Many bank accounts always require the account holder to maintain a minimum balance in the account. In such bank accounts if the balance maintained in the account goes below the required minimum balance amount, then a fee is charged to the account holder. This fee is deducted from the available balance in the account at the time it is levied or the next time the funds are available in the account. To avoid these fees, it is always advisable to ensure the minimum balance level is always maintained in the account.