Collection Actions: 31 U.S.C. § 3717. Interest and penalty on claims
(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.