In the determination of the dividends paid deduction for purposes of the personal holding company tax imposed by section 541, a dividend paid after the close of any taxable year and on or before the 15th day of the fourth month following the close of such taxable year shall, to the extent the taxpayer elects in its return for the taxable year, be considered as paid during such taxable year. The amount allowed as a dividend by reason of the application of this subsection with respect to any taxable year shall not exceed either—