GLOSSARY
MT103
The legacy SWIFT FIN message used for single customer credit transfers — the workhorse format for cross-border bank-to-bank wire payments.
MT103 is the SWIFT FIN message type used for single customer credit transfers — the workhorse format for cross-border bank-to-bank wire transfers. It carries the originator, beneficiary, intermediary banks, amount, value date, charges, and remittance information for a single payment.
Why it matters
MT103 has powered most cross-border wires for decades, but SWIFT is migrating its FIN traffic to ISO 20022 (pacs.008 for customer credit transfers) on a coexistence schedule that runs into November 2025. Banks must support both formats during coexistence and progressively deprecate MT103.
Because MT103 fields are constrained, several long-running pain points — sparse remittance data, opaque charge handling, structured originator information — only get fully addressed under ISO 20022. For institutions exporting payment files from ERPs and treasury systems, the migration affects formats, mapping, and downstream reconciliation workflows. Pair this with SWIFT GPI to retain end-to-end tracking and structured fee disclosure.