You can't do a prior year return online or efile it, but you can buy the Desktop Download versions for 2014-2016 from Turbo Tax here. Be sure to pick the right one, Windows or Mac....
<a rel="nofollow" target="_blank" href="
http://turbotax.intuit.com/personal-taxes/past-years-products.jsp">http://turbotax.intuit.com/person...>
Or you can check for Turbo Tax for all years on Ebay or Amazon, etc.
Either way you will have to mail in your return. And if you are doing more than 1 year, send each year in a separate envelope. Sometimes the IRS will just staple all the sheets together and miss a second return.
Or if you have a simple return you can get the blank forms from the IRS and fill them in by hand for free. Here are some blank forms & instructions for 2016
1040 <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-prior/f1040--2016.pdf">https://www.irs.gov/pub/irs-prior/f1040--2016.pdf...Instructions <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-prior/i1040gi--2016.pdf">https://www.irs.gov/pub/irs-prior/i1040gi--2016...>
1040A <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-prior/f1040a--2016.pdf">https://www.irs.gov/pub/irs-prior/f1040a--2016.p...Instructions <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-prior/i1040a--2016.pdf">https://www.irs.gov/pub/irs-prior/i1040a--2016.p...>
1040EZ <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-prior/f1040ez--2016.pdf">https://www.irs.gov/pub/irs-prior/f1040ez--2016...Instructions <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-prior/i1040ez--2016.pdf">https://www.irs.gov/pub/irs-prior/i1040ez--2016...>
2016 Tax Tables <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-prior/i1040tt--2016.pdf">https://www.irs.gov/pub/irs-prior/i1040tt--2016...>
Publication 17 Tax Guide for 2016 <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-prior/p17--2016.pdf">https://www.irs.gov/pub/irs-prior/p17--2016.pdf</a>
