establishment of the Internal Revenue Bureau (later renamed Internal Revenue Service) and a progressive tax scale. References External links Act to provide increased Revenue from Imports, to pay Interest on the Public Debt, and for other Purposes. 37th Congress, 1st Session, Ch. 45, 12 Stat. 292 [Revenue Act of 1861] 37th United States Congress United States federal taxation legislation 1861 in American law 1861 in the United States