Which bank transactions must be reported to the Feds?

Any cash or cash equivalent transaction exceeding $10,000 or any transaction(s) the bank classifies as unusual in nature or not customary by that customer, such as an unusually large number of cash transactions less than $10,000 but in total exceeds $10,000 performed over a short period of time.

Banks are required to do this by law and must report such transactions to the IRS.

Usually armed robberies