UBL Validator
Validator
🇸🇰 Validate UBL Invoices for Slovakia
UBLPlannedPeppol
UBL 2.1 is planned in Slovakia. Slovakia approved mandatory B2B e-invoicing in December 2025, effective January 1, 2027.
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
Slovakia E-Invoicing Requirements
Phase
Status
Scope
B2G
Live (Apr 2023)
Public procurement >€5,000
B2B mandatory
Jan 2027
All VAT-registered businesses (incl. freelancers)
Cross-border
Jul 2030
Intra-EU B2B (ViDA alignment)
Validation engineFinancial Administration (5th corner in Peppol model)
Required CIUSEN 16931 (UBL 2.1, CII D16B, Peppol BIS 3.0)
Government portalIS EFA (B2G platform, transitioning to Peppol by 2027)
Routing identifierIČ DPH (VAT ID) mapped to Peppol Participant ID
PeppolMandatory — Financial Administration becomes Slovak Peppol Authority
Slovakia's Peppol 5-corner model adds a reporting layer that Peppol-only integrations don't have.
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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