2026 arrives, and an important European country takes a decisive leap towards digitalization. The e-invoice in Belgium for B2B becomes the mandatory default invoicing method. For a CFO of a large company operating in several countries, this implies much more than a legal change, as it impacts processes, ERP systems, VAT compliance, internal controls, and interoperability with other EU countries. In this article, you will learn exactly what the regulation requires, its main risks and technical challenges, examples and real cases, and various solutions and answers to prepare your financial team.
What exactly changes in Belgium’s e-invoicing in 2026?
To begin, the changes brought by e-invoicing in Belgium are these:
- Effective date? 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 will have to comply with the European specification EN 16931. In practice, Belgium has opted for this model to ensure interoperability.
- What is not valid? From now on, sending a PDF via email or an “image” invoice will not be valid. A structured invoice that allows automatic processing is required (XML/UBL/Peppol).
Practical impact for Spanish companies (CFOs and financial departments)
The fact is that the new Belgian e-invoicing entails changes for both national and international companies. This includes, of course, Spanish companies that already operate in the BENELUX nation, or that plan to do so soon.
On one hand, the immediate risks for companies and businesses that do not adapt are:
- Rejection of invoices issued to/from subsidiaries in Belgium.
- Tax penalties.
- VAT recovery issuesdue to format errors or incomplete data.
- Increase in operational costsif invoices are managed in a non-automated way.
However, it is also an ideal time to automate processes,reduce costs from manual processing and leverage 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 converting your ERPto this standard if it uses another scheme).
- 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 (NIF/VAT, VAT codes, total by VAT type, total rounding, etc.). Furthermore, Belgium introduces specific rounding rules (total level by 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.
- Audit and compliant storage. That the system’s electronic archive is traceable and retains 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 contentious points:
- 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, codifications..). This necessitates country-specific mapping and validation rules.
- Tax coding and VAT treatment. Differences in how VAT types or exemptions are coded require code standardization across systems.
- Synchronization of catalogs, identifiers, and NIF/VAT. The same entity can operate with different identifiers (branches, intra-community VAT…), which complicates routing and automatic validation.
- Latency and private network governance. If a company uses a provider that does not offer direct connectivity with Peppol or Mercurius (specific to Belgium), it needs a gateway that converts and routes.
For example, imagine a SaaS services company that invoices foreign clients from Spain (in this case, Belgian ones).
- Situation: mass invoicing from a SaaS platform with recurring invoices.
- Problem: its volume is high and there’s a risk of rejections due to errors in tax data (intra-community VAT).
- Practical solution: direct integration with a provider that offers real-time NIF/VAT validation, automatic mapping to Peppol, and logging for auditing.
Quick comparison of compliance options (advantages / disadvantages)
After seeing how this new legal application can impact electronic invoicing in Belgium, let’s look at several compliance options:
Where does easyap fit into Belgian e-invoicing?
And since we’ve talked about solutions, let’s highlight easyap. Specifically, because it offers you the following if you plan to operate in Belgium next year:
- Peppol and multi-channel connectivity. easyap connects with structured invoicing networks (like Peppol) and, if necessary, with gateways for Mercurius and other national networks. This reduces integration time and the risk of conversion between networks.
- Validation and country-specific mapping. The pre-submission validations you can perform with easyap (mandatory fields, VAT codes, Belgium-specific rounding rules) minimize rejections and penalties.
- ERP integration for AP/AR processes. The solution adapts to the most popular and powerful ERPs on the market (SAP, Oracle, Microsoft Dynamics..) and includes APIs to automate loading and reconciliation.
- Dashboard and tax reporting. easyap offers you traceability for each invoice (status, route, errors…) and reporting prepared for future e-reporting or ViDA obligations.
Therefore, easyap reduces project cost and timelines by avoiding complex ERP development. Additionally, access is managed, which is ideal if you don’t want to certify and operate your own Access Point. And above all, there is less risk of “transformations” because the solution works with country-specific mapping and is supported by interoperability tests.
Checklist for B2B e-invoicing compliance in Belgium in 2026
Separately and to conclude, we provide an operational checklist to be well-prepared for 2026 if you are already operating or plan to operate in Belgium:
- Audit the number of B2B invoices to or from Belgium and which systems generate them.
- Check if your ERP(s) and invoicing systems natively support Peppol and EN16931.
- If not, design an integration plan for a system that does, such as easyap’s: middleware, Access Point provider, or SaaS provider with Peppol connectivity.
- Implement business validations (VAT, VAT codes, total rounding…).
- Conduct pilot tests with your Belgian suppliers or clients and with the Mercurius hub, if they operate with the public sector.
- Review electronic archiving and retention policies.
- Update SLAs (service level agreements) and internal controls (rejections, notifications).
In summary, e-invoicing in Belgium for 2026 requires rethinking technical aspects, VAT control processes, and having a clear interoperability strategy.Here, easyap is ideal, as it offers you Peppol connectivity, country-specific validations, connections with other ERPs… This way, it reduces the risk of rejections, accelerates legal compliance, and centralizes financial control and reporting. Contact us and discover more.
