Texas's IFTA diesel tax rate is 20.0¢ per gallon (2Q 2026). Calculate your IFTA fuel tax liability for Texas routes.
Texas's diesel fuel tax rate is 20.0 cents per gallon (2Q 2026). For IFTA purposes, every gallon you consume in Texas is taxed at this rate.
Texas handles more interstate freight movement than any other state — not just because of its size, but because of its position as the NAFTA corridor to Mexico. The Dallas-Fort Worth metroplex is the #2 freight market in the US after Los Angeles. Houston is a top-5 port city and home to the nation's largest petrochemical freight complex.
I-35 (NAFTA Corridor): Laredo–San Antonio–Austin–Dallas–Oklahoma City. Highest truck volume in Texas, especially around Laredo/Nuevo Laredo border crossings.
I-10 (East-West Spine): El Paso–San Antonio–Houston–Louisiana border. Major petrochemical, port, and intermodal freight corridor.
I-20: Midland/Odessa oilfield freight through Dallas east to Shreveport, LA.
I-45: Houston–Dallas, heavy chemical plant and port-related freight.
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