[Code of Federal Regulations] [Title 26, Volume 12] [Revised as of April 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 26CFR1.1402(c)-4] [Page 33] TITLE 26--INTERNAL REVENUE CHAPTER I--INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED) PART 1_INCOME TAXES--Table of Contents Sec. 1.1402(c)-4 Individuals under Railroad Retirement System. The performance of service by an individual as an employee or employee representative as defined in section 3231(b) and (c), respectively (see Sec. Sec. 31.3231(b)-1 and 31.3231(c)-1 of Part 31 of this chapter (Employment Tax Regulations)), that is, an individual covered under the railroad retirement system, does not constitute a trade or business.