Rate of basic pay
Rate of basic pay means the rate of pay fixed by law or administrative action for the position to which an employee is or will be appointed before deductions and including any special rate under 5 CFR part 530, subpart C, or similar payment under other legal authority, and any locality-based comparability payment under 5 CFR part 531, subpart F, or similar payment under other legal authority, but excluding additional pay of any other kind. For example, a rate of basic pay does not include additional pay such as night shift differentials under 5 U.S.C. 5343 or environmental differentials under 5 U.S.C. 5343(c)(4).