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

Getting your VAT invoices right isn't just good bookkeeping. It's a legal requirement. HMRC can refuse input tax claims if the invoice doesn't meet their standards, and that means your customers lose out on reclaiming VAT. If you're a plumber, electrician, builder, or any other self-employed tradesperson who's VAT registered, this guide covers exactly what needs to go on your invoices in 2026.

Who needs to issue VAT invoices?

If your taxable turnover exceeds £90,000 in any rolling 12-month period, you must register for VAT. Once registered, you're legally required to 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.

There are some exceptions. 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 issue them anyway as good practice. If a customer asks for a VAT invoice, you must provide one regardless.

Voluntary registration

Even if your turnover is below £90,000, you can register voluntarily. This lets you reclaim VAT on tools, materials, and van costs. For tradespeople spending heavily on supplies, this often makes sense. A spark buying £3,000 worth of materials a month could reclaim £500 in VAT each month. That adds up quickly.

The three types of VAT invoice

HMRC recognises three types of VAT invoice, and the one you use depends on the value of the supply. 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 come in handy 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:

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:

• 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.

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

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.