The TurboTax online editions are only for tax year 2017.
To complete a 2016 tax return using TurboTax you will need to purchase and download one of the 2016 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
If you started a 2016 return using the online editions then see this TurboTax support FAQ for completing the tax return - https://ttlc.intuit.com/questions/2559403-how-do-i-finish-a-prior-year-return-that-i-started-in-turb...
A 2016 tax return can only be printed and mailed, it cannot be e-filed.
