We received a State of Wisconsin tax levy against one of our customers; however, we are a Minnesota bank and have no branches in any other states. The only law cited on the levy notice is a Wisconsin statute. Are we obligated to hold funds or respond to this?

I am wondering the same thing, does anyone know of a resource to find the answer?

You'll need to look to the Uniform Enforcement of Foreign Judgement Act for an answer. It appears that if an entity files a judgement in its own state, the judgement would follow the customer to another state if that state adopted the above Act (which Minnesota has). I would suggest a conversation with your legal counsel though, just to be on the safe side.