IRS Form 4789 Currency Transaction Report (CTR): A CTR must be filed for each deposit, withdrawal, exchange of currency, or other payment or transfer, by, through or to a financial institution, which involves a transaction in currency of more than $10,000. Multiple currency transactions must be treated as a single transaction if the financial institution has knowledge that: (a) they are conducted by or on behalf of the same person; and, (b) they result in cash received or disbursed by the financial institution of more than $10,000. (31 CFR 103.22)