You can file your 2016 taxes, it's not too late. If you owe money to the government, then you will also have to pay interest and penalty.
You
will not be able to e-file your 2016 tax return, you will have to 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 read the TurboTax for more information:
https://ttlc.intuit.com/replies/3301607