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I believe have always reported as rolling into Roth IRA. There are 3 years of  corrected 1099-R. All of them behave similarly. I don't think I made a mistake in all 3 years. And in the amendment, I carefully choose rolling into Roth IRA. Is there a way I can check what I had reported in those years? Which line which form?

Also, now when I change box 2(a), the large amount of tax appeared immediately, without me even going to the later steps of choosing whether to Roth IRA or traditional. Since I haven't even gone to that step, that means it's using whatever it had before, correct? If I had chosen traditional in the past, it should still stay as traditional before I get to the later step of choosing Roth IRA,  and don't give me the large sum of taxes immediately. But  TT immediately increases the taxes from 0 to large sum.

Anyhow, where in the form can I find which IRA I filed in the past?