How to Write an Invoice (UK): What to Include, with a Simple Checklist

Whether you're a freelancer, a sole trader or running a side hustle, a clear invoice helps you get paid faster. Here's what to include, and how to make sure you're paid on time.

What to include on an invoice

A basic UK invoice should include:

• The word "Invoice" clearly at the top
• A unique invoice number, usually in order, such as INV-001, INV-002
• Your name or business name, address and contact details
• Your customer's name and address
• The invoice date and the date of the work or delivery
• A clear description of the goods or services
• The amount for each item, and the total amount due
• Your payment terms, such as "payment within 30 days"
• How to pay you, such as your bank details

Extra details for limited companies

If you trade as a limited company, also include the full company name as it appears on the Companies House register, and the company's registered details.

Extra details if you're VAT registered

If you're registered for VAT, your invoices need extra information, including your VAT registration number, the VAT rate and the amount of VAT charged. Check GOV.UK for the full list.

Tips to get paid on time

• Agree terms before you start. Put your price and payment terms in writing.
• Invoice straight away when the work is done.
• Make it easy to pay. Include your bank details and a clear reference.
• Use simple software or a template, so every invoice looks professional and nothing is missed.
• Send a polite reminder on the due date if you haven't been paid.
• Know your rights. For business-to-business invoices, UK law lets you claim interest and compensation on late payments.

Common questions

Do I need a special invoice template?

No. Any clear document with the right details works. Many free templates and accounting apps can create invoices for you.

How long should payment terms be?

Many businesses use 14 or 30 days. If you don't agree terms, the law generally treats business payments as due after 30 days.

Can I charge interest on late payments?

For business-to-business sales, yes. The Late Payment of Commercial Debts rules let you claim interest and a fixed sum for late payment. Check GOV.UK for the current rates.

How long should I keep invoices?

Keep copies of your invoices and records. HMRC expects sole traders to keep records for at least 5 years after the 31 January tax return deadline.

Related guides

• How to Start a Side Hustle in the UK
• Self Assessment Tax Return Guide
• When and Why Is a Legal Notice Mandatory?

This guide is for general information only and is not legal or tax advice. Always check GOV.UK or speak to a qualified adviser.