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

Format

UBL 2.1

Standard

EN 16931

Mandate

Planned

Peppol

Connected

Portal

IS EFA ↗

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

#1UBL-CR-001Invalid XML syntaxFix guide

#2UBL-CR-002Invalid namespaceFix guide

#3UBL-SR-01Namespace declaration requiredFix guide

#4UBL-SR-06Invalid date formatFix guide

#5UBL-CR-005Empty element not allowedFix guide

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.

Validate your Slovakia UBL invoices

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