I did a Roth conversion of a traditional IRA on 12/30. I used the What-if worksheet (selecting 2020 rates) from my Turbotax 2019, desktop version, to play around with how much tax I would owe with various Roth conversion amounts. Can anyone verify that the worksheet is accurate enough for basing the 4th quarter estimated tax payment due Jan 15th? I am reasonably sure that my input data is correct (i.e., income, estimated tax and withholding to date).
Alternatively, I was considering either buying TurboTax 2020 now and doing a mock tax return, or alternatively taking pen and paper in hand and calculating the tax from the Qualified Dividends and Capital Gain Tax Worksheet.
