If any fee required by this part is not paid in full on the date due, which shall be either 60 days after receipt of the invoice or the end of an approved extension of the time for payment, the person owing the fee shall pay a billing charge of $100, plus late charges in the amount of an additional one percent of all fees owed for every month or part of a month in which the fees remain unpaid beyond the due date. Billing and late charges shall be credited to the Hazardous Waste Fund and are independent of any penalties assessed under the act.
N.M. Admin. Code § 20.4.2.401