After you file

A 2014 tax return data cannot be transferred to the 2016 tax return.  

To e-file your 2016 tax return you will need the 2015 AGI or the 5 digit self-selected PIN you used for the 2015 tax return.  If you do not have a copy of the 2015 return then you can get a free federal tax return transcript from the IRS, online or by mail -  https://www.irs.gov/individuals/get-transcript