After you file

Nahh.......I checked back, and that particular one was for 2018 taxes, not 2019.

 

Still, if any of the forms you initially filed with, were later updated with some minor change....that could also be the reason you see a  non-zero in Fed tax when you start an amended tax return.

____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*