As rmorse point out, it's the option exchanges that charge the cancel fee. IB passes it along if you incur it.Quote from njrookie:
Why it seems IB is the only firm charging it? I want to place limit order, but also want to be able to cancel the order when underlying moves against me. Any other low cost option broker to recommend? I probably will do over 100 contracts a day.
Quote from Occam:
Neither Nasdaq Options nor Arca Options charge a cancel fee. This is possibly true of others now, as well (Nasdaq PHLX?).
That said, I'm sure IB doesn't like "the little people" competing with their own Timber Hill market making unit, and cancels being an essential part of liquidity adding (expecially for options), it's all rather convenient that they charge their customers cancel fees regardless of whether there really is a fee.