You will not be able to
e-file your 2016 tax return, you will have to print and mail your taxes to the IRS. TurboTax Online is not available for
prior-year tax returns. You will have to purchase TurboTax Cd/Download for Windows or Mac and install it on
your computer.
Please see the TurboTax faq on how to file a prior year tax:
https://ttlc.intuit.com/replies/3301770