MDM, thanks for the helpful info and links. So it sounds like TSP will keep my Roth 401k rollover separate in that it is post tax and should not incur any additional future tax.
Perhaps I should have clarified. If we make a nondeductible IRA contribution of $5500, then it could immediately be rolled over into a Roth IRA.
However, for the funds that are currently sitting in the 403b, we will keep them at TIAA-CREF and after we stop working (and income drops), then do we roll them over to and IRA, pay deferred taxes and then roll them into a Roth?
Thanks