VAT on the water you use

VAT on your clean water supply depends entirely on what your business does. HMRC decides it using the 1980 Standard Industrial Classification (SIC). If your main business activity falls within Divisions 1 to 5 of that 1980 list, you pay the standard rate of VAT, currently 20 per cent, on your water supply. Every other kind of business is zero-rated, which means no VAT is added at all.

Divisions 1 to 5 cover the heavier, industrial end of the economy:

• Energy and water supply industries.
• Mining, quarrying and extraction.
• Chemicals and metal manufacturing.
• Engineering and vehicle manufacturing.
• Other manufacturing, plus construction.

So a factory, chemical works or construction firm typically pays standard-rate VAT on its water, while an office, shop, school, café or care home does not.

VAT on wastewater is zero-rated for everyone

Here’s the part that catches people out: the sewerage and wastewater charges on your bill are zero-rated for everyone, whatever your industry. HMRC’s own guidance is clear that the reception, treatment and disposal of foul water and sewerage is zero-rated for industrial and non-industrial customers alike. So even a manufacturer paying standard-rate VAT on its clean water pays no VAT on the wastewater side, and that holds for trade effluent charged by volume and strength too.

One nuance is worth knowing. A few separate services do carry standard-rate VAT, because they sit outside the normal sewerage charge: unblocking or repairing drains, say, or emptying a cesspool or septic tank for an industrial user. The ordinary wastewater charge on a mains-connected bill isn’t one of them. If you can see VAT on your standard sewerage line, that’s still a red flag worth querying straight away.

VAT on each part of your bill

It helps to see the whole bill at once, because the parts are treated differently. Here’s how VAT applies to each line a business water bill can contain:

The pattern underneath is clear: only the clean water supply is ever affected by your industry, and only then if you sit in Divisions 1 to 5. Everything on the wastewater and drainage side is zero-rated for everyone.

The 1980 SIC divisions in full

HMRC splits the economy into ten divisions under the 1980 SIC, numbered 0 to 9. Divisions 1 to 5 are the industrial ones, and they’re the only businesses that pay VAT on their water supply. Everyone else, Divisions 0 and 6 to 9, is zero-rated:

So farming sits in Division 0 and pays no VAT on water, while a chemical works in Division 2 does. It’s the activity that counts, not whether a business feels industrial.

How the SIC code rule works

A few quirks are worth knowing about:

• It’s the 1980 classification, not today’s. HMRC still uses the 1980 SIC for this, so your modern SIC code doesn’t map across directly.
• Your largest activity decides it. If you run several sites or activities, the SIC code for your main business activity is applied to all of them.
• It’s about activity, not size. A small engineering workshop can be standard-rated while a large office is zero-rated.

One more thing worth understanding: if your business is VAT-registered and can reclaim its input VAT, being charged standard-rate water VAT in error is more of an admin headache than a real cost, because you recover it through your VAT return. It bites hardest where the VAT can’t be reclaimed, such as some charities, care homes, schools and financial services, where a wrong standard rating is money straight out the door.

If you only know your modern SIC code, here’s a rough guide: the standard-rated group lines up broadly with today’s Section B (mining and quarrying), Section C (manufacturing), Section D (electricity, gas and steam) and Section F (construction). It’s only an approximation, though, because HMRC works from the 1980 list, so the safe check is always the 1980 division your main activity falls under.

Worked examples

It’s easiest to see how this plays out with a few real cases:

• A manufacturer (Division 3 or 4). Pays standard-rate VAT on the water it uses, but zero VAT on its wastewater charges.
• An office, shop or restaurant (Division 6, 8 or 9). Zero-rated throughout, with no VAT on either water or wastewater.
• A farm (Division 0). Zero-rated, despite using a lot of water, because agriculture sits outside Divisions 1 to 5.
• A care home or school (Division 9). Zero-rated, and because these often can’t reclaim VAT, getting the classification right matters most of all here.
• A construction firm (Division 5). Standard-rate VAT on water at each site, with the largest-activity rule applying across them.

Zero-rated, not exempt (and never 5%)

A quick point that trips people up: where water carries no VAT, it’s zero-rated, not exempt. The difference is technical but real. Zero-rated is still a taxable supply, just at a rate of 0 per cent, whereas exempt sits outside VAT altogether.

And there’s no reduced 5 per cent rate for business water. People sometimes assume it works like domestic energy, which carries 5 per cent VAT. It doesn’t. Business water is either zero-rated or charged at the standard rate, with nothing in between.

How to check, and fix, your water VAT

It’s worth a five-minute check, because it’s a common error:

1. Look at your bill. Check whether VAT is being added, and to which part. Any VAT on the wastewater line is wrong.
2. Work out your 1980 SIC division. Decide whether your main activity sits inside Divisions 1 to 5 (industrial) or outside them.
3. Compare the two. If you’re being charged standard-rate VAT but your activity sits outside those divisions, you’re likely being over-charged.
4. Tell your retailer. Retailers use a VAT declaration form to set the right treatment, and submitting one corrects it going forward.
5. Reclaim the overpayment. Where VAT has been charged in error, you can usually recover it for past periods, up to four years back, in line with HMRC’s standard time limit.

If you’re VAT-registered you may be recovering this through your returns anyway, but where the VAT isn’t recoverable, or where wastewater has been wrongly charged, getting it right is real money. A business water audit picks this up as a matter of course, alongside your retailer and tariff.

Business water VAT FAQs

Related terms: Pence per cubic metre  ·  Water market deregulation