Preparing for Nacha’s 2026 fraud overhaul

February 19, 2026

Nacha’s 2026 fraud rule changes mark a decisive shift in how the ACH network approaches fraud prevention.

The long-standing “commercially reasonable” benchmark is being replaced with a clear “risk-based” standard, requiring financial institutions (FIs) to align fraud controls with their specific exposure and transaction profiles. With billions lost annually to ACH fraud, regulators are signalling that legacy controls are no longer sufficient.

Hawk AI, which helps FIs and regulated entities with their AML, screening, fraud and FinCime process, recently explored how to assess if fraud prevention systems are fit for purpose.

Historically, Nacha rules were geared towards preventing unauthorised debit transactions, with return rate thresholds acting as a primary safeguard, Hawk said. However, these controls did little to address credit-based scams, where funds are pushed out of accounts under false narratives. Business Email Compromise (BEC) and payroll diversion schemes exposed a critical gap: payments were technically authorised by the customer, even though deception drove the decision. Under the updated framework, such “false pretences” are explicitly within scope.

The rollout will take place in two phases. From 20 March 2026, enhanced fraud monitoring applies to all ODFIs and high-volume non-consumer originators, TPSPs and TPSs, as well as large RDFIs monitoring incoming credit fraud. From 19 June 2026, the requirements extend to all remaining participants.

Institutions must also conduct annual reviews of their fraud monitoring procedures and adopt standardised payment descriptions such as “PAYROLL” and “PURCHASE” to improve transparency.

While requirements for WEB debit screening, Micro-Entries and account validation remain unchanged, the broadened scope and mandatory risk-based framework demand more structured, auditable controls.

Hawk positions its AI-driven fraud monitoring platform as aligned with Nacha’s updated requirements, covering account takeover (ATO), unauthorised debits, authorised push payment (APP) scams and mule network detection.

By analysing behavioural patterns and anomalies in real time, the platform aims to help institutions demonstrate risk-appropriate controls and respond before fraudulent transactions settle. The company states that implementation can take as little as 12 weeks.

For more insights, read the full story here.