On paper, the global financial system is rapidly converging toward a one-day trade settlement cycle. Today, approximately 75% of world equity market capitalisation, representing roughly $140 trillion in assets, already settles on a T+1 or faster basis. This momentum has been driven by major early movers including the United States, Canada, India, and China, which operates on a T+0 mechanism.
The next major milestone is set for October 11, 2027, when a coordinated migration across 30 countries in Europe, the United Kingdom, and Switzerland will expand T+1 coverage to 90% of global market cap. Yet, while these top-line statistics give the impression of seamless global alignment, looking beneath the surface reveals a far more complex and fragmented operational reality.
Our Director, Sybille Mueller, checked into the latest Sibos debate on this topic and here is what stood out for her.
In practice, market participants operate in a multi-speed world where T+2, T+1, and experimental T+0 mechanisms coexist simultaneously. This fragmentation introduces significant cross-border friction, particularly across regulatory and structural boundaries.
A prime example is the upcoming European migration, which requires aligning 30 jurisdictions, 11 distinct currencies, and over 30 Central Securities Depositories (CSDs) around a single point in time. Compounding this complexity is a fundamental regulatory misalignment: in both the EU and the UK, formal regulatory mandates strictly bind transactions that are traded on a trading venue and settled on a local CSD. Off-venue trades fall outside formal regulatory mandates. To prevent market confusion, industry groups, such as the UK Accelerated Settlement Task Force and the EU T+1 Decision Committee, have had to establish voluntary market conventions to maintain parity between on-venue and off-venue transactions.
When polled live during the panel on where the most severe operational bottlenecks would occur, the Sibos audience delivered a clear verdict: pre-trade and middle-office processing, FX execution, and misaligned fund settlement cycles were identified as the primary operational threats.
Intriguingly, actual settlement efficiency and intraday liquidity scored among the lowest concerns (~8%). This reveals that market participants trust the underlying settlement engines; their real anxiety lies in the pre-trade and middle-office plumbing that feeds those engines.
Accelerating the settlement timeline compresses the entire post-trade lifecycle, exposing several operational pressure points:
Reflecting on India’s transition to T+1 across 2023 and 2024 offers invaluable guidance for markets currently preparing for migration. India’s experience demonstrated that while upgrading technology and software systems is non-trivial, the far greater challenge lies in shifting participant mindsets, operational workflows, and cross-border behaviours.
To manage risk, India avoided a “Big Bang” deployment in favour of a phased rollout spanning four quarters. India coexisted across T+2 and T+1 for a full year, initially migrating less-traded securities before transitioning actively traded, foreign-investor-heavy equities in the final block once market participants had gained practical operational experience.
Crucially, early adopter data highlights a key operational trap: institutions often achieve high settlement efficiency during the initial weeks of go-live through intense manual effort. However, if permanent end-to-end automation is not implemented, efficiency frequently degrades three to four months later as temporary staff are reassigned to other priorities.
To preserve market efficiency, market infrastructures are implementing targeted operational enhancements. For example, Target2-Securities (T2S) in Europe is introducing three key adjustments: postponing the first night-time settlement window to allow more instructions to flow in, adding a later partial-settlement sequence, and creating time separation between night-time settlement cycles so participants can process intermediate outputs.
Additionally, T2S is establishing a “gating event” that allows participants to flag Securities Financing Transactions (SFTs) to hold and settle at 11:00 CET, mitigating intraday liquidity strains and preventing settlement deadlocks.
Institutions must also leverage intermediate guardrails rather than focusing solely on the final migration date. A critical checkpoint for European markets is December 6, 2026, which mandates trade-date allocation and confirmation by 11:00 p.m. CET on trade date.
As the global race toward T+1 accelerates, the panel called on market participants to take immediate action across three core imperatives:
