5 CFR §530.201

This subpart establishes regulations for limiting an employee's aggregate annual compensation. An employee's aggregate compensation received in any given calendar year may not exceed the rate of pay for level I of the Executive Schedule or the rate payable to the Vice President at the end of the calendar year, whichever is applicable to the employee based on the certification status under 5 CFR part 430, subpart D, of the performance appraisal system covering that employee. These regulations must be applied in conjunction with 5 U.S.C. 5307.