UBL Validator
Validator
🇱🇺 Validate UBL Invoices for Luxembourg
UBLB2G MandatoryPeppol
UBL 2.1 is required for B2G in Luxembourg. Luxembourg has fully implemented B2G e-invoicing with all businesses required to issue e-invoices to public sector entities since March 2023.
Quick Facts
What We Validate
UBL 2.1 XML schema validation
EN 16931 business rules
Namespace and element structure
Code list validation
Party and address structure
Tax calculation rules
Invoice line consistency
Common UBL Errors
Luxembourg E-Invoicing Requirements
Phase
Status
Scope
B2G (all businesses)
Live (Mar 2023)
All businesses to public sector (phased from May 2022)
Required CIUSPeppol BIS 3.0 (standard Peppol CIUS — no national extensions)
Government portalMyGuichet.lu (manual submission portal)
PeppolYes — 11 certified Access Points; 4th in Peppol adoption relative to country size
Pure Peppol, no local customization. Luxembourg uses standard Peppol BIS 3.0 with no national CIUS, making it one of the simplest markets to support if you already have Peppol integration. MyGuichet.lu is available as a fallback for manual submission. CTIE (Centre for Information Technology of the State) operates the central authority. The Ministry for Digitalisation serves as the Peppol Authority.
FAQ
What is UBL 2.1?
UBL (Universal Business Language) 2.1 is an open XML standard for business documents developed by OASIS. It defines schemas for invoices, orders, and 60+ other document types.
Is UBL the same as Peppol?
No. UBL is the document format; Peppol is the network. Peppol BIS Billing is built on UBL 2.1 with additional business rules.
Should I use UBL or CII for EN 16931?
Both are valid syntaxes for EN 16931. UBL is more common internationally (Peppol uses it), while CII is used in hybrid formats like ZUGFeRD.
What are cbc: and cac: prefixes?
These are UBL namespace prefixes. cbc: (Common Basic Components) contains simple values, cac: (Common Aggregate Components) contains complex structures.
Which standards are built on UBL?
Peppol BIS Billing 3.0, XRechnung (UBL variant), A-NZ PEPPOL (Australia/New Zealand), and Singapore InvoiceNow all use UBL 2.1 as their base syntax. Our validator checks generic UBL compliance—use format-specific validators for additional business rules.
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