(a) Most recent valuation. All calculations required by this part must be based on the most recent actuarial valuation as of the date of filing the notice, updated to show any material changes.
(b) Assumptions. All calculations required by this part must be based on methods and assumptions that are reasonable in the aggregate, based on generally accepted actuarial principles.
(c) Updated calculations. If the actual effective date of the merger or transfer is more than one year after the date the notice is filed with the PBGC, PBGC may require the plans involved to provide updated calculations and representations based on the actual effective date of the transaction.