To complete and file a 2018 and 2017 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the 2018 and 2017 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2018 and 2017 tax return can only be printed and mailed, they cannot be e-filed. Use separate envelopes for each tax year when mailing.
