A taxpayer has 45 days after the date that the relinquished property is transferred to properly identify potential replacement properties. The exchange must be completed by the date that is 180 days after the transfer of the relinquished property, or the due date of the taxpayer’s federal tax return for the year in which the relinquished property was transferred, whichever is earlier. Thus, for a calendar year taxpayer, the exchange period may be cut short for any exchange that begins after October 17^th. However, the taxpayer can get the full 180 days, by obtaining an extension of the due date for filing the tax return. 

Unfortunately, there are no extensions available. If the taxpayer does not meet the time limits, the exchange will fail and the taxpayer will have to pay any taxes arising from the sale of the relinquished property, unless the IRS has expressly granted extensions in specified disaster area(s).