18 C.F.R. § 381.109

Fees established under this part may be refunded only if the related filing is withdrawn within fifteen (15) days of the date of filing or, if applicable, before the filing is noticed in the Federal Register or, if the fee is inappropriately paid for a filing for which no fee is established. Fees paid in excess of the fees established under this part may be refunded to the extent of the amount paid in excess. To obtain a refund, the applicant must file a motion requesting refund with the Commission.