How much is the gas tax in Texas?

The Texas state gasoline excise tax is 20.0 cents per gallon, and it has not changed since 1991. Diesel is also taxed at 20.0 cents per gallon. Texas has no additional local gas tax on top of the state rate.

What is the total gas tax I pay at the pump in Texas?

On gasoline you pay the 20.0 cent Texas state excise plus the 18.4 cent federal excise, for a combined 38.4 cents per gallon. On diesel it is 20.0 cents state plus 24.4 cents federal, totaling 44.4 cents per gallon.

Does Texas have a local gas tax?

No. Unlike the general sales tax, which has local add-ons, the Texas fuel excise tax is a single statewide rate with no city or county component. Everyone in Texas pays the same 20 cents per gallon to the state.

How is the per-year fuel tax calculated?

The calculator estimates your annual gallons used, either from tank size times fills per year, or from annual mileage divided by your MPG. It then multiplies your gallons by the combined excise rate to show the state and federal tax you pay each year.

Is gas tax included in the price at the pump?

Yes. Both the state and federal excise taxes are already built into the per-gallon price you see at the pump. This calculator isolates the tax portion so you can see how much of each gallon goes to the government.

Texas Gas Tax Calculator

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What you actually pay in Texas fuel taxes

Texas has one of the lower state gas taxes in the country: a flat 20.0 cents per gallon that has stayed unchanged since 1991. There is no local add-on, so every driver in the state pays the same rate. This tool shows how much of each gallon — and each year of driving — goes to fuel excise tax once you stack the state and federal rates together.

How it works

The combined per-gallon excise is the state rate plus the federal rate:

Gasoline: 20.0¢ state + 18.4¢ federal = 38.4¢/gal
Diesel: 20.0¢ state + 24.4¢ federal = 44.4¢/gal

To get your annual burden, the calculator estimates how many gallons you buy:

tank mode:    gallons/year = tank size × fills per year
mileage mode: gallons/year = annual miles ÷ MPG

Then it multiplies gallons by the combined rate, and splits the result into the state and federal shares.

Tips and notes

These are excise taxes, already baked into the pump price — they are not added on top of what you see.
The mileage method is usually more accurate for estimating yearly cost, since it accounts for how far you actually drive.
Diesel carries a higher federal rate than gasoline, which is why diesel drivers pay more total fuel tax per gallon. Rates verified against the Texas Comptroller and federal schedules.