Natural Gas Tax

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Compressed natural gas used as a special motor fuel is subject to the state fuel excise tax rate of $0.32 per gasoline gallon equivalent, measured at 5.66 pounds (lbs.) or 126.67 cubic feet at a base temperature of 60 degrees Fahrenheit and a pressure of 14.7 lbs. per square inch. Liquefied natural gas is also subject to the excise tax rate of $0.349 per diesel gallon equivalent, measured at 6.06 lbs. For more information, see the Idaho Fuels Taxes and Fees website. (Reference Idaho Statutes 63-2402 and 63-2424)