Please remember that you must claim the state sales tax refund (TABOR refund) when filing your state income tax return. If you claimed a 2023 refund, the TABOR refund will be combined and issued out with your refund. Unlike the 2022 Colorado cashback, no separate check will be issued. 


Biodiesel & Blended Fuel Tax

Excise Tax Rates

Biodiesel fuel is a motor vehicle fuel produced from plant or animal products or wastes, as opposed to fossil fuel sources. Biodiesel is treated as a special fuel, and is subject to the fuel excise tax rate of $0.205 per gallon if it is clear, the Environmental Response Surcharge, and the Perfluoroalkyl and Polyfluoroalkyl substances (PFAS) fee. Biodiesel and blended fuel are subject to the Environmental Response Surcharge and the Perfluoroalkyl and Polyfluoroalkyl substances (PFAS) fee even if it is dyed. See the "Blended Fuel" section below for blending requirements of biodiesel.

Biodiesel is considered a clear special fuel because it can be used in vehicles without modification. As such, biodiesel is taxed at the special fuel rate of $0.205 per gallon unless it is exported out of Colorado, sold to a government entity, or blended with dyed special fuel. The environmental response surcharge and the Perfluoroalkyl and Polyfluoroalkyl substances (PFAS) fee also applies unless the biodiesel is exported out of Colorado, or sold to a railroad (PFAS not exempt for railroad).

Diesel Anti-Coagulate Additives

Additives to diesel are subject to fuel excise tax if the diesel fuel can be used to propel motor vehicles on public highways. When the additives are received, the receipt of those products should be reported on Schedule 2 as blending components, if the additive has a specific code, such as 076 for xylene or 199 for toluene, the specific code should be used.

Blended Fuel

If you are blending fuel types, the initial receipt of the fuel(s) should be reported on Schedule 2. The fuels to be blended should then be reported on Schedule 6 as a disbursement to yourself, with a mode of transportation of "BA" (book adjustment). Then the blended fuel should be reported on another Schedule 2 with the mode of transportation as "BA".

Licensed blenders can blend biodiesel with dyed petroleum diesel up to the maximum federal allowance after withdrawal from the terminal rack. Blenders must have a Colorado blending license and a federal blending permit.