How much is gas tax in Arizona?

Arizona charges an 18-cent-per-gallon state gasoline excise tax plus a 1-cent-per-gallon underground storage tank (UST) fee, for 19 cents of state-level tax. On top of that, the federal gasoline excise is 18.4 cents per gallon, so total tax is about 37.4 cents per gallon of gasoline.

Is Arizona's gas tax high or low?

Arizona's state gas tax is on the lower end nationally. At 18 cents per gallon (plus the 1-cent UST fee), it is well below states like California or Pennsylvania that charge 50 cents or more. Arizona has not raised its base gasoline rate in decades.

How do I figure gas tax per fill-up?

Multiply your tank size in gallons by the combined per-gallon tax rate. For Arizona that is roughly 37.4 cents (19 cents state plus 18.4 cents federal). A 15-gallon fill-up carries about $5.61 in combined fuel tax.

How much gas tax do I pay per year?

Divide your annual miles by your vehicle's MPG to get gallons used, then multiply by the combined per-gallon tax. A car driven 12,000 miles a year at 25 MPG burns 480 gallons, paying roughly $179 in combined Arizona and federal gas tax.

Does diesel have a different rate?

Yes. This tool covers gasoline. Arizona taxes diesel used by light vehicles at 18 cents but charges 26 cents per gallon on diesel used by heavy commercial vehicles, and the federal diesel excise is 24.4 cents. For diesel trucks the total per-gallon tax is higher.

Arizona Gas Tax Calculator

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The Arizona Gas Tax Calculator shows how much fuel tax you pay in Arizona, per fill-up or per year. Arizona charges an 18-cent state gasoline excise plus a 1-cent underground-storage-tank (UST) fee, and the federal excise adds 18.4 cents — about 37.4 cents per gallon total. Enter a tank size or your annual mileage and MPG.

How it works

The combined per-gallon rate is the sum of the three components:

az state excise   = $0.18 / gal
az UST fee        = $0.01 / gal
federal excise    = $0.184 / gal
combined          = $0.374 / gal

per fill-up:  gallons x combined
per year:     gallons = annual miles / MPG
              tax = gallons x combined

For the annual mode the tool converts miles and MPG into gallons burned, then multiplies by the combined rate. Each tax component is shown separately so you can see the state and federal split.

Example and notes

A 15-gallon fill-up:

state excise:  15 x 0.18  = $2.70
UST fee:       15 x 0.01  = $0.15
federal:       15 x 0.184 = $2.76
combined:      15 x 0.374 = $5.61

Annual: 12,000 miles at 25 MPG = 480 gallons; 480 x 0.374 = $179.52 per year.

Arizona’s base 18-cent rate is low compared with most states.
Diesel for heavy vehicles is taxed at a higher rate — this tool is for gasoline.
Pump prices already include these taxes; this shows the tax portion. Runs in your browser.