of Senate elections. . (b) Conforming amendment The table of chapters of the Internal Revenue Code of 1986 is amended by inserting after the item relating to chapter 36 the following: Chapter 37—Tax on payments pursuant to certain government contracts . (c) Effective date The amendments made by this section shall apply to contracts entered into after the date of the enactment of this Act. VI Miscellaneous provisions 601. Severability If any provision of this Act or amendment made by this Act, or the application of a provision or amendment to any person or circumstance, is held to be unconstitutional, the remainder of this Act and amendments made by this Act, and the application of the provisions and amendment to any person or circumstance, shall not be affected by the holding. 602. Effective date Except as otherwise provided for in this Act, this Act and the amendments made by this Act shall take effect on January 1, 2019.