How it works

When a customer conducts cash-in or cash-out transactions totaling more than $10,000 in one business day, the institution identifies the person conducting the transaction and anyone on whose behalf it is conducted, then files a CTR with FinCEN. Multiple cash transactions by or for the same person on the same day are aggregated. Deliberately splitting cash to stay under the threshold is "structuring," which is itself a federal offense and a common SAR trigger.

Requirements by jurisdiction

• US: The $10,000 threshold is set in 31 CFR 1010.311 and applies to banks, money services businesses, casinos and other covered institutions. CTRs are generally filed electronically within 15 calendar days. Banks can exempt certain eligible customers under the exemption rules. FinCEN can lower the threshold locally through geographic targeting orders: the southwest border order reissued in September 2026 requires covered MSBs in listed Texas and New Mexico ZIP codes to report cash transactions of $1,000 to $10,000 through 1 March 2027. Bills to raise the CTR threshold to $30,000 have been introduced in Congress but, as of October 2026, have not been enacted.

• EU and UK: There is no direct equivalent of the CTR. Instead, cash is controlled through customer due diligence triggers and limits. The EU AMLR caps cash payments to traders at €10,000 from July 2027 and requires identification for occasional cash transactions of at least €3,000.

Common challenges

Aggregating cash across branches, ATMs and agents in real time is difficult, and inaccurate customer identification data causes filing errors. Teams also need to distinguish routine high-cash businesses from structuring patterns just below the threshold, which the FFIEC manual flags as a frequent gap in monitoring rules.

How teams handle it in practice

Institutions typically automate daily cash aggregation, auto-populate CTR fields from customer records, and route structuring indicators to the SAR process rather than treating them as CTR events. Exemption lists are reviewed periodically. Compliance platforms like Corsa can flag near-threshold cash patterns for analyst review alongside other monitoring alerts.