<prompt> Human: So when I got my W-2 I ended up owing money to federal and state. I checked my W-4 and I had being exempt marked. I talked to my HR person at my job and she said that I shouldnt be eligible to be exempt. So what will happen? Any help is appreciated.Edit: Thanks for your help everyone. I have already corrected my W4 going forward and I do plan on paying what I owe in full. I just wanted to know what is going to happen since I usually get money back for taxes. Its my fault for not checking my stubs. Getting it electronically made me not notice nothing was being withheld. I did enjoy the fat check though!  <response>: You will have to pay the taxes and you may end up being assessed a penalty if you withheld too little. 