Interesting thread about cash maintenance, something I have been very unfamiliar with. Could someone check if I understood correctly (more or less, and I am assuming here futures options and options on stocks work the same)?
I have a Euro account at IB Ireland. Trading mostly US options on stocks. I also get (according to IB advertisement, haven't checked myself) some interest rate on uninvested instantly available cash. Is it correct I could also just buy approved T-bills (earning the T-bill return), which will reduce my univested cash, but hardly reduced available margin for option trades? And since I have a Euro account, maybe even buy (or have to buy?) Euro denominated German bills with the same result? Or maybe I am way off, also very possible![]()
I'm not sure what exactly your first question is - the last few pages in this thread were about T-bills.
If you read the thread, you will notice that I asked the exact same question about allowable collateral (other than cash) for EUR denominated futures. Let us know if you have an answer; you can just try it out, it will cost you a few Euros. I didn't get around trying it yet.
I noticed that in some of my accounts, the T-bills (or whatever other mechanism) have the effect that the futures (here: ICE futures) on exchanges that don't have FOPs, don't affect the margin debt that interest is charged; while in other accounts the maintenance margin of the ICE futures is deducted from the interest-bearing cash balance. I find it really hard to reverse-engineer the rules, and scary that IB is unable to state and to communicate their own rules.
I have a feeling that ICE futures reduce interest-bearing cash when total USD cash is positive, but don't make debit interest bearing negative cash balances more negative when the total USD cash is already negative. Why that so is, is beyond me - seems inconsistent. Both scenarios are under the assumption that there is enough other futures collateral (CME FOPs) for the maintenance margin of both the CME and the ICE futures in the account, of course.
I discovered a number of other bugs in IB's interest rate calcs; so I wouldn't be surprised if their calcs are unintendedly inconsistent. IB seems to be really struggling with some aspects of their systems. It's by far the best platform available for my needs though, so I guess I shouldn't complain.
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