The TurboTax online editions are only for tax year 2020.
To complete and file a prior year tax return, 2019 thru 2017, using TurboTax you would need to purchase, download and install on a personal computer one of the desktop editions for each tax year required from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A prior year tax return can only be printed and mailed, it cannot be e-filed. When mailing multiple tax years use a separate envelope for each tax year being mailed.
