Oklahoma IFTA Calculator

Oklahoma has one of the lowest diesel tax rates in the country at $0.190 per gallon, making it a premier fueling state for carriers working the central US. Oklahoma City sits at the junction of I-40 (running east-west from Memphis to Amarillo), I-35 (running north-south from Kansas City to Dallas/Fort Worth), and I-44 (running from St. Louis to Wichita Falls). Tulsa is connected to I-44 and sits on the I-44 corridor as Oklahoma's second major city with significant oil and gas, aerospace, and manufacturing freight. The Will Rogers Turnpike (I-44 from Joplin, MO to Tulsa) and the Turner Turnpike (I-44 from Tulsa to OKC) are toll roads with commercial vehicle charges.

At $0.190, Oklahoma is dramatically cheaper than most surrounding states. Texas at $0.200 to the south is close. Missouri at $0.197 to the northeast is also cheap. But Kansas at $0.260, Colorado at $0.205, New Mexico at $0.210, Arkansas at $0.285, and especially Tennessee at $0.210 are all higher. For any carrier running I-40 east or north on I-35, fill up in Oklahoma before crossing into higher-rate states.

Standard weight limits are 80,000 lbs on interstates. Oklahoma has a significant permit load industry for oilfield equipment, wind turbine components, and agricultural equipment. The state operates a 24-hour online permit system through the Oklahoma DOT. Agricultural weight exemptions apply to certain state routes during harvest periods.

Weigh stations on I-35 near Guthrie (northbound) and Ardmore (southbound), on I-40 near Weatherford, and at the Texas border crossings are regularly active. Oklahoma uses WIM sensors to pre-screen vehicles before directing them to scale areas. For IFTA compliance, Oklahoma's Tax Commission processes IFTA filings through an online portal — with a low rate and high neighboring state rates, carriers who fuel heavily in Oklahoma before entering Texas-to-Midwest runs often show a net IFTA refund, which the state processes promptly.