IFTA Tax Rates in Arizona (2026)

Key numbers at a glance

Arizona is where three of America's long-haul spines cross — I-10 from Texas to Los Angeles, I-40 from Albuquerque to Barstow, I-17 feeding Phoenix. Most of those miles connect to California, whose IFTA diesel rate is nearly four times Arizona's, so the rate you pay for burning Arizona asphalt is far friendlier than the one waiting across the Colorado River. The figures below come from the official IFTA Inc. fourth quarter 2026 tax rate matrix — as of Q4 2026 — always confirm the current quarter's official IFTA matrix before you file (this quarter's matrix is not final until December 4, 2026). See every state at once on the IFTA rates by state hub.

IFTA tax rates in Arizona

Arizona's fuel taxes are set by statute and have been stable for years — the gasoline excise has not moved since 1991, and the diesel rate that IFTA carriers use is the use fuel tax on heavy vehicles under Arizona DOT and ARS 28-5606:

That two-tier diesel structure is Arizona's quirk: the same gallon of clear diesel is taxed at 26.0 cents in a Class 8 semi and 18.0 cents in a pickup under 26,001 lbs. IFTA fleets run qualified motor vehicles, so 26.0 cents is the number for your return's diesel line. There is no separate Arizona surcharge line — unlike Indiana's surcharge schedule or Virginia's split base-plus-additional structure, Arizona files one rate per fuel and that is it.

How Arizona IFTA affects your filings

Your Arizona line on the quarterly return is Arizona miles divided by fleet MPG, times $0.260 for diesel. Take a southern California to Phoenix to Tucson run at 6.5 MPG with a New Mexico leg, and the return looks like this:

The asymmetry is the story: California is 23% of the miles but 55% of the tax. Now flip the fueling. Buy all 100 gallons in Arizona and you prepaid 26.0 cents a gallon — $26.00 — against $41.05 owed, leaving roughly $15.05 due. Buy the same gallons in California and you prepaid $97.90 and are owed a $56.85 refund, which is money you lent the state interest-free until the return clears. The smart play is to buy where the rate is high but the gallons are few — run the exact numbers in the IFTA calculator each quarter, and use the Q4 rate for a Q4 return, since a stale rate is a standard audit finding.

One more mechanic worth knowing: Arizona participates in the fuel tax reciprocity through IFTA like the other 47 contiguous states, so no trip permits or separate Arizona fuel filings are needed — your base state redistributes everything. Keep your ELD per-state mileage and receipts matched; border crossings at Blythe, Ehrenberg and Topock are where Arizona miles most often get mis-recorded.

Fueling strategy around Arizona: price minus tax

Shop by net price: pump price minus the state tax, plus a look at the rates ahead. The Q4 2026 neighbor map makes Arizona look like a fueling haven — Nevada 27.0 cents, New Mexico 21.0 cents, Utah 37.9 cents, and California 97.9 cents. The California play is the single biggest in the country: a truck that crosses the river with full tanks and buys the legal minimum inside California saves roughly 71.9 cents a gallon in tax timing versus fueling in Los Angeles. On I-40, New Mexico's 21.0 cents is 5 cents better than Arizona's, so top off in Gallup or Albuquerque westbound. On I-15 toward Utah, Utah's 37.9-cent rate argues for filling in Arizona first. A hundred gallons a month shifted from California pumps to Arizona pumps is over $8,600 a year in tax timing. Because diesel benchmark swings dwarf these tax gaps week to week, pair this with the fuel surcharge guide so your recovered surcharge and your fueling strategy work together instead of by accident.