Investment units
(h) Investment units(1) In general. Under section 1273(c)(2), an investment unit is treated as if the investment unit were a debt instrument. The issue price of the investment unit is determined under paragraph (a)(1), (b)(1), or (c)(1) of this section, if applicable. The issue price of the investment unit is then allocated between the debt instrument and the property right (or rights) that comprise the unit based on their relative fair market values. If paragraphs (a)(1), (b)(1), and (c)(1) of this section are not applicable, however, the issue price of the debt instrument that is part of the investment unit is determined under section 1273(b)(4) or 1274, whichever is applicable.