What T+1 means and what changes in the EU
A settlement cycle tells you how many working days pass between the trade date and final settlement. Final settlement is the point where cash and securities actually change hands. T+1 means settlement one working day after the trade. The EU runs on T+2 today, so a trade placed now settles two working days later.
ESMA (European Securities and Markets Authority, the EU’s financial markets regulator) has recommended 11 October 2027 as the switch-over date. The legal route runs through an amendment to CSDR (Central Securities Depositories Regulation, the EU rulebook for securities settlement) Article 5(2). That article currently requires T+2, and as a result the EU co-legislators have already agreed the change.
A shorter window cuts counterparty risk. After all, less time between trade and settlement means less time for something to go wrong. In addition, it ties up capital for a shorter spell, and it brings the EU into step with other major markets.
Who is already on T+1, and why it reaches you
North American markets moved to T+1 back in May 2024. That includes the United States, Canada and Mexico. Meanwhile, the United Kingdom and Switzerland are aiming for the same date as the EU, 11 October 2027, and the UK Treasury published its draft legislation in November 2025. Turkey, for its part, has set its own deadline for the end of 2026.
That spread is the reason this is not only a problem for large EU brokers. For instance, if your counterparty settles on an EU market, the shorter cycle pulls your data into the same rhythm. A smaller firm has to make sure its details line up along the chain just the same. Likewise, so does a non-EU company whose partners settle in the EU. This is the knock-on effect, where a rule in one jurisdiction reaches everyone who trades with that market’s participants.
Why a shorter window raises the stakes on data quality
T+1 takes half the settlement window away. As a result, your counterparty data has to be correct and machine-readable on the trade date itself. There is no longer a spare day to fix it by hand.
Settlement fails often trace back to something simple. In short, a counterparty cannot be pinned down to one clear identity. For example, the culprit might be a wrong or missing identifier. It might be standing settlement instructions that do not match. Similarly, it might be a legal name spelled two different ways across two systems. Under T+2 you had another day to catch that. However, under T+1 the buffer is gone, so a small mismatch turns into a failed settlement. As a result, that brings penalties and extra cost.
Why the LEI exists
This is where the LEI (Legal Entity Identifier, the global 20-character code that identifies a legal entity) earns its keep. The LEI was created after the 2008 financial crisis, on a mandate from the G20 and the FSB (Financial Stability Board, the body that coordinates global financial regulation). The purpose was precise. Regulators wanted a way to identify every party to a financial transaction consistently, because opaque counterparties had turned out to be a systemic risk. In other words, the LEI exists to solve the exact problem that a shorter settlement cycle now brings into sharper focus.
The system behind it is run by GLEIF (Global Legal Entity Identifier Foundation, the not-for-profit that governs the Global LEI System). GLEIF publishes the reference data for every LEI openly in the Global LEI Index, and it maintains the data quality of that record. Behind each code, therefore, sits a verified, openly available entity record, such as the legal name, the registered address and the ownership links. Because that record is open and standardised, every party in the chain can resolve a counterparty to the same verified entity, in a machine-readable form.
The LEI as the counterparty anchor
That is exactly what a compressed timeline needs. In post-trade messaging, such as the ISO 20022 and ISO 15022 standards, the LEI ties each trade to the right legal entity. As a result, when counterparty data carries the same code all the way along the chain, trades can be matched reliably. That holds across separate systems and across borders.
There is an honest distinction to draw here. T+1 does not, on its own, require a company to hold an LEI. Instead, the actual requirement comes from elsewhere. For example, under MiFID II (Markets in Financial Instruments Directive) and EMIR (European Market Infrastructure Regulation), a participant trading on a regulated market needs an LEI anyway. Moreover, the LEI is not the only identifier in the chain either. It sits alongside operational bank codes and others. Its job is to tie them together at the legal entity level.
So T+1 creates no new LEI obligation. Instead, what it does is raise the stakes on keeping the entity data you already rely on clean. In practice, the LEI is the standard way to hold that together across the chain, precisely because GLEIF keeps the underlying record open and verified.
What to do now
ESMA has been clear that 2026 is the critical year for preparation. The first regulatory deadline falls on 7 December 2026, and it covers allocation and confirmation processes. After that, the full move follows on 11 October 2027.
In practice, that means looking at your entity data now rather than in the autumn of 2027. First, check that your LEI is active and current, because a lapsed record will not match cleanly. Next, make sure your reference data stays up to date, such as your legal name and address. In addition, check the LEI status of your main counterparties too, so a failure at the other end of the chain does not catch you out.
If you do not yet hold an LEI, you can register one with us. If yours is coming up for renewal, keep it active. You can also check counterparty codes in our LEI search.