How to write an invoice
A clear, professional invoice helps you get paid on time and keeps your records clean. This step-by-step guide covers exactly what to include, how to number your invoices, and the payment terms that reduce late payments.
1. Add your business and client details
Include your business name, address and contact details, plus the client's details and a unique invoice number for your records.
2. Itemise the work
List each product or service with a description, quantity, unit price and line total. Show the subtotal, any tax or discount, and the grand total clearly.
3. Set payment terms
State the due date (e.g. Net 14), accepted payment methods and any late-payment policy so expectations are clear.
Frequently asked questions
What should an invoice include?
An invoice should include your business and client details, a unique invoice number, an itemised list of products or services with prices, the total amount due, the due date, and accepted payment methods.
How do I number invoices?
Use a sequential, unique numbering system (for example INV-0001, INV-0002) so every invoice is easy to track and reconcile.