For years, many post-trade processes have had something rather useful built into them: time. An issue identified late in the day could be investigated the following morning. A spreadsheet could be checked, a discrepancy reconciled, an email chased or an operational team could step in and resolve a problem manually.
T+1 changes that. The UK is due to move to a T+1 settlement cycle on 11 October 2027, and the FCA estimates that the change will reduce the time available to process transactions by around 80%. That is not a small adjustment to an existing timetable. It fundamentally changes the amount of tolerance firms have for avoidable delays throughout the trade lifecycle.
Processes designed around having time to recover from problems will suddenly have much less of it. For operations leaders, that makes the question of readiness much broader than whether existing systems can technically support the new settlement timetable.
There is an understandable temptation to frame T+1 as a speed challenge: can we complete the same process more quickly? That is certainly part of it, but simply asking people to work faster does not fix an operating model containing too many hand-offs, too many manual checks or too many points at which information leaves one system and needs to be re-entered into another.
The FCA has been clear that firms should review their end-to-end settlement arrangements and identify manual processes and blockages. It has also said that automation is likely to be critical for most firms making the transition,
That should encourage firms to look beyond the headline settlement date and into the machinery underneath it. Where does a process break? Where does a human need to intervene risking error and delay? Which calculations happen outside a core system? Which decisions depend on an experienced employee simply knowing what to do next?
Under T+2, some of these may have been manageable inefficiencies. Under T+1, they have the potential to become genuine operational risks.
Faster settlement also places greater importance on getting information right earlier in the process. An out-of-date data item, missing field or inconsistent identifier may sound mundane, but settlement problems rarely need to originate from something dramatic.
More often, a relatively small issue travels through the process until somebody has to stop and resolve it. Under T+1, there is far less time available when that happens.
This makes data validation and consistent application of business rules increasingly important. Firms need confidence that the data entering a process is complete, appropriate and being assessed against the correct rules before it moves on. Identifying the problem several stages later is becoming an expensive luxury.
Good operations teams resolve complex issues every day and human expertise will remain essential. The problem is when manual intervention becomes part of the normal operating model rather than the exception.
Rekeying information, manipulating spreadsheets, carrying out ad hoc reconciliations and moving between inboxes and systems all introduce small amounts of latency. Multiply that across hundreds or thousands of transactions and the effect becomes much more significant.
There is also a financial dimension. Following North America's move to T+1, PostTrade 360 reported anecdotal evidence that some firms increased operational headcount by up to 10%, while additional staffing costs may have reached 18% in some cases. The same analysis points to firms now looking towards technology modernisation and automation to reduce those costs.
The FCA has made a similar point for UK firms, warning that using additional staff to support manual arrangements can increase operational costs as well as the risk of late-settlement penalties.
Adding people may help an organisation get through a deadline. It is a much less attractive answer to a permanent change in the operating model.
Most organisations have operational logic that sits outside their core technology. It might be a calculation maintained in a spreadsheet, a macro created years ago, a workaround introduced to accommodate a system limitation, or a decision that depends on somebody knowing which exception applies.
These are effectively business rules, even if nobody calls them that.
The danger comes when important operational logic sits outside controlled systems. It becomes harder to monitor, harder to change consistently and harder to demonstrate exactly what happened after an event. T+1 raises the stakes because the opportunity to spot and correct an error later is reduced.
For firms also subject to the FCA's operational resilience regime, the broader direction is equally clear. Firms are expected to understand the people, processes, technology, information and third-party dependencies supporting important business services, identify vulnerabilities and demonstrate how they will remain within their impact tolerances. Control needs to be visible, not assumed.
As part of readiness planning, firms may want to ask:
A few uncomfortable answers now are probably more useful than reassuring assumptions in October 2027.
The answer is automation based on well-defined rules. A T+1-ready operating model does not necessarily require one enormous new platform. In many cases, the more practical answer will be to build a stand-alone rules system that plugs into your existing systems. That means accurate data entering processes earlier, clear and repeatable business rules, greater automation of predictable decisions, faster identification of exceptions and less dependence on routine manual intervention. It also means being able to change those rules without launching a lengthy development project every time the business needs to adapt.
This is where rules technology such as Heywood Idiom can play a role. Idiom is a low-code rules engine that allows organisations to turn business logic, calculations and decision-making into transparent, executable rules. It is vendor-agnostic, so it can be introduced alongside existing systems rather than requiring a wholesale re-platforming exercise.
That distinction is important. Firms do not necessarily need another transformation programme. They need to identify where their current model relies too heavily on time, people and workarounds, then remove those dependencies in a controlled way.
T+1 takes away much of the buffer that has allowed those weaknesses to remain hidden. The question for operational leaders is whether the operating model beneath settlement is genuinely ready to work at the speed the new regime will demand.
Start your T+1 planning with Heywood
If you are reviewing your operating model for T+1 and want to understand where rules-driven automation could reduce manual intervention, improve control and strengthen resilience, speak to Heywood.
We can help you identify the processes creating the greatest operational risk and explore where Idiom could work alongside your existing technology to support a more resilient T+1 operating model.
Talk to Heywood about your T+1 plans.
Source: https://www.fca.org.uk/news/blogs/t-plus-1-settlement-why-firms-should-act-now