UBL Validator
Validator
🇧🇬 Validate UBL Invoices for Bulgaria
UBLB2G Mandatory
UBL 2.1 is required for B2G in Bulgaria. Bulgaria requires public sector entities to receive EN-compliant e-invoices but does not mandate supplier issuance.
Quick Facts
Format
UBL 2.1
Standard
EN 16931
Mandate
B2G Only
Peppol
Not connected
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
Bulgaria E-Invoicing Requirements
Phase
Status
Scope
B2G receiving
Live (Nov 2019)
Public sector must receive EN 16931 e-invoices
SAF-T (large)
Live (Jan 2026)
Large enterprises (>BGN 300M turnover or >BGN 3.5M taxes)
SAF-T (all VAT)
Jan 2030
All VAT-registered including micro-enterprises
Required CIUSEN 16931 (UBL 2.1 or UN/CEFACT CII)
PeppolNo — not connected to Peppol
SAF-T is the main compliance requirement. Bulgaria's e-invoicing landscape is minimal, but SAF-T reporting is the real integration challenge. Monthly submissions (General Ledger, AP/AR, invoices) are due by the 14th of the following month. Submissions require a qualified electronic signature (QES). The NRA provides a 6-month grace period for each phase rollout. No unified B2G platform exists — there is no mandate for suppliers to issue e-invoices.
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 Bulgaria UBL invoices
Upload and validate instantly. Auto-fix common errors.
Try the Validator