§ 901.9 Interest, penalties, and administrative costs.

(a) Except as provided in paragraphs (g), (h), and (i) of this section, agencies shall charge interest, penalties, and administrative costs on debts owed to the United States pursuant to 31 U.S.C. 3717. An agency shall mail or hand-deliver a written notice to the debtor, at the debtor's most recent address available to the agency, explaining the agency's requirements concerning these charges except where these requirements are included in a contractual or repayment agreement. These charges shall continue to accrue until the debt is paid in full or otherwise resolved through compromise, termination, or waiver of the charges.

(b) Agencies shall charge interest on debts owed the United States as follows:

(1) Interest shall accrue from the date of delinquency, or as otherwise provided by law.

(2) Unless otherwise established in a contract, repayment agreement, or by statute, the rate of interest charged shall be the rate established annually by the Secretary in accordance with 31 U.S.C. 3717. Pursuant to 31 U.S.C. 3717, an agency may charge a higher rate of interest if it reasonably determines that a higher rate is necessary to protect the rights of the United States. The agency should document the reason(s) for its determination that the higher rate is necessary.