2022 will be the first year I take some level of a withdrawal. In my prior (working) years, my tax returns were always done by an accountant and were much more complicated. While I will probably continue to use my accountant at least this year, I anticipate my return will be much simpler, but with plans to do Roth conversions into the 24% tax bracket until further notice. As part of some internal planning, I was playing around with the Turbo Tax Calculator. On first pass, I wanted to do a simple comparison of earned income vs. IRA withdrawal (both at the same amounts) with no other variables imputed, just standard deduction. To my surprise, the gross tax $$ were basically the same, within a couple hundred $$. My understanding is earned income should be taxed for SS/Medicare while IRA withdrawals (or Roth conversions) should not as it was previously taxed/addressed the past years of contributions? I realize in those tax years there was a cap on amounts actually taxed, but as I read it, IRA distributions are not subject to Social Security Tax? If that's the case, should I not have a higher tax amount using the tax calculator for earned income vs IRA distributions?