UK T+1 settlement: firms face December readiness milestones

UK financial firms must complete key processing and automation changes by 31 December 2026 ahead of the move to next-day securities settlement on 11 October 2027, according to UK Accelerated Settlement Taskforce chair Andrew Douglas.

Taskforce research shows 83% of firms are actively preparing for T+1. Douglas says the priority must now move from participation to demonstrated readiness, including checks on the clients, counterparties and service providers involved in completing each transaction.

What happened

The UK, EU and Switzerland are moving from T+2 to T+1 settlement on the same October date. The change shortens the settlement timetable from two days after a trade to the following day, requiring financial firms to complete their post-trade work much sooner.

Douglas says the operational window will shrink more sharply than that headline change suggests. Firms will have only 20% of their existing processing time available, while still needing to carry out the full range of activities required to settle trades.

That workload includes allocating trades, confirming and matching transaction details, arranging funding and foreign exchange, handling securities recalls and processing corporate actions. All must fit within the compressed timetable rather than being reduced in scope.

Fund managers have particular work to do on funding, foreign exchange and allocations, Douglas says. Their preparations need to address how those activities will function within the shorter window, not simply whether individual systems can process transactions more quickly.

Custodians, brokers and technology vendors have a different responsibility: ensuring customers receive the information and services needed to make the transition. Readiness therefore extends beyond a firm's own operations team to the organisations supporting its transactions.

The background

The taskforce published its UK T+1 Implementation Plan in February 2025, identifying automation as an essential part of the transition. The plan sets out changes needed before the final switch, with some milestones falling well ahead of October 2027.

Experience in the US illustrates the potential cost of leaving too much work to people. Douglas says firms that had not automated adequately saw staffing costs rise by as much as 18% as they brought in additional resources to handle shorter processing windows.

Firms can develop their own automation or outsource it. The practical changes identified include automated confirmations, standardised messages and real-time reconciliation, each intended to remove manual steps from post-trade workflows.

Those tools depend on data quality. Straight-through processing requires accurate information to arrive where it is needed on time, making data governance part of the operational work rather than a separate technology concern.

Existing settlement failures also provide a starting point for preparations. Douglas urges firms to identify why transactions are late or fail under the current timetable and resolve those causes before they have less time available to investigate and correct them.

What people are saying

Writing for City AM, Douglas argues that extending operations teams' hours or employing more people is neither a sustainable nor a cost-efficient substitute for automation. His warning is directed at firms considering how to cover the gap between their current processes and the new deadline.

He says businesses should already know where manual interventions remain, why they are needed and whether they can be completed within T+1. Where those steps cannot fit, the requirement is to eliminate them rather than assume they can be accommodated after the switch.

Douglas also links weak automation and data controls to higher costs for managing exceptions, additional funding requirements and liquidity pressures. Foreign exchange can become more complicated when firms have less time to address problems that prevent settlement.

The consequences can extend to commercial relationships. A firm that repeatedly supplies incorrect information or misses deadlines adds costs elsewhere in the settlement chain, potentially damaging its reputation and its prospects of winning further business.

His preferred outcome is an uneventful transition, with firms having resolved their operational dependencies beforehand. He would like many businesses to be working to a T+1 timetable before it formally becomes a requirement, rather than first attempting it on implementation day.

What happens next

The first major deadline highlighted is 31 December 2026. By then, allocation and confirmation processing, where undertaken, should be completed as early as reasonably practicable and no later than 23.59 UK time on the trade date.

The same year-end milestone covers implementation of the Financial Markets Standards Board's core principles and templates for standing settlement instructions. It also applies to automation of securities lending recalls and return instruction flows, following International Securities Lending Association market practice.

End-to-end testing windows are due to open in February 2027. Meeting the December milestones is intended to leave firms ready to test the changes together, rather than still implementing the underlying processes when those windows become available.

Testing must cover dependencies between fund managers, custodians, administrators, brokers, banks and intermediaries. Firms using external technology providers also need to establish when their solutions will be available and when those systems can be tested.

From 2027, the taskforce will publish rolling three-month averages of CREST settlement rates. The post-transition settlement-rate target will use the average achieved over the preceding three months, giving firms a performance benchmark for the change.

Once T+1 is implemented, settlement instructions should reach the central securities depository as early as reasonably practicable and before relevant intermediary cut-offs. The final limit specified in the plan is 05.59 UK time on T+1.