Minimum Commission - This is the lowest commission rate available, usually for market orders placed online. Some firms charge additional fees on every trade, or have higher commissions for limit orders, for orders placed using a touch tone telephone system, or for orders placed with a live broker. Typically, firms charge an additional commission for orders of 1,000 or 5,000 shares or more; some may charge a surcharge for orders of fewer than 100 shares. Be sure to read the fine print on the commission schedule carefully before opening an account.