29 CFR § 4245.5 - Notice of insolvency benefit level.
(a) Requirement of notice. The plan sponsor of an insolvent plan must file with PBGC and issue to interested parties notices of insolvency benefit level containing the information described in § 4245.6 in each of the following circumstances—
(1) For the initial insolvency year, provide the notices of insolvency benefit level to PBGC and to interested parties.
(2) For any insolvency year following the initial insolvency year—
(i) If there is a change in the insolvency benefit level that affects plan payees generally, provide the notices of insolvency benefit level to PBGC and to plan payees (which, for purposes of this section, means participants and beneficiaries in pay status or reasonably expected to enter pay status during the insolvency year).
(ii) If there is a change in the insolvency benefit level that affects only one plan payee or a class of plan payees but not plan payees generally (treating commencement of a person's benefits for this purpose as a change in the insolvency benefit level for that person), provide the notices of insolvency benefit level to PBGC and to each affected plan payee.
(b) Combined notices. The plan sponsor may combine a notice of insolvency benefit level and a notice of insolvency under § 4245.3 for the same plan year.
(c) When to provide notice. The plan sponsor must provide the required notices under this section at the time described in § 4281.45(c) of this chapter.