Question About 1095-A

I am retired.  My income is SS and my healthcare is Medicare. 

My wife is still working (2 days a week).  So she's had to provide her own healthcare benefits (Marketplace - aka Obama Care).  I just entered a 1095-A for my wife. I watched my Federal taxes go from a $1145 refund to a $4,514 PAYMENT to the IRS immediately after entering all the 1095-A data!  I am stunned!  What caused this and how can I prevent it this year (already near the end of Q1!).   Once I saw that, I stopped dead in my tracks.  This is CRAZY!  

 

Any and all help appreciated!

Pete