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January 2026: Belgium makes E-Invoice mandatory for B2B

Since January 1, 2026, Belgium requires structured e-invoicing for domestic B2B transactions. This article explains who is affected, which formats apply (EN 16931 and Peppol), key transition timelines, and what POS vendors need to do to stay compliant.

Victoria Waba, Content Marketing Manager
Victoria WabaContent Marketing Manager

E-invoicing in Europe is steadily advancing and Belgium, where structured electronic invoicing for business-to-government (B2G) has already been in force since 2024, is next in line.

Now, the country is taking the next step and extending the application scope to B2B: As of January 1,  2026, all Belgian VAT-registered businesses issuing invoices to other Belgian VAT-registered businesses must use e-invoices for those B2B transactions.

Electronic invoicing differs from traditional invoicing by being entirely digital from creation to processing, eliminating the need for physical handling and enabling automated, integrated workflows that reduce manual data entry and errors.

What are the B2B e-invoicing requirements? Who is affected by the changes? And what does all of this mean in practice? Let’s have a look.

January 1, 2026: B2B E-invoicing mandate in Belgium begins

On January 1, 2026, Belgium introduced a nationwide requirement for structured electronic invoicing (e-invoicing) for business-to-business (B2B) transactions. This marks a significant shift in how companies issue, exchange and process invoices and it directly impacts POS vendors whose systems support billing and invoicing functions.

This new requirement is part of a broader trend toward mandatory electronic invoicing in Europe and globally, as many countries have implemented mandatory e-invoicing regimes to modernize tax compliance. E-invoicing adoption is being driven by government mandates to enhance tax compliance and reduce fraud.

What is changing for mandatory electronic invoicing in Belgium?

Under the new rules, all Belgian VAT-registered companies that sell to other VAT-registered businesses must issue and receive structured electronic invoices beginning January 2026.

This requirement applies to most B2B domestic transactions and means that traditional invoice formats like PDF or paper will no longer be sufficient for compliance. E-invoices are machine-readable and integrate directly into accounting systems and accounts payable departments, reducing the need for manual processing.

These structured e-invoices must be machine-readable and follow recognized formats such as those based on European standards (e.g., EN 16931 and Peppol BIS), enabling automatic processing in accounting and ERP systems.

3-month tolerance window from January to March 2026

The Belgian tax authorities announced a three-month tolerance phase covering the first quarter of 2026 that applies to

  • Businesses that currently lack the technical capability to send and receive structured electronic invoices.
  • Businesses that are unable to issue structured electronic invoices because their own systems, or those of third parties they depend on.

During the grace period, penalties for non-compliance linked specifically to the new e-invoicing rules generally won’t be applied ifbusinesses can show they have taken reasonable and timely steps to comply. They are still required to meet invoicing obligations by using alternative formats such as PDF or alternative delivery methods like email.

Near-real-time E-reporting of invoice data planned for 2028

While electronic invoicing refers to the exchange of invoices in a machine-readable format, e-reporting is the transmission of invoice data to the tax authority.

Belgium is planning to introduce near-real-time digital VAT reporting via structured data around 2028, where invoice data will be reported almost immediately to the tax authority through a five-corner Peppol model.

B2B E-invoicing in Belgium

The scope of the mandate encompasses domestic B2B transactions: All companies established in Belgium and registered for VAT must issue and receive structured e-invoices for B2B transactions starting 1 January 2026.

The mandate applies to:

  • VAT-registered suppliers and buyers established in Belgium
  • B2B transactions that are subject to Belgian VAT
  • Credit notes and other transactional documents that relate to the original invoice

There are some specific exceptions (for example, companies exclusively conducting VAT-exempt activities or those without a Belgian establishment may be treated differently), but the general rule is broad.

Notably, business-to-consumer (B2C) invoices are not (subject to this e-invoicing requirement at this time, though businesses that serve private customers must still be capable of receiving structured e-invoices from their suppliers.

B2B invoices must be issued in a structured electronic format and comply with EN 16931 (the EU e-invoice standard). In Belgium, the standard format used in practice is Peppol BIS (XML). Invoices are typically exchanged via Peppol, a Pan-European and growing international network and specification for the secure exchange of electronic business documents.

An electronic invoice by definition contains structured, machine-readable data. This excludes formats such as PDFs (even if sent electronically), paper invoices, or scanned and image-based invoices.

For POS vendors serving the international market, the Belgian mandate presents both a requirement and an opportunity:

  • Your software must support generation and transmission of structured electronic invoices that comply with Belgian rules.
  • Integrating e-invoicing capabilities strengthens your value proposition across Europe, where similar mandates are rolling out in multiple countries.

Supporting structured e-invoicing (e.g., via Peppol or compliant XML formats) within your POS or connected billing systems allows your customers to stay compliant without manual workaround solutions.

A clear path to VAT compliance and tax reporting with one integration

Implementing compliant e-invoicing from the outset helps businesses avoid penalties and ensures seamless VAT reporting. Changes and diverse requirements (standards, formats, transmission networks) across a growing set of European mandates can be tricky.

fiskaly E-INVOICE is an API specifically made for POS and ERP software providers and helps you to integrate e-invoicing compliance across Europe with minimal engineering overhead. With support for key EU standards and automatic regulatory updates, you can:

  • Issue and validate structured e-invoices aligned with Belgium’s 2026 mandate and beyond.
  • Integrate e-invoicing seamlessly into POS or ERP systems using one documented API.
  • Reduce compliance risk while delivering scalable, future-ready invoicing functionality.

Need a strong partner?

  • Understanding complex requirements can be tricky. fiskaly helps businesses and software providers to simplify compliance through easily integrated cloud-based solutions and expert technical support.
  • Over 1,900 customers trust our fiscalization solutions.

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