Yes they are prepayments for next year when we do our 2021 return. They are 4 quarterly payments. The 1040ES quarterly estimates are due April 15, June 15, Sept 15 and Jan 18, 2022. Your state will also have their own estimate forms.
Turbo Tax calculated them because you owed too much on your tax return this year. They are like withholding taken out of your paychecks. Nothing to do with your 2020 return now.
