It is my understanding that you can no longer have separate accts. I asked to go back to my commodity only acct. because of IB's , to put it mildly, rather different bookkeeping methods. Was told no dice. Can you imagine trading ten-years in 64's and then seeing them marked to the market close that happen before you made the trade, and in decimals? Try and remember where you traded something 2 or 3 days before, and have to look through your emails to find the execution price , then convert from decimals to 64's. I might have done that in my head 25 years ago but no more. And your monthly statement? As Tony S. would say, "Forget about it!".