For years, ACH fraud decisions focused on one question: Was the payment authorized? If the credentials matched and authentication passed, the transaction typically moved forward.

Nacha’s 2026 rule changes move the industry beyond that model. Institutions are now expected to evaluate customer intent, not just authentication. Payments that appear legitimate on the surface can still fall under fraud monitoring requirements if they were induced through deception.

This shift introduces shared responsibility across the ACH network. ODFIs, RDFIs, fintech platforms, and third-party senders are all expected to maintain documented, risk-based procedures to detect scams such as business email compromise, vendor impersonation, and payroll diversion.

This guide explains what the new mandate requires and how fraud, risk, and compliance teams can prepare without disrupting legitimate payment flows.

Inside the guide

• A clear breakdown of the False Pretenses standard and what it means operationally
• The timeline of 2026 requirements and how the rules phase in across the network
• How responsibilities differ for ODFIs, RDFIs, fintechs, and third-party senders
• Practical controls for detecting scams that appear technically authorized
• Best practices for documenting a risk-based “standard of care”
• A step-by-step 2026 readiness roadmap for fraud and compliance teams

If your institution sends, processes, or receives ACH payments, these rule changes affect your monitoring responsibilities.

Download now to understand what’s changing and how to prepare for the Nacha 2026 mandate.