What is the Louisiana gas tax per gallon?

Louisiana charges a state excise tax of 20 cents per gallon on gasoline. That includes the 16-cent base rate plus a 4-cent Transportation Infrastructure Model for Economic Development (TIMED) levy, and it has been stable for years.

How much is the federal gas tax?

The federal gasoline excise tax is 18.4 cents per gallon nationwide and has been unchanged since 1993. Combined with Louisiana's 20 cents, you pay 38.4 cents of excise tax on every gallon of gasoline.

Is gas tax included in the pump price?

Yes. Both the state and federal excise taxes are built into the price you see at the pump, not added at checkout. This calculator backs out how much of your total fuel spend is actually tax.

Is diesel taxed the same as gasoline?

No. Louisiana's diesel excise is also 20 cents per gallon, but the federal diesel excise is 24.4 cents rather than 18.4 cents, so diesel carries a higher combined excise of 44.4 cents per gallon. This tool uses the gasoline rates.

Does Louisiana add sales tax to gasoline?

No. Gasoline is exempt from Louisiana's general state sales tax; it is taxed only through the per-gallon excise. That is why the excise figure here represents essentially all the tax you pay on fuel.

Louisiana Gas Tax Calculator

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Roughly 38 cents of every gallon you buy in Louisiana is tax: 20 cents to the state and 18.4 cents to the federal government. This calculator turns that into a real number for your tank and your year so you can see how much of your fuel spend is excise tax.

How it works

The combined excise is a fixed amount per gallon, so the math is straightforward:

combined rate = $0.20 (state) + $0.184 (federal) = $0.384 per gallon

per fill-up:  gallons = tank size
              tax     = gallons × $0.384

per year:     gallons = annual miles ÷ MPG
              tax     = gallons × $0.384

Because the tax is per gallon, your fuel economy matters: a more efficient vehicle burns fewer gallons over the same miles and therefore pays less total excise, even though the per-gallon rate is identical for everyone.

Example and notes

Driving 12,000 miles a year at 25 MPG burns 480 gallons, so you pay about $184 in combined fuel excise — $96 to Louisiana and $88 to the federal government. A single 15-gallon fill-up carries about $5.76 of excise tax. Diesel vehicles pay more because the federal diesel rate is 24.4 cents; switch your real-world numbers accordingly if you drive a diesel.