IFTA Tax Rate

Definition

An IFTA tax rate is the per-gallon fuel-tax rate each IFTA member jurisdiction publishes quarterly under the IFTA Articles of Agreement. Rates can vary by fuel type (diesel, gasoline, biodiesel, LNG, CNG, propane, methanol, ethanol). The IFTA processing center at iftach.org publishes the consolidated rate matrix every quarter; carriers and software vendors download the matrix to compute net tax-due on the quarterly return. Rates change frequently - Q4 2025 saw shifts in 14 jurisdictions, primarily for LNG and CNG. Using a stale rate matrix is one of the most common IFTA quarterly-return errors and can trigger assessment letters during audit.