Fees can cause you to lose money for many different avoidable reasons. You can be charged for making online transactions, making telephone banking transactions, and using ATMs that don't belong to your bank's system. You can also be charged for taking too much money out of your savings, going under your minimum balance limit in your savings, bouncing a check, and having your balance go below zero which is an overdraft fee. Be careful to avoid these, so you do not lose your hard earned money.