Use Form CT-1 to report taxes imposed by the Railroad Retirement Tax Act (RRTA). Current revision Form CT-1 PDF Instructions for Form CT-1 (Print version PDF) Recent developments None at this time. Other items you may find useful All Form CT-1 revisions U.S. Railroad Retirement Board Make a payment Other current products Related items About Form 945-A, Annual Record of Federal Tax Liability About Form CT-1-X, Adjusted Employer's Annual Railroad Retirement Tax Return or Claim for Refund About Form 941, Employer's Quarterly Federal Tax Return
