Every UK business that sends an invoice has to get certain details right by law. Miss one and a VAT-registered customer cannot reclaim the VAT. Get the numbering wrong and an HMRC inspection gets harder to sail through. This guide sets out exactly what a UK invoice must include, how the rules differ for sole traders, limited companies and VAT-registered businesses, and gives you a template you can copy today.
Quick Answer
A UK invoice must show a unique invoice number, the invoice date, your business name and address, your customer’s name and address, a clear description of the goods or services, the amount charged, and the total due. Limited companies must also show their full registered name, company number and registered office address. VAT-registered businesses must add their VAT number and show VAT as a separate line.
What Counts as an Invoice?
An invoice is a formal request for payment tied to goods or services already supplied. This matters more than it sounds. A quote, a pro forma, or a “payment received” receipt is not an invoice, and none of these should share the same numbering sequence as your real invoices. Keeping this distinction clean protects your business records and avoids confusion during a VAT check.
What Every UK Invoice Must Include
These details apply whatever your business structure:
- A unique invoice number, running in sequence with no gaps or repeats
- The date the invoice was issued
- Your business name, address and contact details
- The customer’s name and address
- A clear description of the goods or services supplied
- The quantity and price of each item
- The total amount due
Invoice Numbering: The Rule People Get Wrong
Your invoice numbers must run in a logical, unbroken sequence. You can use letters and prefixes, such as INV-2026-001, but you cannot repeat a number or skip one without explanation. If you cancel an invoice, keep its number retired in your records rather than reusing it. HMRC expects the sequence to be complete, and a visible gap is one of the first things a VAT inspection checks.
Sole Trader Invoice Requirements
If you trade as a sole trader, your invoice must show your own name, alongside any trading name you use. If you invoice under a business name, you must also give an address where legal documents can be sent to you, which does not have to be your home address if you use a different service address.
Limited Company Invoice Requirements
Under the Companies Act 2006, a limited company invoice must show your full registered company name exactly as it appears on your Certificate of Incorporation, your company registration number, and your registered office address. If you use a trading name that differs from your registered name, both should appear. Company director names are not a legal requirement, but if you choose to list one director, you must list them all.
VAT Invoice Requirements
If you and your customer are both VAT registered, a VAT invoice is a legal requirement for that transaction. A VAT invoice needs everything covered above, plus:
- Your VAT registration number
- The tax point, also called the supply date, which is when the goods or services were actually provided, and can differ from the invoice date
- The VAT rate applied to each item, whether standard, reduced, or zero rated
- The VAT amount shown as a separate line, not folded into the total
If you are still working out whether you need to register, our guide to VAT registration in the UK covers the current threshold and process in full.
Comparison Table: What Each Business Type Must Include
| Requirement | Sole Trader | Limited Company | VAT Registered |
|---|---|---|---|
| Unique invoice number | Required | Required | Required |
| Business name and address | Required | Required | Required |
| Company registration number | Not applicable | Required | Required if a company |
| Registered office address | Not applicable | Required | Required if a company |
| VAT number | Only if registered | Only if registered | Required |
| VAT shown separately | Only if registered | Only if registered | Required |
Payment Terms: What Happens If You Do Not State One?
You are not legally required to include a payment due date, though doing so is good practice and reduces disputes. If no payment term is agreed, the customer must pay within 30 days of receiving the invoice or the goods or services, whichever is later. If a payment runs late, UK law gives you the right to charge statutory interest and compensation, covered in full in our guide to late payment of commercial debts.
Do You Need to Include Bank Details?
Bank details are not a legal requirement, but in practice most customers will not pay without them. Include your account name, sort code and account number, or your preferred payment link, so payment is not held up by a follow-up email.
Can You Invoice in a Foreign Currency or Language?
Yes. Invoices can be issued in any currency or language. If you invoice in a currency other than pounds sterling, the total VAT payable must still be shown in pounds. If an invoice is issued in a language other than English, you must be able to provide an English translation within 30 days if HMRC asks for one.
A Simple UK Invoice Template
Use this structure as a starting point for your own invoices, adjusting the fields to match your business type.
| Field | Example |
|---|---|
| Invoice number | INV-2026-014 |
| Invoice date | 13 August 2026 |
| Supply date | 10 August 2026 |
| From | Your business name, address, contact details, company number if applicable |
| To | Customer name and address |
| Description | Consulting services, 5 hours at £80 per hour |
| Subtotal | £400.00 |
| VAT (20%) | £80.00 |
| Total due | £480.00 |
| Payment terms | Due within 30 days, bank details below |
How to Send and Record Invoices
Most small businesses now issue invoices through accounting software rather than a manual template, since it automatically numbers each invoice, tracks what is outstanding, and keeps a digital record for tax purposes. Whichever method you use, keep a copy of every invoice sent and received. Our guide to business record keeping requirements covers exactly how long to retain these, and our overview of bookkeeping services and pricing covers what a professional service typically costs if you would rather not manage this yourself.
Common Invoicing Mistakes
- Reusing an invoice number or leaving a gap in the sequence
- Missing the company registration number on a limited company invoice
- Folding VAT into the total instead of showing it as a separate line
- Confusing the invoice date with the supply date on a VAT invoice
- Sending a quote or pro forma using the main invoice number sequence
Frequently Asked Questions
What must a UK invoice legally include?
A unique invoice number, the invoice date, your business name and address, the customer’s name and address, a description of what was supplied, and the total amount due. Limited companies add their company number and registered office; VAT-registered businesses add their VAT number and show VAT separately.
Do I have to put a payment due date on an invoice?
No, but it is good practice. Without an agreed term, the customer must pay within 30 days of the invoice or the goods or services being supplied, whichever is later.
Can I skip an invoice number if I cancel an invoice?
No. Keep the cancelled number in your records and move on to the next number in sequence, rather than reusing it or leaving an unexplained gap.
Do sole traders need to show a company number on invoices?
No. A company registration number only applies to limited companies. Sole traders show their own name and business address instead.
Is an invoice legally binding?
An invoice is not a contract on its own, but a properly issued invoice is strong evidence that a contract existed and what its terms were, which matters if you ever need to pursue late payment.
Key Takeaways
- Every UK invoice needs a unique number, a date, business details, customer details, a description, and the total due
- Limited companies must add their registered name, company number and registered office address
- VAT-registered businesses must add their VAT number and show VAT as a separate line
- Without an agreed payment term, customers must pay within 30 days
- Keep every invoice on record and use a consistent, unbroken numbering sequence
About the Author
This guide was prepared by the Business Mine editorial team, who research and write practical UK business, tax and finance guides. Information is checked against current HMRC and Companies Act guidance at the time of publication. This article is provided for general information only and does not constitute legal or tax advice; for advice specific to your circumstances, consult a qualified accountant.
