After you file

Please explain what all you are doing.

What do you mean by "recalculate last year's return?"    Are you referring to a 2017 return, and if so, was the 2017 return never filed, or are you saying you need to prepare a formal amended return Form 1040X to correct a 2017 return that you filed last year?

What year software do you have on your computer?  2017 or 2018?   Have you downloaded the *.tax2017 data file from your online account?