Administered by the Financial Crimes Enforcement Network, a bureau of the US Department of the Treasury.
http://www.ffiec.gov/bsa_aml_infobase/documents/forms/Form_104.pdf
A currency transaction report (CTR) is a report that US financial institutions are required to file with the Financial Crimes Enforcement Network for each deposit, withdrawal, exchange of currency, or other payment or transfer, by, through, or to the financial institution which involves a transaction in currency of more than $10,000.
Key Facts
Certain types of currency transactions need not be reported, such as those involving "exempt persons," a group which can include retail or commercial customers meeting specific criteria for exemption. Refer to the core overview section
Additional Information
As of April 1, 2013, financial institutions must use the new FinCEN reports, which are available only electronically via:
the BSA E-Filing System
FinCEN CTR Electronic Filing Requirements
Who it affects
All US financial institutions.
Wikipedia Entry
http://en.wikipedia.org/wiki/Currency_transaction_report