Accelerated Settlement and the Derivatives Fault Line: Three Gaps the T+1 Transition Makes Visible

The global movement towards T+1 securities settlement is being narrated, across regulatory documents and industry roadmaps alike, as an efficiency story. Timelines compress, counterparty credit risk diminishes, and capital markets modernise. What this narrative leaves unexamined is a structural question of a different order: the derivatives market has never resolved the foundational tension between the speed at which risk is created and the speed at which it is extinguished. A comparative report published by Norton Rose Fulbright in June 2026, surveying the United States, United Kingdom, European Union, Canada, Australia and Saudi Arabia, provides the empirical cartography from which that question can no longer be deferred. Read alongside the derivatives regulatory architecture that the report’s scope does not include, the findings point towards three fault lines whose convergence deserves sustained analytical attention.

I. Margining Frameworks Calibrated for a World That Is Ending

The first fault line runs through central counterparty risk management. T+1 does not, as a matter of legal scope, apply directly to OTC derivatives. Its application is confined to the securities that collateralise those derivatives. Government bonds, equities held as variation margin, exchange-traded fund units posted as initial margin: these are the instruments whose settlement cycle is being compressed. The consequence is that when the securities leg settles in one business day, collateral management workflows that were architecturally designed for a two-day window face an intraday liquidity demand that existing margining frameworks were never calibrated to absorb.

The Norton Rose Fulbright report is candid on the systemic implications. The SEC’s T+1 Adopting Release acknowledged that a further transition to T+0 would strain multilateral netting, securities lending practices, money settlement systems, and corporate action processing. The report’s Saudi Arabia section notes that Muqassa, the kingdom’s central counterparty, would need to recalibrate margin, stress-testing and liquidity contingency frameworks in accordance with Committee on Payments and Market Infrastructures – International Organization of Securities Commissions (CPMI-IOSCO) Principle 6 on margin. The UK’s Accelerated Settlement Taskforce recommended that boards ensure treasury and funding desks understand the impact on pre-funding requirements and the potential for funding gaps. These observations, drawn from three distinct regulatory traditions, converge on a single structural diagnosis: the CCP margining architecture was built for T+2, and the process of rebuilding it for shorter cycles has not yet been undertaken with the rigour that the derivatives dimension of the problem requires.

The question that emerges is one that European Market Infrastructure Regulation’s (EMIR) bilateral margining rules for non-cleared derivatives and the clearing obligations for standardised contracts have not yet been asked to answer. At what settlement velocity does the window for margin calls, collateral substitutions, and securities lending recalls become so compressed that existing models begin to systematically underestimate intraday exposure? It is submitted that the relevant regulatory bodies, including European Securities and Markets Authority (ESMA) and the Commodity Futures Trading Commission (CFTC), should treat this as a priority supervisory exercise before October 2027.

II. Foreign Exchange as a Derivatives Market in Its Own Right

The second fault line is visible in the report’s treatment of FX timing pressures, and it runs deeper than the operational literature tends to acknowledge. FX is routinely described, in the context of T+1 preparation, as a funding mechanism: the currency trade that must be executed to fund the securities purchase before the settlement deadline arrives. That framing captures one dimension of the problem. It leaves unexamined a dimension that is analytically prior and normatively more consequential.

FX is a derivatives market in its own right. The instruments used to manage FX settlement risk, including FX forwards, cross-currency swaps and FX swaps, are derivatives contracts governed by International Swaps and Derivatives Association (ISDA) master agreements, subject to margin requirements under the relevant variation margin rules, and exposed to counterparty credit risk in ways that are directly affected by the speed of the underlying securities settlement cycle. When the Investment Association’s January 2026 roadmap identifies the structural mismatch between T+1 securities settlement and the T+2 standard FX settlement cycle as a critical operational risk, it is identifying, in operational language, a regulatory gap in the OTC derivatives framework.

The BIS Innovation Hub’s Project Meridian FX and Project Rialto represent early experiments in bridging that gap through technological means. Project Meridian FX explores the use of a synchronisation operator to reduce the speed, cost and risk of FX settlement, while enabling interoperability between traditional and distributed ledger infrastructure. Project Rialto integrates instant payment systems with an FX module deploying automatic settlement of wholesale central bank digital currency. These initiatives are significant, and they are at an early stage. The Committee on Payments and Market Infrastructures’ (CPMI) cross-border payments monitoring surveys confirm that the G20’s quantitative targets for speed, cost and transparency in cross-border payments are unlikely to be met by end-2027 without further jurisdictional implementation.

