How much CTR filing cost will you save with the exemption? (Cost of producing and filing one CTR times the number of CTRs you filed during the most recent year included in your review.)
How much time and cost does it take to create and document the exemption, train and retrain staff about what is exempt and what is not, conduct internal reviews for compliance with your exemption decisions, defend the exemption during BSA inquisitions by examiners, and monitor the exempt customer?
Unless the difference is substantial, forget the exemption - you're kidding yourself about the risk/reward ratio.
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...gone fishing.