Title 26 › Subtitle Subtitle A— Income Taxes › Chapter 1— NORMAL TAXES AND SURTAXES › Subchapter A— Determination of Tax Liability › Part IV— CREDITS AGAINST TAX › Subpart D— Business Related Credits › § 45H
Small oil refiners can earn a tax credit of 5 cents for every gallon of low sulfur diesel fuel they make. Low sulfur diesel means diesel with a sulfur content of 15 parts per million or less. A refiner counts as small if no more than 1,500 people worked in its refining operations and its average daily refinery runs were 205,000 barrels or less for the year ending December 31, 2002. The total credit for a facility is capped at 25 percent of what the refiner spent to comply with EPA rules requiring cleaner highway diesel, and that percentage shrinks for refiners running more than 155,000 barrels a day. The credit covers costs paid during a window that began January 1, 2003 and ended no later than December 31, 2009, so it applies to that past compliance push rather than ongoing production spending. The refiner must get a government certification, within 30 months after the first year it claims the credit, that its spending will actually meet the EPA rules. Farmer and other co-ops can choose to pass their credit through to their members, and any refiner can elect not to take the credit for a given year.
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Internal Revenue Code — Source: USLM XML via OLRC
Legislative History
Reference
Citation
26 U.S.C. § 45H
Title 26 — Internal Revenue Code
Last Updated
Apr 6, 2026
Release point: 119-73