Two years ago I converted my trad to a Roth, last year found the taxes were punative (60% marginal, thanks to AMT), and recharacterized 75% of it. A month later I converted it again.
This year I found the taxes were again punitive and recharacterized 70%. So now I have permanently converted about 50%.
Next month I will try again; but presume I will be recharactering much of it next year.
I may be changing where I have it later this year. Can I still recharacterize if I move it?