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What is the Auxiliary On-Us field on checks and how does it work?

April 26, 2017Auxiliary checks field

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What is the Auxiliary On-Us field on checks and how does it work?

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The Auxiliary On-Us field is an optional field that can appear on some checks, in the leftmost position of the MICR line. It is generally used on checks issued by corporate treasury, purchasing and accounts payable departments.