Can I still e-file a 2014, 2013, or earlier tax return?
Not if you're filing a personal (1040) return, which has an e-filing window from January to mid-October after the tax year ends.
For example, the 2014 tax year ended on December 31, 2014, so that means personal returns were "e-fileable" in TurboTax from January through mid-October of 2015.
In TurboTax Business, 2014 corporate and partnership returns are the only prior tax year/entities that can still be e-filed.
Tip: 2014, 2013, and 2012 returns can still be paper-filed using TurboTax. Simply purchase the software and install it on your computer. TurboTax Online is not available for prior-year tax returns.