To download the 2020 tax return as a PDF you will first have to pay the TurboTax account fees or if you have e-filed the tax return wait for the federal tax return to be accepted by the IRS.
To pay the TurboTax online account fees by credit card, without completing the 2020 return at this time, click on Tax Tools on the left side of the online program screen. Then click on Print Center. Then click on Print, save or preview this year's return. On the next page, to pay by credit card, click Pay Now. The next screen will show a review of your Fees, click on Continue. Complete the next screen to pay by credit card and click Continue.