Red Diesel vs White Diesel Duty Calculator
Red diesel (rebated gas oil) attracts a much lower fuel duty rate than road diesel. From April 2022, eligibility was restricted. Calculate your potential duty saving if you qualify.
Frequently Asked Questions
What is red diesel and why is it cheaper?
Red diesel (rebated gas oil) is chemically identical to white road diesel but is dyed red to indicate it carries a lower fuel duty rate of 11.14p/litre vs 52.95p/litre for road diesel. The duty saving is approximately 41.81p per litre.
Who can still use red diesel after April 2022?
After the April 2022 restrictions, eligible users include: agriculture, horticulture, forestry, aquaculture/fish farming, non-road heating (boilers, generators), amateur sport, rail traction, and some other specified uses. Construction, mining, and quarrying lost eligibility.
Why did the government restrict red diesel in 2022?
The government restricted red diesel eligibility from 1 April 2022 as part of its net zero and environmental policies. Industries like construction were given the same fuel tax as road users to encourage switching to greener alternatives.
What are the penalties for misusing red diesel?
Using red diesel in non-qualifying vehicles or for non-qualifying purposes is an excise fraud. HMRC officers conduct roadside checks. Penalties include recovery of full duty, a £250 minimum penalty per litre, and potential prosecution.
Is there a red diesel equivalent for heating oil?
Heating oil (kerosene/28-second oil) used for domestic heating is a separate product from red diesel. It has its own rebated duty rate of 10.18p/litre and is only for space/water heating — not engines.
Can farmers use red diesel for road vehicles?
No. Agricultural vehicles travelling on public roads (including tractors) must use white road diesel for road journeys. They can use red diesel for off-road agricultural work. Dual-purpose vehicles require careful record-keeping.
How does HMRC detect red diesel use?
HMRC uses dip-testing at roadside checks and during investigations. The red dye (quinizarin) and a separate chemical marker are detectable even in small traces. Modern testing can detect contamination months after misuse.
Are there any alternatives to red diesel for construction?
Construction companies can use hydrotreated vegetable oil (HVO), which is treated as road diesel for duty purposes but is lower carbon. Some construction equipment manufacturers now support HVO operation.
What records must a red diesel user keep?
Records must include: purchase invoices, delivery notes, quantities used by activity type, vehicle/equipment identification, and confirmation of qualifying use. HMRC may request records going back 4 years.
Is VAT reclaimable on red diesel?
For VAT-registered businesses, input VAT is reclaimable on red diesel used for qualifying business purposes — the same rules as road diesel. The fuel duty rebate is separate from VAT recovery.
What is the current fuel duty rate for road diesel?
The road diesel (white diesel) fuel duty rate is 52.95p per litre, maintained since a temporary 5p/litre cut in March 2022 was made permanent in the 2024 Budget. VAT at 20% is charged on the total pump price including duty.
Is biodiesel eligible for the red diesel rate?
Pure biodiesel (FAME/RME) used in qualifying agricultural machinery can be used as red diesel. There are specific duty provisions for biofuels. HMRC publishes detailed guidance on biodiesel duty treatment.