Small FIs & the New NACHA Fraud Monitoring Rules (Phase 1)

What is up fraud fighters, and welcome to Fraud Forward!

Alright, today we’re diving into something that has been popping up in conversations with fraud leaders, compliance teams, and operations executives across the industry.

The NACHA Fraud Monitoring Rules.

If your institution processes ACH credits or debits, you’ve probably heard about the updated NACHA ACH fraud monitoring rule and the March 2026 ACH deadline. And a lot of teams are asking the same question right now.

Do we need to buy new technology?
Do we need to rebuild our entire fraud monitoring program?

Let me just assure you. In most cases, the answer is no.

What NACHA is really asking institutions to demonstrate is something much more practical. They want financial institutions to show that they understand their ACH fraud exposure and that they have risk-based fraud monitoring aligned with that exposure.

That’s the real shift.

In this episode, I walk through NACHA’s two-phase implementation timeline and what Phase 1 NACHA compliance actually means for small banks and credit unions.

We talk about how to conduct a defensible ACH fraud risk assessment, how to approach transaction baseline development, and how to document monitoring controls in a way that examiners will understand.

And I also spend some time talking about vendor conversations. Because one thing I’m seeing right now is a lot of marketing claims around “instant NACHA compliance,” and institutions need to slow down and ask better questions.

The goal here is not to overspend or overbuild systems.

The goal is defensible monitoring that actually matches your institution’s ACH risk profile.

What you’ll hear in this episode

• How the NACHA Fraud Monitoring Rules change expectations for ACH fraud monitoring requirements
• What the NACHA ACH fraud monitoring rule means for financial institutions
• The timeline for Phase 1 NACHA compliance and the March 2026 ACH deadline
• How to conduct an ACH fraud risk assessment and develop transaction baselines
• Vendor due diligence questions institutions should ask when evaluating ACH monitoring tools

You should listen to this episode if

• Your institution processes ACH credits or debits
• You are preparing for the March 2026 ACH deadline
• You oversee fraud monitoring or compliance programs
• You are responsible for ACH governance framework oversight
• You want to implement risk-based fraud monitoring without unnecessary cost

If you liked this episode, be sure to subscribe and review the podcast on iTunes, Spotify, YouTube, or wherever you listen to podcasts. It really helps more fraud fighters find these conversations.

Episode notes & key takeaways

Before we double click on the notes, I just want to say that my marketing team told me I need to structure these notes a certain way in order for people to find my podcast. The below is a bit of that 😀.

NACHA fraud monitoring rules require risk-based alignment

For years, a lot of institutions interpreted “commercially reasonable detection systems” as meaning they needed to buy a specific fraud monitoring tool.

The NACHA fraud monitoring rules move the industry away from that thinking.

Instead, NACHA is emphasizing risk-based fraud monitoring.

That means institutions must demonstrate that they understand their ACH fraud exposure and have monitoring controls aligned with that exposure.

In practice, that usually means documenting:

• A formal ACH fraud risk assessment
• Monitoring aligned with transaction exposure
• Defined fraud response procedures
• Clear ACH policy documentation standards
• Escalation procedures for suspicious activity

For small banks and credit unions, this matters.

You are not expected to build massive monitoring programs. You are expected to build thoughtful, documented programs.

Phase 1 NACHA compliance and the March 2026 deadline

Now let’s talk about the timeline.

Phase 1 NACHA compliance focuses on building a commercially reasonable monitoring framework before the March 2026 ACH deadline.

So what should institutions be doing right now?

Here are the priorities I recommend teams start with:

• Review recent ACH credit fraud trends
• Complete transaction baseline development
• Evaluate exposure tied to false pretenses fraud definition
• Update ACH policy documentation standards
• Ensure leadership understands the regulatory timeline

Waiting too long to start this work compresses the window for vendor evaluation, policy development, and governance review.

And fraud fighters know how that story usually ends.

Rushed decisions rarely produce strong programs.

ACH fraud risk assessments must be documented

One of the most important steps in NACHA compliance is completing a defensible ACH fraud risk assessment.

And this is where institutions need to be very intentional.

A strong risk assessment typically includes:

• Originator risk profiling
• Third-party sender oversight review
• Transaction volume and velocity analysis
• ACH return rate monitoring
• Historical ACH credit fraud trends

But the key here is documentation.

Examiners are not just looking at what monitoring tools you have. They are looking at whether your monitoring controls make sense based on your institution’s risk profile.

That alignment is what makes a fraud monitoring program defensible.

False pretenses fraud requires clear definition

Another change institutions need to understand is the emphasis on false pretenses fraud.

This category focuses on scams where a victim authorizes a payment after being manipulated through deception.

Institutions should review how they classify fraud events and ensure internal terminology aligns with NACHA guidance.

This includes:

• Distinguishing authorized push payment fraud from operational errors
• Updating fraud response procedures
• Adjusting monitoring thresholds for social engineering activity
• Ensuring incident reporting aligns with NACHA definitions

When fraud categories are misclassified, it can create confusion in both reporting and governance oversight.

Vendor due diligence is a compliance requirement

Let’s talk about vendor conversations for a minute.

Right now, a lot of ACH monitoring vendors are marketing their tools as turnkey compliance solutions.

That’s where institutions need to slow down.

Claims like:

• “Fully NACHA compliant out of the box”
• “Automated commercially reasonable detection”
• “No configuration required”

should always trigger deeper questions.

Vendor due diligence questions should focus on:

• Customization for ACH transaction anomaly detection
• Data retention and reporting standards
• Support for ACH policy documentation standards
• Integration with existing fraud response procedures
• Audit readiness and documentation

Technology can support your program.

But compliance responsibility always remains with the institution.

Small FI compliance strategy should be proportional

One thing I appreciate about the NACHA framework is the flexibility it provides.

Monitoring expectations should align with:

• Institutional size
• ACH transaction exposure
• Originator concentration
• Transaction complexity

A strong small bank compliance strategy or credit union fraud monitoring program focuses on proportional controls.

Overbuilding systems increases cost without improving governance.

Underbuilding increases regulatory risk.

The goal is balanced, documented monitoring aligned with your institution’s real exposure.

Governance and annual review expectations

Finally, NACHA expects institutions to maintain a strong ACH governance framework.

That typically includes:

• An annual fraud program review
• Board or senior management reporting
• Ongoing transaction baseline updates
• Escalation tracking and documentation
• Monitoring changes in ACH return rates and fraud patterns

Compliance is not a one-time project.

It is an ongoing monitoring lifecycle.

The strategic takeaway

Here’s the big takeaway from this episode.

The NACHA fraud monitoring rules are not about buying new software.

They are about demonstrating that your institution understands its ACH fraud exposure and has implemented commercially reasonable, risk-based monitoring aligned with that exposure.

Institutions that start preparing early will:

• Reduce exam friction
• Avoid rushed vendor decisions
• Strengthen ACH fraud detection
• Build sustainable monitoring programs

And that is exactly what fraud fighters should be aiming for.