How should we go about splitting the tax return ? My 1 year old son, girlfriend and her son has been living together and I have paid majority of the household expenses. I pay $1200 in rent and she pays about $300 or less for utilities . Plus I providing a lot of the expenses for our children .I made over 3x as much as her (she made less than 20k) and she's filing both kids (I had the option but I denied because of school loans ) . So should I ask for half since I pay majority or let her keep most of it since she makes less?? I want to be fair not greedy .