Peppol in Belgium: the 6-month review after the mandate
More than one million Belgian companies on Peppol by spring 2026: mass adoption, regional gaps, and key lessons for late adopters.
· Updated: · Reading time: 5 min
January 1st, 2026 is behind us. Six months later, the key question is: what is the real outcome of Belgium's most ambitious invoicing reform? Official figures are now available. They show strong adoption, persistent regional disparities, and practical lessons for companies still running behind.
A spectacular take-off: the hockey-stick effect
Analysts predicted it, and it happened: invoice traffic through Peppol followed a clear hockey-stick curve. Growth stayed modest until summer 2025, then accelerated sharply in the final weeks before the deadline.
In only three months, volume increased by more than nine times. Official Belgian business figures show that over one million companies were connected by early 2026, with adoption above 83% in Flanders and Wallonia.
- 2.7 million Peppol invoices exchanged in October 2025
- 25 million Peppol invoices exchanged in January 2026
Regional disparities: Brussels and Wallonia lag behind
Despite strong overall adoption, data still reveals meaningful regional gaps. Most Peppol registrations are concentrated in Flanders, while Brussels and Wallonia remain comparatively lower. This remains a key challenge for regional stakeholders.
Belgian authorities are targeting roughly 90% registered businesses, or around 1.1 million entities. In practice, this means a smaller but still significant share of companies remains to be connected.
The most common field mistake
The main barrier is often organizational rather than technical: many companies still confuse a PDF sent by email with a truly compliant structured e-invoice.
A PDF, even when sent digitally, does not meet legal requirements since January 1st, 2026. Invoices must be transmitted through the Peppol network in a machine-readable format (UBL XML), aligned with EN 16931.
Positive signal: 100,000 voluntary businesses
Another strong signal is that more than 100,000 non-VAT-liable entities joined Peppol voluntarily. This indicates broader recognition of the value of digital financial workflows beyond pure legal pressure.
What this means for late adopters
The tolerance window from January to March 2026 is over. Penalties under the Royal Decree of July 8, 2025 are now fully enforceable: EUR 1,500 for a first breach, EUR 3,000 for a second, and EUR 5,000 from the third onwards. This is no longer about planning; it is about regularizing now.
PepperHub helps Belgian companies become compliant in under five minutes, without heavy training, without subscriptions, and with a clear pay-per-document approach.