Croatia · HR-CIUS: e-invoice formats and rules
Use this page to choose the Croatia · HR-CIUS check, identify the fixed package and follow diagnostic examples before sending an invoice to its recipient.
Formats and syntax
The Croatian tax administration publishes the UBL 2.1 eRačun documentation and national extensions through its technical-documentation portal. HR-CIUS specializes the European invoice model; HR extensions carry additional Croatian information. The XML namespace and customization value identify how those constraints apply. A rendered invoice is not enough to test the UBL structure, and changing an extension prefix alone does not correct the namespace that identifies its actual meaning.
Rules XSDHub applies
XSDHub runs the official Croatian XSD and HR-CIUS/EXT 2025 1.0.0 artefacts dated 13 March 2026, with EN 16931 validation artefacts 1.3.16. The supported input is UBL 2.1 Invoice or CreditNote. The declared versions are fixed for reproducible reports and should be compared with the recipient’s requested revision. Neither fiscalization messaging nor the tax administration’s acknowledgement is reproduced by this schema and business-rule evaluation.
Who this affects
Porezna uprava describes domestic B2B exchange and fiscalization, distinguishing VAT-registered businesses from businesses outside the VAT register. Its official portal explains their differing issuance and reception obligations. B2G means a business invoices a public-sector customer and has its own public-procurement context. Check the Fiscalization Act, the eRačun regulation and the recipient’s channel for the transaction at hand instead of treating every Croatian billing scenario as identical.
Common errors to investigate
- HR-BR-1: invoice identifier whitespace — Remove whitespace from the document invoice number, including tabs or newlines accidentally introduced by copying.
- HR-BR-37: operator name — Put the required operator label in SellerContact/Name; the supplier’s company name is a different field.
- BR-S-08: VAT category — Match taxable amounts to the correct category and rate, including category-specific adjustments.
| Check | XSDHub coverage |
|---|---|
| XML structure and fixed rules | HR-CIUS/EXT 2025 1.0.0, 2026-03-13 + EN 16931 1.3.16; UBL 2.1 |
| Certification and legal acceptance | Not provided |
| Government portal submission | Not provided |
| Peppol | Not supported yet |
Working with the result
Select the Croatian checker and upload the UBL document only after reviewing the server-processing notice. Read national findings alongside the European totals checks, then regenerate the invoice from your source system. Rechecking the same version makes the result easier to compare. These rule examples explain concrete repair paths; they do not claim a measured prevalence among Croatian users. Official delivery, fiscalization, signatures and recipient registration remain separate work after technical validation.