Supplementation of Salary
Executive branch employees may not be paid by someone other than the United States for doing their Government job. Thus, for example, a highly paid executive of a corporation upon entering Government service could not accept an offer from her former employer to make up the difference between her Government salary and the compensation she received from her former employer.
This prohibition does not apply to --
- certain special Government employees and employees serving without compensation
- funds contributed out of the treasury of any State, county, or municipality
- continued participation in a bona fide pension, retirement, group life, health or accident insurance, profit-sharing, stock bonus, or other employee welfare or benefit plan maintained by a former employer
- payments for travel, subsistence and other expenses made to an employee by a tax-exempt nonprofit organization incurred in connection with training, and
- moving expenses incurred in connection with participation in an executive exchange or fellowship program in an executive agency.
Reference: 18 U.S.C. § 209.