You cannot file past returns online or e-file. TurboTax only supports the past 3 years (2014-2016) desktop products. You cannot get a refund for any tax year before 2014 since the statute of limitations for refund has expired.
You might be better off seeing a tax professional for the past returns particularly if you owe back taxes.
You can purchase 2014-2016 software here but might be able to find it cheaper elsewhere.
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.**
