Get a head start on your taxes and save money by downloading the TurboTax app. (iStock) Tax season is here, and while filing may not top your current to-do list, waiting until the April 15 deadline only adds stress. TurboTax’s mobile app walks you through the process step by step from your phone, and right now eligible users can file federal and state returns — including many complex situations — for free. If you did not use TurboTax last year and complete your return through the mobile app by