You've just deposited a large sum of cash or received an unusually hefty check, and now you're wondering: Will your bank notify the IRS? Many people assume banks keep their transactions private, but financial institutions often have mandatory reporting requirements that might put your finances under the IRS microscope. Knowing when and why banks report deposits can help you avoid unnecessary headaches — or worse, IRS scrutiny. Here’s a closer look at why banks have to disclose certain transactions to the ...