Yeah - I guess I read it that the RMD alone was pushing the 24% bracket, but adjusting for pensions and SS to be a part of the income to get to the top of the 24% bracket would decrease the RMD, and therefore the IRA balance lower.
That said, even with an RMD of, say $100k, the IRA balance would be north of $2.5MM. 1/10 of that would still easily put a single filer into at least the 32% bracket, and depending on other income, possibly into the 35% bracket. So it still could be that it will still result in a lower tax bill on the overall IRA if @RHinCT were to take some distributions in the 32% bracket.
It phases out. For single filers, the phase out range starts at $75k and tops out at $175k. For MFJ filers, the phase out range is $150k to $250k.
AJ