Let’s leave to actuaries what mūtātīs mūtandīs might mean in mathematics.
And let’s leave to teachers what mutatis mutandis might mean in logic.
Black’s Law Dictionary (11th ed. 2019) describes the phrase’s meaning as “with the necessary changes[.]”
Lawyers have used the phrase to avoid some duplicative renderings of terms, promises, conditions, representations, and warranties in some kinds of contracts, obligations, or undertakings. A leading treatise about how to write contracts gives this example: “Each Guarantor hereby makes to the Lender, as if they were in this agreement, mutatis mutandis, each of the statements of fact made by the Borrower in the Loan Agreement.” Kenneth A. Adams, A Manual of Style for Contract Drafting ¶ 13.576 [page 449] (5th ed. 2023).
But whatever the old phrase might mean in other contexts, one should not presume that specifying a date that has some meaning regarding a plan’s discontinuance or termination by itself changes a day set for a retirement plan’s allocation condition.
Bill Presson leads us to the solution: Read, thoroughly and carefully, what the documents governing the plan say.
If what the documents provide is ambiguous, the plan’s administrator might use its discretion to interpret what the plan provides or omits.
Often better, the administrator might suggest that the plan sponsor amend the documents.
Or does The Shadow know?