TurboTax only supports the upcoming tax year 2015 and the prior 3 years (2014, 2013, and 2012). The latter 3 have to be prepared in desktop software (CD/download). Each tax year requires a different year software; i.e., 2014 can only prepare 2014 return; 2013 software can only prepare 2013 return, etc. Prior-year returns cannot be efiled; they must be printed and mailed.
NOTE: If you prepare returns for multiple years, do NOT mail them in the same envelope. Mail them separately.
You can see prices for
those 3 prior years at the link below if ordered directly from TurboTax, but
you may also be able to find them at a discount at reputable retailers like
Amazon:
https://turbotax.intuit.com/personal-taxes/past-years-products.jsp
See this FAQ on options for filing returns earlier
than 2012:
https://ttlc.intuit.com/questions/2559426-can-i-use-turbotax-to-file-a-2011-2010-2009-or-earlier-tax...
If you locate a company to file the older
returns, be sure it is a reputable company.
You can download the older-years forms and
instructions for free at the IRS website:
https://www.irs.gov/Forms-&-Pubs
and get your State tax forms and instructions on your state tax authority's website.