The Roth conversion performed in 2020 will be reported on your 2020 tax return. Near the end of January 2021 you'll receive the Form 1099-R that you'll enter into 2021 TurboTax and indicate that you converted the distribution to Roth. The amount from line 14 of your 2020 Form 8606 will transfer to line 2 of your 2021 Form 8606 to be used in calculation the taxable amount of your Roth conversion.
