There is a cancellation fee at IB. However, if you are modifying the order, and ultimately complete the execution, then they apply a credit against the cancellation. Usually this washes out, or at least does for me.
I usually place orders at the midpoint on spreads, and back off once or twice if necessary. In that situation I see a net charge for the cancels about one out of 20 or 30 times.
First post in this forum. Hello to everyone.
Steve G