E-invoice legal validity: new Belgian rules for credit notes and VAT deduction
Brussels, 8 July 2026 – Belgium’s FPS Finance has clarified the legal status of the structured e-invoice within Belgian VAT law through Circular 2026/C/65. The circular confirms e-invoice legal validity for VAT purposes and introduces stricter rules for credit notes and other corrections.
What the new e-invoice legal validity rules set out
Circular 2026/C/65 states that the structured e-invoice, drawn up in accordance with the European standard EN 16931, becomes the primary legal and evidentiary document for VAT purposes. This document replaces earlier formats such as the standalone PDF invoice as the legally binding proof document in a B2B context between Belgian VAT-registered businesses.
The circular also introduces strict requirements for corrections. Credit notes, cancellations and other adjustments must now follow the same structured e-invoice logic wherever the e-invoicing mandate applies. This is intended to keep the entire transaction lifecycle, from original invoice to correction, digitally traceable and auditable.
In addition, VAT rounding rules are aligned with European standards, and the circular confirms that VAT deduction can be based on structured e-invoices. A limited fallback mechanism remains in place for cases where a recipient is technically unable to receive structured e-invoices.
Why this clarification was needed
Since 1 January 2026, structured B2B e-invoicing via the Peppol network has been mandatory for Belgian VAT-registered businesses. By mid-March 2026, adoption stood at around 83 percent, following an unprecedented rush of registrations in the final weeks of 2025. Now that the tolerance period is over and penalties are actually being applied, practical questions have emerged about how corrections, credit notes and the evidentiary status of the e-invoice relate to existing VAT rules.
Circular 2026/C/65 is also a step in building the legal foundation for Belgium’s mandatory e-reporting, due to take effect on 1 January 2028. That five-corner model builds technically on the existing Peppol infrastructure, but places additional requirements on the completeness and structure of the exchanged invoice data.
What this means for businesses and Peppol Service Providers
For Belgian businesses, this mainly means that correction processes can no longer be treated as an administrative afterthought. A credit note that is not processed according to structured e-invoice logic undermines the evidentiary value of the original transaction. Businesses would do well to check with their Peppol Service Provider whether credit notes and cancellations are actually processed in structured form, rather than being sent separately as a PDF or by email.
Because VAT deduction is now explicitly linked to the structured e-invoice, the quality of master data also becomes more important: VAT numbers, amounts and item codes need to be correct, or not only the invoice but also the right to deduction is put at risk. For international suppliers invoicing Belgian customers, this is an additional reason to move to structured e-invoicing via Peppol wherever possible.
Businesses looking to strengthen their implementation, or to check whether their current Peppol Service Provider supports these correction rules, can consult an independent overview of certified providers via the Peppol.nu comparison tool. More background on practical experiences since the Belgian mandate took effect is available in the earlier article Belgium e-invoicing 2026: first lessons after the deadline.
