29 CFR § 4043.61 - Advance reporting filing obligation.
(a) In general. Unless a waiver or extension applies with respect to the plan, each contributing sponsor of a plan is required to notify PBGC no later than 30 days before the effective date of a reportable event described in this subpart C if the contributing sponsor is subject to advance reporting for the reportable event. If there is a change in contributing sponsor, the responsibility for any failure to file or defective filing lies with the person who is the contributing sponsor of the plan on the notice date.
(3) The aggregate value of plan assets, determined in accordance with paragraph (c) of this section, is less than 90 percent of the aggregate premium funding target, determined in accordance with paragraph (c) of this section.
(c) Funding determinations. For purposes of paragraph (b) of this section, the aggregate unfunded vested benefits, aggregate value of plan assets, and aggregate premium funding target are determined by aggregating the unfunded vested benefits, values of plan assets, and premium funding targets (respectively), as determined in accordance with part 4006 of this chapter for purposes of the variable-rate premium for the plan year preceding the effective date of the event, of plans maintained (on the notice date) by the contributing sponsor and any members of the contributing sponsor's controlled group, disregarding plans with no unfunded vested benefits (as so determined).
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