<prompt> Human: Hello PF!I have only been a legal adult, and doing my taxes, for a few years now. Last year when I did them, I OWED money. I have no idea how. I had to go to the IRS office and write my own little check for around 170 dollars.I, for the most part, believe that I understand taxes. When I start a job, I declare 1 for myself. I live by myself, so I obviously have zero dependents. Money is taken out of all of my checks. I get paid every two weeks and always see that plenty of money in taxes is taken out.So my question is, why on earth would I owe the IRS money if I have filled out my W-4 correctly when I have started jobs? Is there something Im missing? Everyone else I know always gets tons of money back on their refund and I, not only dont get one, but I OWE money. Thanks for any help or for even reading!  <response>: I think the answers here miss the question. The question, as I understand it, is, if Im filing a 1040-EZ and Ive chosen 1 exemption on my W-4, why do I owe tax?Which seems to be a fair question, and perhaps better answered in rtaxes 