Key takeaways
- Mandatory B2B e-invoicing began in Belgium on January 1, 2026, requiring all Belgian VAT-registered businesses to issue and receive structured electronic invoices, primarily via the Peppol network.
- Businesses must prepare for strict technical and VAT compliance rules, including UBL-formatted invoices, accurate data validation, and readiness for future near-real-time e-reporting expected from 2028.
- Early preparation is essential—upgrading systems, validating data, and aligning workflows now will help avoid fines, payment delays, and operational disruption as Belgium transitions to a fully digital invoicing environment.
In short: Since January 1, 2026, structured B2B e-invoicing has been mandatory for Belgian VAT-registered businesses. Invoices are exchanged mainly via the Peppol network in UBL format. Near real-time e-reporting is expected from January 1, 2028.
Belgium is moving fast toward a fully digital tax system. Since January 1, 2026, e-invoicing has been a standard requirement for Belgian VAT-registered businesses. That is when mandatory B2B electronic invoicing came into effect. The Belgian government is pushing ahead with its digital-first strategy. So if you operate in the country, you must adapt how you create, exchange, and report invoices.
In this guide, we explain everything you need to know about e-invoicing Belgium. We cover the new rules, who is affected, timelines, technical standards, and compliance requirements. We also show how Taxually can help you get ready.
What is e-invoicing?
Electronic invoicing (or e-invoicing) means creating and exchanging structured electronic invoices. Accounting and tax systems can process them automatically, with no manual work. PDFs and scanned documents can’t do this. Structured e-invoices allow end-to-end automation, better accuracy, and real-time tax controls.
Belgium’s approach mirrors changes across the EU under the VAT in the Digital Age (ViDA) agenda. It makes B2B sales more transparent, cuts fraud, and makes compliance simpler.
What is Belgium’s e-invoicing mandate?
The Belgian e-invoicing mandate requires companies to issue and receive e-invoices in a recognised digital format. It started with business-to-government (B2G) transactions. Since January 1, 2026, it also covers business-to-business (B2B) transactions. We cover this in more detail in How We Built a Unified E-invoicing API for 31 Countries.
What are the objectives of the mandate?
- Faster, automated invoice processing across the economy
- Less admin work for businesses
- Stronger VAT controls under the Belgian VAT Code
- Supporting EU-wide interoperability through the Peppol framework
What are the key dates and the implementation timeline?
Belgium is rolling out e-invoicing in several stages. The legal framework is final, and the key rollout dates are now official.
Completed: public sector rollout (B2G)
Mandatory since 1 March 2024
E-invoicing is already compulsory for invoices issued to government and public sector entities. For qualifying public contracts, suppliers must issue structured electronic invoices via the Peppol network.
Now in force: mandatory B2B e-invoicing
Belgium has extended mandatory e-invoicing to all Belgian VAT-registered businesses for domestic B2B transactions.
The mandatory timeline is as follows:
December 31 2025
This was the last day that traditional, non-structured invoice formats (e.g., PDF-only or paper) were accepted in B2B transactions.
January 1 2026
Mandatory electronic invoicing began for all domestic B2B transactions. A three-month tolerance period ran until the end of March 2026. During it, businesses that could show they had prepared in time were not penalised. Read more in our guide: Spain to Introduce Mandatory B2B E-Invoicing by Second Half of 2026.
Companies must:
- Issue structured electronic invoices for B2B supplies
- Exchange invoices via the Peppol network or another compliant channel
- Include accurate VAT details, including the Belgian VAT number, in the structured invoice
- Be ready for new rules on checking and sending data under the Belgian VAT Code
Future phase: e-reporting requirements
Expected from January 1, 2028
Belgium plans to bring in near real-time e-reporting. You will need to send invoice data to the Belgian tax authorities. This aims to further strengthen VAT control and automation.
Who is affected?
The mandatory e-invoicing requirements affect:
- All companies established in Belgium
- Foreign businesses registered for VAT in Belgium
- Suppliers of goods and services issuing B2B invoices
- Any company interacting with the Belgian public sector
Businesses that only make VAT-exempt supplies under Article 44 of the Belgian VAT Code are outside the scope. Don’t assume you are excluded without checking your own situation.
How does e-invoicing work in Belgium?
Belgium follows the European standard for structured e-invoices. It relies heavily on Peppol, the leading global secure data exchange network.
