In the case of a disposition of an installment obligation by any person other than a life insurance company (as defined in section
816
(a)) to such an insurance company or to a partnership of which such an insurance company is a partner, no provision of this subtitle providing for the nonrecognition of gain shall apply with respect to any gain resulting under subsection (a). If a corporation which is a life insurance company for the taxable year was (for the preceding taxable year) a corporation which was not a life insurance company, such corporation shall, for purposes of this subsection and subsection (a), be treated as having transferred to a life insurance company, on the last day of the preceding taxable year, all installment obligations which it held on such last day. A partnership of which a life insurance company becomes a partner shall, for purposes of this subsection and subsection (a), be treated as having transferred to a life insurance company, on the last day of the preceding taxable year of such partnership, all installment obligations which it holds at the time such insurance company becomes a partner.