Binding dates kept arriving before the headline events firms filed them under

Five regulators set clocks this week, and in almost every case the date that bites first was not the headline event. ESMA's T+1 framework is the clearest example, but the pattern runs through Basel's G-SIB fix, AMLA's Frankfurt roundtables and the ISDA FX cutover. This is a read on how to calendar a week like this one.

• ESMA fixed 7 December 2026 as the first binding T+1 deadline for electronic, standardised and machine-readable allocation and confirmation messaging, almost a year before settlement shortens on 11 October 2027.
• Basel's G-SIB reporting and disclosure threshold rises from EUR 200 billion to EUR 350 billion in leverage ratio exposure measure from 2027, while annual-average indicator calculation is deferred to 1 January 2030.
• AMLA's in-person Frankfurt simplified-CDD expression-of-interest window closed 18 October 2026 at 23h59 CEST, with roundtables running 9 November to 2 December 2026.
• ISDA's 2026 FX Definitions take over in November 2027, after which the 1998 definitions cease to apply, with a SWIFT change request already submitted before the 4 June deadline.
• ABA, BPI, CBA and ICBA asked the Fed to move its 30 November stablecoin comment deadline to 29 January, a decision still pending.

Executive summary

ESMA confirmed the EU will move to T+1 settlement on 11 October 2027 and declared its regulatory framework complete with publication of the RTS and revised Guidelines on standardised procedures and messaging protocols. The first binding deadline falls earlier: from…

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