identification. The IRS fact sheet also cautions that the time limits cannot be extended for hardship except in the case of presidentially declared disasters.
What a written identification must include
The identification must be in writing, signed by the taxpayer, and delivered before the end of the identification period to a person involved in the exchange. IRS guidance gives examples such as the seller of the replacement property or the qualified intermediary, while also warning that notice to the taxpayer’s attorney, real estate agent, accountant, or similar agent is not sufficient.
The property also must be described clearly. For real estate, the IRS instructions say the written identification should use a legal description, street address, or distinguishable name, such as the name of an apartment building. A vague label like “a duplex in Phoenix” is not the same as a clear and recognizable identification.
A written exchange agreement signed by all parties before the end of the identification period can also satisfy the identification requirement if it designates the replacement property. Property that the taxpayer actually receives before the end of the 45-day identification period is treated as identified within that period.
The three-property rule
The three-property rule is the simplest identification limit: you may identify up to three replacement properties without regard to their fair market values. This rule is often useful when a taxpayer has a primary target and one or two backups.
The key word is “three.” If you identify four or more properties, you are outside the three-property rule and need to fit another rule. The value of the properties does not matter for this specific limit; a list of three high-value properties can still fit the three-property rule, assuming the written-identification formalities are met.
The 200% rule
The 200% rule allows you to identify any number of replacement properties, but their aggregate fair market value cannot exceed 200% of the aggregate fair market value of all relinquished properties as of the transfer date. This rule is commonly relevant when a taxpayer wants flexibility across several smaller replacement properties.
Hypothetical example: assume the relinquished property has a fair market value of $900,000. Under the 200% rule, the aggregate value limit is $1,800,000. If the taxpayer identifies four replacement properties worth $350,000, $400,000, $450,000, and $300,000, the identified total is $1,500,000. That list is under the $1,800,000 cap, so it fits the 200% rule.
The rule is value-sensitive. If the aggregate identified value exceeds the 200% limit, the taxpayer needs another basis for the identification list, such as the 95% exception.
The 95% exception
The 95% exception is the narrow fallback under Treasury Regulation §1.1031(k)-1(c)(4). In practical terms, it is not a casual way to over-identify. It works only if, before the exchange period ends, the taxpayer receives identified replacement property with fair market value of at least 95% of the aggregate fair market value of all identified replacement properties.
Hypothetical example: assume a taxpayer identifies replacement properties with a combined value of $2,400,000. Under a 95% test, the taxpayer would need to receive at least $2,280,000 of the identified value. If the taxpayer receives only $2,100,000, the shortfall is $180,000, and the identification plan does not meet that 95% threshold.
Because the 95% exception depends on what is actually acquired, it can be risky when financing, inspections, title issues, or seller performance are uncertain. A taxpayer who wants optionality should usually model the list under the three-property rule or the 200% rule before relying on the 95% exception.
Substituting property before day 45
A replacement-property list can be changed only while there is still time to make a valid identification. Treasury Regulation §1.1031(k)-1(c)(6) permits revocation before the end of the identification period through a signed written revocation delivered to the person who received the identification. That means a failed purchase contract on day 30 can still be replaced with a new, properly delivered identification. A failed purchase contract after the identification period ends is a much harder problem because the taxpayer generally cannot add a new property after the deadline.
For clean records, a substitution should identify the old list being revoked, clearly describe the new replacement property, be signed by the taxpayer, and be delivered to a permitted recipient before the identification period closes. The article is educational only; transaction documents should be coordinated with the exchange facilitator and tax advisor handling the exchange.
Common identification mistakes
The most common mistake is missing the 45-day written-identification deadline. If the replacement property is not properly identified on time and was not already received during the identification period, it may not count as like-kind replacement property for the deferred exchange.
Another common mistake is delivering the identification only to the taxpayer’s own agent. The IRS fact sheet says notice to an attorney, real estate agent, accountant, or similar person acting as the taxpayer’s agent is not sufficient. Delivery should go to a permitted exchange party, such as the person obligated to transfer the replacement property or another person involved in the exchange who is not disqualified.
A third mistake is using an unclear description. The Form 8824 instructions call for a clear and recognizable description; real property should be described by legal description, street address, or distinguishable name.
A fourth mistake is over-identifying. Four or more properties do not fit the three-property rule. If the list also exceeds the 200% value cap and the taxpayer does not receive at least 95% of the identified value, the identification can fail.
A fifth mistake is taking control of sale proceeds before the exchange is complete. The IRS fact sheet warns that taking control of cash or other proceeds before completion may disqualify the entire transaction and make all gain immediately taxable. A qualified intermediary is one commonly used safe harbor, and IRS guidance also refers to qualified escrow and qualified trust safe harbors; the right structure depends on the exchange documents and facts (IRS Revenue Procedure 2003-39).
Finally, remember reporting. Form 8824 asks for the date of written identification, property descriptions, transfer dates, values, cash, liabilities, basis, and realized gain. The identification file should be built with the eventual tax reporting in mind, not reconstructed months later.
Frequently asked questions
In a deferred exchange, replacement property must be identified in a signed writing before the end of the 45-day identification period, clearly described, and delivered to a permitted person involved in the exchange. The taxpayer must later receive identified replacement property before the exchange period ends.
Yes, but only if the list fits another identification limit. Under the 200% rule, you may identify any number of properties if their aggregate fair market value does not exceed 200% of the aggregate fair market value of the relinquished properties. The 95% exception is a fallback when the taxpayer receives at least 95% of the identified value.
A substitution should be made in a new signed writing and delivered or sent before the end of the 45-day identification period. After the identification period closes, adding a new property generally does not fix a failed or abandoned purchase.
Not always. IRS guidance says the signed written identification may be delivered to a person involved in the exchange, such as the seller of the replacement property or the qualified intermediary. Notice only to your attorney, real estate agent, accountant, or similar agent is not sufficient.
If replacement property is not properly identified before the deadline and was not already received during the identification period, it may be treated as not like-kind property for the deferred exchange. IRS guidance warns that failing to follow the like-kind exchange rules can result in taxes, penalties, and interest.
Educational disclaimer
This article is general tax education for real estate investors and is not tax, legal, accounting, or investment advice. Section 1031 outcomes depend on the exchange agreement, property facts, timing, state law, related-party issues, financing, and reporting. Work with a qualified tax advisor and exchange professional before signing exchange documents or closing either side of a transaction.
Primary sources
- IRS Fact Sheet FS-2008-18
- Treasury Regulation §1.1031(k)-1 via GovInfo
- IRS Form 8824 Instructions
- IRS Notice 2005-3
- IRS Revenue Procedure 2003-39