MODIFICATIONS TO TAXABLE YEARS TO WHICH UNUSED CREDITS MAY BE CARRIED.

SEC. 1083. MODIFICATIONS TO TAXABLE YEARS TO WHICH UNUSED CREDITS MAY BE CARRIED. (a) In General.—Section 39(a) (relating to unused credits) is amended— (1) in paragraph (1), by striking “3” each place it appears and inserting “1” and by striking “15” each place it appears and inserting “20”; and (2) in paragraph (2), by striking “18” each place it appears and inserting “22” and by striking “17” each place it appears and inserting “21”. (b) Effective Date.—The amendments made by this section shall apply to credits arising in taxable years beginning after December 31, 1997.