2020 tax forms are not ready yet. The TurboTax software is also not fully ready. You will not be able to file until the last week in January. This situation happens every year, but 2020 may be the worst yet.
"In essence, the stimulus check acts as an advance of your 2020 income tax refund. This means when you prepare your 2020 income tax return, there will be a line to include the section 6428 credit (line 30 on the 2020 form 1040). The credit on your 2020 return is subtracted by any amount received as a stimulus check in 2020. If the amount you received as a stimulus check is less than the credit you are due, the difference will be included as part of your 2020 refund. If you have been overpaid by receiving the stimulus check, however, you will not be required to return any excess amount".
The TT interview will ask about the stimulus, in the Federal Review section, near the end of the program.
