22 C.F.R. § 34.24

(a) STATE will refund promptly to the appropriate individual amounts offset under this regulation when:

(1) A debt is waived or otherwise found not owing the United States (unless expressly prohibited by statute or regulation); or

(2) STATE is directed by an administrative or judicial order to make a refund.

(b) Refunds do not bear interest unless required or permitted by law or contract.