Payment Glossary

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

  • NACHA (National Automated Clearing House Association – The Electronic Payments Association)

    The national trade association responsible for developing and enforcing ACH rules and guidelines.

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