What if you refuse to provide unless you get a clearer explanation. Yes the bank knows your wages, but they need to know your entire financial info if your not applying for a loan? I have had that to come and haunt me and vowed never to bank where I work. I would have real issue with that. (If I am a millionaire and choose to work for entertainment, it should not be their business. On the other hand if I am financially strapped, they should check my checking activity for possible kiting, high volumes, etc.)