CSDR settlement discipline rules updated for T+1 in three steps

Settlement discipline is the part of the Central Securities Depositories Regulation (CSDR) that aims to prevent settlement fails, which occur when securities or cash are not delivered on the agreed date. Its detail sits in Delegated Regulation (EU) 2018/1229 (external site), a set of regulatory technical standards. A Commission Delegated Regulation now amends those standards so that the steps before settlement fit a one-day cycle (T+1).

The amendments come from the final report of the European Securities and Markets Authority (ESMA) (external site) of 13 October 2025. It proposed tighter timing, machine-readable formats and common settlement tools, applied in phases from December 2026 to 11 October 2027.

From 7 December 2026, professional clients send allocations and confirmations to their investment firm in electronic, machine-readable formats, according to ESMA's final report (external site). An allocation is the split of one executed order across several client accounts. The deadline is 23:00 Central European Time (CET) on the trade date.

From 1 July 2027, new rules apply to the reporting and disclosure of settlement fails data by central securities depositories (CSDs), as ESMA proposed (external site). The aim is to give authorities and the market data on fails a few months before the switch to T+1.

From 11 October 2027, settlement instructions go to the securities settlement system as soon as possible, and no later than 23:59 CET on the trade date. Automatic partial settlement and hold and release become functions that every CSD offers, as ESMA's statement lists (external site). Hold and release lets a participant keep an instruction on hold without cancelling it.

Partial settlement becomes the default unless a participant opts out (ESMA final report (external site)). As an example, if a seller holds 800 of the 1,000 shares sold, partial settlement delivers the 800 now and the remaining 200 later, instead of nothing.

The allocation rules bind investment firms and their professional clients; the settlement rules bind CSDs and their participants, according to ESMA (external site). Banks, custodians and asset managers act on both sides. Roles directly affected include:

• Confirmations Analyst: allocations and confirmations are exchanged electronically and completed on the trade date.
• Middle Office Analyst: client allocation details are checked against executions before the evening deadline.
• Settlements Analyst: instructions reach the settlement system by 23:59 on the trade date, with partial settlement as default.
• Custody Operations Analyst: client instructions and partial settlement choices pass to the CSD in time.
• Investment Operations Analyst: fund trades are allocated and confirmed in machine-readable form on the trade date.

ESMA sent its final report to the Commission in October 2025. ESMA's timeline (external site) foresaw endorsement of the delegated act in July 2026 and scrutiny by the European Parliament and the Council until 6 October 2026. On 16 October 2026 ESMA stated (external site) that the standards had been published and the framework was complete.

The application dates fall in three steps, which ESMA's statement of July 2026 (external site) and final report set out:

• 7 December 2026: allocations and confirmations.
• 1 July 2027: reporting of settlement fails data by CSDs.
• 11 October 2027: instruction deadline, partial settlement and hold and release, on the day the EU moves to T+1.

CSDR of 2014 created the settlement discipline regime, and its standards were deferred more than once before applying from 1 February 2022, as Delegated Regulation (EU) 2021/70 records (external site).

The original standards require investment firms to confirm receipt of a written allocation and confirmation within two hours, in Delegated Regulation (EU) 2018/1229 (external site). The amendments move this exchange to electronic, machine-readable messages completed on the trade date.