If the taxpayer has purchased qualified replacement property at the time of the election, the taxpayer must attach as part of the statement of election a statement of purchase describing the qualified replacement property, the date of the purchase, and the cost of the property, and declaring such property to be the qualified replacement property with respect to the sale of qualified securities. Such statement of purchase must be notarized by the later of thirty days after the purchase or March 6, 1986. In addition, the statement of election must be accompanied by the verified written statement of consent required under Q&A-2 of this section with respect to the qualified securities sold.
In those situations when a taxpayer is providing a written statement of an intention not to purchase or of a failure to purchase qualified replacement property, the statement shall be accompanied, where appropriate, by an amended return for the taxable year in which the gain from the sale of the qualified securities was realized, in order to reflect the inclusion in gross income for that year of gain required to be recognized in connection with such sale.
26 C.F.R. §1.1042-1T