29 CFR § 4047.4 - Payment of premiums.
(a) General. Upon restoration of a plan pursuant to ERISA section 4047, the obligation to pay PBGC premiums pursuant to ERISA section 4007 is reinstated as of the date on which the plan was trusteed under section 4042 of ERISA. Except as otherwise specifically provided in paragraphs (b) and (c) of this section, the amount of the outstanding premiums owed shall be computed and paid by the plan administrator in accordance with part 4006 of this chapter (Premium Rates) and the forms and instructions issued pursuant thereto, as in effect for the plan years for which premiums are owed.
(b) Notification of premiums owed. Whenever the PBGC issues or has issued a plan restoration order, it shall send a written notice to the plan administrator of the restored plan advising the plan administrator of the plan year(s) for which premiums are owed. PBGC will include with the notice the necessary premium payment forms and instructions. The notice shall prescribe the payment due dates for the outstanding premiums.
(c) Methods for determining variable rate portion of the premium. In general, the variable rate portion of the outstanding premiums shall be determined in accordance with the premium regulation and forms, as provided in paragraph (a) of this section, except that for any plan year following a plan year for which Form 5500, Schedule B was not filed because the plan was terminated, the alternative calculation method may not be used.