In June 2018, SWIFT formally announced the timeline for migrating its cross-border payment and reporting messages from the legacy MT (Message Type) format to the ISO 20022 standard. The announcement set the stage for what would become the largest messaging standard migration in the history of international payments.
The Plan
SWIFT's migration plan called for a phased approach:
November 2022: Go-live for ISO 20022 messages (MX format) on the SWIFT network, beginning a coexistence period where both MT and MX formats would be supported November 2025: End of coexistence, after which only ISO 20022 messages would be accepted for cross-border payment and cash management messages
During the coexistence period, SWIFT would provide translation services between MT and MX formats, allowing institutions to migrate at their own pace while maintaining interoperability with those that had not yet upgraded.
Why ISO 20022
The move to ISO 20022 was driven by the need for richer, more structured data in payment messages. MT messages, some designed in the 1970s, carried limited information in relatively rigid formats. ISO 20022 offered structured fields for addresses, purpose codes, regulatory references, and other data elements that regulators and compliance teams increasingly required.
The standard also promised better interoperability with domestic payment systems, many of which had already adopted or were planning to adopt ISO 20022 - including TARGET2, CHAPS, and Fedwire.
Subsequent Delays
The original November 2022 start date was later delayed to March 2023, driven by the complexity of readiness across the SWIFT community and the impact of the COVID-19 pandemic on implementation timelines. The end of coexistence was similarly extended to November 2025.
Significance
SWIFT's announcement triggered a wave of investment across the global banking industry. Every institution participating in cross-border payments needed to assess, plan, and implement changes to their payment processing systems. The migration became one of the largest coordinated technology programmes in financial services history.
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