(a) In addition to the amount of recovery calculated under § 124.705, the United States shall be entitled to recover interest on such amount in accordance with this section at the rate determined by the Secretary based on the average of the bond equivalent of the weekly ninety-day U.S. Treasury bill auction rate for the quarter previous to the quarter in which interest begins to accrue under this section.

(1) Change of status before July 18, 1984. For facilities that were sold or transferred or which ceased to be public or other nonprofit facilities before July 18, 1984, interest will be charged beginning August 17, 1984, or 180 days after the date of such sale, transfer or other, whichever is later, and ending on the date the amount the United States is entitled to recover is collected.

(2) Change of status after July 17, 1984. For facilities that are sold or transferred or which cease to be public or other nonprofit facilities after July 17, 1984, interest will be charged beginning 180 days after receipt by the Department of the notice required under § 124.704; Provided, That if such notice is not provided as prescribed, interest will be charged beginning on the date of the sale, transfer, or change of use, and ending on the date the amount which the United States is entitled to recover is collected.

(b) The Secretary may waive interest charges that result from delays caused solely by the Department.