After Nacha Phase 2: Is Your ACH Fraud Monitoring Actually Working?

After the Deadline Comes the Real Test

For months, financial institutions have focused on preparing for Nacha’s expanded ACH fraud monitoring requirements. Policies were reviewed, procedures were updated, and teams worked to ensure the necessary controls were in place by the effective date.

Now that the deadline has passed, the more important question is no longer whether an institution can demonstrate compliance. It is whether the monitoring process is actually working as intended.

A program may satisfy a requirement on paper and still fail to identify meaningful risk in practice. Effective ACH fraud monitoring should help an institution recognize unusual activity, investigate it consistently, document its decisions, and refine its processes over time. The real test begins after implementation, when banks must determine whether their monitoring is producing useful insights or simply adding more alerts and manual work.

Compliance is the starting point. The ultimate goal is to protect customers, reduce losses, and give operations teams a repeatable way to identify and respond to suspicious ACH activity.

Fraud Continues to Evolve

Criminals aren't standing still.

Today's fraud schemes include:

• Business email compromise
• Account takeover
• Social engineering
• First-time originator fraud
• Elder financial exploitation
• Synthetic identities
• Mule accounts

Modern fraud rarely follows one predictable pattern.

Instead, it blends multiple behaviors that require banks to evaluate context—not simply thresholds.

Five Questions Every Operations Team Should Ask

1. Can we explain why an alert was generated?

Alerts without context create unnecessary work.

Staff should immediately understand:

• what happened
• why it matters
• what should be reviewed next

2. Are we identifying unusual behavior—not just large transactions?

Some of the highest-risk transactions aren't the largest.

Changes in timing, counterparties, frequency, and historical behavior often provide earlier warning signs.

3. Can investigators document their review?

Monitoring doesn't end with an alert.

Institutions need repeatable investigation workflows, documentation, and consistent decision-making.

4. Are false positives consuming staff time?

Compliance teams remain lean.

Every unnecessary alert reduces the team's ability to investigate meaningful activity.

5. Can we demonstrate our process to examiners?

Regulators increasingly expect documented, risk-based monitoring—not simply software.

Your institution should be able to demonstrate:

• monitoring procedures
• review process
• escalation process
• documentation

Compliance Is Only the Starting Point

The strongest fraud monitoring programs don't exist because regulations require them.

They exist because fraud losses continue to increase.

Effective monitoring protects:

• customers
• employees
• reputation
• shareholder value

The institutions that continuously refine their monitoring processes—not simply check a compliance box—will be far better positioned as fraud continues to evolve.

Interested in learning how community banks are approaching risk-based ACH fraud monitoring? Finovifi's ACH RiskLens was designed specifically to help financial institutions identify anomalous ACH activity, document investigations, and support repeatable fraud monitoring workflows aligned with today's operating environment.