What is the Utah gas tax rate?

Utah's state gasoline excise tax is about 36.4 cents per gallon in 2024. Utah indexes the rate, adjusting it based on the statewide average fuel price and a statutory formula, so it changes over time within set bounds.

Is the federal gas tax included?

Yes. This tool adds the federal excise of 18.4 cents per gallon on gasoline (24.4 cents on diesel) to the Utah state rate. Both are baked into the price you see at the pump, so the total per gallon is roughly 55 cents on gasoline.

Does Utah tax diesel differently?

Utah applies the same special fuel (diesel) excise rate as gasoline, currently about 36.4 cents per gallon. The federal diesel rate is higher at 24.4 cents, so total diesel tax per gallon is a bit higher than gasoline.

How is tax per mile calculated?

The tool divides the combined per-gallon tax by your fuel economy in miles per gallon. A car getting 25 MPG with a 55 cent combined tax pays about 2.2 cents of fuel tax per mile driven.

Why does Utah's gas tax change?

Utah ties its motor fuel tax to a formula based on the average wholesale or rack price of fuel, with floors and caps. As fuel prices move and the legislature adjusts the formula, the rate steps up or down, so always verify the current rate.

Utah Gas Tax Calculator

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Every gallon you buy in Utah carries a state excise plus the federal excise, hidden inside the pump price. This calculator works out how much fuel tax you pay in a year, either from your mileage and MPG or from your tank size and fill-ups, and shows the combined tax per mile.

How it works

The tax per gallon is the sum of two excise taxes:

Utah gasoline excise   $0.364 / gal (2024, indexed)
Federal gasoline       $0.184 / gal
Combined gasoline      $0.548 / gal
(diesel: $0.364 state + $0.244 federal = $0.608)

Annual gallons come from either miles divided by MPG, or tank size times fill-ups per year. Multiply gallons by each excise rate to get the state and federal portions, then add them for your total fuel tax.

Example

A car driven 12,000 miles a year at 25 MPG burns 480 gallons. At a combined gasoline rate of about 54.8 cents per gallon, the fuel tax is roughly 263 dollars per year, or about 2.2 cents per mile driven.

Notes

Utah indexes its fuel tax, so the 36.4 cent figure can change between years. This tool estimates excise taxes only, not the general sales tax that may also apply in some cases. Verify the current rate at tax.utah.gov.