Red diesel fuel, also known as gas oil, remains an important fuel for farms, estates and approved commercial users across the UK. While it is similar to white diesel in how it powers engines and machinery, red diesel is marked with a dye and taxed differently.
For many businesses in agriculture horticulture and other permitted sectors, the red diesel price can have a direct impact on running costs. That is why it helps to understand what affects fuel prices, how red diesel differs from standard diesel, and when to order.
Red diesel fuel is a rebated fuel used in approved off-road vehicles, machinery and equipment. It is commonly used in tractors, agricultural machinery, generators and other eligible applications.
Barton Petroleum supplies red diesel to approved customers across the UK, with reliable delivery options for farms, rural businesses and commercial users.
The main difference between red diesel and white diesel is not performance. Both fuels can power diesel engines. The key difference is tax treatment and legal use.
White diesel is used in standard road vehicles. Red diesel, by contrast, has a lower fuel duty rate because it is restricted to specific uses. Since April 2022, the rules have become much tighter. Many sectors that previously used red diesel can no longer use it.
You can read the latest official guidance on eligible use from HMRC’s rebated fuel guidance.
Red diesel prices move for many of the same reasons as the wider diesel price. The cost of crude oil, refining, distribution, supply levels and seasonal demand can all affect what customers pay.
Fuel prices can change quickly. Global oil markets, exchange rates and supply chain pressure all play a role. When crude oil costs rise, gas oil prices often follow. When demand falls or supply improves, prices may ease.
For farmers, this can make budgeting difficult. Red diesel is often needed most during busy periods, such as harvest, when usage increases. Monitoring the market and planning deliveries in advance can help reduce the risk of buying at a peak.
For wider agricultural fuel trends, the AHDB fuel prices page offers useful market data.
In April 2022, the UK Government changed the rules on rebated fuels. This reduced the number of industries allowed to use red diesel. However, agriculture horticulture, forestry and fish farming remained among the key permitted sectors.
Using red diesel incorrectly can lead to penalties. Businesses should always check whether their vehicle, machine or activity qualifies before ordering gas oil. This is especially important for mixed-use businesses that may operate both on and off public roads.
Barton Petroleum’s guide, What Is Red Diesel Fuel and Who Can Use It?, explains eligible use in more detail and is a helpful next read for customers who want to stay compliant.
Fuel duty is one of the reasons red diesel is usually cheaper than white diesel. White diesel, used in road vehicles, is currently charged at 52.95p per litre in fuel duty. Red diesel, also known as gas oil, has a much lower duty rate because it is restricted to approved off-road uses.
From 15 June 2026 until 31 December 2026, the red diesel duty rate is being reduced from 10.18p per litre to 6.48p per litre. This temporary cut should help eligible users, including agriculture, horticulture and other approved sectors, manage rising fuel prices.
Although this duty reduction may help lower part of the cost, the final red diesel price will still depend on wider market conditions. Crude oil prices, supply levels, delivery costs and seasonal demand can all affect what customers pay.
While no business can control the market, there are ways to manage fuel spend. Ordering before peak demand, keeping tanks well maintained and tracking usage can all help.
A dependable supplier can also make a difference. Fast delivery, clear pricing and support with compliance help businesses avoid delays and unexpected costs.
Barton Petroleum has supplied fuels to rural and commercial customers for decades. Whether you need gas oil for agricultural machinery or regular fuel deliveries for your site, our team can help you plan ahead and keep your operation moving. View our red diesel page for more information.
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