CIUS-IT is Italy's set of rules for EN 16931 invoices in UBL 2.1 or CII D16B that go to Italian public administrations through the Sistema di Interscambio (SdI). The SdI checks each file, translates it into FatturaPA, seals the translation and delivers it with the original. Invoices from Italian sellers also follow an Italian extension. The current technical rules are version 2.5. Klarbon support is planned, not available yet.
What is in a CIUS-IT invoice?
| Property | Value |
|---|---|
| Model | EN 16931-1:2017+A1:2019 |
| Syntax | UBL 2.1 or CII D16B |
| Cross-border identifier | urn:cen.eu:en16931:2017#compliant#urn:fatturapa.gov.it:CIUS-IT:2.0.0 |
| Domestic invoices | add the Italian extension, urn:fatturapa.gov.it:EXT-IT:1.0.0 |
| Buyer address | iPA code with scheme 0201 |
| File names | UB for UBL or II for CII, then the sender identifier and a number, for example UB12345678901_00001.xml |
| Signature, if used | CAdES-BES or enveloped XAdES-BES |
| Channels | PEC, SDICoop, SDIFTP, the Fatture e Corrispettivi portal, or Peppol through an access point linked to the SdI |
| Rules | Agenzia delle Entrate technical rules 2.5, 22 November 2024 |
The Agenzia delle Entrate publishes the rules, the CIUS-IT and extension rule lists, and the mapping from the European model to FatturaPA (technical rules 2.5). AgID explains the legal basis, Legislative Decree 148/2018, with reception required from 18 April 2019 for central government and from 18 April 2020 for other contracting authorities, and the route over Peppol (AgID).
CIUS-IT or FatturaPA?
| CIUS-IT | FatturaPA | |
|---|---|---|
| Model | European, EN 16931 | Italian |
| Syntax | UBL or CII | FatturaPA XML |
| Main use | invoices to Italian public bodies, often from abroad | ordinary national-format invoices through the SdI, B2B and B2G |
| Delivered to the buyer | as a FatturaPA translation with the original | as sent |
What does Klarbon do with CIUS-IT invoices?
Checking the CIUS-IT rules is planned, not available yet. Klarbon opens supported UBL 2.1 and CII D16B EN 16931 invoices, and opens supported FPR12 FatturaPA files in beta; see the invoice viewer. Klarbon does not send invoices to the SdI.
Related
Frequently asked questions
What is CIUS-IT?
The Italian Core Invoice Usage Specification, a set of restrictions on EN 16931 that UBL and CII invoices must meet to pass through the Sistema di Interscambio (SdI) to Italian public administrations. For invoices from Italian sellers, an Italian extension applies as well.
Which identifier does a CIUS-IT invoice carry?
A cross-border invoice to an Italian buyer carries urn:cen.eu:en16931:2017#compliant#urn:fatturapa.gov.it:CIUS-IT:2.0.0 in BT-24. A domestic invoice, where the seller country is IT, adds
What does the SdI do with a UBL or CII invoice?
It checks the file against EN 16931, the syntax, CIUS-IT and, for domestic invoices, the Italian extension. It then translates it into FatturaPA, seals the translation with a CAdES signature of the Agenzia delle Entrate, and delivers the translation, a conversion report and the original.
How is the public body addressed?
With its code in the Indice delle Pubbliche Amministrazioni (iPA), using electronic address scheme 0201 on the buyer's electronic address.