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Idaho's Gas Tax Over the Years

6/12/2024

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Idaho’s state gasoline tax hasn’t really raised in a hundred and one years. I have your attention with that statement, don’t I?
 
In 1923, Idaho instituted its first tax on gasoline. The Legislature that year tacked two cents onto each gallon of gas for road building and repair. Gas cost about 22 cents a gallon. Automobile owners were generally supportive of the effort.
 
Today, Idaho’s state gasoline tax is 32 cents per gallon, so it has obviously gone up. But factor in inflation. That two cents from 1923 would have 37 cents of buying power today. So, the buying power of today’s gas tax is actually less than that original two-cent-tax.
 
The two-cent tax became a three-cent tax in 1925, a four-cent tax in 1927, and a nickel in 1929. The state was in a road-building frenzy. The tax remained the same until 1945 when it went to 6 cents. It hung around in that neighborhood for 23 years, going to seven cents in 1968. Four years later, the tax went to 8.5 cents a gallon. In 1976 it hit 9.5 cents. In 1981, the Legislature moved it to 11.5 cents. That was so much fun that they raised it an additional penny the next year. Giddy with that accomplishment, lawmakers moved it two cents in 1983 to 14.5 cents per gallon. It stayed there until 1988 when it jumped to 18 cents. In 1991 the tax moved 21 cents.
 
Are you seeing a pattern here?
 
The first time Idahoans started paying a quarter in tax for every gallon of gas was in 1996. That was more than a gallon of gas cost back in 1923 when the whole thing started. In 2015 the state gasoline tax went to 32 cents per gallon (effective in 2017), which is where it is today.
 
It was also in 2015 that the Legislature took notice of scoundrels like me who don’t pay any gasoline tax because we don’t buy any gasoline. They added $140 to annual registration fees for electric vehicles to help maintain roads.
 
 Are roads better today than they were in 1923 when all this began? Considerably. They’re also a lot more expensive to build and maintain, so look for future gas tax increases or some other method to help pay for them from some future Legislature.
 
What other method? How about one that more fairly accounts for road use, such as a mileage fee on all cars, gas, electric, or hydrogen? That’s simple, but it doesn’t take into account vehicles' weight, which is an important factor when determining their impact on road wear.
 
It gets so complicated you may just decide to walk, instead.

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Some pumps in Twin Falls in 1942. Photo by Russell Lee, Library of Congress.
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    Author, Speaker

    Rick Just has been writing about Idaho history since 1989 when he wrote and recorded scripts for the Idaho Centennial Commission’s daily radio program, Idaho Snapshots. One of his Idaho books explores the history of Idaho's state parks: Images of America, Idaho State Parks. Rick also writes a regular column for Boise Weekly.

    Rick does public presentations on Idaho's state park history and the history of the Morrisite war for the Idaho Humanities Council's Speakers Bureau.idahohumanities.org/programs/inquiring-idaho/
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