Nacha’s 2026 fraud rule changes are coming quickly. Are you ready?

Learn what’s changing for RDFIs, ODFIs, TSPs, and TPSPs—and how Unit21 empowers you to detect, monitor, and act on ACH fraud with confidence.

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2026 NACHA Rule Changes Summary

What’s new in March 2026

The March 2026 NACHA rule changes redraw the lines of ACH fraud responsibility. ODFIs must now actively screen outbound transactions before they hit the network. RDFIs are on the hook for identifying mule accounts on the receiving end. And TPSs and TPSPs face tighter oversight at every step. The shift from passive participation to active monitoring is here, and the clock is already running.

What RDFIs need to Know

RDFIs must monitor inbound ACH 
RDFIs are now responsible for monitoring incoming ACH entries for suspicious activity. NACHA expects RDFIs to flag anomalies, such as account name mismatches, high-volume transactions, and unexpected benefits or payroll payments, and take action without waiting for the ODFI.

What ODFIs need to know

ODFIs must implement fraud rules for web debits 
ODFIs must develop and apply risk-based fraud detection rules to outbound WEB debits. This includes assessing customer risk, monitoring anomalies, and detecting common schemes such as payroll redirection and business email compromise (BEC).

What TPSs need to know

TPSs must monitor the transactions they originate on behalf of others 
If you're a Third-Party Sender processing more than 6 million ACH transactions annually, you must implement fraud monitoring programs by March 20, 2026. As an originator acting on behalf of clients, you're responsible for screening outbound transactions and detecting fraud before they enter the ACH network.

What TPSPs need to know

TPSPs must implement fraud monitoring programs for clients at scale 
Third-Party Service Providers processing more than 6 million ACH transactions annually must implement fraud monitoring programs by March 20, 2026. This includes monitoring ACH activity on behalf of your financial institution clients and detecting anomalies across the transactions you service.

Our Solution

Unit21 helps RDFIs monitor incoming ACH entries for suspicious activity using fuzzy name matching, entity-level behavioral rules, and velocity checks, so your team can flag anomalies and act before funds leave the account.

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Our Solution

Unit21 lets ODFIs build and deploy risk-based fraud rules for outbound WEB debits without writing code. Flag payroll redirection attempts, BEC patterns, and anomalous origination behavior, with audit-ready documentation for examiner review.

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Our Solution

Unit21 gives TPSs the detection infrastructure to monitor ACH transactions originated on behalf of clients. Build originator-level rules, flag anomalous patterns across your client portfolio, and manage alerts through a centralized platform, without writing code.

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Our Solution

Unit21's platform supports client-level rule customization, behavioral tracking across entities, and centralized case management, giving TPSPs the monitoring infrastructure to meet NACHA's fraud program requirements at scale.

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Educational Resources

Get informed & stay compliant

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Navigating Nacha’s 2026 Operating Rules With Unit21

Join Unit21 in this essential educational session exploring the 2026 NACHA Operating Rules and their implications for fraud monitoring across ACH payments.

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Guide

Getting Ahead of Nacha’s 2026 Changes: A Practical Guide

A comprehensive fraud compliance guide for ODFIs, RDFIs, TPSPs, and TPSs navigating Nacha’s 2026 rule overhaul.

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This year, the Nacha operating rules are getting an important update. The 2026 Nacha rule changes are designed to reduce fraud and false-pretense payments across the ACH network.

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ODFIs, TPSs & TPSPs: New Frontline Responsibilities

Learn how to build a proactive, scalable fraud monitoring program using segmentation, risk scoring, and no-code detection rules.

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Frequently Asked Questions

Nacha’s 2026 rule changes

How is this different from adding AI on top of an existing rules engine?
What happens when AI fuzzy matching returns uncertain results?
How does agentic rule optimization handle regulatory requirements?
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