On the TOS platform I can price the RUT Sep call BWB 700/710/730 at $1.50 cr. (RUT 665.22, IV 32), and the required TOS margin is $850+$1,000=$1,850 (presumablyâper FINRA). I wanted to compare this to the margin required by IB â but their customer service was not too helpful. Could anybody here who is an IB client, check on this directly on their platform (assuming SPAN and not PM, of course) and let me (us) know. TIA--BBen.