29 CFR 4901.33 - Payment of fees.
(a) Medium of payment. Payment of the applicable fees as provided in this subsection shall be made in cash, by U.S. postal money order, or by check payable to the PBGC. Postage stamps will not be accepted in lieu of cash, checks, or money orders as payment for fees specified in the schedule. Cash should not be sent by mail.
(b) Advance payment or assurance of payment. Payment or assurance of payment before work is begun or continued on a request may be required under the following rules.
(1) Where the PBGC estimates or determines that charges allowable under the rules in this subpart are likely to exceed $250, the PBGC may require advance payment of the entire fee or assurance of payment, as follows:
(i) Where the requester has a history of prompt payment of fees under this part, the PBGC will notify the requester of the likely cost and obtain satisfactory assurance of full payment; or
(ii) Where the requester has no history of payment for requests made pursuant to FOIA and this part, the PBGC may require the requester to make an advance payment of an amount up to the full estimated charges.
(2) Where the requester has previously failed to pay a fee charged in a timely fashion (i.e., within 30 days of the date of the billing), the PBGC may require the requester to pay the full amount owed plus any applicable interest as provided in paragraph (c) of this section (or demonstrate that he has, in fact, paid the fee) and to make an advance payment of the full amount of the estimated fee.
(c) Late payment interest charges. The PBGC may assess late payment interest charges on any amounts unpaid by the 31st day after the date a bill is sent to a requester. Interest will be assessed at the rate prescribed in 31 U.S.C. 3717 and will accrue from the date the bill is sent.