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Business Energy Glossary

What is VAT on business energy?

VAT on a business energy bill works the way VAT works on most things: it sits at the bottom, a percentage of everything above it. The catch is that “most things” doesn’t quite cover energy. There is a standard 20 per cent rate and a reduced 5 per cent rate, and the qualifying rules for the reduced rate trip up plenty of businesses every year. Care homes, charities, very low-use sites and mixed-use premises all have routes to the lower rate — and many never claim it. This entry covers VAT across both gas and electricity at the definitional level; for the electricity-specific rate breakdown, see the Clearsight VAT on business electricity article.

VAT touches every UK business electricity, business gas, and wider business energy invoice, with reduced-rate eligibility a small but useful exception worth knowing about.

VAT is one of the biggest single line items on a business energy bill, often adding 15 to 20 per cent to the total cost. For most businesses it is also one of the most easily overlooked: the rate looks predictable (20 per cent), but the qualifying criteria for the reduced 5 per cent rate catch out a meaningful minority of businesses every year. This entry focuses on what VAT applies, when each rate kicks in across both gas and electricity, and how the certificate process works.

What VAT applies to

VAT is a percentage tax applied to the supply of goods and services, including the supply of gas and electricity to non-domestic premises. The supplier collects VAT through the bill and pays HMRC. The customer's ability to recover the VAT depends on their own VAT registration: VAT-registered businesses making taxable supplies typically reclaim input VAT on energy bills.

VAT applies to the full bill total — not just the energy. That includes:

• Unit rate × kWh used.
• Standing charges.
• Climate Change Levy (CCL).
• Capacity charges (where applied).
• Any other pass-through policy costs shown on the bill.

The VAT line is the last line before the bill total, calculated on the subtotal of everything above.

The two rates: 20% and 5%

Two VAT rates apply to UK energy supplies:

The reduced rate is not new and is not a discount. It is a separate VAT rate written into UK VAT law (Schedule 7A of the VAT Act 1994). The customer's qualification under one of the categories above determines which rate applies.

Across both fuels, the rate structure is identical. Where the live VAT on business electricity article works through electricity-specific examples and HMRC notice 701/19 wording, this entry provides the cross-fuel definitional view.

The de minimis threshold

The de minimis rule treats very low consumption supplies as effectively domestic for VAT purposes. The thresholds are:

• Electricity: not more than 33 kWh per day (1,000 kWh per month, around 12,000 kWh per year).
• Gas: not more than 145 kWh per day (4,397 kWh per month, around 52,800 kWh per year).

Supplies below these thresholds automatically qualify for 5 per cent VAT and are also outside the scope of CCL. The supplier should apply the reduced rate without the customer needing to submit a certificate, though in practice it can be worth confirming with the supplier that the de minimis treatment is being applied to a low-consumption site.

Qualifying use

Beyond de minimis, the 5 per cent reduced rate applies to specific qualifying categories of use. The main categories:

• Domestic use. Energy used in a residence, including private dwellings, care homes, children's homes, hospices, certain types of student accommodation, monasteries, and similar.
• Charitable non-business use. Energy used in a charity's own non-trading activities. A charity running a trading subsidiary (shop, hire venue) pays 20 per cent on the trading element.
• Mixed-use premises. The qualifying portion of energy used for the categories above; the non-qualifying portion remains at 20 per cent.

The customer is responsible for asserting their qualifying use to the supplier. The default supplier treatment is 20 per cent until evidence is provided.

Mixed-use premises

Many UK businesses operate from premises that combine business and qualifying use. Examples:

• Pub with manager's flat above.
• Care home with administrative office.
• Church with hire space.
• Farm with farmhouse residence.

In these cases, the qualifying portion of the energy is at 5 per cent VAT and the trading portion at 20 per cent. The customer typically estimates the split (by floor area, by sub-meter, by usage pattern) and declares the percentage on the VAT certificate. The supplier then bills the split at the two rates, calculated on the same bill.

If the qualifying portion is 60 per cent or more of the total, HMRC concession allows the whole supply to be billed at 5 per cent without splitting. Below 60 per cent, the split must be calculated explicitly.

The VAT declaration certificate

To claim the 5 per cent rate, the customer submits a VAT certificate to the supplier. The standard forms:

• VAT 1166. The general declaration form used for qualifying use (de minimis, domestic, charitable).
• PP10 / PP11. Forms used for CCL purposes; often submitted alongside the VAT declaration as they relate to the same qualifying use.

The certificate states which category of qualifying use applies and (for mixed-use) the percentage qualifying. The supplier then adjusts the VAT (and removes CCL) for future bills.

Backdated relief is normally available for up to four years of bills, provided the qualifying use was genuinely the case for that historic period. This is an area where many businesses are owed material refunds without realising it.

How VAT appears on the bill

Standard UK business energy bills lay VAT out clearly:

1. List of charges: unit rate × kWh, standing charge × days, CCL × kWh, any other line items.
2. Subtotal of all the above.
3. VAT line: subtotal × VAT rate (5 or 20 per cent).
4. Total bill.

For a mixed-use bill, two VAT lines appear: one at 5 per cent for the qualifying portion, one at 20 per cent for the non-qualifying portion, with the subtotal split between the two.

Common pitfalls

• Charities paying 20 per cent on qualifying use. Many small charities default to the standard rate because they have not submitted a certificate. Reduction (and backdated refund) is available for up to four years.
• Care homes and HMOs. Often qualifying domestic supplies but billed at 20 per cent until certified. Common refund opportunity.
• Mixed-use premises under-claiming. The qualifying split is often higher than the customer realises (especially when floor area or sub-metering is reviewed).
• Trading subsidiaries of charities. The trading element remains at 20 per cent even where the parent charity qualifies. The split must be honest.
• Assuming the supplier handles it. Suppliers default to 20 per cent. The customer must assert qualifying use; the supplier will not proactively apply the reduced rate.

For an electricity-specific deep dive with worked HMRC examples, see the Clearsight VAT on business electricity article. Related glossary entries: Climate Change Levy, standing charge, bill validation.

VAT on business energy FAQs