In any case, 4.2 million $ payout per year on savings of $184 million is a 2.3% withdrawal rate. Current best estimate of the maximum save withdrawal rate is <2%:

The present value calculations done in the standard way are misleading and over-optimistic. They do not account for the small probability of unlikely downturns, like that 1929-1945 or 2009-present. So I'd ignore them, and save enough to supply a 2% safe withdrawal rate.

Which means: for the closed-plan fund, leave it alone. Only uncautious folks would do otherwise.

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