🇧🇪 Belgium E-Invoicing Mandate 2026

Overview of E-Invoicing in Belgium

Belgium is set to become one of the next EU member states to mandate structured electronic invoicing for business-to-business (B2B) transactions. Starting January 1, 2026, all VAT-registered businesses operating in Belgium will be required to send and receive e-invoices in the Peppol BIS 3.0 format for domestic B2B transactions. This represents a significant shift from the current voluntary adoption model and places Belgium alongside Italy and France in the wave of EU countries moving toward universal e-invoicing.

The Belgian government views mandatory e-invoicing as a critical tool for combating VAT fraud, reducing administrative costs, and modernising the country's business infrastructure. Belgium's choice of the Peppol network as the backbone for B2B e-invoicing aligns with the broader European direction and makes cross-border interoperability straightforward — particularly with neighbouring countries like Germany and the Netherlands, both of which are also moving toward or already using Peppol.

Timeline of Belgium's E-Invoicing Mandate

Who Is Affected?

B2G (Business-to-Government)

The B2G mandate is already in effect. All businesses invoicing Belgian federal agencies must submit electronic invoices through the Mercurius platform. This has been the case since 2024, and compliance is well-established among government suppliers. If you supply goods or services to the Belgian government and are not yet sending e-invoices, you are already non-compliant.

B2B (Business-to-Business)

From January 1, 2026, every VAT-registered business in Belgium must be capable of sending and receiving structured e-invoices for domestic transactions. Unlike some other countries that phase in the mandate by company size (as France and Germany are doing), Belgium is implementing a single go-live date for all businesses. This means SMEs, freelancers, and large corporations are all subject to the same January 2026 deadline.

B2C (Business-to-Consumer)

Business-to-consumer invoicing is not currently included in the mandate. There is no announced timeline for extending the e-invoicing requirement to B2C transactions, although businesses may voluntarily send structured invoices to consumers who can receive them.

Required Formats and Technical Standards

Belgium has standardised on the Peppol BIS Billing 3.0 format, which is based on UBL 2.1 (Universal Business Language). This format is fully compliant with the European standard EN 16931, ensuring interoperability across the EU. For a detailed breakdown of the format, see our Peppol BIS 3.0 guide.

Key technical requirements include:

• Format: Peppol BIS Billing 3.0 (OASIS UBL 2.1 syntax)
• Transport: Peppol eDelivery Network (AS4 protocol)
• Identifiers: Belgian enterprises use their KBO/BCE enterprise number as the Peppol participant ID
• Validation: Invoices must pass Peppol business rules and Belgian-specific validation (CIUS)
• Compliance: Full EN 16931 semantic data model compliance

PDF invoices, even those with embedded XML data, will not satisfy the B2B mandate. Only structured XML invoices transmitted through the Peppol network will be considered compliant. If you currently work with hybrid formats like ZUGFeRD or Factur-X, you will need to ensure your invoices are sent as Peppol BIS 3.0 for Belgian domestic transactions.

How to Prepare for the Belgium E-Invoicing Mandate

1. Register on the Peppol network. You need a Peppol Access Point provider to send and receive invoices. Your accounting software vendor may already offer this.
2. Update your invoicing software. Ensure your ERP or accounting tool can generate Peppol BIS 3.0 UBL invoices and connect to the Peppol network.
3. Map your invoice data. Verify that all mandatory fields (seller/buyer identification, VAT numbers, line items, tax breakdowns) are correctly populated in the structured format.
4. Test with trading partners. Send test invoices through the Peppol network before the mandate takes effect.
5. Plan for credit notes. The mandate also applies to credit notes — see our credit note guide for details on structuring these correctly.

Belgium vs. Other EU Countries

Belgium's approach differs from its neighbours in several important ways. While Germany is phasing in its mandate over 2025–2028 and allowing multiple EN 16931 formats (XRechnung, ZUGFeRD), Belgium mandates a single format — Peppol BIS 3.0 — with a single go-live date. France uses a platform-based model (Chorus Pro and PDPs) with Factur-X as the preferred format. Italy, the EU pioneer, runs its own FatturaPA format through the centralised SDI system.

Belgium's choice of Peppol is arguably the most "pan-European" approach, making it straightforward for businesses already on the Peppol network to comply without adopting a country-specific format.

Frequently Asked Questions