Banks must file a currency transaction report with the U.S. Treasury Department when individuals deposit more than $10,000 in cash during a single business day. The report is also required when individuals make withdrawals, currency exchanges or money transfers that exceed $10,000 in one day.
If an individual makes multiple cash deposits that add to more than $10,000, the bank must submit a report if the teller suspects that the customer is trying to evade the federal filing. These federal rules apply to individuals who make deposits in their own accounts. Banks have individual policies that restrict cash deposits into accounts owned by someone else.