Section 1620.21 - Contributions(a) An individual covered under this subpart can make contributions to the TSP from basic pay in the amount described at 5 CFR 1600.22(a)(1) . Unless stated otherwise in this subpart, he or she is covered by the same rules that apply to a CSRS participant in the TSP.(b) The following amounts are not basic pay and no TSP contributions can be made from them:(1) An annuity or salary received by a justice or judge of the United States (as defined in 28 U.S.C. 451 ) who is retired under 28 U.S.C. 371(a) or (b) , or 372(a) ;(2) Amounts received by a bankruptcy judge or a United States magistrate judge under a judges' annuity described at 28 U.S.C. 377 ;(3) An annuity or salary received by a judge of the United States Court of Federal Claims under 28 U.S.C. 178 ; and(4) Retired pay received by a judge of the United States Court of Veterans Appeals under 38 U.S.C. 7296 .64 FR 31057, June 9, 1999, as amended at 70 FR 32213, June 1, 2005