What are structured electronic invoices?
Belgium requires invoices in a structured, machine-readable format. This is mainly UBL (Universal Business Language). It ensures end-to-end automation and accurate data.
What is the Peppol network?
The Peppol network is the preferred channel for exchanging e-invoices. With a certified Peppol Access Point, you can send and receive invoices securely and efficiently.
How do you comply with the Peppol framework?
To follow the Peppol framework, you must ensure:
- Correct invoice format
- Accurate supplier and customer data
- Valid Belgian VAT numbers
- Use of the right transport protocols
What about e-reporting?
Belgium is expected to bring in real-time or near-real-time e-reporting to support VAT controls. This may mean sending invoice data to the tax authority at the same time as you issue the invoice. You can also read Belgium to Launch Near Real-Time VAT Reporting by 2028.
What are the legal requirements under the Belgian VAT code?
Belgium’s VAT law sets strict rules for valid invoices. Under the e-invoicing mandate, companies must ensure:
- Invoice data is accurate and complete
- The format meets the required e-invoicing standards
- Both parties are able to exchange invoices via approved channels
- Invoices are archived digitally in accordance with Belgian law
There is no longer any flexibility on format. When the law requires structured e-invoices, you must use them, even if both parties agree otherwise.
What are the penalties for non-compliance?
If you fail to follow the mandatory electronic invoicing rules, you may face:
- Administrative fines
- VAT assessment risks
- Delays in payment
- Audit exposure
- Rejection of invoices by customers or government bodies
Non-compliance could have serious operational and financial effects. This is especially true if your business makes large or frequent B2B transactions.
What should businesses do now?
Don’t wait. Preparing early ensures a smooth transition and reduces risk.
What should you do right away?
- Assess your invoicing and ERP systems
- Ensure compatibility with UBL and Peppol standards
- Validate VAT numbers and invoice data structure
- Map workflows for automation and e-reporting
- Check that your contracts and customer links are ready for digital invoicing
Taxually’s solutions can help you with every part of Belgium’s e-invoicing rollout, from technical integration to compliance support. See how Taxually e-invoicing connects to each country's tax authority through one API.
How does Taxually help with e-invoicing in Belgium?
Taxually provides automated, scalable solutions to help you meet Belgium’s requirements. Our platform supports:
- Generation and exchange of structured e-invoices
- Peppol network connectivity
- Compliance with Belgian VAT Code rules
- Real-time checks and monitoring
- Full audit trail and digital archiving
- Seamless integration with your ERP or accounting systems
Whether you issue invoices at home or cross-border, Taxually keeps you compliant in today’s digital age.
Conclusion
Belgium is taking a major step toward digital tax. The Belgian e-invoicing mandate is changing how businesses issue and receive invoices. It is also changing how they handle VAT compliance and manage financial workflows. If you are not ready yet, act now. It helps you avoid disruption, reduce risk, and gain the efficiency that true end-to-end automation can deliver.
Do you need help with your VAT compliance? Book a free call with one of our VAT experts to find bespoke solutions for your business, optimize your VAT costs, and reach millions of new potential customers with our automated VAT solutions.
How Taxually handles this
Taxually’s e-invoicing API sends structured invoices to each country’s clearance platform, such as Italy’s SDI, Poland’s KSeF and Peppol networks, covering 32 countries from one integration. The VAT returns those invoices feed into are filed through CrossTax on the same platform.
Related guides
Frequently asked questions
When did mandatory B2B e-invoicing begin in Belgium?
Mandatory electronic invoicing for domestic B2B transactions began on January 1, 2026. Since then, traditional paper or PDF-only invoices are no longer accepted.
Who must comply with the new e-invoicing rules?
All Belgian-established businesses, foreign companies registered for Belgian VAT, and suppliers issuing B2B invoices are included. Entities working with the Belgian public sector are also affected.
What format must e-invoices follow?
Invoices must be issued in a structured, machine-readable format—primarily UBL—and exchanged through Peppol or another compliant digital channel to ensure end-to-end automation and data accuracy.
What happens if a company does not comply?
Non-compliance can lead to administrative fines, rejected invoices, payment delays, audit exposure, and increased VAT assessment risks.
What steps should businesses take now to prepare?
Companies should review their invoicing systems, ensure Peppol and UBL compatibility, validate VAT data, map automation workflows, and prepare for future e-reporting requirements expected from 2028.
