Section 551.501 - Overtime pay(a) An agency shall compensate an employee who is not exempt under subpart B of this part for all hours of work in excess of 8 in a day or 40 in a workweek at a rate equal to one and one-half times the employee's hourly regular rate of pay, except that an employee shall not receive overtime compensation under this part-(1) On the basis of periods of duty in excess of 8 hours in a day when the employee receives compensation for that duty under 5 U.S.C. 5545(c)(1) or (2) or 5545b ;(2) On the basis of hours of work in excess of 8 hours in a day that are not overtime hours of work under § 410.402 of this chapter, part 532 of this chapter and 5 U.S.C. 5544 , or part 550 of this chapter;(3) On the basis of hours of work in excess of 8 hours in a day for an employee covered by 5 U.S.C. 5544 for any hours in a standby or on-call status or while sleeping or eating;(4) On the basis of hours of work in excess of 8 hours in a day for an individual who is not an employee, as defined in 5 U.S.C. 5541(2) , for purposes of 5 U.S.C. 5542 , 5543 , and 5544 ;(5) On the basis of hours of work in excess of 40 hours in a workweek for an employee engaged in fire protection or law enforcement activities when the employee is receiving compensation under 5 U.S.C. 5545(c)(1) or (2) or 5545b , or is not an employee (as defined in 5 U.S.C. 5541(2) ) for the purposes of 5 U.S.C. 5542 , 5543 , and 5544 ;(6) For hours of work that are not "overtime hours," as defined in 5 U.S.C. 6121 , for employees under flexible or compressed work schedules;(7) For hours of work compensated by compensatory time off under § 551.531 of this part; and(8) For fractional hours of work, except as provided in § 551.521 of this part.(b) An employee's "workweek" is a fixed and recurring period of 168 hours-seven consecutive 24-hour periods. It need not coincide with the calendar week but may begin on any day and at any hour of a day. For employees subject to part 610 of this chapter, the workweek shall be the same as the administrative workweek defined in § 610.102 of this chapter.(c) In this subpart, "irregular or occasional overtime work" is overtime work that is not scheduled in advance of the employee's workweek.(d) The maximum earnings limitations described in §§ 550.105 , 550.106 , and 550.107 of this chapter do not apply to overtime pay due the employee under this subpart.45 FR 85665, Dec. 30, 1980, as amended at 56 FR 11060, Mar. 15, 1991; 56 FR 20343, May 3, 1991; 57 FR 59279, Dec. 15, 1992; 63 FR 64594, Nov. 23, 1998; 64 FR 69180, Dec. 10, 1999