You must think the IRS and Treasury Dept is stupid like you- you and the Bank report interest you get to the IRS sparky for tax purposes. Also any deposit or withdrawal of 10K or more the bank and you fill out a CTR if in cash. If they get interest from your accounts they pretty much have an idea what your cash balances are in that bank over a year. Like facebook the IRS uses algorithms too. The Treasury is looking at large cash deposits and withdrawals for illegal activity. That was put in because the mafia in the North End of Boston use to leave bags of money to deposit in the First National Bank of Boston in the 60's and early 70's. Since then a law was passed to monitor that activity.
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