E-invoicing in Belgium

The Belgian e-invoicing model generally covers transactions between Belgian VAT taxpayers. B2C transactions and cross-border transactions fall outside the domestic B2B mandate. For B2G transactions, the Mercurius platform connects Belgian public sector entities to the Peppol network.

For organizations with an international SAP landscape, Belgium is one of the most practical examples of a broader European trend: e-invoices are becoming structured electronic documents exchanged securely between systems.

Peppol is the primary channel for B2B e-invoice exchange in Belgium. Alternative formats or channels may be used by mutual agreement, provided they remain compliant with the European semantic standard.

For companies using SAP, however, the most important factor is not just the connection to the Peppol network itself. Equally important are accurate invoice data mapping, document validation, attachment handling, status tracking, and integration with downstream financial, procurement, and accounting processes.

For B2G processes, support for the Belgian Mercurius platform is also important. The e-invoicing architecture should accommodate different document exchange scenarios without requiring a separate solution for each one.

In Belgium, the B2B e-invoicing mandate is already in effect, so companies that have not yet completed their preparations need to act quickly to ensure their processes are compliant and fully operational. This applies in particular to organizations that have a local subsidiary in Belgium but rely on centralized SAP systems, a shared finance center, or an international invoice processing model.

The tolerance period ended on March 31, 2026. Since April 1, 2026, progressive penalties apply to companies that fail to meet the technical requirements for issuing or receiving e-invoices.

Preparations should include:

• analysis of Belgian sales and purchasing processes in SAP,
• identification of documents covered by the B2B mandate,
• data mapping to Peppol BIS Billing 3.0,
• integration with a certified Peppol Access Point,
• processing of outgoing and incoming invoices,
• validation of XML data and structures,
• handling of business attachments,
• tracking document exchange statuses,
• integration with subsequent financial processes.

In the SAP environment, the greatest risk is usually not the e-invoice format itself, but rather data quality, custom extensions, local document variants, and a lack of transparent process monitoring for business users.

For years, All for One has been helping companies adapt their SAP systems to local legal obligations and compliance requirements. A particularly important point of reference is our experience in preparing SAP systems for mandatory e-invoicing in Poland.

The All for One KSeF solution is already used by more than 120 companies integrating their SAP systems with the Polish National System of e-Invoices (KSeF). These projects have allowed us to build practical expertise in areas that are also key to Belgian Peppol implementations: data mapping, document validation, handling large volumes of invoices, integration with external systems, and developing dashboards for business users. We leverage this experience in our international projects.

All for One Poland is an accredited Peppol member. As a certified Peppol Access Point, we provide a direct connection between your SAP system and the Belgian Peppol network. Our solution has already been successfully implemented for Belgian companies operating in international manufacturing environments.

Our approach is based on the All for One E-Invoicing integration layer and communication via a certified Peppol Access Point. This allows us to integrate SAP with the Belgian e-invoicing model without having to build multiple separate interfaces for different scenarios.

We support different SAP versions and architectural models, so the solution can be tailored to the needs of local subsidiaries in Belgium, shared service centers, and international manufacturing organizations.

Belgium’s B2B e-invoicing mandate is the new operational reality. Companies using SAP should ensure that their invoices comply with Peppol BIS Billing 3.0, maintain stable communication with the Peppol network, and fully monitor the process.

All for One will help you prepare your SAP system for e-invoicing in Belgium in accordance with Peppol requirements, drawing on experience from over 120 e-invoicing projects in Poland and hands-on implementations in Belgian SAP environments.