ONLY 2018 can be prepared online and e-filed.
TurboTax 2015-2017 can only be done on a Mac or Windows computer and printed and mailed - e-file is not allowed.
You can purchase past years software here:
https://turbotax.intuit.com/personal-taxes/past-years-products/
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
