portfolio interest
(2) Portfolio interest For purposes of this subsection, the term “portfolio interest” means any interest (including original issue discount) which— (A) would be subject to tax under subsection (a) but for this subsection, and (B) is paid on an obligation— (i) which is in registered form, and (ii) with respect to which— (I) the United States person who would otherwise be required to deduct and withhold tax from such interest under section 1441(a) receives a statement (which meets the requirements of paragraph (5)) that the beneficial owner of the obligation is not a United States person, or (II) the Secretary has determined that such a statement is not required in order to carry out the purposes of this subsection.