Washington State Gas Tax Increase and Allocation

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In July 2025, Washington State increased its gasoline tax to 55.4 cents per gallon, a 6-cent increase approved by the state legislature. The gas tax revenue is allocated primarily to transportation-related purposes as mandated by the 18th Amendment to the Washington State Constitution. Approximately 70-80 cents of every dollar goes to road and highway maintenance and construction, 10-15 cents supports the Washington Ferry System, 5-10 cents pays the debt of past transportation projects, and the remaining funds cover various transportation items including administrative costs and safety programs.