45 CFR §33.15
- (a)The Secretary shall promptly refund any amounts paid or deducted under this part when:
- (1)A debt is waived or otherwise found not owing to the United States; or
- (2)The employee's paying agency is directed by administrative or judicial order to refund amount deducted from the employee's current pay.
- (b)Unless required or permitted by law or contract, refunds shall not bear interest.