In the case of any bond (as defined in section 171(d)), the amount of bond premium, and the amortizable bond premium for the taxable year, shall be determined under section 171(b) as if the election set forth in section 171(c) had been made.
If any return of a corporation made under this part is for a period of less than the entire calendar year (referred to in this subsection as “short period”), then section 443 shall not apply in respect to such period, but life insurance company taxable income shall be determined, under regulations prescribed by the Secretary, on an annual basis by a ratable daily projection of the appropriate figures for the short period.