EN 16931 Validator
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🇧🇪 Validate EN 16931 Invoices for Belgium
EN 16931MandatoryPeppol
EN 16931 is required in Belgium. Belgium went live with mandatory B2B e-invoicing on January 1, 2026, making it the first EU country to mandate Peppol as the exclusive B2B channel.
Quick Facts
What We Validate
EN 16931 semantic model compliance
Business rule validation (BR-xx rules)
VAT category rules (BR-S, BR-Z, BR-E, etc.)
Calculation rules (BR-CO-xx)
Code list validation
Party identification
Cross-border requirements
Invoice Navigator covers 89 Peppol BIS 3.0.17 rules for Belgium.
Common EN 16931 Errors
Belgium E-Invoicing Requirements
Phase
Status
Scope
B2G
Live (Nov 2022)
All federal government suppliers
B2B
Live (Jan 2026)
All Belgian VAT-registered businesses
Validation enginePeppol validation (OpenPeppol rules + Belgian CIUS)
Required CIUSPeppol BIS Billing 3.0
Government portalMercurius (B2G access point)
Routing identifierKBO/BCE enterprise number (mapped to Peppol ID)
PeppolMandatory — Peppol is the sole B2B exchange channel
Belgium is the purest Peppol mandate in the EU — no alternative channels, no national portal fallback for B2B. This simplifies format handling but creates specific integration requirements.
FAQ
What is EN 16931?
EN 16931 is the European standard for electronic invoicing. It defines a semantic data model and business rules that all EU e-invoices must follow, regardless of syntax (UBL or CII).
Is EN 16931 mandatory?
For B2G invoices to EU public sector, yes. For B2B, it depends on the country. Under ViDA (VAT in the Digital Age), EN 16931 compliance will become essential across the EU.
What syntax should I use for EN 16931?
EN 16931 supports two syntaxes: UBL 2.1 and UN/CEFACT CII. UBL is more common for Peppol; CII is used in ZUGFeRD/Factur-X. Both express the same data.
What's a CIUS?
A CIUS (Core Invoice Usage Specification) is a national adaptation of EN 16931. Examples: XRechnung (Germany), Peppol BIS (international), CIUS-RO (Romania).
How do I prepare for ViDA?
Start by ensuring your invoices comply with EN 16931. Our validator checks all the business rules that will be required under the ViDA e-invoicing mandate.
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XRechnung Validator
Answers
What is Peppol BIS Billing 3.0 and how does it work?
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