That’s called the ‘commutative property of multiplication’.
(1-t)(1+r)(1+r)(1+r)(1+r)=(1+r)(1+r)(1+r)(1+r)(1-t)
I think it was you that told me that before, but I'm still amazed.
So, that fact leads me to believe there are three good reasons to
do Roth conversions. Add to my list if you see more.
1. You think tax rates will increase for your bracket at RMD time. (at least for me at 63)
2. A Roth is easier for your heirs to inherit.
3. The extra income from a traditional IRA will push you into higher tax Brackets.
EDIT, found a fourth.
4. If one spouse dies, that could push the remaining spouse to a higher bracket.
My conundrum is, If I put money into mine and my wife's SEP/IRA we stay in the 15% tax bracket.
If I don't that money will jump to the 25% bracket, so I will probably be in a lower bracket at retirement.
That's for 2017, 2018 may be a different ballgame, and that's when I will do some November bookkeeping,
to see where I stand with, the 20% pass thru, no kid deductions, the college tuition and the standard deduction.