30 CFR § 870.21 - Late payments.
(a) Fee payments postmarked later than 30 days after the calendar quarter for which the fee was owed are subject to interest. Late reclamation fee payments are subject to interest at the rate established by the U.S. Department of the Treasury for late charges on payments to the Federal Government. The Treasury current value of funds rate is published annually in the Federal Register and on Treasury's Web site.
(b) We will charge interest on unpaid reclamation fees from the 31st day following the end of the calendar quarter for which the fee payment is owed to the date of payment. If you are delinquent, we will bill you monthly and initiate whatever action is necessary to collect full payment of all fees and interest.
(c) When a reclamation fee debt is more than 91 days overdue, a 6 percent annual penalty on the amount owed for fees will begin and will run until the date of payment. This penalty is in addition to the interest described in paragraph (a) of this section.
(d) For all delinquent fees, interest, and penalties, you must pay a processing and handling charge that we will set based upon the following components:
(1) For debts referred to a collection agency, the amount charged to us by the collection agency;
(2) For debts we processed and handled, a standard amount we set annually based upon similar charges by collection agencies for debt collection;
(3) For debts referred to the Office of the Solicitor within the U.S. Department of the Interior, but paid before litigation, the estimated average cost to prepare the case for litigation as of the time of payment;
(4) For debts referred to the Office of the Solicitor within the U.S. Department of the Interior, and litigated, the estimated cost to prepare and litigate a debt case as of the time of payment; and
(5) If not otherwise provided for, all other administrative expenses associated with collection, including, but not limited to, billing, recording payments, and follow-up actions.
(e) We will not charge prejudgment interest on any processing and handling charges.