What Must Be Included on an Invoice in the UK? A Practical Checklist

A missing supply date, incomplete business details or unclear payment instructions can turn a routine payment into a long email exchange. Here is what a UK invoice must include, and what simply helps you get paid.

The details every UK invoice needs

According to GOV.UK, an invoice should include:

• A unique identification number, such as INV-2026-014
• Your business name, address and contact information
• The name and address of the customer you are invoicing
• A clear description of the goods or services supplied
• The date the goods or services were supplied
• The date the invoice was issued
• The amount being charged, with enough detail to understand the calculation
• The VAT amount, if VAT applies
• The total amount owed

The supply date and invoice date are not necessarily the same. You might finish a website update on 8 November and issue the invoice on 10 November. Both dates should be clear.

Extra details for sole traders

If you are a sole trader, include your own name as well as any trading name you use. If you trade under a business name, provide an address where legal documents can be delivered to you.

An invoice headed "North Lane Design" should therefore also identify the person trading under that name. A trading name on its own is not a substitute. You do not need to describe yourself as a limited company if you are not one, and you should not display a VAT registration number unless you are actually VAT-registered.

Extra details for limited companies

A limited company must show its full registered company name as it appears on its certificate of incorporation. GOV.UK also says that if you choose to name directors on an invoice, you must name all of them.

Company stationery, your website and other business documents have their own disclosure rules, which can differ from the invoice requirements, so check those too.

What changes if you are VAT-registered?

VAT-registered businesses have additional requirements when issuing VAT invoices. Depending on the transaction and invoice type, these can include your VAT registration number, the VAT rate, the tax point and the amounts excluding VAT.

HMRC sets different rules for full and simplified VAT invoices, so do not assume that adding "VAT 20%" to an ordinary invoice makes it compliant.

If you are not VAT-registered, do not charge VAT. You can still issue professional invoices, but you must not describe them as VAT invoices or imply that your customer can reclaim VAT from them.

A straightforward UK invoice example

The details below are fictional, and this is a non-VAT example. Alex Morgan, trading as North Lane Design, 12 Example Road, Brighton, BN1 1AA, invoices Harbour Studio Ltd, 8 Sample Street, London, EC1A 1AA. The invoice number is INV-2026-014, dated 10 November 2026. The work was supplied on 8 November 2026 and payment is due on 24 November 2026.

Payment is by bank transfer to the account shown on the invoice, quoting INV-2026-014 as the reference.

This example identifies both parties, describes the work, separates the supply and invoice dates, and makes the total clear. The payment instructions are not a substitute for the required information, but they save the customer from having to ask how to pay.

Details that make an invoice easier to pay

Consider adding these even when they are not mandatory for every invoice:

• A specific payment due date, not just "Net 14"
• A purchase order number if your customer uses one
• The relevant project name or period of work
• Bank details and the reference to use
• An email address for payment queries
• Any agreed deposit already received, shown separately from the balance due

If your customer needs a supplier number or purchase order to process an invoice, get it before the work is finished. A perfect-looking invoice can still be rejected by an accounts team if it cannot be matched to an approved purchase order.

Common invoice mistakes

• Using the same number twice. Each new invoice needs its own identifier, even if the work is similar.
• Forgetting the supply date, which is easy to miss when the invoice is issued days after the work.
• Writing vague descriptions. "Services rendered" tells the client very little; "Homepage design and two rounds of revisions, October 2026" is more useful.
• Adding VAT incorrectly. VAT depends on your registration status and the actual tax treatment of the supply, not on whether an invoice editor has a tax field.
• Leaving the due date ambiguous. "1 December 2026" is clearer than "01/12/26", especially for overseas clients.

Before you send: a final checklist

Check that the supplier and customer details are correct, the description matches the agreed work, the invoice number has not been used before, the relevant dates are present, any VAT treatment has been checked and the total matches your calculation. Finally, confirm the payment instructions and make sure the PDF itself is readable.

If you prepare invoices regularly, save the business details and use a consistent template rather than recreating the layout every time. Next Invoice includes client information, invoice numbering, templates and PDF export, so the recurring formatting is easier to manage.

A good invoice is not necessarily elaborate. It is accurate, recognisable and easy for the customer to approve and pay.