You cannot file a 2020 tax return with TurboTax Online. You would need to purchase the Desktop (CD/Download) version to prepare your 2020 tax return with TurboTax. The software is installed on your computer. You can purchase the 2020 tax software from TurboTax, click on the following link.
https://turbotax.intuit.com/personal-taxes/past-years-products/
