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Belgium B2B e-Invoicing 2026: Avoid Peppol Invoice Rejections

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Belgium?s e-invoicing mandate 2026 makes Peppol verplicht for all B2B invoices. Businesses must exchange Peppol facturen in UBL XML (UBL 2.1) via a Peppol access point connected to the Peppol network and Mercurius platform.This whitepaper explains Belgian e-invoicing compliance, common rejection causes, e-invoicing Belgium exceptions, and how certified Peppol service providers help you send and receive compliant invoices and prepare for e-reporting Belgium 2028.