From Department of Financial Institutions-State of Tennessee:
One area to pay close attention to will be the consistency in the disclosure of balances in monthly statements, ATM displays, transaction receipts, telephone and internet banking services and any other medium for providing account information. The balances provided should be well defined, and the definitions disclosed to customers in a clear, understandable format upon opening an account or upon any changes in balance definitions. This includes disclosing the fact that a balance reflects the net amount of funds remaining in an account following processed deposits and withdrawals as well as any overdraft limit incorporated in an overdraft program. Failure to provide this information in an understandable format with the apparent motive of increasing overdrafts and fees may be viewed as a misleading business practice.
If an overdraft program dictates that the payment of insufficient fund transactions is at the bank's discretion, the decision making process concerning whether or not to pay should be objective and consistent. However, if any overdraft program includes a written obligation on the bank's part to pay checks written on an account with insufficient funds, such payments might be considered open end credit, and consequently may be subject to applicable statues that dictate lawful interest rates, finance charges, and disclosure infromation.