I didn't file last year. How do I file last and this year together?

[xmasbaby0 · Accepted solution]

You cannot file two years together.  Each tax year is separate.

To file a return for a prior tax year

Only a 2016 return can be prepared online and e-filed. 

 If you need to prepare a return for 2013, 2014 or 2015 you can purchase and download desktop software to do it, then print, sign,  and mail the return(s)

https://turbotax.intuit.com/personal-taxes/past-years-products/

  (if you want to prepare on paper for free:  )

You can download the Forms and Instructions from the IRS web site:

http://www.irs.gov/app/picklist/list/priorFormPublication.html 

Remember to prepare your state return as well—if you live in a state that has a state income tax.