There is hereby imposed for each taxable year upon the investment company taxable income of every regulated investment company a tax computed as provided in section
11, as though the investment company taxable income were the taxable income referred to in section
11. In the case of a regulated investment company which is a personal holding company (as defined in section
542) or which fails to comply for the taxable year with regulations prescribed by the Secretary for the purpose of ascertaining the actual ownership of its stock, such tax shall be computed at the highest rate of tax specified in section
11
(b).