If your order is not completely executed in a single transaction (if insufficient shares are available at your limit price or there isn't a buyer for all of the shares you wish to sell), part of your order will remain on the market until it executes or expires.
You will only be charged the applicable corresponding brokerage charge for each transaction based on the value of what has executed (only if subsequent transactions take the total value of your order over the price threshold and into the next brokerage tier would you be required to pay additional brokerage costs). The brokerage payable at different price thresholds is explained further in the CommSec Financial Services Guide which you can view by navigating to Help > Forms & Brochures or clicking here.
If part of your order is cancelled, or we have not been able to complete the order by the order's expiry date, the completed parcel will stand and the balance of your order will be cancelled. It is important to note the completion of your order cannot be guaranteed.
For further clarification about partially executed trades, you can contact us.