Houston trucking businesses, here's your complete IFTA filing guide quarterly deadlines, how to calculate fuel tax, common mistakes If you’re running a truck out of Houston whether you’re an owner-operator hauling freight along I-10 or a fleet company moving containers from the Port of Houston, IFTA is one of those things you can’t afford to get wrong. Miss a filing and you’re looking at fines, license suspension, and audits that can sideline your operation for weeks. This guide breaks it all down.