When using the TurboTax online editions the tax return cannot be e-filed or printed until you pay the TurboTax account fees.
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.
However, you can view your Form 1040 at any time. Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.
If you want to give the lender a copy of a 2020 tax return, which you have not filed, get the Form 1040 in fillable PDF form from the IRS website and enter your numbers. They will ask you to sign it.
Note: your loan application should be based on your latest tax return, i.e. 2019.