Peppol is currently primarily used for invoicing government institutions, both at local and national level. This process is known as B2G (Business-to-Government) invoicing and is legally mandatory. So if you carry out government contracts for a municipality, city, or the Flemish or federal government, the invoice must be sent via the Peppol network. A simple PDF invoice by email is no longer sufficient or legally acceptable.
For B2B (Business-to-Business) invoicing, the use of Peppol is not yet mandatory, but that is about to change. From 1 January 2026, it will be mandatory to send every invoice to another company via the Peppol network.
This is an important change that will require companies to update their invoicing systems to comply with this new standard. This move towards mandatory use within B2B transactions will contribute to a standardized, more efficient method of electronic invoicing, reducing the chance of errors and increasing processing speed.
For invoicing to individuals, there are no changes; it remains permitted to send invoices in PDF format via email or by post. However, even for these transactions it can be useful to consider electronic invoicing, given the advantages it offers in terms of efficiency and traceability.
It is advisable for companies that have not yet joined Peppol to start preparing now for the upcoming changes, especially with the mandatory introduction for B2B invoicing in 2026. This will help you avoid future complications and ensure that your company continues to operate smoothly under the new regulations.
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