Please refer to IRS Reg. 1.411(a)-7(B), last sentence of subsection (1), immediately before the Examples in subsection (2).
This sentence seems to state, for purposes of vesting and other requirements in IRC 411, that the latest NRA is the first day of the plan year which contains the fifth anniversary of participation, even if that is not the "fifth anniversary of participation."
I don't know where this came from. It is not supported by a plain reading of IRC 411(a)(8), nor do I find anything in the Committee Reports from 1974 that would support this. The Gray Book does not address it.
Can anyone help?
In case you are wondering, this is the only other discussion thread I found that seems to be related.
http://benefitslink.com/boards/index.php?showtopic=13667