5 USC 5755 - Supervisory differentials

(1) The Office of Personnel Management may authorize the head of an agency to pay a differential to an employee under the General Schedule who has supervisory responsibility for 1 or more employees not under the General Schedule, if 1 or more of the subordinate employees would, in the absence of such a differential, be paid more than the supervisory employee.
(2) For the purposes of comparing the pay of a supervisory employee under the General Schedule with the pay of a subordinate employee not under the General Schedule, comparability payments under section 5304, differentials, and allowances that are not a part of basic pay may be taken into consideration, as provided by regulations of the Office.

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(1) A supervisory differential, which shall be stated as a percentage of the supervisory employees rate of basic pay (excluding any comparability payments under section 5304) or as a dollar amount, may not cause the supervisory employees pay to exceed the pay of the highest paid subordinate employee by more than 3 percent.
(2) A supervisory differential may not be considered to be part of the basic pay of an employee, and the reduction or elimination of a supervisory differential may not be appealed. The preceding sentence shall not be construed to extinguish or lessen any right or remedy under subchapter II of chapter 12 or under any of the laws referred to in section 2302 (d).
(3) A supervisory differential shall be paid in the same manner and at the same time as the employees basic pay is paid.
(c) For the purpose of this section
(1) the terms agency and employee have the meanings given them by section 5102; and
(2) any reference to an employee under the General Schedule shall be considered to be a reference to any employee holding a position to which subchapter III of chapter 53 applies.
(d) The Office shall prescribe such regulations as it considers necessary for the administration of this section.