Business details
Include your business name, address, contact details and company/VAT details where relevant. If you are VAT registered, include your VAT number and VAT breakdown.
Invoice checklist
What should an invoice include?
A good invoice should make it obvious who is charging, who is paying, what was supplied, how much is due, when payment is due and how the customer should pay.
Invoice essentials
Include enough detail to get paid without back-and-forth.
For UK freelancers and small businesses, the invoice should be clear, numbered and easy to match to the job or purchase order. It should also be easy to track later so overdue payments do not disappear into email history.
Customer and job details
Add customer name, billing address, invoice number, issue date, due date, purchase order reference if used, and a short description of the work or goods supplied.
Payment details
Show line items, net total, VAT, gross total, amount already paid if relevant, payment terms and bank/payment instructions.
Invoice checklist
- Unique invoice number.
- Invoice date and due date.
- Your business and customer details.
- Clear description of goods or services.
- Net, VAT and total amount.
- Payment terms and payment method.
- Status tracking for sent, paid, part-paid or overdue.
Common mistakes
Avoid changing invoice numbers after sending. Do not forget due dates or payment instructions. Do not use vague line items like “services” if the customer needs detail to approve payment. Keep a tracker so you know which invoices are due, paid or overdue.
Practical tracking tip
Once an invoice has been sent, record it somewhere separate from your email inbox. A tracker makes it easier to see the total value outstanding, which customers are overdue, which invoices are part-paid, and which ones need a polite reminder. This is especially useful when you send only a few invoices a month and do not want to open accounting software every time you need a quick payment view.
Do invoices need unique numbers?
Yes, unique invoice numbers make records easier to manage and reduce confusion with customers and accountants.
Should I include VAT?
If your business is VAT registered, include VAT details and a VAT breakdown. If unsure, check HMRC guidance or ask an accountant.
How should I track sent invoices?
Use a tracker with invoice number, customer, issue date, due date, amount, paid amount, status and notes.