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

  • ATX (Financial EDI Acknowledgement)

    An ATX entry is an acknowledgement by the receiving depository financial institution (RDFI) confirming the receipt of a corporate trade exchange (CTX) credit entry.

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  • BOC (Back Office Conversion)

    A BOC entry is a one time debit entry to the account of a receiver whom has, at the point of purchase, been notified that their check...

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