Kerosene and heating fuels sit off to the side of the gasoline and diesel a jobber lives on. They carry the same dye-and-tax rules, plus a few of their own: two grades with different sulfur caps, a blocked-pump exception, and a large winter role as a diesel blendstock.
Two grades: K-1 and K-2
Kerosene is a light fuel oil used for heating, lamps, certain engines, and winter diesel blending. The ASTM D3699 spec splits it into two grades by sulfur. K-1 caps sulfur at 0.04 percent by weight and is the grade for unvented indoor heaters and wick lamps. K-2 allows up to 0.30 percent, roughly seven times more, and belongs in flue-connected burners that vent outdoors. In distribution each grade is its own product line, alongside heating oil.
Why some kerosene is dyed
Kerosene gets the same red dye as off-road diesel when it leaves the terminal for non-highway uses such as heating. The dye is the visible proof that no highway tax was collected on those gallons. Clear, taxed product can go anywhere. The mechanism mirrors dyed diesel exactly.
What misuse costs
Dyed kerosene and dyed diesel fall under the same federal penalty. Running dyed fuel on the road costs the greater of $1,000 or $10 per gallon involved, and the floor climbs by $1,000 with each prior violation, so a second offense starts at $2,000. That math is why sellers tie every untaxed gallon to a qualifying buyer, part of the broader fuel tax exemptions picture. Every grade and dye status is a separate product with its own tax treatment, which is the bookkeeping FastDragon handles for an added heating-fuel line.
How it is taxed
Undyed kerosene picks up the federal excise tax of 24.4 cents per gallon at the terminal rack: 24.3 cents plus the 0.1 cent LUST fee. Confirm current rates before quoting, since they can change, and state taxes stack on top. Dyed kerosene leaves untaxed for qualifying non-highway use. Kerosene also has one wrinkle diesel does not: the blocked pump. A seller registered with the IRS can dispense undyed kerosene for heating from a blocked pump, one physically set up so it cannot fuel a vehicle, and recover the tax on those gallons.
Kerosene in winter diesel
For many jobbers the biggest kerosene volume moves in winter, blended into No. 2 diesel to keep it flowing in the cold. The rule of thumb in the trade: each 10 percent of kerosene in the blend lowers the fuel's cold operability point by roughly 3 to 5 degrees Fahrenheit. Winter blends run from 10 percent kerosene up to 50 percent in hard climates. The blend gives up some energy content and lubricity in exchange for cold-weather reliability. Blends headed for the road are built from clear, taxed product.
Quick answers
Can you burn dyed kerosene in a home heater?
Yes. The red dye is a tax marker, and dyed kerosene burns the same as clear kerosene of the same grade. Heating qualifies as an off-highway use, so a kerosene heater or furnace can legally run on dyed product. The prohibition applies to vehicles on public roads.
Do I need an IRS registration to sell untaxed kerosene from a blocked pump?
Yes. The seller applies on IRS Form 637 under activity letter UP, the category for ultimate vendors selling kerosene from blocked pumps. Since the fuel was already taxed at the terminal, the registered vendor sells it at a tax-excluded price and recovers the tax through a claim such as Form 8849, Schedule 2.
Can a homeowner get the kerosene tax back?
Sometimes. The IRS allows a credit on Form 4136 for the federal tax paid on undyed kerosene a person bought at a taxed price and used at home for heating, lighting, or cooking. Kerosene bought from a blocked pump does not qualify, since that sale was already tax-excluded.
Is K-1 kerosene the same as No. 1 diesel or jet fuel?
They all come from the kerosene-range cut of crude, yet each sells against its own spec: K-1 meets ASTM D3699, jet fuel meets ASTM D1655, and No. 1 diesel meets ASTM D975. A load certified to one spec does not automatically pass the others, so distributors buy, test, and price them as separate products.