When credits earned in more than one (1) taxable year are available, the oldest credits shall be applied first.
In the event of either such a transfer, the transferee may claim the credit on the transferee's income tax return originally filed during the calendar year in which the transfer takes place and, in the case of carryover of the credit, on the transferee's returns for the number of years of carryover available to the transferor at the time of the transfer unless earlier exhausted.
Idaho Code § 63-3029I