This article attempts to provide the first comprehensive rationale for defending the current corporate income tax. It argues that the usual reasons given for the tax (primarily as an indirect way of taxing shareholders, or alternatively as a form of benefit tax) are inadequate. It then explains what the original rationale to adopt this tax was in 1909, namely to regulate managerial power, and that this rationale stems from the real view of the corporation, which was the dominant view throughout the many transformations underwent by the corporate form from Roman times to the present. Turning to normative argument, the article then argues that the regulatory rationale given for taxing corporations in 1909 is still valid, since similar social ...