<prompt> Human: Hello pf,As the title states, I am confused about how I can possibly owe on my federal taxes. Here is my situation and why I am so confused:I graduated in may full time student, no income.After graduating, I worked as a 1099 consultant for 3.5 months and earned 10,500 3,000mo. I have my 1099-MISC.For the last 4 months of the year, I was a full time employee for the same company that paid me as 1099 bumped up to 3,666mo.Rather than file quarterly estimated taxes once, I just had my employer withhold extra for my last 4 paychecks in the amount of 335- federal, for a total of 1,340. Additionally, I claimed 0 instead of 1 on my W-4- shouldnt this alone come close to covering for the unpaid 1099 taxes???Other info: I am being claimed as a dependent by my parents for 2015. Because of this, I apparently get no credit for the 1,800 worth of student loan interest I paid this is so dumb I want to scream.I wrote off the mileage I used during my commute as a 1099 I kept track of this, it was 1721 miles over the 3.5 months.I opened a RothIRA and put 1,000 planning on adding more before April deadline. This had no effect but I just wanted to mention it.After putting all my info in, it says I owe 225. HOW??EDIT: When I make no changes except removing my 10,500 1099 income, TurboTax says my federal refund should be 2,584. Assistant: Probably self employment taxes 15.3 on the 1099 income.Sorry to be unclear, I meant the difference between what you are expecting and owing is probably due to self employment taxes, which are in addition to income taxes.Human: 10,500x.153 1.606.51. I had 1340 extra withheld2. I claimed 03. Making no changes but removing my 10,500 1099 income, turbotax says my refund should be 2,584.Something just isnt adding up.  <response>: Youre paying SE tax 1,484 and income tax on your SE income plus your wages. One half of your SE tax 742 is a deduction whether you are claimed as a dependent or not. 