Here you will find frequently asked questions about e-invoicing in Belgium, grouped by theme. Since 1 January 2026, e-invoicing between Belgian businesses is mandatory. The Federal Public Service Finance publishes an extensive FAQ. We therefore explain the key questions in plain language, with references to the book and to our free tools.
Looking for answers about the book itself, such as ordering, delivery or training? Read the questions about the book.
Frequently asked questions about e-invoicing by theme
- E-invoicing between businesses (B2B): frequently asked questionsSince 2026, VAT-registered businesses in Belgium send each other structured e-invoices, and a PDF no longer counts as an invoice.
- E-invoices to the government (B2G): frequently asked questionsYou invoice a Belgian public body via Peppol, after which Mercurius forwards the invoice to the right authority.
- Storing e-invoices: frequently asked questionsKeep the XML invoice for ten years, in a way that guarantees its authenticity, integrity and legibility.
- What is Peppol? Frequently asked questions about Peppol in BelgiumPeppol is the network e-invoices travel on, and you join it through a service provider, usually under your company number.
- Credit notes and other specific e-invoicing situationsA credit note follows the same format as the invoice, and a business that cannot send or receive e-invoices risks a fine.
- E-reporting 2028: frequently asked questionsE-reporting does not apply yet: the government plans to start it on 1 January 2028, but Parliament still has to pass the law.
How we write these answers
Every answer starts from the official FAQ of the Federal Public Service Finance on efactuur.belgium.be. Moreover, each page names its source, because the official text always prevails. Looking for the technical side of an error message? Then see the Peppol error codes. To check an invoice, however, use the e-invoice validator. Not sure about a term, such as Access Point or Peppol ID? In that case, our Peppol glossary helps.
Is it mandatory for me? Take the test
First, answer a few short questions. Then find out what the obligation means for your business.