Identification requirement. You must identify the property to be received within 45 days after the date you transfer the property given up in the exchange. This period of time is called the identification period. Any property received during the identification period is considered to have been identified.
If you transfer more than one property (as part of the same transaction) and the properties are transferred on different dates, the identification period and the receipt period begin on the date of the earliest transfer.
Identifying replacement property. You must identify the replacement property in a signed written document and deliver it to the other person involved in the exchange. You must clearly describe the replacement property in the written document. For example, use the legal description or street address for real property and the make, model, and year for a car. In the same manner, you can cancel an identification of replacement property at any time before the end of the identification period.
Identifying alternative and multiple properties. You can identify more than one replacement property. Regardless of the number of properties you give up, the maximum number of replacement properties you can identify is the larger of the following.
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Three.
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Any number of properties whose total fair market value (FMV) at the end of the identification period is not more than double the total fair market value, on the date of transfer, of all properties you give up.
If, as of the end of the identification period, you have identified more properties than permitted under this rule, the only property that will be considered identified is:
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Any replacement property you received before the end of the identification period, and
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Any replacement property identified before the end of the identification period and received before the end of the receipt period, but only if the fair market value of the property is at least 95% of the total fair market value of all identified replacement properties. (Do not include any you canceled.) Fair market value is determined on the earlier of the date you received the property or the last day of the receipt period.
irs.gov/publications/p544/ch01




