Code of Federal Regulations Title 5. Administrative Personnel § 5.551.501 Overtime pay

(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.