Quote from PatrickStandford:
I had not seen that. So while not fraudulent, it remains one of the slimiest fine-print practices I have seen. Who else "rounds" up from $1.01 to $2.00 to charge you twice the fee they list? No one that I know of. I happen to like IB overall, but this policy is just robbery.
I will agree that the specified rounding policy is not reasonable for low priced stocks.
Your choices are to not short low priced stocks at IB or to use another broker.