I can put an end to all this. I do it at IB and it works. But, don't take my word for it, lets dive in.
You can do it too, but IB will not admit to it. I agree they pretend this doesn't exist.
I tested this out last week by:
1) Putting some cash (50k) in an empty Portfolio Margin account
2) Buying 50K (face value) of the Aug 24 2023 T-bills (~49k value, but lets just call it 50k)
3) Selling 4 (very OTM) ES puts to create ~44k of maintenance margin
Here's the result:
1) Immediately after trades, In account window in TWS, you will see 44k debit cash on securities side and 44k credit cash on commodities side.
2) After the bills settle t+1, daily statement will show Securities SETTLED cash balance of -44k and commodities balance of +44k.
3) Interest charges accrue on a 1 day lag. So, you need to wait for the T+2 statement to find out the settled cash balance (and interest charges) for the T+1 day. What you want to look at is the "debit interest details" section of the activity statement. You will need to create a custom statement to enable this section (it is not a default section on the standard activity report). This will show the settled Adjusted cash balance and interest charged (again, on a 1 day lag). In our case, the statement will not generate this section because it is blank.
In summary, no credit interest is accrued on the commodities positive balance, and no debit interest is accrued on the securities side. You don't need to ASK IB to do anything to "enable" this. Don't bother talking to them!!
Normally, a securities debit balance should result in accrued interest. It does not in this special case. Whatever the exact math they use to adjust the securities debit balance to reflect the T-bill is not visible to the account holder. I'm not sure if they use the full face value, market value, and/or if any haircut applied. If you try this out, keep in mind that the each daily statement shows accrued interest for the PREVIOUS days cash balance.
BTW, I've had a dozen calls with IB support over the past week and at this point I believe there is an intentional stonewall going on. IB makes tons of money from 1) not paying interest on futures cash collateral 2) investing that collateral in short term fixed income to earn income for themselves. There's also no documentation on the website about this - there used to be and they have since scrubbed it off.
I've also tried this out in a Cash account and an IRA account, but it does NOT work! I think the mechanics is that the securities side of your account is "lending" cash to the futures side at 0% interest. Thus tbills stay on the securities side, while also fulfilling the futures margin requirements. Feeding 2 birds with one stone!
btw, IB does not allow buying bills at auction, but its easy and cheap to buy them in the secondary in TWS. Use the bond explorer tool to find all the tbills and put in an order around the mid price.
I contacted some other brokers last week to see who does this and here's what I was told:
Here's who does:
- RJO Futures - Called main line. was told "yes", was transferred to a broker who filled me in on details: 95% Haircut, $95 commission on bills, bills must be bought at auction based on the treasury schedule.
Here's who says they do not (or maybe I was stonewalled or got an untrained rep?):
- Tradestation - called institutional support "brad" said they don't do it.
- Amp : web chat: "we do not". Also called, "Dave" said they do not accept t-bills
- Think or swim : trade desk says no
- Optimus: called: jake said no
- Ninja trader: called, said no