What is South Dakota's gas tax rate?

South Dakota levies a state motor-fuel excise tax of 28 cents per gallon on gasoline. On top of that, the federal government adds 18.4 cents per gallon, so the combined excise on a gallon of gas pumped in South Dakota is about 46.4 cents before any sales tax considerations.

Does the federal gas tax apply in South Dakota too?

Yes. The federal excise tax of 18.4 cents per gallon of gasoline applies in every state, including South Dakota. This tool adds it to the state rate so the per-gallon figure reflects the full excise you pay at the pump.

How do I find my annual gas tax?

Switch to annual-mileage mode and enter your yearly miles and your vehicle's fuel economy in miles per gallon. The tool divides miles by MPG to get gallons burned per year, then multiplies by the combined per-gallon excise to estimate your yearly fuel-tax cost.

Is gas taxed by sales tax in South Dakota?

South Dakota's motor-fuel tax is a per-gallon excise rather than a percentage sales tax, and the general state sales tax does not apply to gasoline. That means the tax you pay rises with gallons pumped, not with the pump price, so a price spike does not increase the per-gallon tax.

Why is diesel taxed differently?

South Dakota and the federal government set separate excise rates for diesel and other special fuels, which usually differ from the gasoline rate. This calculator uses the gasoline rates by default; if you drive a diesel, replace the rates with the applicable diesel excise figures.

South Dakota Gas Tax Calculator

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South Dakota charges a 28-cent-per-gallon state excise tax on gasoline, and the federal government adds 18.4 cents per gallon on top. Because these are per-gallon excises rather than percentage sales taxes, your fuel-tax cost depends on how many gallons you burn, not on the pump price. This tool turns your fill-up size or annual mileage into a real fuel-tax figure.

How it works

The combined per-gallon excise is the sum of the state and federal rates, and your cost is gallons times that rate:

combined per-gallon = state excise + federal excise
fill-up tax         = gallons × combined per-gallon
annual gallons      = annual miles ÷ MPG
annual fuel tax     = annual gallons × combined per-gallon

In annual mode the tool divides your yearly miles by your fuel economy to get the gallons you burn, then applies the combined excise. A more efficient vehicle burns fewer gallons and therefore pays less total fuel tax for the same miles.

Example and notes

At a combined 0.28 + 0.184 = 0.464 dollars per gallon, a 15-gallon fill-up costs 15 × 0.464 = 6.96 dollars in fuel tax. Driving 12,000 miles a year in a 25-MPG car burns 12,000 ÷ 25 = 480 gallons, for 480 × 0.464 = 222.72 dollars of annual fuel tax. Diesel and ethanol blends carry different excise rates; swap the rate inputs if you don’t run on regular gasoline.