R26 - Mandatory Field Error
A field that the Nacha format requires to be populated is missing or contains erroneous data. The entry is structurally incomplete.
R26 - Mandatory Field Error
A field that the Nacha format requires to be populated is missing or contains erroneous data. The entry is structurally incomplete. This rejection is recoverable: correct the cause and the same payment can be resubmitted.
What this code means
A field that the Nacha format requires to be populated is missing or contains erroneous data. The entry is structurally incomplete.
Typical causes
- Required field left blank by the originating system
- Field padded incorrectly in the fixed-width 94-character record
- Mandatory field populated with spaces or zeros where a value is required
What to do
Populate the missing mandatory field and re-send. Not a reinitiation.
What it looks like in an ACH return
The return arrives as an Addenda Record (type 99), 94 characters wide. The return reason code sits in positions 4-6.
799R26091000010000001 09100001 091000019000001Tools for this code
Decode a real status report, or check a payment file before you send it — all in your browser, nothing uploaded.
Related codes
Source: Nacha ISO 20022 mapping guide + Federal Reserve ACH Return Reason Report + US Treasury Green Book · Last verified: 2026-07-13
Checked against: nacha.org · frbservices.org