You can only use
Turbotax Online to file for the current
year (2016) taxes, and not for any other year.
If you would like to
use TurboTax for any other year you will need to purchase the Desktop Version
for the specific year for which you need to file a return. You can purchase the
Desktop version at this link:
http://shop.turbotax.intuit.com/personal-taxes/past-years-products.jsp
