ACH can look clean, cheap, and simple from the outside, but the real risk lives in authorization quality, fraud monitoring, return exposure, transaction context, and operational controls. The 2026 Nacha rule changes make it clear that ISVs, platforms, payment companies, payroll providers, and embedded finance teams cannot treat ACH as a low-cost payment feature without a real risk strategy behind it.

Everyone wants frictionless merchant onboarding until bad merchants, transaction laundering, scam activity, and card-brand monitoring programs start asking uncomfortable questions. Fast growth without real merchant monitoring is not innovation — it is future compliance pain with a cleaner user interface.