Midpack
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
I overpay a little making the same Fed and State estimated taxes and the same Roth conversion amounts for the 1st, 2nd and 3rd quarter every year. Then I get serious about nailing down my best estimate for what taxes will actually be due for year in December after our last dividends/STCG's and do a final precise Roth conversion amount in late Dec and precise estimated taxes by Jan 15. I track dividends, CGs, interest, conversion/distributions throughout the year but I don't bother to make precise tax payments or conversions in the first three quarters. YMMV