For purposes of paragraph (1), any credit allowed under section
33 (relating to withholding of tax on nonresident aliens and on foreign corporations) for any taxable year shall be treated as a credit allowable under subpart C of part IV of subchapter A of chapter 1 only if an election under subsection (g) or (h) of section
6013 is in effect for such taxable year. The preceding sentence shall not apply to any credit so allowed by reason of section
1446.