CTIE — multilingual eGovernment

Behind Luxembourg's online government services — incorporating a company, filing a case, receiving an invoice — sits a single operator: the CTIE (the state IT centre). It runs the MyGuichet.lu portal, the electronic identity (LuxTrust, eID card, LU-EID) and the state's PEPPOL access point. Its specificity: all of this works in a trilingual country — French, German, Luxembourgish.

History — building the digital state

Luxembourg made digitalisation a political priority, going so far as to set up a dedicated ministry. The CTIE is its operational arm: it unified administrative procedures around guichet.lu (information) then MyGuichet.lu (authenticated procedures with document upload and signature). Electronic identity coalesced around LuxTrust, the national operator, then the electronic identity card (eID).

When B2G electronic invoicing became mandatory (act of 13 December 2021), the CTIE logically hosted the state's PEPPOL access point and offered an entry channel for small entities without equipment — a natural extension of its eGov mission.

Luxembourg eGovernment stack (operated by the CTIE)

  Citizen / business portal
    guichet.lu (information)   MyGuichet.lu (authenticated procedures)
            │                          │
            ▼                          ▼
  Electronic identity
    LuxTrust  ·  eID card  ·  GouvID app  ·  LU-EID (eIDAS)
            │
            ▼
  B2G exchanges
    State PEPPOL access point (PEPPOL BIS 3.0 invoices)
            │
            ▼
  Centralised public accounting

  Official administrative languages: FR · DE · LB

Governance — the CTIE

The CTIE reports to the ministry in charge of Digitalisation. It designs, hosts and operates the state's information systems: portals, identity, secure messaging, and now the PEPPOL rail. Its central position lets it impose common standards (single identity, exchange formats) across all administrations and municipalities.

Technical building blocks — MyGuichet, eID, PEPPOL

Authentication relies on LuxTrust (token / app) and the eID card, now brought together under the LU-EID identity notified under the European eIDAS regulation — letting a Luxembourg citizen authenticate on public services of other member states. On MyGuichet, a company can manage its procedures and manually issue a PEPPOL invoice to the state.

<!-- PEPPOL: the invoice is language-neutral,
     but human-readable labels can be FR / DE / LB -->
<cac:InvoiceLine>
  <cbc:ID>1</cbc:ID>
  <cac:Item>
    <!-- Readable name: FR, DE or LB interchangeably -->
    <cbc:Name>Prestation de conseil / Beratungsleistung</cbc:Name>
  </cac:Item>
</cac:InvoiceLine>

<!-- The CODES (rates, units, currencies) stay normalised,
     language-independent -->
<cbc:DocumentCurrencyCode>EUR</cbc:DocumentCurrencyCode>

The trilingualism challenge

Usage and services

• MyGuichet.lu — single window for authenticated procedures for citizens and businesses.
• LU-EID / eIDAS — notified identity, usable across borders within the EU.
• PEPPOL access point for the state operated by the CTIE, the entry door for B2G invoices.
• Free manual entry of PEPPOL invoices for micro-enterprises without connected software — no barrier to entry.

Common pitfalls

• Thinking you must translate the codes. VAT, currency and unit codes are normalised: you don't translate them, only the human labels.
• Confusing guichet.lu and MyGuichet.lu. The former informs, the latter enables authenticated procedures.
• Forgetting the CTIE operates PEPPOL. The state's access point is the CTIE — it validates and routes the invoice.
• Assuming manual entry is paid. The MyGuichet PEPPOL entry channel is free, so as not to exclude micro-enterprises.

Cross-links

• Luxembourg hub — full view
• B2G PEPPOL — act of 13 December 2021
• The pure-PEPPOL model
• Matricule, RCSL & identifiers
• ViDA & Luxembourg 2030
• CTIE — official site
• Guichet.lu