Section 550.171 - Authorization of pay for Sunday work(a) An employee is entitled to pay at his or her rate of basic pay plus premium pay at a rate equal to 25 percent of his or her rate of basic pay for each hour of Sunday work (as defined in § 550.103 ).(b) An employee is not entitled to Sunday premium pay while engaged in training, except as provided in § 410.402 of this chapter.60 FR 33098, June 27, 1995, as amended at 60 FR 67287, Dec. 29, 1995; 64 FR 69175, Dec. 10, 1999; 72 FR 12036 , Mar. 15, 2007; 76 FR 52539 , Aug. 23, 2011