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 Credit

    An ACH credit occurs when the receiver’s account is credited.

    Learn More

  • TLS (Transport Layer Security)

    TLS refers to a cryptographic protocol to secure information sent over a computer data network. Connections using TLS typically have multiple authentication methods in place to secure...

    Learn More