E-invoicing has long been a priority in Europe, established by Directive 2014/55/EU for Business-to-Government (B2G) transactions. Like other EU countries, Belgium has already fully implemented B2G e-invoicing. However, as of 2026, Belgium's digital transition will significantly expand into B2B transactions, with a move to e-reporting in 2028, aligning with the EU’s comprehensive VAT in the Digital Age (ViDA) reforms.

Key takeaways from this guide

E-invoicing in Belgium explained

Until recently, Belgian B2B invoicing was fragmented, with 60% exchanged via email PDF and 25% still paper-based. The mandatory e-invoicing law, approved to "create the conditions that will allow e-invoicing to fully break through," is the government's tool to automate processes, combat the VAT gap, and modernize the economy.

The 2026 mandate: Structured B2B E-invoicing

On 1 January 2026, Belgium will make structured e-invoicing compulsory for all domestic Business-to-Business (B2B) transactions involving VAT-registered businesses.

The obligation applies to Belgian-established VAT-registered businesses for transactions taxable in Belgium. Non-established VAT-registered businesses are generally excluded from the mandate for issuing e-invoices, but must still be able to receive compliant e-invoices from their Belgian suppliers.

At the heart of the mandate is the EN 16931 European standard, ensuring a consistent semantic data structure. The mandated transmission backbone is the Peppol network, specifically the Peppol BIS 3.0 (UBL) specification. While Peppol is the default, companies may use alternative EN 16931-compliant syntaxes only if they agree bilaterally in a written agreement. Critically, every VAT-registered business must maintain the technical capability to issue and receive Peppol BIS invoices, regardless of any mutual agreement.

A key official clarification emphasizes the seriousness of non-compliance: to exercise the right to deduct Input VAT, the recipient must, in principle, be in possession of a valid B2B structured e-invoice. This makes non-compliance a significant financial risk for the buyer, potentially jeopardizing VAT recovery. Furthermore, the recently confirmed Royal Decree introduces fixed administrative fines for failing to have the technical capacity to issue or receive structured e-invoices, starting at €1,500 for a first offense.

From an Accounts Receivable (AR) perspective, suppliers will need to ensure that all outbound invoices are created in an EN 16931compliant format and transmitted via Peppol (or another mutually agreed syntax). This requires system changes to generate structured files rather than PDFs, as well as proper VAT number validation and master data accuracy checks. Errors at this stage could lead to rejected invoices and delayed payments, making data quality and automation critical.

For Accounts Payable (AP) teams, the transition is equally significant. Incoming invoices will now arrive in structured electronic format, meaning ERP systems must be configured to automatically ingest, validate, and reconcile them. The upside is reduced manual data entry and fewer errors, but only if businesses adapt their internal approval workflows and ensure master data is correctly aligned.

Preparing for 2028: E-reporting and ViDA alignment

The 2026 mandate is the foundation for the next major reform: real-time e-reporting, planned to begin on 1 January 2028.

This system will transition from the current 4-corner Peppol model to a 5-corner model, where the Belgian tax authority effectively becomes a mandatory participant in the transaction flow. Every invoice will be transmitted not only to the trading partner but also directly to the government. This Continuous Transaction Control (CTC) model will create near real-time visibility of transactions, allowing the tax authority to monitor compliance immediately and eventually replacing existing annual reporting obligations like the Customer Listing.

Accounts Receivable (AR) teams will face a dual-validation step, as invoices must be accepted by both the customer and the tax authority. This means errors at the tax authority level could cause issues even if the customer has already accepted the invoice, making robust monitoring tools and error resolution processes critical for suppliers. This reform aligns Belgium with the EU’s broader VAT in the Digital Age (ViDA) initiative, positioning the country for future-proof digital tax compliance.

On the AR side, every invoice issued will be transmitted not only to the buyer, but also directly to the Belgian tax authority. This effectively creates a dual validation step as invoices must be accepted by both the customer and the government. Suppliers will need robust monitoring tools to track statuses and resolve errors quickly for example, if the tax authority rejects an invoice after it has been accepted by the buyer. Invoice lifecycle visibility will become a key requirement.

For AP departments, real-time e-reporting introduces new reconciliation challenges. Buyers will not only need to check whether an invoice is correct from a business perspective but also whether it has been successfully cleared by the tax authority. Discrepancies could affect VAT deductibility, meaning AP teams will play a central role in ensuring compliance. Companies may need to update approval chains and introduce automated matching between tax authority acknowledgments and internal records.

Belgium e-invoicing in the broader European context

Belgium's e-invoicing mandate is not happening in isolation; it is a direct result of and a preparatory step for a wider European movement toward harmonised digital VAT reporting, anchored in the European Commission’s "VAT in the Digital Age" (ViDA) initiative.

The ViDA package, formally adopted in March 2025 and entering into force in phases starting April 2025, sets out a definitive roadmap for how VAT will be administered across the EU in the coming decade. Its key objectives are threefold:

1. First, ViDA champions the promotion of structured e-invoicing as the default standard across the EU. This means the EN 16931 compliant structured invoice is now unequivocally recognized as the European norm for digital invoicing. 

2. Second, the initiative eliminates buyer consent requirements for e-invoicing, a critical step that removes the legal barrier that previously required a buyer's agreement before a supplier could send a structured e-invoice. This change, which Member States can implement early, paves the way for mass, mandatory adoption.

3. Third, ViDA introduces a mandatory Digital Reporting Requirement (DRR) for all intra-EU B2B transactions, set to commence on 1 July 2030. This requirement will necessitate the digital reporting of transaction data to tax authorities in near real-time, effectively replacing today’s summary recapitulative statements (known as EC Sales Lists).

For Belgium, this means its domestic B2B e-invoicing mandate starting in 2026 and its planned move to a 5-corner e-reporting model in 2028 are more than national policy experiments. They are critical stepping stones to full compliance with the EU’s 2030 ViDA vision. By moving early with a Peppol-based system, Belgium not only proactively tackles its VAT gap but also ensures that its businesses and digital infrastructure will transition smoothly when the mandatory ViDA digital reporting requirements come into effect across the entire Union.

(Conclusion)

Want more information on e-invoicing in Belgium?

For a full overview of e-invoicing in Belgium and a detailed breakdown of the current requirements, please visit our dedicated e-invoicing in Belgium page.

Alternatively, please feel free to contact us today. We are more than happy to provide additional information regarding what you need to do to ensure your business is capable of meeting its future compliance obligations. 

The ecosio Product team