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Effen, can you point me to some of those old threads? Thanks.
Interesting, I can't seem to find exactly what I was looking for, but here a two that might help.
old postold post 1 - I don't really like the PBGC's response, but at least they are saying you must use rounded ages - according to the poster.
If you search "annuity starting date" you will find a lot of threads that dance around the issue. To me, I just don't see how you can argue that basing the lump sum on some date/age in the past doesn't violate 411(d)(6), when you are clearly paying someone less than the value of their accrued benefit.