In general. The regulations in this part relate to the employment taxes imposed by subtitle C (chapters 21 to 25, inclusive) of the Internal Revenue Code of 1954, as amended. References in the regulations to the “Internal Revenue Code” or the “Code” are references to the Internal Revenue Code of 1954, as amended, unless otherwise indicated. References to the Federal Insurance Contributions Act, the Railroad Retirement Tax Act, and the Federal Unemployment Tax Act are references to chapters 21, 22, and 23, respectively, of the Code. References to sections of law are references to sections of the Internal Revenue Code unless otherwise indicated. The regulations in this part also provide rules relating to the deposit of other taxes by electronic funds transfer.

Division of regulations. The regulations in this part are divided into 7 subparts. Subpart A contains provisions relating to general definitions and use of terms, the division and scope of the regulations in this part, and the extent to which the regulations in this part supersede prior regulations relating to employment taxes. Subpart B relates to the taxes under the Federal Insurance Contributions Act. Subpart C relates to the taxes under the Railroad Retirement Tax Act. Subpart D relates to the tax under the Federal Unemployment Tax Act. Subpart E relates to the collection of income tax at source on wages under chapter 24 of the Code. Subpart F relates to the provisions of chapter 25 of the Code which are applicable in respect of the taxes imposed by chapters 21 to 24, inclusive, of the Code. Subpart G relates to selected provisions of subtitle F of the Code, relating to procedure and administration, which have special application in respect of the taxes imposed by subtitle C of the Code. Inasmuch as these regulations constitute Part 31 of title 26 of the Code of Federal Regulations, each section of the regulations is preceded by a section symbol and 31 followed by a decimal point (§ 31.). Sections of law or references thereto are preceded by “Sec.” or the word “section”.