Luxembourg Financial Regulatory News:
The Commission de Surveillance du Secteur Financier (CSSF) announced on September 25, 2025, the availability of the new XML schema for CSSF – U1.1 reporting in Luxembourg. This new format, outlined in the annex to Circular CSSF 15/627, will officially take effect for the December 2025 reporting period.
The official link for this communication related to “Reporting U1.1 – Availability of the new XSD schema” is https://www.cssf.lu/en/2025/09/reporting-u1-1-availability-of-the-new-xsd-schema/.
For clear Understanding Circular CSSF 15/627 and CSSF U1.1 reporting Requirements, please read our explanation news article at https://ratiofy.lu/cssf-u1-1-reporting-in-luxembourg-in-focus-understanding-circular-cssf-15-627-and-cssf-u1-1-reporting-requirements/.
The updated XML schema is now accessible on the CSSF’s official website. A key feature of this new schema is its backward compatibility, allowing it to work with the current reporting version, as per this communication related to “Reporting U1.1 – Availability of the new XSD schema”
While the new schema includes additional fields that are currently optional, the CSSF has noted that these fields will become subject to validation checks in future reporting periods. Firms are encouraged to review the updated technical documentation to prepare for the upcoming changes.
This release is part of the CSSF’s ongoing efforts to streamline and enhance its supervisory reporting requirements. The new schema aims to improve the efficiency and accuracy of data submission from financial institutions, as per this communication related to “Reporting U1.1 – Availability of the new XSD schema”
Key Information:
- New Reporting Format: U1.1
- Effective Date: As of the December 2025 reporting period
- Schema Availability: On the CSSF website
- Key Feature: Backward compatibility
- Important Note: New optional fields will be subject to future validation checks.
This news related to Circular CSSF 15/627 and CSSF – U1.1 reporting in Luxembourg can be considered beneficial under CSSF-Circulars, IFMs (AIFMs, ManCos) News, Must Read, Undertakings for collective investment (UCIs).
The pre-filled example templates for many CSSF Circulars should be available at https://ratiofy.lu/templates/ from Christmas 2025.
