You can file 2017 first. You are not required to file for 2016, but you may be able to get a refund if you do. You will have to paper file 2016 (print out and mail) because the IRS is no longer accepting e-filing for 2016. Click here for a link to TurboTax website where you can purchase the CD/Download version of TurboTax: File
past year tax return for 2016.
