Each tax year is a separate TurboTax program. The TurboTax online editions are only for tax year 2018.
If you choose to use TurboTax to complete and file a 2017 tax return you will need to purchase, download and install on a personal computer one of the 2017 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2017 tax return can only be printed and mailed, it cannot be e-filed.
