Belgium’s Federal Public Service Finance has launched a new online hub compiling all official resources about the upcoming mandatory B2B e-invoicing requirements. This central page offers clear guidance on what companies must do before January 1, 2026, bringing together laws, rulings, and parliamentary discussions in one place.
Belgium’s tax authority centralizes e-invoicing information
Belgium’s Federal Public Service Finance (FPS Finance) has published a consolidated webpage explaining the upcoming mandatory business-to-business (B2B) e-invoicing regulation. The new portal gathers existing guidance, legislation, case law, and official opinions, offering businesses a complete view of what compliance will look like from January 1, 2026 onward.
From that date, all Belgian companies will need to issue structured electronic invoices for domestic B2B transactions using compliant accounting or invoicing software. Sending PDF invoices by email or through online portals will no longer be permitted.
This new online resource is the latest in a series of steps Belgium has taken to prepare businesses for full e-invoicing adoption. Earlier, we covered how the Belgian e-invoicing decree officially set January 1, 2026 as the start date for mandatory B2B e-invoicing, following approval from the European Commission’s ViDA framework.
Read more about the B2B e-invoicing decree here.
End of the Hermes platform and the move toward Peppol
As part of this transition, Belgium will phase out the Hermes platform in 2025. Hermes currently serves as a fallback mechanism for suppliers to send structured invoices to buyers not yet connected to the Peppol network. Once all Belgian businesses are required to use e-invoicing, Hermes will no longer be needed.
Discover what the closure of Hermes means for your business.
This change reinforces Belgium’s shift toward a fully Peppol-based ecosystem, ensuring interoperability and compliance across systems. Peppol will remain the primary channel for sending and receiving structured invoices in Belgium, as it aligns with EU standards such as EN16931.
Who needs to comply and who doesn’t
The new FPS Finance guidance also confirms which companies fall under the e-invoicing mandate. In short, all Belgian businesses involved in domestic B2B transactions must comply, regardless of size or industry. However, transactions with private individuals (B2C) and foreign companies without a Belgian VAT registration remain excluded.
Learn more about who must comply with Belgium’s e-invoicing rules.
What this means for Belgian companies
The publication of this consolidated guidance marks a key milestone in Belgium’s digital tax journey. It offers much-needed clarity and helps companies plan system upgrades, connect to Peppol, and ensure compatibility with structured formats such as UBL and CII.
Businesses are encouraged to start early by testing data exchange, training teams, and validating their compliance setup well before the 2026 deadline. This will prevent disruptions and ensure a smooth transition when the Hermes platform retires and structured e-invoicing becomes the only accepted format.
For those looking to explore the official materials, the FPS Finance portal provides direct access to all related laws, rulings, and regulations:
Visit the official FPS Finance e-invoicing guidance page (Fisconet+)
Key takeaways
- From January 1, 2026, all Belgian B2B invoices must be structured electronic invoices.
- PDF or email invoices will no longer be accepted.
- The new FPS Finance portal centralizes all legal and practical guidance.
- Belgium will retire the Hermes platform as all companies adopt Peppol.
- Businesses must ensure their systems comply with EN16931 and Peppol standards.
- Early preparation is essential to maintain compliance and operational continuity.
