Anti-money laundering (AML).

In plain English

Anti-money laundering programs require a bank to know who its customers are, monitor transactions for patterns that look like layering or structuring, and file reports with the Treasury Department when something looks suspicious. Layering means moving funds through many accounts to obscure the origin, and structuring means breaking a large amount into smaller pieces to stay under reporting thresholds. A compliant program needs written policies, a designated compliance officer, staff training, and independent testing. Rules also require reports on large cash transactions and on transfers above set amounts, with the current thresholds coming from the issuing agency. Penalties for weak programs have run into the billions of dollars.

01Why it matters

These rules are why a bank may ask about the source of a large deposit or freeze a transfer, and knowing the reason turns a frustrating call into a solvable one.

02The math, step by step

Say someone deposits $9,500 in cash at three branches on the same day, totaling $28,500. Each deposit sits below a $10,000 reporting threshold, but the pattern is exactly what monitoring software is built to catch, and the bank reviews it as possible structuring.

Illustrative example. The amounts here are hypothetical, chosen to show how the math works, not real quoted rates or figures.

03What this is NOT

04Receipts

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