From January 1, 2026, all B2B companies must comply with the new electronic invoicing rules in Belgium. This is not just a technical change but a regulatory shift that has a direct impact on the day-to-day management of tax documents. In this article, we answer the most common questions and present a concrete solution to address the obligation without disrupting your business systems: A-Cube’s E-invoicing API. 

1. Who is subject to the electronic invoicing requirement in Belgium and what does the legislation entail?

The requirement applies to all Belgian B2B companies registered for VAT, regardless of size or sector. The legislation requires invoices to be issued and received in a structured electronic format that complies with the European standard EN 16931. To do this, it is necessary to use the Peppol network, which has already been adopted by numerous companies in many countries.

Traditional PDFs can be sent by email but will no longer be considered valid for VAT purposes, as will paper documents.

2. What happens if I am not ready to issue and receive electronic invoices?

If your company is one of those required to comply with electronic invoicing in Belgium but you have not yet done so, you may encounter practical problems such as late payments, customers refusing to accept invoices, or suppliers being unable to receive them. You may also incur administrative penalties ranging from €1,500 for the first violation to €3,000 for the second and up to €5,000 for subsequent violations.

3. Do I need to change my ERP or management system to comply?

Thanks to solutions designed to integrate with the management systems you already use, compliance can be achieved gradually and without invasive interventions. With A-Cube’s E-invoicing API, you can connect your internal systems directly to the Peppol network and comply with regulatory requirements without having to change software. The API is compatible with the main ERP, CRM, and accounting systems and allows you to issue and receive invoices in a compliant, secure, and fully traceable manner. This makes electronic invoicing in Belgium quick and easy.

4. What does A-Cube’s E-invoicing API actually do?

The E-invoicing API covers the entire document cycle for electronic invoicing in Belgium, from generation to transmission to receipt, validation, and storage. It allows you to automatically send and receive XML or JSON electronic invoices and monitor incoming and outgoing flows in real time, with statistics grouped by batch or VAT number. Invoices are processed as soon as they are sent, without queues or delays. With webhooks, you can define the notifications that the API must send to internal systems, such as automatic response management or status updates.

5. How is the API integrated? How long does it take to become operational?

Integrating the E-invoicing API is quick and easy, even for those who do not have a structured internal IT team. A-Cube provides complete documentation in OpenAPI and ongoing technical support even after installation. In addition, you can try out the API and run simulations.

6. What are the advantages of choosing the A-Cube API for electronic invoicing in Belgium?

The A-Cube API for electronic invoicing guarantees maximum security thanks to end-to-end encryption, complete tracking of operations, and a notification system that allows you to monitor the status of each document in real time. It is perfectly scalable according to volume and meets the needs of all types of businesses. Furthermore, it is already prepared for future regulatory challenges such as those envisaged by the VAT in the Digital Age (ViDA) package, ensuring continuity even in evolving regulatory scenarios.

The obligation changes, A-Cube simplifies

A-Cube has been developing solutions for the exchange of digital tax and banking documents for over 10 years. Its API-first solutions integrate easily with more than 250 ERP systems, ensuring continuous operation even with large volumes: we are talking about over 50 million invoices managed each year and more than 100,000 companies served in various economic sectors. It is also an ISO 27001-certified Peppol Access Point. The ideal partner to ensure that electronic invoicing in Belgium is not an obstacle but a step forward in the digitization of business processes.