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Washington Gas Tax (2026)

Conditional: 56.5 cents/gallon state gasoline tax effective July 1, 2026 (diesel 59.5c) - up 1.1c under the first automatic annual inflation adjustment enacted in 2025; among the highest in the nation, per the DOL July-Dec 2026 rate table.

ConditionalVerified Jul 2, 2026
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56.5 cents/gallon state gasoline tax effective July 1, 2026 (diesel 59.5c) - up 1.1c under the first automatic annual inflation adjustment enacted in 2025; among the highest in the nation, per the DOL July-Dec 2026 rate table. Separate Climate Commitment Act carbon costs add more at the pump. Excludes the 18.4c federal tax.

Official source: dol.wa.gov →

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Gas Tax in states bordering Washington

The same rule in each neighboring state LawLert has verified, from that state’s own official source.

  • IdahoInfo

    About 33 cents/gallon state gasoline tax (32c excise + 1c petroleum transfer fee), excludes the 18.4c federal tax.

    Verified May 31, 2026 · Source: tax.idaho.gov · Full Idaho rule →

  • OregonInfo

    40.0 cents/gallon state motor-fuel tax on gasoline, effective January 1, 2024 — the rate ODOT is required to publish for posting at service stations under ORS 646.932. Excludes the 18.4c federal tax.

    Verified Aug 16, 2026 · Source: oregon.gov · Full Oregon rule →

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