What must be on an invoice in Belgium?
An invoice is only in order when all the required details are on it. If something is missing, your client may not be able to deduct the VAT, or your invoice may be refused.
The required details
- The date of the invoice.
- A unique, sequential invoice number, without gaps.
- Your details: name, address and VAT number.
- Your client’s details: name, address and, if your client is a business, their VAT number.
- The date of delivery or service, if it differs from the invoice date.
- What you supply: description and quantity of the goods or services.
- The price: taxable amount per VAT rate, unit price excluding VAT and any discounts.
- The VAT: the rate and the VAT amount.
- A reason if you don’t charge VAT, for example reverse charge or the small business exemption.
Extra for companies
Invoices from a company also show the legal form, the address of the registered office, the enterprise number followed by “RPR” or “RPM”, and the court of the registered office. Ask your accountant what exactly applies to your business.
Not required, but useful
- A due date and your account number (IBAN).
- A structured payment reference, so payments are matched automatically.
What does Peppol change?
Since 1 January 2026, Belgian businesses must send their invoices to other Belgian businesses via Peppol. The required details stay the same, but they are now also included as structured data in the e-invoice. A Peppol invoice that is missing something required is often refused straight away.
How it works in Faktuno
Faktuno puts the required details on your invoice automatically and shows, before you send, what is still missing, for example your client’s VAT number.