Vanderbilt Law Review

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In Northwestern States Portland Cement Co. v. Minnesota,' the Supreme Court recently granted states the broad power to tax earnings of out-of-state corporations from business done within each state. Justice Clark, speaking for the majority, laid down the doctrine that "the entire net income of a corporation, generated by interstate as well as intrastate activities, may be fairly apportioned among the States for tax purposes by formulas utilizing in-state aspects of inter-state affairs." The purpose of this note is to analyze the doctrine, its background and possible economic consequences.