Married filing joint is always the best option for the couples. With that kind of income, having a kid does make a whole lot of difference. You loose credit when you file separately. Your child tax credit, credit for dependent care expenses; they phase out as your income increases. Commute mileage is not deductible. Like other people said, if your company made you travel, more than likely they reimbursed you. Also if you itemize, then your wife will have to itemize. Does she have enough to itemize? Itemized deductions creates red flag. Besides the interest on mortgage payments and property taxes, make sure you have proper documentation for everything else you are trying to claim. It can get messy down the road.