<prompt> Human: Ive been employed at the same place since June 2015. The last week of 2016 was the last time my employer took out federal taxes from my paycheck. My allowances never changed from 0, yet as soon as 2017 started they stopped taking any federal taxes out. I didnt find out about this until I went to file my taxes. Im not sure as to what I can do or if there is anything at all that Im able to.  <response>: Ask your employer to fix the mistake and start withholding the correct amount from your paycheck. If they need you to, complete a new W-4 to indicate how much you want withheld. In the future, look at your paychecks more than once a year every time you receive one is a good interval and talk to your employer ASAP when something like this happens. You are going to owe money when you file your taxes unless your liability is 0, theres nothing to be done about that now. Your employer cannot go back in time and change your withholdings. 