ACH Return Codes and File Analyzer

Decode Return addenda and export a readable exception report.

Source ACH/NACHA file

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ACH Notification of Change Analyzer
Review corrected banking details reported through an NOC.
NACHA to Excel Converter
Export exceptions for investigation and reconciliation.
NACHA File Viewer
Inspect original entries, return addenda and trace references.

Return information extracted from addenda

The report identifies the Return reason code, original trace, date of death when present, addenda details, and related receiver and payment context available in the file.

How to interpret an R code

An R code explains the network reason for the Return, but the required response depends on the code, entry type, timing, authorization evidence, and ODFI procedure. Read the code definition before retrying or changing data.

Investigation steps by exception

Match the original trace to the originated payment.
Confirm the Return code and settlement impact.
Review account data and authorization evidence.
Track whether correction, contact, or no reinitiation is appropriate.

Returns are not Notifications of Change

A Return sends an entry back and affects settlement. An NOC communicates corrected information for future entries and requires a different operational response.

Questions about ACH Returns and R codes

What does an ACH Return code mean?

It identifies why an RDFI returned an entry, such as account, authorization, timing, or administrative conditions.

Can every returned payment be sent again?

No. Reinitiation depends on the Return reason and applicable rules and authorization.

Why is the original trace important?

It links the exception back to the originated entry and its operational record.

Which authoritative sources support this page?

Technical explanations are checked against these primary sources. Bank-specific requirements can be narrower than general format guidance.

Nacha ACH File Details — Official record-field guidance, including Batch Header SEC codes and addenda capabilities.
Nacha ACH File Overview — Official explanation of files, batches, entries, controls, and batch grouping.
Nacha: How ACH Works — Official overview of ACH participants, consumer and corporate payments, and authorization responsibilities.
Nacha Operating Rules Topics — Current rule changes and implementation topics published by Nacha.

Sources reviewed August 20, 2026. Nacha owns and maintains the linked materials.