<prompt> Human: So as the title mentions I am Married and filling joint. We make combined around 77k.This year we had our second child, but when I go to file my taxes its telling us we owe around 500 on federal. We both claim 0 and our filing is almost the exact same as last year accept the 2k raise we got.We are wondering how this is? We did not move up a bracket and gained a child and yet we owe compared to last year when we received 1400 from federalCan anyone help explain this to me?  <response>: You may have changed one w4 from single 0 to married 0, not realizing the impact that would have.Can you compare how much you withheld this year, to what you had withheld last year? 