California's diesel tax rate of 68.0¢ per gallon is the 2nd highest in the US. Fuel up in Nevada (27.8¢) or Arizona (26.0¢) before crossing into CA — and calculate exactly what you owe.
Calculate Your California IFTA Tax
Gallons consumed in CA→
Net taxable gallons→
CA tax rate (2026)→68.0¢/gal
Estimated CA IFTA→
Positive = amount owed to California; negative = credit. California's high rate means maximizing pre-entry fueling saves significantly per quarterly filing.
California IFTA Rates & Trucking Overview 2026
California's diesel tax rate of 68.0 cents per gallon is the second highest in the country, trailing only Pennsylvania's 74.1¢. The rate includes a state excise component plus a variable portion indexed to diesel prices. For every gallon you consume in California but didn't buy there, you owe the difference through IFTA.
The practical implication is clear: fill up completely in Nevada (27.8¢) before entering via I-15 or I-80, or fill up in Arizona (26.0¢) before entering via I-10 or I-40. On a 150-gallon tank, the IFTA savings from fueling in Nevada instead of California are approximately $60 per fill (150 gal × $0.402 difference).
Major California Trucking Routes
I-5 (Pacific Coast Spine): Oregon border to LA to San Diego/Mexico. Highest-volume freight corridor in the western US, especially from LA Basin north through the Central Valley. I-10 (East-West): Arizona border through Indio, Los Angeles. Port of LA/Long Beach container freight moves on this corridor. I-15: Nevada border south through Barstow, San Bernardino to San Diego. Main entry from Nevada — fuel in NV before entering. I-80: Nevada border through Sacramento to the Bay Area. Main northern entry — fuel in Reno/Sparks, NV before crossing.
California IFTA — Frequently Asked Questions
What is the California IFTA diesel tax rate in 2026?
California's IFTA diesel tax rate for 2026 is 68.0 cents per gallon — the second highest in the US after Pennsylvania (74.1¢). California's rate includes a state excise tax plus a variable excise component tied to diesel prices, so it can change between quarters.
Should I fill up before entering California?
Yes. For IFTA purposes, every gallon consumed in California at 68.0¢ vs. fueling in Nevada at 27.8¢ is a 40.2¢/gal difference. On a 150-gallon fill, that's $60 in IFTA savings. Tank up in Reno (I-80) or Primm/Henderson (I-15) before entering CA.
Does California have additional trucking fees beyond IFTA?
Yes. California has CARB emissions compliance requirements (Clean Truck Check), DMV weight fees, and potential CA Highway Use Tax obligations. These are entirely separate from IFTA — which only covers fuel tax. CARB non-compliance fines can far exceed any fuel tax savings.
Who handles California IFTA registration?
California IFTA registration and quarterly filing is handled by the California Department of Tax and Fee Administration (CDTFA) at cdtfa.ca.gov. CA-based carriers receive CA IFTA credentials and file quarterly returns online. Due dates: Q1 April 30, Q2 July 31, Q3 October 31, Q4 January 31.