Auxiliary On-Us Field

A field on the magnetic ink character recognition (MICR) line of a check or share draft. This is an optional field that can be found to the left of the routing number. The presence of this field makes the check in-eligible to be used as a source document for accounts receivable conversion (ARC), back office conversion (BOC), and point-of-purchase (POP) entries.

Related Terms

  • ACH

    Automated Clearing House - ACH is a reliable electronic funds transfer (EFT) system governed by National Automated Clearing House Association (NACHA).

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  • ODFI (Originating Depository Financial Institution)

    Financial institutions that originate ACH transactions on behalf of its customers. ODFI's must abide by the National Automated Clearing House Association (NACHA) Operating Rules.

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