Alabama charges a state gasoline excise tax of 29 cents per gallon in 2025, with diesel taxed at 30 cents per gallon, under the Rebuild Alabama Act of 2019. Unlike sales tax, fuel excise is baked directly into the pump price, so most drivers never see exactly how much they pay. This calculator applies the real Alabama state excise plus the federal excise (18.4¢ gasoline, 24.4¢ diesel) to either your annual mileage or your tank size and fill-up frequency, then shows the total fuel tax you pay each year — and your tax per mile driven.
How it works
The tool figures out how many gallons you buy per year, then multiplies by the per-gallon excise rates.
Annual-mileage mode estimates gallons from how far you drive and your fuel economy:
Gallons = Miles driven ÷ MPG
Tank mode estimates gallons from your tank size and how often you fill:
Gallons = Tank size × Fill-ups per year
Each rate is then applied separately:
State tax = Gallons × Alabama excise Federal tax = Gallons × Federal excise Total fuel tax = State tax + Federal tax
In annual mode the tool also divides the combined per-gallon rate by your MPG to show the tax-per-mile you pay just in fuel excise.
Alabama fuel tax explained
The Rebuild Alabama Act raised the gasoline excise by 10 cents over three years (2019–2021) and indexed future changes to the National Highway Construction Cost Index, allowing adjustments of up to 1 cent every two years. As of 2025 the gasoline rate is 29 cents per gallon and diesel is 30 cents. These funds are dedicated to road and bridge maintenance.
Federal excise has been fixed since 1993 at 18.4 cents per gallon for gasoline and 24.4 cents for diesel. So a typical Alabama gasoline buyer pays roughly 47.4 cents of tax per gallon at the pump.
Worked example
A commuter drives 12,000 miles per year in a car that gets 25 MPG on gasoline:
- Gallons = 12,000 ÷ 25 = 480 gallons
- Alabama excise = 480 × $0.29 = $139.20
- Federal excise = 480 × $0.184 = $88.32
- Total fuel tax = $227.52 per year
- Tax per mile = $0.474 ÷ 25 = $0.0190 per mile
Note: Some Alabama counties and cities add a small additional per-gallon local fuel tax. This calculator covers the state and federal excise only. For local fuel taxes and the latest indexed rate, check the Alabama Department of Revenue at revenue.alabama.gov.