E-Invoicing in Belgium: A Complete Guide

Belgium is moving toward full digital tax modernization with its 2026 B2B e-invoicing mandate and upcoming 2028 VAT eReporting framework. This guide gives businesses a complete understanding of how the country is adopting Peppol BIS Billing 3.0, the EN 16931 standard, and the national Mercurius infrastructure. It explains the transition from regional B2G programs in Flanders, Brussels, and Wallonia to a unified nationwide system designed to reduce VAT fraud, improve interoperability, and streamline financial operations.

Across IT, finance, product, and leadership roles, the guide outlines exactly what teams must prepare. It covers ERP readiness, structured invoice generation, Peppol integrations, validation workflows, VAT accuracy, reconciliation, governance, and change-management needs. It also highlights Belgium’s support measures for SMEs, enforcement policies, the new non-proportional penalties for non-compliance, and the roadmap toward real-time VAT reporting.

The booklet also explains how Complyance accelerates implementation through its Global E-Invoicing Transformation Standard (GETS). Businesses can connect their existing ERP or billing system, send one standard payload, and let Complyance transform it into fully compliant Peppol BIS 3.0 invoices with automated validation, monitoring, and error handling. With a proven one-week go-live path, organizations can prepare for Belgium’s mandate with confidence and minimal disruption.