I did ours last night and with the child care tax credit, our federal effective tax rate went down about 2% since last year. Without the child tax credit it would have been the same effective tax rate. We still owe because we deliberately under-withhold (I'd rather make interest on my money than give it to the government early) but it's consistent with past years. One "oops" is that I stopped getting tax receipts for my charitable donations (non-cash donations of goods) since I knew we wouldn't be itemizing for our federal taxes, totally forgetting that it was still to our benefit to itemize on our state taxes. So I missed out on a few hundred dollars in deductions.