What is the District of Columbia gas tax rate?

The District of Columbia levies a per-gallon motor-fuel tax on gasoline of roughly 23.5 cents per gallon, in addition to the 18.4-cent federal excise tax. The exact District rate can change, so treat the default as an estimate and verify the current figure with the DC Office of Tax and Revenue.

Is the federal gas tax included?

Yes. On top of the District of Columbia tax, the federal government charges 18.4 cents per gallon of gasoline. This calculator adds the District and federal per-gallon taxes together so the total reflects everything baked into the pump price as fuel tax.

How is the per-mile gas tax figured?

When you calculate by annual mileage, the tool divides your miles by your miles-per-gallon to get gallons burned, multiplies by the combined per-gallon tax, then divides the total tax back by miles. That gives the effective gas tax you pay for every mile driven.

Does this include sales tax on gasoline?

No. This calculator covers only the per-gallon excise taxes (District of Columbia plus federal). It does not model any general sales tax, environmental fees, or distributor charges that may also be embedded in the retail price you see at the pump.

Why does my pump price differ from the tax shown?

The tax shown is only the excise tax portion. The remaining pump price reflects crude oil cost, refining, distribution, station margin, and any additional fees. Gas taxes are a fixed cents-per-gallon amount, so they are a smaller share of the price when fuel is expensive.

District of Columbia Gas Tax Calculator

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The District of Columbia adds a per-gallon motor-fuel tax to every gallon of gasoline, on top of the 18.4-cent federal excise tax. Because these are fixed cents-per-gallon amounts, the more you drive, the more gas tax you pay. This tool totals that tax by fill-up or by annual mileage.

How it works

Gas excise tax is a flat amount per gallon, so the math is gallons times the combined per-gallon rate:

combined per-gallon tax = DC rate + federal rate
by fill-up:  total tax = tank gallons × combined rate
by mileage:  gallons   = miles ÷ miles-per-gallon
             total tax = gallons × combined rate
             tax/mile  = total tax ÷ miles

The District of Columbia rate is roughly 23.5 cents and the federal rate is 18.4 cents per gallon, for a combined figure near 42 cents per gallon of gasoline.

Example and notes

Driving 12,000 miles a year at 25 miles per gallon burns 12,000 ÷ 25 = 480 gallons. At a combined 42 cents per gallon that is 480 × 0.42 = 201.60 dollars of gas tax a year, or about 201.60 ÷ 12,000 = 0.0168 dollars per mile. Diesel is taxed at a different rate, and excise rates change, so confirm the current District of Columbia figure with the DC Office of Tax and Revenue.