VAT invoice requirements UK 2026: what must appear on every invoice

Quick answer: A proper VAT invoice in the UK must show your VAT number, the date, a unique invoice number, your name and address, the customer's name and address, a description of goods or services, the quantity, the net amount, the VAT rate, and the total including VAT. For supplies under £250 (including VAT), a simplified invoice with fewer details is fine. The VAT registration threshold for 2025/26 is £90,000.

Getting your VAT invoices right isn't just about tidy bookkeeping. It's a legal necessity. HMRC won't accept input tax claims if the invoice doesn't meet their criteria, meaning your customers can't reclaim VAT. If you're a plumber, electrician, builder, or another self-employed tradesperson who's VAT registered, here's what your invoices must include in 2026.

Who needs to issue VAT invoices?

If your taxable turnover goes over £90,000 in any rolling 12-month period, you must register for VAT. Once registered, you must issue VAT invoices for most supplies to other VAT-registered businesses. You must issue a VAT invoice within 30 days of the date of supply, or the date of payment if earlier.

Quick takeaway: If your business turnover exceeds £90,000, you're required to register for VAT and issue VAT invoices to other VAT-registered businesses.

Some exceptions exist. You don't need to issue a VAT invoice for exempt supplies or if you're selling to non-VAT-registered customers, though many tradespeople do so as good practice. If a customer requests a VAT invoice, you must provide one.

Worth pairing this with flat rate VAT scheme for trades.

Voluntary registration

Even if your turnover is below £90,000, you can register voluntarily. This allows you to reclaim VAT on tools, materials, and van costs. For tradespeople with high supply costs, this often makes sense. An electrician purchasing £3,000 worth of materials monthly could reclaim £500 in VAT each month. That quickly adds up.

The three types of VAT invoice

HMRC recognises several types of VAT invoice, and the one you use depends on the supply's value. Here's how they break down:

Most tradespeople will use full VAT invoices for the majority of their work. A bathroom refit at £4,800 plus VAT, a rewire at £3,200 plus VAT, these all need full invoices. Simplified invoices are useful for smaller call-out jobs or minor repairs under £250.

What must appear on a full VAT invoice

A full VAT invoice must include all of the following. Miss any of these and HMRC can challenge the invoice, which causes problems for your customers trying to reclaim VAT.

1. Your business name and address (or trading name if different from the registered name)

2. Your VAT registration number

3. A unique, sequential invoice number. This must follow a pattern. You can't skip numbers or repeat them.

4. The invoice date (also known as the tax point or date of supply)

5. The date of supply if different from the invoice date. For a boiler install completed on 5 March but invoiced on 10 March, both dates must appear.

6. The customer's name and address

7. A description of the goods or services. "Plumbing work" is too vague. "Installation of combination boiler and 3 radiators, first-floor flat, 42 Oak Lane" is better.

8. The quantity of goods or extent of services

9. The unit price excluding VAT (or including VAT if using modified invoices)

10. The total net amount (excluding VAT)

11. The VAT rate applied to each item. If you're charging standard rate (20%) on labour and reduced rate (5%) on energy-saving materials, each must be shown separately.

12. The total VAT amount

Common mistakes tradespeople make

In my experience, the most common errors are:

• Missing or incorrect VAT numbers. Always double-check your own VAT number. Transposing two digits invalidates the invoice.

• Vague descriptions. "Works carried out" tells HMRC nothing. Be specific about what you did, where, and what materials you used.

• Forgetting the date of supply. If you finished a job on Friday but raised the invoice on Monday, you need both dates.

• No sequential invoice numbers. Using random reference codes instead of a proper numbering system is a red flag for HMRC.

Using invoicing software like InvoiceAdept's free invoice generator takes care of sequential numbering and required fields automatically. That removes most of the risk.

Simplified VAT invoices explained

For supplies totalling £250 or less (including VAT), you can issue a simplified invoice. This is useful for smaller jobs like a call-out fee to fix a leaking tap or a minor electrical repair.

A simplified VAT invoice needs:

• Your business name and address

• Your VAT registration number

• The invoice date

• A description of the goods or services

• The total amount including VAT

• The VAT rate

Notice what's missing: you don't need the customer's name and address, a unique invoice number, or a breakdown of net and VAT amounts. That said, including them anyway is good practice, especially if the customer is VAT-registered and wants to reclaim input tax.

VAT rates for tradespeople in 2026

Most of your work will fall under the standard 20% rate. But there are exceptions worth knowing about:

Pro tip: In 2026, the standard VAT rate remains 20%, but check if your services qualify for the reduced 5% rate, especially in energy-efficient installations.

