15 U.S.C. § 383 : Commerce And Trade — State Taxation Of Income From Interstate Commerce — Net Income Taxes — “Net Income Tax” Defined Date: 7 Mar 2017 TEXT PDF For purposes of this chapter, the term “net income tax” means any tax imposed on, or measured by, net income. (Pub. L. 86–272, title I, § 103, Sept. 14, 1959, 73 Stat. 556.)