What a UK Invoice Must Legally Include (VAT & Non-VAT)

Introduction

A UK invoice has to carry specific information to be legally valid and to satisfy HMRC. The exact requirements depend on whether you are VAT-registered, and there are three distinct invoice types — a full VAT invoice, a simplified VAT invoice, and an ordinary non-VAT invoice. This guide lists every required field for each, shows a sample layout, and points you to a free tool that includes them all by default.

This is a UK-specific deep dive. For a country-by-country comparison, see invoice requirements by country; for a general, non-country checklist, see what to include in an invoice.

Quick Answer: Every UK invoice must show a unique sequential invoice number, your name and address, the customer's name and address, the date (and tax point if different), a description of the goods or services with quantity and unit price, and the total due. If you are VAT-registered, add your VAT number, the VAT rate per line, the total VAT, and the net and gross totals. InvoiNova's free UK invoice generator includes every required field automatically.

The Core Fields Every UK Invoice Needs

Whether or not you are VAT-registered, a UK invoice must include:

1. The word "Invoice" clearly on the document
2. A unique, sequential invoice number (no gaps or duplicates — see invoice numbering)
3. Your business name and address (and trading name if you use one)
4. The customer's name and address
5. The invoice date
6. The tax point (date of supply) if it differs from the invoice date
7. A clear description of the goods or services supplied
8. The quantity and unit price of each item
9. The total amount due

It is also good practice — though not strictly mandatory — to include your payment terms, due date, and payment details (bank name, sort code, account number) so clients know how and when to pay. Late or unclear payment terms are a common cause of disputes; see invoice payment terms and handling late invoice payment.

The Three Types of UK Invoice

1. Non-VAT invoice (not VAT-registered)

If you are below the £90,000 VAT threshold and not voluntarily registered, you issue an ordinary invoice with just the core fields above. You must not show a VAT number or add a VAT line. The invoice is still fully valid, and you must keep a copy for your records. If you are approaching the threshold, read UK VAT registration for freelancers.

2. Full VAT invoice (VAT-registered)

If you are VAT-registered, most of your invoices must be full VAT invoices. In addition to the core fields, you must show:

• Your VAT registration number
• The VAT rate applied to each line (standard 20%, reduced 5%, or zero 0%)
• The total VAT charged
• The total excluding VAT (net) and the total including VAT (gross)
• A separate line per VAT rate if you mix rates on one invoice

3. Simplified VAT invoice (retail supplies ≤ £250)

For retail supplies of £250 or less, VAT-registered businesses may issue a simplified VAT invoice, which can omit the customer's details and some line-level breakdowns. It must still show your name and address, your VAT number, a description of the goods or services, the VAT rate, and the gross amount including VAT. Most freelance B2B work should still use a full VAT invoice so the client can reclaim correctly.

Sample UK VAT Invoice Layout

Here is a correctly structured full VAT invoice for a VAT-registered freelancer:

INVOICE
Invoice No.:  INV-2026-018
Date:         13 June 2026
Tax Point:    13 June 2026

From:
  A. Designer Ltd
  8 Studio Lane, Bristol BS1 4ST
  VAT No.: GB 987 654 321

To:
  Client Co Ltd
  22 Market Square, Leeds LS1 5AB

─────────────────────────────────────────────
Description                  Qty   Unit    Net
─────────────────────────────────────────────
Brand identity design         1   £2,400  £2,400.00
Logo files & handover         1     £300    £300.00
─────────────────────────────────────────────
Subtotal (excl. VAT):                  £2,700.00
VAT (20%):                               £540.00
─────────────────────────────────────────────
Total Due (incl. VAT):                 £3,240.00
─────────────────────────────────────────────

Payment terms: 30 days from invoice date
Bank: A. Designer Ltd | Sort Code: 00-00-00 | Account: 12345678

A non-VAT invoice is identical but with the VAT number and VAT line removed, and a single Total Due in place of the net/VAT/gross breakdown.

Reverse Charge and Special Cases

Some UK invoices need extra wording:

• Domestic reverse charge (construction): subcontractors in CIS-liable work between VAT-registered businesses do not charge VAT but must add the note "Reverse charge: VAT Act 1994 Section 55A applies." See the UK contractor & CIS invoice guide.
• Zero-rated or exempt supplies: show the 0% rate (zero-rated) or mark the supply exempt — they are treated differently for VAT but both must be shown clearly.
• Foreign-currency invoices: you may invoice in another currency, but if VAT applies you must also show the VAT amount in sterling.

Create a Compliant UK Invoice for Free

InvoiNova's free UK invoice generator includes every required field by default:

1. Open the UK invoice generator (or the UK freelancer tool).
2. Enter your business details and the customer's details — the invoice number is generated for you.
3. Add your line items with quantity and unit price.
4. If VAT-registered, set the VAT rate per line and add your VAT number in the custom fields; if not, switch on the no-tax mode so no VAT appears.
5. Add your payment terms and bank details in the custom fields.
6. Click Download PDF — you get a compliant UK invoice with the correct net, VAT, and gross breakdown.

Everything runs in your browser with no account, and your last 20 invoices are saved locally for your records — useful for Self Assessment and VAT returns.

Common UK Invoice Mistakes

• Gaps or duplicates in the invoice number — numbering must be sequential.
• Showing a VAT number while not registered, or charging VAT without one.
• Omitting the VAT rate per line on a full VAT invoice.
• Missing the tax point when it differs from the invoice date.
• No payment terms or bank details — slows payment and causes disputes.
• Forgetting the reverse-charge note on CIS construction invoices.

Get Every Field Right, Free

A UK invoice only needs a handful of fields — but missing one can delay payment or cause a VAT problem. InvoiNova's UK invoice generator includes them all, free and with no account, and produces a print-ready PDF in under two minutes.

Open the free UK invoice generator and create a fully compliant invoice today.