The 5% reduced rate on energy-saving materials has been a significant benefit since it was expanded. If you're installing loft insulation, cavity wall insulation, or heat pumps in homes, make sure you're applying the right rate. Getting this wrong means either overcharging your customer or underpaying HMRC.

Use the free VAT calculator to quickly work out the correct VAT amounts for mixed-rate invoices.

The tax point: when does VAT become due?

The tax point matters because it determines which VAT return a transaction falls into. For most tradespeople, the basic tax point is the date you finish the job. But it gets more nuanced:

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• If you invoice before completing the work, the invoice date becomes the tax point.

• If the customer pays before you invoice, the payment date is the tax point.

• If you invoice within 14 days of completing the work, the invoice date becomes the tax point.

For a tradesperson working on a kitchen refit over three weeks, the basic tax point is when you hand over the completed kitchen. If you raise your invoice two days later, that invoice date becomes the actual tax point. Simple enough. But if the customer paid a £2,000 deposit before work started, that deposit has its own tax point on the date it was received.

Deposits and stage payments

Many tradespeople take deposits or bill in stages for larger projects. Each payment triggers its own tax point. If you take a £1,500 deposit on 1 March, bill £3,000 at first fix on 15 March, and the final £2,500 on completion on 30 March, you need to account for VAT on each payment at the time it's received or invoiced.

This is where invoicing software really earns its keep. Manually tracking tax points across multiple stage payments for several jobs at once is a recipe for errors. InvoiceAdept handles this automatically, applying the correct tax point to each invoice.

Record keeping requirements

HMRC requires you to keep copies of all VAT invoices you issue and receive for six years. Since April 2022, Making Tax Digital (MTD) rules mean most VAT-registered businesses must keep digital records and submit VAT returns using compatible software.

Your records must include:

• All sales and purchase invoices

• Your VAT account (showing VAT charged and VAT paid)

• Credit notes and debit notes

• Records of any goods or services you used for non-business purposes

For more on late payment issues, the late payment interest calculator can help you work out what you're owed if customers don't pay on time.

CIS and VAT: what subcontractors need to know

If you work as a subcontractor in construction, CIS (Construction Industry Scheme) deductions interact with your VAT invoices. The contractor deducts CIS tax from the labour portion of your invoice, but VAT is calculated on the full amount before CIS deductions.

Common mistake: Not providing a VAT invoice when requested by a customer can lead to compliance issues and dissatisfied clients.

Here's an example. You invoice a contractor for £1,000 labour plus £200 materials:

• Net amount: £1,200

• VAT at 20%: £240

• Gross invoice: £1,440

• CIS deduction at 20% (on labour only): £200

• Amount the contractor pays you: £1,240

Your VAT invoice should show the full amounts. The CIS deduction is a separate matter between you and the contractor. Use the CIS deduction calculator to check your figures before invoicing.

For full guidance, see HMRC's VAT record keeping guide and VAT Notice 700.

Frequently asked questions

Do I need to put my VAT number on every invoice?

Yes. Every VAT invoice, whether full or simplified, must include your VAT registration number. Issuing invoices without it is a legal requirement once you're VAT registered, and your customers need it to reclaim input tax.

Related: VAT registration for tradespeople.

Can I issue a VAT invoice if I'm not VAT registered?

No. Showing VAT on an invoice when you're not registered is illegal. You'd be collecting tax you have no authority to collect. If your turnover is below £90,000 and you're not voluntarily registered, do not include VAT on your invoices.

If you need the paperwork side too, see our guide to when to register for VAT.

What happens if I make a mistake on a VAT invoice?

You cannot simply alter a VAT invoice once it's been issued. Instead, you must issue a credit note to cancel the original invoice, then raise a new corrected invoice. The credit note must reference the original invoice number and clearly state what's being corrected.

How long do I have to issue a VAT invoice?

You must issue a VAT invoice within 30 days of the date of supply, or the date of payment if earlier. Missing this deadline doesn't exempt you from the obligation, but consistently late invoicing can attract attention from HMRC.

Do I charge VAT on materials I buy and pass on to the customer?

Yes. If you buy materials and supply them as part of your service, you charge VAT on the full amount including materials. You reclaim the VAT you paid on those materials through your VAT return, so you're not paying VAT twice.

For the tax angle, read domestic reverse charge VAT.

Get your VAT invoices right, every time

VAT invoicing doesn't have to be complicated. The rules are clear, and once you've set up a good template with all the required fields, it becomes second nature. If you're tired of worrying about whether your invoices meet HMRC's standards, InvoiceAdept generates fully compliant VAT invoices with all 12 required fields filled in automatically. Create your first invoice free at /tools/invoice-generator/ and stop second-guessing your paperwork.