California fuel taxes

Fixed duties and percentage taxes work differently. These records preserve effective dates and unresolved checks.

Amounts are in local currency per litre. Percentage entries are recomputed from each observed price. Snapshot dates are identified in the notes.
Tax / fuel	Rate	Effective from	Through	Status and source
Excise Fixed gasoline	USD 0.2431/L	2026-07-01	Open / check source	Verification pending TODO: reconcile sales-tax base and local levies before deriving. 2.25% state sales tax on gasoline, 13.00% state sales tax on diesel (prepaid rates for these sales taxes: gasoline $0.0800/gal; diesel $0.4250/gal). Additional District sales taxes may apply. State Underground Storage Tank fee (all products): $0.02/gal. Oil Spill Prevention and Administration (OPSA) Fee (all products): $0.0990 per barrel ($0.0024/gal). Gasoline and diesel are also subject to costs associated with the Low Carbon Fuel Standard and Cap-and-Trade programs. Rate observed at the EIA reporting snapshot; verify legislative effective date. Federal tax included.
Excise Fixed diesel	USD 0.3100/L	2026-07-01	Open / check source	Verification pending TODO: reconcile sales-tax base and local levies before deriving. 2.25% state sales tax on gasoline, 13.00% state sales tax on diesel (prepaid rates for these sales taxes: gasoline $0.0800/gal; diesel $0.4250/gal). Additional District sales taxes may apply. State Underground Storage Tank fee (all products): $0.02/gal. Oil Spill Prevention and Administration (OPSA) Fee (all products): $0.0990 per barrel ($0.0024/gal). Gasoline and diesel are also subject to costs associated with the Low Carbon Fuel Standard and Cap-and-Trade programs. Rate observed at the EIA reporting snapshot; verify legislative effective date. Federal tax included.
Excise Fixed gasoline	USD 0.2360/L	2026-01-01	Open / check source	Verification pending TODO: reconcile sales-tax base and local levies before deriving. 2.25% state sales tax on gasoline, 13.00% state sales tax on diesel (prepaid rates for these sales taxes: gasoline $0.0750/gal; diesel $0.3850/gal). Additional District sales taxes may apply. State Underground Storage Tank fee (all products): $0.02/gal. Oil Spill Prevention and Administration (OPSA) Fee (all products): $0.0940 per barrel ($0.0022/gal). Gasoline and diesel are also subject to costs associated with the Low Carbon Fuel Standard and Cap-and-Trade programs. Rate observed at the EIA reporting snapshot; verify legislative effective date. Federal tax included.
Excise Fixed diesel	USD 0.2951/L	2026-01-01	Open / check source	Verification pending TODO: reconcile sales-tax base and local levies before deriving. 2.25% state sales tax on gasoline, 13.00% state sales tax on diesel (prepaid rates for these sales taxes: gasoline $0.0750/gal; diesel $0.3850/gal). Additional District sales taxes may apply. State Underground Storage Tank fee (all products): $0.02/gal. Oil Spill Prevention and Administration (OPSA) Fee (all products): $0.0940 per barrel ($0.0022/gal). Gasoline and diesel are also subject to costs associated with the Low Carbon Fuel Standard and Cap-and-Trade programs. Rate observed at the EIA reporting snapshot; verify legislative effective date. Federal tax included.
Excise Fixed gasoline	USD 0.2360/L	2025-07-01	Open / check source	Verification pending TODO: reconcile sales-tax base and local levies before deriving. 2.25% state sales tax on gasoline, 13.00% state sales tax on diesel (prepaid rates for these sales taxes: gasoline $0.0750/gal; diesel $0.3850/gal). Additional District sales taxes may apply. State Underground Storage Tank fee (all products): $0.02/gal. Oil Spill Prevention and Administration (OPSA) Fee (all products): $0.0940 per barrel ($0.0022/gal). Gasoline and diesel are also subject to costs associated with the Low Carbon Fuel Standard and Cap-and-Trade programs. Rate observed at the EIA reporting snapshot; verify legislative effective date. Federal tax included.
Excise Fixed diesel	USD 0.2951/L	2025-07-01	Open / check source	Verification pending TODO: reconcile sales-tax base and local levies before deriving. 2.25% state sales tax on gasoline, 13.00% state sales tax on diesel (prepaid rates for these sales taxes: gasoline $0.0750/gal; diesel $0.3850/gal). Additional District sales taxes may apply. State Underground Storage Tank fee (all products): $0.02/gal. Oil Spill Prevention and Administration (OPSA) Fee (all products): $0.0940 per barrel ($0.0022/gal). Gasoline and diesel are also subject to costs associated with the Low Carbon Fuel Standard and Cap-and-Trade programs. Rate observed at the EIA reporting snapshot; verify legislative effective date. Federal tax included.

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Common questions

Does a percentage tax stay fixed in cents per litre?

No. VAT, GST and sales taxes vary with their taxable base. For a tax-inclusive price and one rate r, the tax amount is price × r / (1 + r).

Why are some tax records marked unverified?

A published summary can omit a local levy, a tax-base rule or an effective date. Unverified records are not treated as a complete statutory tax stack.