A practical UK invoicing guide: what to include, how to number invoices and how to create a professional PDF invoice for free.
What is an invoice?
An invoice is a document requesting payment for goods or services. It gives the customer a record of the transaction and helps you track payments and business records.
What should a UK invoice include?
A standard invoice should clearly identify your business, your customer, the work or products supplied, the relevant dates and the amount due. The exact requirements depend on your business structure and whether you are VAT registered.
- ✓A unique invoice number and invoice date
- ✓Your business name, address and contact details
- ✓Your customer's name and address
- ✓A clear description of goods or services and their prices
- ✓The supply date (if different), total amount and any applicable VAT
- ✓Payment terms and instructions for paying
Example document
INVOICE
Example Plumbing Services
INV-001
Issued: 13 Nov 2026
Due: 27 Nov 2026
From
Example Plumbing Services
1 Example Street, Norwich
Bill to
Sample Customer
2 Sample Road, Norwich
| Description | Qty | Amount |
|---|---|---|
| Plumbing repair | 1 | £150.00 |
Illustrative example only — fictional details; no VAT charged in this example.
How to create an invoice step by step
Start with your business and customer details, then assign an invoice number you haven't used before. Add the items or services, check the amounts and enter your payment instructions.
Review the document before sending it. Make sure the customer's details are correct and that any VAT treatment reflects your registration status and the supply.
Do you need to charge VAT?
Not every business charges VAT. If you are not VAT registered, you generally should not add VAT to your invoices. VAT-registered businesses must follow the applicable VAT invoice rules, which may require additional information such as their VAT registration number.
Create your invoice as a PDF
A PDF keeps the layout consistent when you send an invoice by email. You can use RynovaSuite's free invoice generator to prepare and download an invoice without creating an account.
Frequently asked questions
Can I make an invoice without registering for VAT?
Yes. Businesses that are not VAT registered can issue invoices, but should not show VAT as charged.
Do invoice numbers have to be unique?
Yes. Use a unique identifier for each invoice so your records are easy to trace.
Can I send an invoice as a PDF?
Yes. PDF invoices are commonly used because the recipient can open and save the document without changing its layout.
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Enter your details and download a professional PDF using our free invoice generator.
Open invoice generator →General information only. Check current requirements and VAT treatment using official UK government guidance where applicable.