What is the VAT rate on business water bills?

If you run a business, understanding what you’re paying for on your water bill isn’t always straightforward. One question we’re often asked is: what is the VAT rate on business water bills? In most cases, business water and wastewater services are subject to the standard 20% VAT rate, although the treatment can vary depending on the type of charge on your bill. You can find further guidance on VAT rates on the GOV.UK website.

In this guide, we’ll explain what VAT rate applies to business water bills, how VAT is treated across different water and wastewater charges, and what businesses should look out for when checking their bills.

What is the VAT rate on business water bills - 0% or 20%

The table below gives an overview of the VAT rate commonly associated with different types of businesses and organisations. If your business type is not listed below and you would like to discuss your business water VAT rate, please contact one of our business energy consultants today.

Why do some Businesses pay VAT on their water bills when others don't?

It can sometimes come as a surprise, but most businesses are zero rated when it comes to paying VAT on water bills. For those businesses in the position of paying VAT, it can be worthwhile to take the time an check the charge should actually be there.

Here are some reasons why some business pay VAT whilst others don't:

HMRC Rules

Water supplied to a business is zero-rated for VAT by default. The exception is when HMRC considers the business to be carrying out what it calls a "relevant industrial activity." If that applies, the potable or clean water element of the bill has the standard rate of 20% VAT applied. Waste water and surface drainage do not fall under this exception and are always rated 0 for VAT.

Industrial vs Non-Industrial

The industrial or non-industrial classification is based on the customer's primary business activity and is applied across the company as a whole rather than being site specific based on usage. For example a manufacturing firm's head office is still classed as industrial, even if the water there is only ever used to make tea, because the classification follows the business, not the tap.

SIC Codes

That classification comes from the business's SIC code, its Standard Industrial Classification, a short code that describes the primary trade or activity a company is registered as carrying out as recorded by Companies. It is this information a company’s water supplier will rely on to decide how a bill should be treated for VAT purposes. We go into more detail about SIC codes below.

Retailer Obligations

As with any industry, water retailers are legally required to charge VAT correctly, and that puts the burden of getting the classification right on them. In practice, that means asking customers to confirm their SIC code or checking against companies house. If a business hasn't provided their SIC code there a risk retailers may apply VAT by default as a safeguard rather than risk under-charging; furthermore, an out of date CIC code can have the same effect. In any case, it's a sensible rule for the supplier, but it also means a business can end up paying VAT it doesn't actually owe simply because its classification was never confirmed or has gone out of date.

What is a SIC code?

A Standard Industrial Classification, or SIC code is a five-digit code that describes the main economic activity a company carries out. There are more than 600 codes spread across 21 industrial categories, covering everything from farming to financial services. Every UK limited company must choose at least one but are allowed up to a maximum of four.

Why do suppliers ask for a SIC code?

For a utility supplier and especially a water supplier, a SIC code is the fastest way to establish what kind of business they're dealing with. It's not a formality an incorrect code can affect the rate a business is charged.

How do SIC codes affects VAT

This matters most for business water. HMRC still works from the 1980 version of the SIC code list to decide whether a business is carrying out a "relevant industrial activity," and if it does, its water is charged at the standard rate of 20% rather than zero-rated like most other businesses. 

Businesses With Multiple SIC Codes

Companies House allows up to four SIC codes per company, which covers businesses that genuinely do more than one thing. For example it is quite possible a company may both manufacture and retail a product. Close attention should be paid to the order in which they are listed however, as the first code is considered the primary business activity and this is the one used to determine if VAT is paid on business water bills.

Primary Business Activity

Where SIC codes for more than one activity are listed on companies house, HMRC doesn't consider secondary activities. It looks exclusively at the primary activity only and applies whichever VAT treatment matches that single activity to the whole supply. Getting a SIC code registered accurately, and keeping it that way, isn't just paperwork, it can be the difference between paying VAT and not. Checking a client's classification, and challenging an incorrect charge where one's been applied, is part of the same billing and supplier management support we provide across all their utilities.

