<prompt> Human: I just recently finished up my taxes, and owe 100. Not a huge deal, but Id prefer to be at that 0 threshold, or get a slight refund. My question is how did the withholding in my paycheck get calculated, and why is it off? I want to adjust my extra withholdings this year to get it to 0, but Ill be getting a raise so I dont know how much extra to withhold!  <response>: Youre really the one in charge of calculating the withholding, given that your employer has no idea what your situation is regarding deductions and credits. I recommend you go to the IRS withholding calculator, and enter your information there. That uses the information about tax that has already been withheld this year, and will tell you how much should be withheld based on your income, dependents, etc. Once you have this information, file a W-4 form with your HR Department with the revised withholding information, and you should be good to go. 