Electronic invoicing in Belgium by 2026: How to prepare?

It is 2026, and a major European country is taking a decisive leap toward digitization. electronic invoicing in Belgium for B2B becomes the mandatory default form of invoicing. For the CFO of a large company operating in several countries, this is much more than a legal change, as it impacts processes, ERP, VAT compliance, internal controls, and interoperability with other EU countries. In this article, you will learn exactly what the regulation requires, what the main risks and technical challenges are, examples and real-life cases, and various solutions and answers to help your finance team be prepared.

What exactly will change in Belgium's electronic invoicing system in 2026?

To begin with, the changes brought about by electronic invoicing in Belgium are as follows:

• Entry into force? January 1, 2026.
• Scope? All companies established in Belgium and registered for VAT purposes will have to issue and receive electronic invoices in B2B transactions. B2C transactions are excluded for now.
• Format and technical standard? The recommended and mandatory format will be Peppol (Peppol BIS 3.0), and invoices must comply with European specification EN 16931. In practice, Belgium has opted for this model to ensure interoperability. 
• What is not acceptable? From now on, it will no longer be valid to send a PDF by email or an "image" invoice. A structured invoice that allows automatic processing (XML/UBL) is required.UBL/Peppol).

Practical impact for Spanish companies (CFOs and finance departments)

The fact is that the new Belgian electronic invoicing system entails changes for both domestic and international companies. Among them, of course, are Spanish companies that already operate in the BENELUX country, or that plan to do so in the near future. 

On the one hand, the immediate risks for companies and businesses that fail to adapt are:

• Rejection of invoices issued to/from subsidiaries in Belgium.
• Tax penalties. 
• VAT recovery issues due to formatting errors or incomplete data.
• Increase in operating costs if invoices are managed manually.

In any case, it is also an ideal time to automate processes, reduce manual processing costs, and take advantage of improvements in VAT control and traceability.

Key technical requirements that must be met now

Therefore, the new Belgian legislation requires compliance with several technical requirements, such as:

• Peppol BIS 3.0 / EN 16931 support. Operate with a system capable of generating and consuming Peppol BIS 3.0 (or convert your ERP to this standard if you use another schema). 
• Interoperable transmission channel. Have access to a Peppol Access Point or integrate the ERP with a provider that offers it.
• Pre-submission validations. Check mandatory fields (TIN/VAT, VAT codes, total per VAT type, rounding per total, etc.). In addition, Belgium introduces specific rounding rules (total level per VAT type).
• Automatic reception and reconciliation. Be able to incorporate e-invoices into your ERP and automatically reconcile them with orders, delivery notes, and contracts. 
• Auditing and compliant storage. The system's electronic archive must be traceable and retain information in accordance with VAT and accounting regulations.

Main challenges for interoperability with other European systems

In turn, although the ViDA initiative and the EN 16931 standard aim to harmonize interoperability between European countries, in practice there are several points of conflict:

• Many networks and gateways. Peppol is not the only channel in Europe; some countries use national gateways that must interoperate. Translation between networks causes data loss or unwanted transformations. 
• National variations in the use of the standard. Although EN 16931 defines the structure, Member States add local requirements (mandatory fields, rounding rules, encodings, etc.). This requires mapping and validation rules for each country.
• Tax coding and VAT treatment. Differences in how VAT rates or exemptions are coded require codes to be standardized across systems.
• Synchronization of catalogs, identifiers, and TIN/VAT. The same entity may operate with different identifiers (branches, intra-Community VAT, etc.), which complicates routing and automatic validation.
• Latency and governance of private networks. If a company uses a provider that does not offer direct connectivity with Peppol or Mercurius (specific to Belgium), it needs a gateway to convert and route.

For example, imagine a SaaS service company that bills foreign customers from Spain (in this case, Belgian). 

• Situation: Mass invoicing from a SaaS platform with recurring invoices.
• Problem: the volume is high and there is a risk of rejections due to errors in tax data (intra-Community VAT).
• Practical solution: Direct integration with a provider that offers real-time TIN/VAT validation, automatic mapping to Peppol, and logging for auditing. 

Quick comparison of options for compliance (advantages/disadvantages)

After seeing how this new legal application may impact electronic invoicing in Belgium, let's look at several options for compliance: 

Option	Advantages	Disadvantages	Best for
Native Peppol connector in your ERP	Direct integration, lower latency	Cost and development time, dependence on the ERP vendor	Large companies with centralized ERP
Middleware / E-invoicing hub (SaaS)	Flexibility, regulatory updates managed by provider	Recurring cost, external dependency	Multinationals with multiple ERPs
Own access point (implement Peppol access point)	Full routing and security control	Requires Peppol certification and operational capacity	Large groups with massive volume
Local providers / conversion gateways	Quick start-up for certain countries	Risk of incompatibilities and transformations	SMEs with limited reach or rapid rollouts

Where does easyap fit into Belgian electronic invoicing?

And since we've talked about solutions, let's highlight easyap. Specifically, because it offers you the following if you are going to operate in Belgium next year:

• Peppol and multi-channel connectivity. easyap connects to structured invoicing networks (such as Peppol) and, if necessary, to gateways for Mercurius and other national networks. This reduces integration time and the risk of conversion between networks.
• Validation and mapping by country. Pre-submission validations that you can perform with easyap (mandatory fields, VAT codes, Belgium-specific rounding rules) minimize rejections and penalties.
• Integration with ERP for AP/AR processes. The solution adapts to the most popular and powerful ERPs on the market (SAP, Oracle, Microsoft Dynamics, etc.) and has APIs to automate uploading and reconciliation.
• Control panel and tax reporting. easyap offers you traceability for each invoice (status, route, errors, etc.) and reporting prepared for future e-reporting or ViDA obligations.

Therefore, easyap reduces project costs and deadlines because it avoids complex development in the ERP. In addition, access is managed, which is ideal if you don't want to certify and operate your own Access Point. Above all, there is less risk of "transformations" because the solution works with mapping by country and relies on interoperability tests.

Checklist for complying with B2B electronic invoicing in Belgium in 2026

Finally, here is an operational checklist to help you get ready for 2026 if you are already operating or plan to operate in Belgium:

1. Audit the number of B2B invoices to and from Belgium and which systems generate them.
2. Check whether your ERP and billing systems natively support Peppol and EN16931.
3. If not, design a system integration plan that does, such as easyap: middleware, Access Point provider, or SaaS provider with Peppol connectivity.
4. Implement business validations (VAT, VAT codes, total rounding, etc.).
5. Conduct pilot tests with your Belgian suppliers or customers and with the Mercurius hubif they operate with the public sector.
6. Review the archiving and electronic preservation policies.
7. Update SLAs (service level agreements) and internal controls (rejections, notifications).

In summary, electronic invoicing in Belgium by 2026 requires rethinking technical aspects, VAT control processes, and having a clear interoperability strategy. This is where easyap is ideal, as it offers connectivity with Peppol, country-specific validations, connections with other ERPs, and more. This reduces the risk of rejections, speeds up legal compliance, and centralizes control and financial reporting. Write to us and find out more.