After you file

see what happens if you leave 0 fields blank. 

So using the healthcare tax tool on healthcare.gov, I determined the correct subsidy for those 4 months (and it turned out to be exactly the same as the other 8 months as listed on my 1095-A form so no surprise there). I completed and sent my return.

 

 

try lowering 1 month in the b column by $1

and then increasing another month by $1. 

the same for column c

thus the totals will be the same but the months will be de different which will hopefully populate the detail lines