Carlton,
Fees are on a per trade basis. For example, if you buy one ES contract the bundled fee is $2.40. When you sell there will be another $2.40. It doesn't matter if it is 2 seconds later or two weeks later. Unbundled fees work a bit different but that is only for high volume traders.
In the case of partial fills on stocks IB figures out the total number of shares traded and counts it as one transaction for commission calculation purposes. Of course that is in a single session. Doesn't carry over to the next day. If you modify the order before it is filled you will be charged based on what has been filled. The modified order will be counted as a new order.
Fees are on a per trade basis. For example, if you buy one ES contract the bundled fee is $2.40. When you sell there will be another $2.40. It doesn't matter if it is 2 seconds later or two weeks later. Unbundled fees work a bit different but that is only for high volume traders.
In the case of partial fills on stocks IB figures out the total number of shares traded and counts it as one transaction for commission calculation purposes. Of course that is in a single session. Doesn't carry over to the next day. If you modify the order before it is filled you will be charged based on what has been filled. The modified order will be counted as a new order.
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