5 CFR 304.104 - Determining rate of pay.
(a) The rate of basic pay for experts and consultants is set by administrative action. The head of an agency, or his or her designee, must determine the appropriate rate of basic pay on an hourly or daily basis, subject to the limitations described in section 304.105.
(1) The level and difficulty of the work to be performed;
(2) The qualifications of the expert or consultant;
(3) The pay rates of comparable individuals performing similar work in Federal or non-Federal sectors; and
(4) The availability of qualified candidates.