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CSSF T+1 Settlement Readiness Survey 2026: Practical Luxembourg Preparation Guide
The 9 June 2026 CSSF and EU T+1 Industry Committee readiness-survey deadline has passed. Luxembourg market participants should now treat the survey response, or the documented reason for not responding, as the first evidence point in a broader T+1 readiness programme. The CSSF links the transition to an 11 October 2027 CSDR move from T+2 to T+1, so the remaining work is operational, not only regulatory.
Direct answer
If your firm was in scope, keep evidence of the CSSF national competent authorities' survey response and the EUIC survey decision. If the firm missed the deadline, document whether it was in scope, why no response was filed, who reviewed that decision and how readiness gaps will still be identified. The CSSF described broad participation as important for understanding Luxembourg preparedness; the absence of a survey response should not become the absence of a readiness project.
Readiness matrix after the survey deadline
| Question | What to verify now | Evidence to keep |
|---|---|---|
| Was the survey handled? | Submitted response, no-response rationale or out-of-scope decision. | Owner, date, management note and retained survey evidence. |
| Which flows are affected? | Trades, funds, markets, custodians, brokers, settlement internalisers, administrators, transfer agents and outsourced providers. | End-to-end trade-to-settlement map and impacted-flow inventory. |
| Which providers must change? | Cut-offs, file formats, matching tools, test windows, exception reports, service levels and escalation contacts. | Provider readiness confirmations, dependency register and open-issue log. |
| Can funding move faster? | Cash forecasting, FX execution, securities lending, collateral, margin, overdrafts and cross-border timing. | Funding scenario test, FX cut-off analysis and treasury sign-off. |
| Can exceptions be solved in T+1? | Late allocations, unmatched trades, stale standing settlement instructions, rejected custody messages and funding breaks. | Exception root-cause analysis, remediation backlog and target metrics. |
| Is governance active? | Board or authorised-management reporting should distinguish current readiness from projected readiness. | Management pack, residual-risk decision and next testing milestone. |
Why the CSSF survey still matters
The CSSF's 12 May 2026 communique said the complementary survey was intended to monitor industry preparedness and identify potential points of attention in Luxembourg, while the EUIC survey supported a broader EU-wide picture. On 2 June 2026, the CSSF reminded market participants that the deadline was approaching and strongly urged participation. After 9 June 2026, the useful editorial framing changes: the page should no longer tell readers how to prepare for the survey deadline; it should help them turn the survey cycle into remediation, provider follow-up and governance evidence.
Operational areas to test
T+1 is not limited to the settlement department. Test trade capture, allocation, confirmation, matching, custody instruction, standing settlement instructions, funding, FX, margin, collateral, securities lending, corporate actions, NAV timing, subscriptions, redemptions, reconciliation and exception management. If one step still assumes T+2 timing, the whole chain may remain exposed.
Fund operations need special attention in Luxembourg because management companies, AIFMs, UCITS, AIFs, central administrators, depositaries, transfer agents, portfolio managers and custodians may sit in different organisations or countries. Boards should ask whether T+1 affects dealing cut-offs, liquidity buffers, overdraft policy, custody reconciliation, investor communications and service-provider contracts.
Official sources
- CSSF: T+1 readiness complementary survey, communique published 12 May 2026.
- CSSF: Reminder of the importance of participating in T+1 initiatives, communique published 2 June 2026.
- CSSF: T+1 Settlement - Preparing for the future of European financial markets, topic page for ongoing T+1 materials.
Bottom line
As of 21 July 2026, the survey deadline is historical but the readiness work is live. Use the survey record to start or challenge the project plan, then focus on provider dependencies, T+1 exception capacity, funding compression, testing evidence and board-level residual-risk decisions before the 11 October 2027 transition.