The annual tax tables for Federal, State, and Puerto Rico needed for calculating RIT allowance are published annually as an FTR Bulletin. These Bulletins are located at www.gsa.gov/ftrbulletin. A notice announcing each new Bulletin will be published in the Federal Register.
Code of Federal Regulations
[FTR Amdt. 2008-04, 73 FR 35953, June 25, 2008]