Payment Radar
Nacha IAT Definition Change Takes Effect Sept. 18, 2026
Nacha's new rule clarifying the definition of International ACH Transactions (IATs) takes effect on September 18, 2026.
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What changed
Nacha (The US industry association that governs the ACH network’s rules and same-day ACH.) updated the definition of International ACH Transactions (ACH: Automated Clearing House, the US bank-to-bank electronic transfer network run by Nacha for payroll, direct deposit, and business payments.) to provide greater precision in identifying cross-border payments. This rule takes effect on September 18, 2026. The clarification means some payments previously treated as domestic may now be classified as international, or vice versa. This reclassification directly impacts how organizations handle compliance, onboarding, and screening for these transactions. Additional IAT-related rule changes are scheduled for March 2027 and March 2028, signaling a multi-year shift in how cross-border ACH activity is managed.
Why a business should care
Accurate IAT classification is critical for regulatory compliance and fraud prevention. Misclassifying a payment can trigger stricter compliance, onboarding, and screening requirements for merchants and financial institutions. Non-compliance with updated IAT classification rules may lead to regulatory penalties, increased compliance screening volumes, and operational disruptions in cross-border payment processing. For businesses handling international transactions, getting the classification right ensures smoother operations and avoids costly compliance failures.
Who it affects
US merchants, financial institutions, payment processors, and third-party service providers involved in cross-border ACH transactions. Any organization that originates, processes, or settles ACH payments with international characteristics will need to adjust their workflows.
What to consider doing
Pull your current payment classification logs and cross-reference them against the new IAT definition criteria. Identify any transactions that may now fall under the updated international classification and update your internal tracking and compliance screening processes accordingly.
Uncertainty and risks
The primary risk is non-compliance with updated IAT classification rules, which may lead to regulatory penalties, increased compliance screening volumes, and operational disruptions in cross-border payment processing. As additional rule changes are scheduled for 2027 and 2028, businesses should remain prepared for further adjustments to their cross-border payment workflows. The exact volume of reclassified payments and the specific compliance burden for each organization will depend on their transaction patterns and current processes.
Updated Payment Radar editor
Nacha's Upcoming Rules Refresh Is All About Improving Clarity
There has since been a further development.
Nacha confirms the new sanctions return code R90 will take effect in March 2028, providing the specific detail requested in the open thread. The article also details other rule changes regarding IAT definitions and funds availability.
Source: Nacha's Upcoming Rules Refresh Is All About Improving Clarity — Payments Journal (2026-09-10)
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