Structuring Definition: Cash Split to Dodge a CTR

The BSA regulations name structuring as an offence of its own. What the rules say it is, how the $10,000 line fits, and what a bank must report.

Published	14 October 2026

What structuring means in banking

The Bank Secrecy Act regulations define the word. § 1010.100 says structuring includes breaking down a single sum of currency exceeding $10,000 into smaller sums.

The rule is built on the $10,000 line.

The definition reaches further than one branch on one day. § 1010.100 says transactions need not exceed the $10,000 reporting threshold at one financial institution on one day to count as structuring. Deals at more than one firm can still count. Transactions on more than one day can too.

Is structuring illegal?

Yes. The rule that bans it sits in the same chapter. § 1010.314 says no person may structure or assist in structuring a transaction with one or more domestic financial institutions.

The same section bans two related acts. § 1010.314 says no person may cause a domestic financial institution to fail to file a required currency transaction report to evade reporting rules. A second clause bars causing a domestic financial institution to file a currency report with a material omission or misstatement of fact. That means a report that leaves facts out or gets them wrong.

The stakes are set out in the FFIEC manual. It says that evading BSA reporting and recordkeeping requirements can bring penalties. The penalties can be civil or criminal under the BSA.

How the CTR threshold defines the offence

The offence only makes sense against the report it targets. FinCEN's advisory says a currency transaction report covers a transaction in currency of more than $10,000 in aggregate per business day. FinCEN's alert says it more plainly. A CTR covers a currency transaction of more than $10,000. Multiple transactions may be aggregated to meet the threshold.

So the line is not one deposit of one amount. Many deals on one business day may count as one.

Two rules on adding up transactions matter here. § 1010.313 says a financial institution includes all of its domestic branch offices for currency transaction reporting. Cash split between two branches of the same bank is still one institution's business. § 1010.313 also covers deposits made at night. It covers deposits made over a weekend or holiday too. These are treated as if received on the next business day.

The report itself, the CTR currency transaction report, is the form all of this feeds. Structuring is the act of working around it.

Smurfing versus structuring

Smurfing is an informal word some people use for structuring. § 1010.314 defines structuring by pointing to the definition of the term in section 1010.100.

In compliance terms the distinction is small. Structuring is the act the rule names and bans. The definition in § 1010.100 is the one the rule applies.

What a bank must do when it suspects structuring

The FFIEC manual is direct on this. It says a bank must file a SAR. The bank files it when it suspects a person is structuring transactions to evade CTR filing.

The SAR rule for MSBs names it too. § 1022.320 says a transaction designed through structuring or other means to evade Bank Secrecy Act requirements must be reported.

So when a bank suspects structuring to evade CTR filing, the FFIEC manual's answer is a SAR. The suspicious activity report banks page covers how the filing works.

Where structuring fits the wider AML framework

The bank secrecy act regulations hold both the definition and the ban. A BSA anti money laundering program sits alongside these reporting rules.

The reporting duty is what follows from the definition and the ban. The regulations define the act and forbid it. They also require the institution to report it when it shows up.