Isn't that what over draft protection is all about? It can be tied to a credit card, savings or a line of credit. I have mine set up to pull from my savings account when necessary. Come on, this is not something only extended to the Bill Gates of the world. B of A gave me overdraft protection from a small line of credit when I first opened my account with them 21 years ago when I was still an underpaid field tech. Don't these people think of stuff like this?