Treasury Intelligence Solutions (TIS) has issued a warning to corporate treasury, finance and IT teams: ISO 20022 is no longer a bank-only issue, and companies treating it as a simple messaging upgrade risk payment delays, rejected transactions, more manual intervention and reconciliation problems.
The pressure comes from SWIFT’s phase-in of ISO 20022 as the sole standard for interbank payment instructions. From November 2026, unstructured address data will no longer be accepted for many cross-border payments, MT101 payment initiation messages will be retired, and the high-value US systems Fedwire and CHIPS will move to full enforcement. Non-compliant cross-border payments will be rejected.
Readiness is patchy. In early 2025, two years into implementation, nearly a quarter of corporate respondents were unaware of ISO 20022, and half of those aware had not started preparing.
“November is closer than most organizations realize,” said Jonathan Paquette, chief of strategy at TIS. “With the deadline fast approaching and limited resources over the summer, many corporates are turning to partners like TIS to leverage proven technology and expertise to accelerate their ISO 20022 readiness. The priority now is acting on data quality and testing to ensure payments don’t fail when the standard goes live.”
ISO 20022: What It Means
The effects are already showing, according to TIS. Payment rejections and delays are rising where address data, regulatory fields or counterparty details fail enhanced validation. Manual intervention is climbing as exceptions land back with treasury and operations teams. Cash visibility and reconciliation are under strain as reporting formats shift unevenly across banks, and bank-by-bank interpretations add complexity.
The deadlines keep coming. Legacy exception and investigation messages retire in 2027, and MT9xx statement and reporting messages phase out in favour of ISO 20022 CAMT messages through 2027 and 2028.
In a new whitepaper, TIS urges companies to avoid patchwork fixes that solve today’s rejections while creating tomorrow’s risk. Its advice: define shared ownership across treasury, compliance and IT; review message format coverage across payment and reporting flows; align ERP, TMS and bank interface capabilities; strengthen master data governance; and test validation under real conditions across banks and regions. TIS is also offering a personalised ISO 20022 Health Check to flag readiness gaps.
TIS’s cloud platform handles $80 billion in daily cash management and $2.7 trillion in annual transaction volume for hundreds of clients worldwide.
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