To file your previous year's return, you would need to purchase and download the year's desktop program from this website https://turbotax.intuit.com/personal-taxes/past-years-products/
Create
and complete the return using the desktop programs. Print, Sign and
Date each return for mailing since prior year returns cannot be
e-filed. Use separate envelopes for mailing each tax year.
For More Information on how to File Back Returns
https://turbotax.intuit.com/tax-tools/tax-tips/IRS-Tax-Return/How-Do-I-File-Back-Tax-Returns-/INF145...Hope this information is Helpful
