I had a distribution from an inherited IRA. I put the amounts from my 1099-R into TurboTax, with the Gross Distribution and Taxable Amount being the same number. That increased my "Federal Tax Due" amount as I expected. When TurboTax asked for the amount of the Required Minimum Distribution, I put the full amount of the distribution, and the Federal Tax Due went up twice as much as when I first input the amount from the 1099-R.
Is that a glitch?