Belgium’s 2026 E-Invoicing Regulations Explained: Scope, Deadlines, and Penalties

Belgium's 2026 e-invoicing mandate requires all VAT-registered businesses in Belgium to issue and receive structured electronic invoices for domestic B2B transactions starting 1 January 2026. Invoices must use the Peppol 4-corner network in EN 16931-compliant formats (UBL 2.1 or CII 16B). Real-time reporting via Peppol 5-corner follows in January 2028, with intra-EU B2B added in January 2030.

At a glance: Belgium’s 2026 e-invoicing regulations

Scope: Mandatory for domestic B2B transactions; B2G transactions already in place
Tax authority: Federal Public Service Finance (FPS Finance)
Format: EN16931 conformant
Legal archiving period: 7 years
Penalties: Graduated fines for non-compliance, starting from €1,500
Key Dates:

• 1 January 2026: domestic B2B mandate starts
• 1 January 2028: real-time reporting via Peppol 5-corner
• 1 January 2030: intra-EU B2B mandate, aligned with EU ViDA

Belgium’s digital VAT evolution and e-invoicing mandate

Belgium entered a new era of digital VAT compliance, with e-invoicing becoming a cornerstone of regulations. From 2026, structured e-invoicing became mandatory for all domestic business to business (B2B) transactions, building on Belgium’s existing business to government (B2G) e-invoicing regulations, which already use the Peppol network. The Belgian Council of Ministers approved a draft law in July 2026, introducing mandatory electronic reporting of invoice data to the tax administration, marking the next phase of the country's VAT digitalisation strategy. The new proposal would require both suppliers and buyers to electronically report certain invoice data to the tax authority in a "near real-time" model.

With both B2B and B2G mandates in place, Belgium aims to harmonise invoice formats and transmission methods, ensuring greater interoperability and efficiency in the country’s market. The new proposal would require both suppliers and buyers to electronically report certain invoice data to the tax authority in a "near real-time" model.

What is the e-invoicing legal framework in Belgium?

Belgium’s regulations were introduced gradually. From January 1, 2026, all VAT-registered businesses must issue and receive e-invoices for domestic B2B transactions using the Peppol 4-corner network, ensuring continuity with the existing B2G standards.

All invoices must be in structured formats conforming to EN16931, primarily UBL 2.1 and CII 16B. Some hybrid formats, such as FacturX and Zugferd, are also recognised for specific use cases. Peppol will ensure harmonisation of format and communication between service providers. All e-invoices must be archived for a minimum of seven years to comply with Belgian legal requirements.

Non-compliance will result in graduated penalties, starting at €1,500 for a first offence, €3,000 for a second, and €5,000 for a third within three months.

With the new law, businesses must report e-invoices and transactional data to the tax authority in real time from January 2028 using the Peppol 5-corner model, replacing the annual customer listing report. By 2030, mandatory e-invoicing will extend to cross-border B2B transactions in the EU.

Belgium’s regulatory changes align closely with the European Union’s VAT in the Digital Age (ViDA) initiative. By adopting changes now, Belgium will ensure businesses are ready to switch when the before the deadline for EU Member States to introduce e-invoicing for domestic transactions on January 1, 2035.

Vertex e-Invoicing for Belgium’s new mandates  

Vertex e-Invoicing is ready to support businesses transitioning to Belgium’s new B2B mandates. Our automation streamlines compliance, reduces manual errors, and ensures businesses can meet strict regulatory deadlines with minimal disruption.

Vertex e-Invoicing supports compliance by:

• Automating invoice validation and transmission: Ensuring all invoices are syntactically correct and confirm to formats before routing.
• Seamless integration between ERPs and the Peppol network: Connecting key systems for both sending and receiving invoices.
• Real-time monitoring and error resolution: Automated notifications and correction workflows for rejected invoices.
• Supporting all formats and protocols: Includes UBL, CII, AS2, AS4, and HTTPs formats.
• Secure legal archiving: Invoices are stored securely for the required seven year period.

As Belgium moves towards real-time reporting and pan-European harmonisation, automated e-invoicing solutions will be essential for maintaining efficiency, transparency, and audit readiness – as well as avoiding non-compliance penalties.

Ready to future-proof your compliance? Contact Vertex today to learn how our e-invoicing solution can help your business seamlessly transition to Belgium’s new mandates.