Okay, I believe my wife has wrongly filed her taxes. Backstory: I moved in with her in late January/early February of 2009. We were married on March 6th. She told me in mid-October that she was not happy with the marriage and I ended up moving out the last week of October. We have no children together but she has two young sons from an earlier relationship (ages 3 and 5) who lived with us the whole time we were together and who lived with her when we weren't together. She got her W-2 before me and hurriedly filed as single/head of household under her maiden name (apparently she never had it changed with the social security administration). Note that we are NOT divorced OR legally separated. We have simply been living apart since late October. We are planning on getting a dissolution. I paid a good chunk of the bills (mostly rent) while we lived together. Overall I'd say it was about even up as far as how much we both spent on bills – she mainly paid utilities and bought groceries. Because of what she did I have no choice but to file married but separate which is going to cost me $525.00. Meanwhile she got back at least $4000.00. I can tell she doesn't want to give me any money, not even enough to cover my loss (doubt I would have had to pay if we had filed jointly). Yes, she is that shady. She is also quite adept at lying. She has also been blowing money left and right, despite her claims of desperately needing it (she is in the process of moving). Nice gal I married. Anyway, I believe from what I've read, and I've also asked an attorney who specializes in taxes and he agrees, that she filed illegally. Now she's claiming that she's hired an attorney and that he didn't see a problem with how she filed. So who's right? Is there any way she could legally file as head of household even though she is still married? Keep in mind that we've only been separated since late October. We live in Ohio. I would love to be able to report her to the IRS, even though it's not likely anything would come of it. I know I have no real way of getting money out of her (and she'll soon have it spent, new boyfriend - #2 since we split - and all) so it's pretty much looking like I'll have to eat the five hundred plus while she gets to go out and have fun. Sigh.