"MX" is SWIFT's internal label for ISO 20022 XML messages, contrasted with "MT" for the legacy fixed-format FIN messages (MT103, MT202, MT940, etc.). The MX migration on the SWIFT network is governed by the CBPR+ usage guidelines and runs in a coexistence window from 2023 to 2027.
Key dates: March 2023 — MX live on SWIFT FINplus, MT remains active. November 2025 — first FI types lose MT103 outbound. November 14, 2026 — full structured-address enforcement and MT103 fully deprecated for cross-border. Late 2027 — MT removed from FIN for the migrated message types.
The MX naming scheme is identical to ISO 20022 — pacs.008 (financial-institution-to-financial-institution credit transfer), pacs.009 (financial-institution credit transfer), pacs.002 (FI-to-FI payment status), camt.054 (notification), camt.053 (statement). Customers see pain.001 / pain.008 / camt.053 / pain.002; banks see the pacs.xxx + camt.xxx sub-network.
iso-compliant emits the customer-facing pain.001 / pain.008 envelopes that banks then translate into the inter-bank pacs.xxx flows.