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Thank you @ThomasM125, this is helpful. I'm still puzzled by these seemingly contradictory statements in your answer. I can't square: 

You would enter the current year contribution

with

You don't need to track previous year IRA non-deductible contributions since they are now in the ROTH IRA

 

So what do I enter in the box "Total Basis as of December 31, 2020" on the "Let's Find Your IRA Basis" Screen?

  • 0 because I should not be tracking it anymore
  • 5400 because that's what I converted in 2020
  • 6000 because that's what I converted in 2021 

Or are you telling me that by always entering the amount converted in the most recent year (in this case 6000) on this screen, and entering $0 for the prior year traditional IRA balance, then I will always get it right and the distribution will not be taxable?

 

Thanks again!