I have no experience with tiered commissions, so I don't know. I would suggest that you ask IB about the "delay time" between you incurring those costs and them reporting it. I did notice that for reporting interests paid/charged there is quite a long delay. For example: the overview received at the end of June had the interest for May calculated. So more than one month delay.But if its not listed on the June statement, then what else can I do.