It can be argued that the FX derivatives market must be explicitly included in any regulatory roadmap for shortened settlement cycles. The present approach, which treats FX settlement risk as a bilateral collateral management problem to be resolved through custodian outsourcing and pre-funding arrangements, is insufficient for a financial system in which cross-currency collateral posting is systemic.

III. Settlement Finality, Tokenized Collateral, and the Recognition Gap

The third fault line is the most consequential for the medium-term trajectory of derivatives market regulation. The report’s jurisdictional survey reveals, with cumulative force, the absence of any coherent legal framework for the cross-border recognition of settlement finality based on distributed ledger technology (DLT). This is a gap with immediate derivatives market consequences, and the pace of market development makes deferral increasingly costly.

In December 2025, the CFTC’s Tokenized Collateral Advisory permitted the use of tokenized US Treasuries and money market fund units as collateral for futures and swaps transactions. In May 2026, DTCC announced a production timeline for DTC’s tokenization service for security entitlements, with initial trades planned for July 2026 and a full-service launch in October 2026. The NYSE and Nasdaq are pursuing SEC approval for near-24-hour trading on tokenized equity platforms. The infrastructure of tokenized collateral posting in derivatives markets is being assembled in real time.

The legal architecture to support that infrastructure is not keeping pace. The CPMI-IOSCO guidance on settlement finality for DLT-based systems emphasises that a well-reasoned legal opinion is necessary to establish the precise point at which finality takes place, particularly for cross-border arrangements where legal frameworks remain unharmonised. The UK’s Property (Digital Assets etc) Act 2025, which received Royal Assent in December 2025, establishes that crypto tokens constitute personal property under English law. The Settlement Finality Regulations 1999 have not yet been amended to translate technical DLT finality into legal finality, and HM Treasury and the Bank of England have acknowledged the legislative gap. The EU’s proposed Regulation on Settlement Finality, published as part of the Commission’s December 2025 MISP package, would define the moment of finality for DLT-based settlement systems and lay down a framework for the registration of third-country settlement systems; the proposal remains subject to legislative review. IOSCO’s Tokenization of Financial Assets report of November 2025 observed wide variation in jurisdictional approaches to recognising DLT-based token ownership and transfer. No multilateral treaty on cross-border recognition of blockchain settlement finality currently exists.

For derivatives market participants, the consequences of this gap are material. Collateral posted as tokenized securities in satisfaction of a margin call must achieve legal finality at a moment that is operationally certain and legally recognised across the governing law of the master agreement, the law of the collateral arrangement, and the law of the settlement system. The convergence of these three legal frameworks is a precondition for the systemic deployment of tokenized collateral in derivatives markets. It has not been achieved.

IV. The Reform Agenda That T+1 Makes Visible

Three propositions follow from this analysis.

First, EMIR’s requirements for cleared and non-cleared derivatives, including the bilateral margining rules operative since 2017, should be stress-tested against a T+1 collateral environment as a matter of supervisory priority. The supervisory exercise should be conducted jointly by ESMA, the Bank of England, and the CFTC, with findings published before the October 2027 transition date.

Second, FX derivatives market regulation must be explicitly mapped onto the T+1 policy agenda. The FSB and CPMI should extend their cross-border payments work to address the derivatives-specific dimensions of that exposure, including the treatment of FX forwards and cross-currency swaps in a T+1 funding environment.

Third, cross-border legal recognition of DLT settlement finality should be treated as a priority infrastructure question for derivatives market regulation. The FSB should convene a multilateral working group with an explicit mandate to develop a framework for cross-border recognition of DLT-based settlement finality, drawing on the existing CPMI-IOSCO Principles for Financial Market Infrastructures as a foundation.

The compressed clock of T+1 is, in the end, a stress test that the derivatives market did not know it was sitting. The results are already instructive, and the time to act on them is before October 2027.

Ligia Catherine Arias-Barrera is Professor-Researcher in Commercial Law at Universidad Externado de Colombia, where she leads CERES (Centro de Estudios Regulatorios de la Empresa Sostenible), and Invited Lecturer for Financial Derivatives at Queen Mary University of London. She is the author of Regulation and Supervision of the OTC Derivatives Market (Routledge, 2018) and The Law of ESG Derivatives (Routledge, 2025).