Preparing for the UK's T+1 settlement transition

The UK's move to T+1 settlement will reduce the time between trade execution and settlement from two business days to one. The change affects a wide range of post-trade activities, including trade allocation, confirmation, settlement instruction management and exception handling, all of which will need to be completed within a shorter timeframe than firms operate under today. The Financial Conduct Authority (FCA) expects firms to be implementing the changes needed to support the transition and preparing to test those changes ahead of implementation in October 2027. 

Firms that completed mobilisation activity early are now focusing on process changes, operational testing and third-party engagement, while others are still assessing the changes required across their businesses. The FCA's recent engagement with market participants suggests that, although progress has been made across much of the industry, some organisations remain significantly less advanced, particularly buy-side firms, in their preparations and may need to accelerate implementation activity to meet future milestones. 

Operational changes required for T+1 settlement

Trade allocations, confirmations and settlement instructions all need to be completed earlier under T+1 than many firms currently achieve today. Under the UK Accelerated Settlement Taskforce's Code of Conduct, allocations and confirmations should be completed by the end of trade date (T+0), with settlement instructions submitted by 6am on T+1. While many firms already meet the proposed timelines as part of normal operations, others continue to rely on manual processes or end-of-day activity that leaves less room to accommodate delays, corrections or missing information. 

Recent industry discussions have focused on areas including trade matching, allocation timeliness and the management of standing settlement instructions, all of which play a role in determining whether transactions can settle successfully within a one-day cycle. Firms are also reviewing how exceptions are identified and escalated, particularly where resolution currently depends on manual intervention or communication between multiple parties.

Rather than introducing entirely new processes, many organisations are assessing whether existing arrangements can consistently support the deadlines expected under T+1. In practice, this means understanding where delays occur today, what causes them and whether they can be addressed before industry testing begins.

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Managing third-party dependencies

Feedback gathered by the FCA suggests that many firms remain reliant on third parties for key aspects of their T+1 preparations, particularly where settlement activity is supported by custodians, fund administrators or external technology providers. Several firms have indicated that they are still waiting for more detailed information on implementation plans, testing approaches and planned operational changes, making it difficult to assess whether dependencies outside their direct control will be ready in time. 

This is likely to be a greater consideration for firms with complex operating models or multiple service provider relationships. Although individual organisations may be progressing well with their own programmes, settlement outcomes will ultimately depend on all parties being able to operate within the same compressed timetable. Firms therefore need a clear understanding of which activities sit with external providers, what assumptions those providers are working to and how any issues identified during testing will be escalated and resolved.

Settlement performance and data quality under T+1

Settlement failures are receiving increased attention as firms assess readiness for T+1. The shorter settlement window means issues that currently have time to be investigated and corrected may become more difficult to resolve before settlement deadlines are reached.

The FCA has highlighted several recurring causes of settlement failures, including settlement instruction mismatches, stock availability issues and inventory management challenges. Firms are expected to understand the drivers behind failed settlements within their own organisations and demonstrate how those issues are being monitored and addressed. 

This is leading many organisations to review the management information used to monitor settlement activity, alongside the quality of the data supporting post-trade processes. Understanding where settlement failures occur, how frequently they occur and what factors contribute to them can help identify weaknesses that may become more pronounced under T+1.

Many of the issues being examined as part of T+1 programmes are not new. Delayed allocations, inaccurate settlement instructions and poor-quality reference data can already affect operational performance today. The move to a shorter settlement cycle is simply placing those issues under greater scrutiny.

The role of automation in T+1 readiness

Markets that have already adopted T+1 have demonstrated the role automation can play in supporting settlement efficiency and operational resilience. Following North America's transition in May 2024, industry participants reported higher same-day affirmation rates and improved settlement performance, while firms making greater use of automation experienced lower increases in operating costs compared with less automated peers. Automated processes provide greater consistency, reduce reliance on manual intervention and allow issues to be identified earlier in the settlement lifecycle.

The FCA has encouraged firms to consider whether existing manual processes are compatible with a one-day settlement cycle and has highlighted automation as one of the ways firms can improve processing capability and operational resilience. 

The changes required will differ between organisations. Some firms may focus on improving trade matching and settlement instruction management, while others may prioritise broader process redesign or enhancements to existing technology platforms. Decisions will depend on the nature of the business and the maturity of existing operations, but firms are ultimately working towards the same outcome: reducing the risk that manual processes or operational bottlenecks delay settlement activity.

Preparing for industry testing ahead of October 2027

Industry testing is expected to begin next year, requiring firms to demonstrate that operational and technology changes can function effectively alongside the wider market. The focus of many programmes is therefore widening beyond implementation activity to include process validation, testing plans and operational readiness assessments. 

Additional industry support has also become available in recent months. In September, the UK Accelerated Settlement Taskforce's Risk and Compliance Workstream published a T+1 Implementation Toolkit containing readiness scorecards, implementation checklists, control expectations and procedural guidance designed to help firms assess progress and identify any gaps in their preparations.

As firms continue their preparations, key considerations include:

• Whether post-trade processes can operate consistently within a one-day settlement cycle
• Where manual intervention remains a feature of settlement activity
• Whether dependencies on custodians, administrators and technology providers have been fully assessed
• How settlement failures are monitored, analysed and escalated
• Whether management information provides sufficient visibility over operational performance
• How testing plans align with wider industry milestones and market expectations
• Where automation or process changes could improve efficiency and reduce operational risk

The FCA's recent observations suggest that implementation timelines remain achievable for firms that continue to progress planned changes, engage with third parties and address operational weaknesses before testing begins. Organisations that understand their settlement performance, have visibility over external dependencies and can demonstrate that revised processes operate effectively are likely to be better positioned for the UK's October 2027 T+1 settlement transition. With industry testing approaching, firms should now be focused on validating operational readiness and addressing any remaining barriers to settlement efficiency.

For more information on the UK's transition to T+1 settlement, contact Rebecca Deane.