(a)(1) The head of an executive, judicial, or legislative agency shall charge a minimum annual rate of interest on an outstanding debt on a United States Government claim owed by a person that is equal to the average investment rate for the Treasury tax and loan accounts for the 12-month period ending on September 30 of each year, rounded to the nearest whole percentage point. The Secretary of the Treasury shall publish the rate before November 1 of that year. The rate is effective on the first day of the next calendar quarter.

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(2) The Secretary may change the rate of interest for a calendar quarter if the average investment rate for the 12-month period ending at the close of the prior calendar quarter, rounded to the nearest whole percentage point, is more or less than the existing published rate by 2 percentage points.

(b) Interest under subsection (a) of this section accrues from the date—

(1) on which notice is mailed after October 25, 1982, if notice was first mailed before October 25, 1982; or

(2) notice of the amount due is first mailed to the debtor at the most current address of the debtor available to the head of the executive or ¹ legislative agency, if notice is first mailed after October 24, 1982.

(c) The rate of interest charged under subsection (a) of this section—

(1) is the rate in effect on the date from which interest begins to accrue under subsection (b) of this section; and

(2) remains fixed at that rate for the duration of the indebtedness.

(d) Interest under subsection (a) of this section may not be charged if the amount due on the claim is paid within 30 days after the date from which interest accrues under subsection (b) of this section. The head of an executive, judicial, or legislative agency may extend the 30-day period.

(e) The head of an executive, judicial, or legislative agency shall assess on a claim owed by a person—

(1) a charge to cover the cost of processing and handling a delinquent claim; and

(2) a penalty charge of not more than 6 percent a year for failure to pay a part of a debt more than 90 days past due.

(f) Interest under subsection (a) of this section does not accrue on a charge assessed under subsection (e) of this section.

(g) This section does not apply—

(1) if a statute, regulation required by statute, loan agreement, or contract prohibits charging interest or assessing charges or explicitly fixes the interest or charges; and

(2) to a claim under a contract executed before October 25, 1982, that is in effect on October 25, 1982.

(h) In conformity with standards prescribed jointly by the Attorney General, the Secretary of the Treasury, and the Comptroller General, the head of an executive, judicial, or legislative agency may prescribe regulations identifying circumstances appropriate to waiving collection of interest and charges under subsections (a) and (e) of this section. A waiver under the regulations is deemed to be compliance with this section.

(i)(1) The head of an executive, judicial, or legislative agency may increase an administrative claim by the cost of living adjustment in lieu of charging interest and penalties under this section. Adjustments under this subsection will be computed annually.

(2) For the purpose of this subsection—

(A) the term “cost of living adjustment” means the percentage by which the Consumer Price Index for the month of June of the calendar year preceding the adjustment exceeds the Consumer Price Index for the month of June of the calendar year in which the claim was determined or last adjusted; and

(B) the term “administrative claim” includes all debt that is not based on an extension of Government credit through direct loans, loan guarantees, or insurance, including fines, penalties, and overpayments.