How to check whether you're paying the correct VAT on your water bill

If you have any concerns over your business water VAT rate, it's worth making a quick check rather than assuming your bill is right.

1. Find your latest bill. Pull up the most recent invoice from your water retailer so you've got the actual figures in front of you.

2. Identify the VAT charged. Check whether VAT has been added, and at what rate, it should be clearly itemised on the bill with the Potable Water charge.

3. Check your SIC code. Confirm which SIC code is registered against your business on Companies House and ensure it reflects your main business activity.

4. Contact your retailer. Ask them directly how your VAT treatment was determined and which classification they've applied.

5. Request a review. If the classification looks wrong, or hasn't been confirmed in a while, ask your retailer to formally review it.

6. Compare your tariff. While you're checking, it's worth comparing your wider tariff too, an incorrect VAT rate is often a sign nobody's looked closely at the account in a while.

Going through all six steps takes time most business owners don't have, and retailers can be difficult to contact and aren't always quick to revisit a classification once it's set. Talking to Clear Utility Solutions means we run this check on a client's behalf: pulling the bill, confirming the SIC code that's actually registered, and querying it with the retailer directly if something doesn't look right. Where we find VAT has been charged incorrectly, we'll push for it to be corrected and, where possible, backdated, and we'll fold that same check into the wider comparison and billing support we already provide, so it's one less thing to keep on top of.

Can switching business water supplier reduce your costs?

Since the deregulation of the water market in the UK, businesses have been free to choose who handles their water retail services, bringing choice, competition and a wider range of products to water consumers.

It is important to note the water wholesaler, the company responsible for the delivery of potable water, treating of wastewater, and maintaining the network, remains the same and cannot be changed. What you're switching is the retailer: the company that bills you, manages your account, and sets its own margin on top of the wholesale charges. That's where potential savings can be made.

Unit Rates

Retailers set their own margin on top of the fixed wholesale rate, and that margin varies. A business sitting on a default or unreviewed tariff is often paying more than it needs to simply because nobody's negotiated it down, switching, or even just renegotiating with the current retailer, can bring the unit rate back in line with the market.

Standing Charges

The same can apply to standing charges. These cover the retailer's own costs of managing the account rather than the wholesaler's infrastructure costs, so they aren't fixed in the way people sometimes assume. A cheaper standing charge, or an account structure that suits how the business actually operates, can make a real difference over a full year.

Retail Fee

Some retailers prefer to ‘pass through’ the wholesale charges at cost and instead charge a retail fee for their services. This is shown as a separate line on the bill and is usually the fairest most transparent method of charging.

Billing Accuracy

Billing errors are common, especially where a business has multiple sites and multiple invoices to reconcile. A retailer that consolidates billing across sites, reads meters accurately, and corrects mistakes quickly saves time and money that would otherwise go into chasing and checking bills. Furthermore contract end dates can be consolidated to simplify renewal and maximise potential discounts.

Leak Support

Leaks can be expensive, and retailers often differ in how proactively they support customers with leak detection, meter monitoring, and leak allowance claims, which can offset charges for water lost through an undetected leak. A retailer that flags unusual usage early can catch a leak before it turns into a very large bill.

Account Management

Beyond the numbers, the quality of account management also varies significantly between retailers. Multi-site businesses in particular benefit from dealing with one point of contact instead of several, and a retailer that's responsive when something needs sorting saves the kind of time that's hard to put a figure on but can soon add up.

Aside from the obvious fact that a smaller bill will mean less VAT to pay there, is little that can be done to reduce the VAT on your business water bill. Taken together though, unit rates, standing charges, accurate billing, leak support, and proper account management can still add up to a meaningful reduction in what a business pays for water.

How can Clear Utility Solutions help?

Comparing business water retailers and managing that switch is part of the same procurement support we provide across a client's utilities, so if it's been a while since your water account was reviewed, it's worth having us take a look. Visit our dedicated business water page or contact us now to request a custom quote for your business.