E-Invoicing in Belgium
Belgium has fully embraced the Peppol network for e-invoicing, making it one of the leading adopters of this pan-European standard. The country mandated B2G e-invoicing in 2022 and will extend this to B2B in 2026.
Do I Need to Act?
Prepare Now— January 2026
Threshold: All Belgian VAT-registered businesses
Peppol BIS Billing 3.0 (UBL)
Recommended format
- 1Register with a Peppol Access Point provider
- 2Obtain your Peppol ID using your KBO/BCE enterprise number
- 3Test invoice exchange with your Peppol provider
- 4B2G already mandatory: Verify Mercurius submissions are working
Pre-configured with Belgium ruleset • Free to try
Quick Facts
Current Regulation
Peppol BIS Billing 3.0
Language
Dutch/French/German
Currency
EUR
Accepted Formats
Peppol BIS Billing 3.0 (UBL)
Upcoming Changes
B2B mandate from January 2026
Key Dates & Timeline
November 2022
B2G e-invoicing mandatory
January 2026
B2B e-invoicing mandatory
B2G Requirements
Since November 2022, all suppliers to Belgian federal government entities must send e-invoices via Peppol. The Mercurius platform serves as the government's access point. Invoices must comply with Peppol BIS Billing 3.0.
Government Portal
Mercurius
B2B Requirements
From January 1, 2026, all B2B transactions between Belgian VAT-registered businesses must use structured e-invoices. The mandate applies to domestic transactions and requires Peppol BIS Billing 3.0 format.
Technical Requirements
Belgium exclusively uses the Peppol network for e-invoicing. Businesses need to register with a Peppol Access Point provider and obtain their Peppol ID. The UBL-based Peppol BIS Billing 3.0 format is mandatory.
Accepted Formats
- Peppol BIS Billing 3.0 (UBL)
Key Requirements
- Peppol BIS Billing 3.0 format
- Transmission via Peppol network
- Enterprise number (KBO/BCE) required
- Registration on Peppol network
Common Invoice Rejections in Belgium
Top 5 validation errors based on our data
Enterprise Number Recommended
Add the Belgian enterprise number with scheme ID 0208.
Belgian VAT number recommended
Add Belgian VAT number with BE prefix.
Belgian enterprise number format
Format the Belgian enterprise number correctly with dots and add the required scheme identifier.
Belgian VAT number format
Add the BE prefix to the VAT number and ensure correct formatting.
Mercurius endpoint format
Use the proper Mercurius identifier from the Belgian government portal.
Don't wait for rejection
Validate your Belgium invoices before sending to catch these issues early.
Penalties & Non-Compliance
Specific penalties for B2B non-compliance are being defined. B2G non-compliance may result in payment delays and invoice rejection.
Belgium B2B mandate confirmed for 2026
Belgian government confirms January 1, 2026 start date for structured B2B e-invoicing mandate.
Source: Belgian Federal Public Service FinanceBelgium E-Invoicing Guides
ERP Setup Guides for Belgium
E-Invoicing Partners for Belgium
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