Where to Buy Red Diesel: Farm Suppliers, Checks and Rules

Where to buy red diesel

If you have typed “where buy red diesel” into a search bar, the short answer is this: from a fuel dealer approved by HMRC under the Registered Dealers in Controlled Oil (RDCO) scheme, and only if the fuel is going into a machine and a job the rules allow. For a farm, that means a bulk delivery from an approved fuel distributor or agricultural merchant into your own tank, or collecting from a distributor’s yard pump or a forecourt that sells it.

The dealer side is not optional. HMRC’s RDCO guidance states: “Under this scheme, anyone intending to sell or deal in controlled oils must be approved to do so.” Red diesel is marked rebated gas oil, and the scheme covers it along with marked kerosene and HVO sold as red.

The buyer side matters just as much. Being able to get hold of red diesel does not make it legal to burn it. What you put it in, and what that machine is doing, decides whether you owe full duty.

The main ways farms buy it

• Bulk delivery to a farm tank. This is how most farms buy. You open an account with an approved distributor, they deliver by tanker and you pay per litre plus VAT. Ringing two or three local distributors for a price on the same day is still the simplest way to keep them honest, because prices move weekly.
• Distributor yard or forecourt pump. Some distributors and rural forecourts sell red from a pump. HMRC’s record-keeping rules treat these as their own category: “Forecourt, distributor yard or other supplies made through pump or similar dispenser not exceeding 100 litres.” That suits a quad, a small loader or a hedge-cutter running low between deliveries.
• Small cans. A seller is outside the RDCO scheme if it is willing to “receive and sell any of the controlled oils only in pre-packaged containers not exceeding 20 litres”. That is why you sometimes see small cans of red at builders’ merchants or garden machinery dealers. It is the dearest way to buy, and the rules on use still apply to you.
• Buying groups and machinery rings. If you belong to one, ask whether it negotiates fuel for members before you go to the open market.

Whatever the route, the supplier needs somewhere safe to put the fuel. Check the tank is sound and bunded before the first delivery. In England, fuel stored on farms comes under the same regulations as slurry and silage. Our guide to slurry, silage and SSAFO regulations covers the storage side.

What a supplier will ask you

An approved dealer is legally on the hook for where its red diesel ends up, so expect questions. The dealer guidance says: “You must carry out appropriate checks on all your customers and be accountable for all of your supplies to them.” In practice that means your name, contact details, delivery address and what you use the fuel for.

For a new account, the dealer also needs your VAT number and the delivery postcode. HMRC expects a dealer to have a new customer’s VAT number by the third delivery, or sooner where deliveries are few and far between. If you are not VAT registered, the dealer simply notes that.

Dealers have good reason to be careful. If they supply someone they have reason to think will misuse the fuel, HMRC says: “This may include financial penalty up to 100% of the duty evaded and revocation of your RDCO approval.”

A seller who asks nothing at all, wants cash, and has no paperwork is a warning sign, not a bargain. Ask any new supplier for their RDCO approval number before the first delivery. Keep that number with your delivery notes. Fuel quality is worth thinking about too: our report on diesel fraud in the agri supply chain shows what happens when it goes wrong.

What you can legally put it in

Red diesel can only go into what HMRC calls excepted machines, and only while they are doing qualifying work. HMRC’s guidance on fuels for use in vehicles is clear: “Any vehicle or machine that is not an excepted machine cannot use rebated fuel.”

For farms, the qualifying work is agriculture, horticulture, aquatic farming and forestry. The agricultural vehicles that qualify include:

• a tractor
• “a single-seat vehicle of no more than 1,000kg that is designed and constructed mainly for off-road use”, which covers most quads
• a vehicle used only for agricultural, horticultural or forestry purposes and licensed to use public roads only when passing between two areas of land occupied by the same person, provided they are less than 1.5 kilometres apart by road
• a vehicle with built-in machinery for handling or processing farm produce or materials, such as a combine harvester, crop sprayer or forage harvester

The farm pickup is not on that list. The notice says: “Vehicles designed mainly for carrying goods, produce, and implements are trucks.” A pickup or lorry runs on white diesel, whatever it is carrying.

Contractors doing farm work for you can use red in their kit for that work. A tractor that leaves the farm to do non-agricultural commercial work, such as a groundworks or construction job, needs white diesel for that work. The notice tells you to “flush out the fuel tank to remove all traces of rebated fuel when switching uses”. Roadside hedge and verge cutting, and clearing snow, ice or flooding, are allowed in an agricultural vehicle.

What it costs, and the VAT

The duty on red is a fraction of the full diesel rate, and it is lower than usual this year. According to HMRC’s hydrocarbon oil duty rates, a further temporary cut to the duty on marked gas oil runs from 15 June 2026 to 31 December 2026, cutting it from 10.18p to 6.48p a litre. White diesel pays 52.95p a litre. The pump or delivered price on top of that depends on the wholesale market, the size of the drop and how far the tanker travels. Our red diesel prices page tracks what a litre costs.

VAT depends on the size of the delivery. Under HMRC’s fuel and power VAT notice, “all supplies of not more than 2,300 litres of fuel oil, gas oil or kerosene are subject to the reduced rate regardless of use”. Bigger drops for farm machinery are normally charged at the standard rate, which a VAT-registered farm reclaims in the usual way. If your farmhouse heating runs off the same tank, tell the supplier, because heating your home can count as a qualifying domestic use.

If you get it wrong

HMRC officers have the legal power to check, sample and test the fuel in vehicles, machines and storage tanks, and the consequences fall on the user, not just the seller. HMRC’s vehicle fuels guidance says: “We will seize any vehicle, vessel, machine, or appliance that is using rebated fuel when it is not allowed to.” You can be assessed for “the fuel duty evaded, going back up to 4 years”, plus a penalty on top.

Deliberate misuse is a criminal matter: “The offender can be fined an unlimited amount or imprisoned for up to 7 years, or both.”

Mixing is the easy mistake to make on a busy farm. The rule is: “You must not mix these fuels in any tank, or in the fuel system of any vessel or machine not allowed to use rebated fuel.” Keep red and white in separate, clearly labelled tanks, keep the bowser for one or the other, and keep your delivery notes so you can show what came in and where it went.