|A federal regulation that takes effect today says that customers must grant banks permission to cover debit card purchases and ATM withdrawals if they don't have enough money in their accounts. |
The new rules prohibit banks from automatically charging overdraft fees. Instead, you can decide whether you want to pay an overdraft fee, in which case you'll have to "opt in" for overdraft service.
If you don't want to risk an overdraft fee, do nothing, and starting Aug. 15, your bank will simply decline transactions at the cash register or gas pump that would take your balance below zero.
Source Palm Beach Post Article 7/1/2010