17 CFR 143.2: Notice of claim.

(a) The Commission will send a written notice to any person who owes payment to the United States under this part, stating the basis for the claim, the interest, penalties, and administrative costs that may be imposed for non-payment, and the date full payment is due.

(b) If the claim is disputed, the debtor shall respond to the notice in writing and state the reasons for non-payment. If the claim is not disputed but full payment is not made by the date indicated in the notice, the debtor shall state the reasons for the failure to make full payment.

(c) If no response or an unsatisfactory response is received by the date indicated in the notice, the Commission may take further action as appropriate under the Commodity Exchange Act or regulations thereunder, or under 31 CFR parts 900-905 or the Federal Claims Collection Act as amended, 31 U.S.C. 3701-3720E.