29 CFR § 4050.305 - Filing with PBGC.
(a) What to file. The plan administrator of a subpart C plan must file with PBGC the information specified in the missing participants forms and instructions, and if the plan is a transferring plan, payment of -
(2) If the benefit transfer amount is paid more than 90 days after the benefit determination date, interest on the benefit transfer amount computed at the missing participants interest rate for the period beginning on the 90th day after the benefit determination date and ending on the date the benefit transfer amount is paid to PBGC; and
(3) Any fee provided for in the missing participants forms and instructions.
(c) Place, method and date of filing; time periods.
(1) For rules about where to file, see § 4000.4 of this chapter.
(d) Supplemental information. Within 30 days after a written request by PBGC (or such other time as may be specified in the request), the plan administrator of a subpart C plan required to file under paragraph (a) of this section must file with PBGC supplemental information for any proper purpose under the missing participants program.
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