Fiscal subject related
Belgium is set to implement mandatory electronic invoicing (e-invoicing) for businesses starting January 1, 2026. This move aims to improve efficiency, reduce costs, and combat VAT fraud. The mandate will require all companies to send and receive invoices electronically via the Peppol network, which operates on the “Connect once, reach all” principle. This means that once a company is connected, it can interact with all other companies on the network.
The mandate primarily targets business-to-business (B2B) transactions, requiring businesses to use structured electronic invoices compliant with European standards, specifically the Peppol-BIS standard. However, microenterprises and the business-to-consumer (B2C) sector are exempt from this requirement.
To help businesses comply with the new regulations, the Belgian government has published an initial list of compliant software solutions just recently. This list is intended as a resource and does not imply official certification by the FPS Finance. Companies are free to choose other solutions as long as they meet the necessary compliance standards that need to be covered.
Regular updates to the list of compliant software solutions are expected as more providers meet the requirements. This initiative is designed to assist companies in selecting the right e-invoicing solution in preparation for the upcoming mandate. By January 1, 2026, all companies will need to connect to Peppol through an e-invoicing service provider operating one of the certified Peppol Access Points.
Other news from Belgium
The FPS Finance from Belgium published another update of GKS 2.0 Use Cases in Technical Documentation.

FPS Finance in Belgium has updated the GKS 2.0 technical documentation, adding three revised “Use Cases” dated 26 September 2025. Let’s look into this in more detail. Read more
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Already subscriber? LoginBelgium Publishes GKS 2.0 update: Version 2.1 of the Technical Specification for Communication Between POS and FDM

Belgium’s FPS Finance released Version 2.1 of the GKS 2.0 technical specifications, refining how POS systems communicate with fiscal data modules. The update enforces stricter use of date/time fields in RFC3339 format, clarifies functions like costCenterChange and transaction reporting, and introduces new features such as the Robotuser for automated reports. Read more
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Already subscriber? LoginUpdate of technical documentation in Belgium related to GKS 2.0 solutions: API protocol between FDM and FIN-Cloud

Belgium’s FPS Finance has released version 1.08 of the Registered Cash Register System (RCRS) Technical Specifications, refining the API protocol between the Fiscal Data Module (FDM) and FinCloud. The update introduces new data elements, security adjustments, and guidance on message size limits, enhancing accuracy, reliability, and compliance in electronic fiscal data reporting for the HoReCa sect... Read more
New Belgian Royal Decree Confirms E-Invoicing Standards, Penalties, and VAT Rounding Rules

Belgium’s Royal Decree of 14 July 2025 confirms that from 1 January 2026, structured e-invoicing via the Peppol BIS standard will be mandatory for all domestic B2B transactions between Belgian VAT-registered entities, with limited exemptions. The Decree sets technical requirements, allows alternative EU-compliant formats by mutual agreement, and introduces fines ranging from €1,500 to €5,000 for non-compliance, while also changing VAT rounding rules to permit rounding only on the total VAT amount. Read more
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Already subscriber? LoginBelgium Mandates B2B E-Invoicing via PEPPOL Starting January 2026

Belgium’s Royal Decree No. 2025005169 requires all VAT-registered businesses to use structured electronic invoices for B2B transactions starting 1 January 2026. Invoices must be sent via the PEPPOL network using EU standard EN 16931. While alternative EU-compliant formats may be used with mutual consent, all businesses must still support PEPPOL.VAT rounding is only allowed on the total amount, not... Read more
Belgiums Mandatory B2B-E-Invoicing: Important Requirements and Penalties from 2026

From 1 January 2026, structured e-invoicing in XML format will be mandatory for B2B transactions between Belgian VAT-registered businesses. E-invoices must include clear descriptions, quantities, VAT in euros, and credit note references. VAT deduction requires valid invoices and proper documentation. Courts have denied deductions for vague invoices, despite the EU’s “substance over form” principle... Read more
Belgium E-Invoicing: New Penalties for Non-Compliance Effective 2026

On July 8, 2025, Belgium confirmed that mandatory structured e-invoicing for domestic B2B transactions between VAT-registered taxpayers will begin on January 1, 2026, as per the Law of 6 February 2024. The obligation excludes B2C transactions, exempt or foreign transactions, and non-VAT-registered or bankrupt entities. Invoices must use the Peppol BIS format or a EU-compliant alternative, but all... Read more