15 C.F.R. § 14.73 Collection of amounts due.
Title 15 - Commerce and Foreign Trade
(a) Any funds paid to a recipient in excess of the amount to which the recipient is finally determined to be entitled under the terms and conditions of the award constitute a debt to the Federal Government. If not paid within a reasonable period after the demand for payment, the Grants Officer may reduce the debt by: (1) Making an administrative offset against other requests for reimbursements; (2) Withholding advance payments otherwise due to the recipient; or (3) Taking other action permitted by statute. (b) Except as otherwise provided by law, the DoC shall charge interest on an overdue debt in accordance with 4 CFR Chapter II, “Federal Claims Collection Standards.”
Title 15: Commerce and Foreign Trade
PART 14—UNIFORM ADMINISTRATIVE REQUIREMENTS FOR GRANTS AND AGREEMENTS WITH INSTITUTIONS OF HIGHER EDUCATION, HOSPITALS, OTHER NON-PROFIT, AND COMMERCIAL ORGANIZATIONS
Subpart D—After-the-Award Requirements
§ 14.73 Collection of amounts due.

