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Idaho Gas Tax (2026)

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

InfoVerified May 31, 2026

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Official source: tax.idaho.gov →

General legal information, not legal advice — verify important decisions with a licensed attorney.

Gas Tax in states bordering Idaho

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

MontanaInfo
33.0 cents/gallon state gasoline tax (unchanged); excludes the 18.4c federal tax.
Verified May 31, 2026 · Source: mdt.mt.gov · Full Montana rule →
NevadaInfo
23.81 cents/gallon in statewide gasoline taxes and fees (23c state excise + 0.75c cleanup fee + 0.055c inspection fee); counties add option and indexed taxes — for FY27 (from July 1, 2026) county-added taxes total ~39.8c in Clark and ~67.8c in Washoe. Excludes the 18.4c federal tax.
Verified Jul 16, 2026 · Source: dmv.nv.gov · Full Nevada 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 →
UtahInfo
31.9 cents/gallon state motor-fuel tax in effect July 1-Dec 31, 2026 - temporarily reduced from the 37.9c rate that applied Jan 1-Jun 30, 2026, per the Utah State Tax Commission rate table (listed as a separate Jul-Dec 2026 rate). Excludes the 18.4c federal tax.
Verified Jul 2, 2026 · Source: tax.utah.gov · Full Utah rule →
WashingtonConditional
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.
Verified Jul 2, 2026 · Source: dol.wa.gov · Full Washington rule →
WyomingInfo
24.0 cents/gallon state gasoline tax (23c excise + 1c license/cleanup fee); excludes the 18.4c federal tax.
Verified May 31, 2026 · Source: dot.state.wy.us · Full Wyoming rule →

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