Suspicious Activity Reports are one of the most misunderstood compliance obligations in the BSA framework. Most businesses either over-file on irrelevant activity or under-file on genuine red flags. Here's the practical framework for getting it right.
SAR filing is required when you know, suspect, or have reason to suspect illegal activity - judgment is required
A Suspicious Activity Report is required when a financial institution knows, suspects, or has reason to suspect that a transaction involves funds from illegal activity, is designed to evade BSA reporting requirements, lacks a lawful purpose, or involves the use of the financial institution to facilitate criminal activity. That definition sounds broad - and it is - but the practical application requires judgment, documentation, and a clear internal process.
Structuring is the most common SAR trigger - transactions consistently just below $10,000 are a red flag
The $5,000 threshold for SAR filing applies to transactions involving a known or suspected violation of federal law. For MSBs, the threshold is $2,000. These thresholds are floors, not ceilings - you can and should file SARs on transactions below these amounts when the circumstances warrant. The threshold determines when filing is mandatory; it doesn't determine when filing is appropriate.
SAR narratives must be specific and factual - vague narratives are useless to law enforcement
The most common SAR trigger in practice is structuring - the deliberate breaking up of transactions to avoid the $10,000 CTR threshold. Structuring is a federal crime regardless of whether the underlying funds are legitimate. If a customer consistently makes deposits or transactions just below $10,000, or if a customer explicitly asks about reporting thresholds, those are structuring red flags that require a SAR regardless of whether you can identify the underlying criminal activity.
The 30-day filing deadline runs from identification date, not transaction date
The SAR narrative is where most businesses fail. A SAR narrative must tell a specific, factual story: who did what, when, how much, and why it was suspicious. Vague narratives - "customer conducted unusual transactions" - are nearly useless to law enforcement and signal to regulators that your SAR program is a checkbox exercise rather than a genuine compliance function. Write the narrative as if explaining the situation to a detective who has no prior knowledge of the customer or the transaction.
A SAR tracking log is essential for demonstrating timely filing compliance
The 30-day filing deadline runs from the date you identify the suspicious activity, not from the date the transaction occurred. If you identify suspicious activity on November 1, your SAR must be filed by December 1. Missing the deadline is a separate compliance failure from the underlying suspicious activity. Build a SAR tracking log that records the identification date, the filing deadline, and the actual filing date for every SAR your program generates.
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Compliance Program Specialist · Soflo Consulting
Sofia Delgado is a Compliance Program Specialist at Soflo Consulting with expertise in mortgage lender AML requirements, Florida-specific regulatory obligations, and small business compliance program design. She works with non-bank mortgage lenders, title companies, and real estate professionals to build practical, examiner-ready compliance programs.
5 sections
Key Takeaways
- 1SAR filing is required when you know, suspect, or have reason to suspect illegal activity - judgment is required
- 2Structuring is the most common SAR trigger - transactions consistently just below $10,000 are a red flag
- 3SAR narratives must be specific and factual - vague narratives are useless to law enforcement
- 4The 30-day filing deadline runs from identification date, not transaction date
- 5A SAR tracking log is essential for demonstrating timely filing compliance
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