Anyone knows how to contact their CS? Unable to reset password since it directs me to the helpdesk but they dont do live chat unless youre logged in and the only feasible yet peicey choice is via the Singapore helpline.

A quick Google leads me to this: https://ndcdyn.interactivebrokers.com/sso/PasswordReset

This is what I faced whenever I tried

Ok, use the Skype route then. It's US office hours now in New York, just nice to drop a call.

Instructions available here: https://forum.lowyat.net/index.php?showtopi...#entry101660597

FT Jane Street Capital

New titans of Wall Street: how Jane Street rode the ETF wave to ‘obscene’ riches
A quirky and opaque New York firm has rapidly expanded to become the most profitable trader of all

https://www.ft.com/content/f7cb25ba-7329-42...d3-8a34ef84f9f0

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Can google "complex systems"...

Three-body is physics problem yea, and there are solutions to cases with constraints like the elliptical-restricted 3-body problem (ER3BP) or circularly-restricted 3-body problem (CR3BP). But complex systems are more like many-body problems, and agents interacting in unpredictable, probabilistic ways. You will need chaos theory and some statistical mechanics to understand stuffs.

Classic examples of complex systems are like fractals (mathematical objects in 2D case have infinite lengths but enclosing finite areas, or in 3D, infinite surface area enclosing finite volume), the Earth biological ecosystems, weather and climate systems, financial markets, societal interactions etc. My research is focusing on financial markets haha

Uhmm why do you need to close your T-bill positions earlier than the maturity date? Unless you are worried about government defaults, which do happen occasionally in the US when there is a government shutdown, but that last for days only and the yield will spike to 7-10% p.a., enough to compensate for that short-term anxiety I guess. Otherwise, your selling act will result in extra lost in commissions/fees to your brokers.

You can buy T-bills/T-bills ETFs any time to park your USD cash in the short run, the yields are still around 4.7% p.a. though it is going down. But for short-term parking, it's not a problem, you earn your returns at a risk-free rate anyway, so nothing lost.

Yea, the cheapest way to park your funds in IBKR is just use BIL ETF. Park all your USD save for a couple of dollars for commissions in BIL ETF. Withdraw anytime during US premarket/aftermarket or during normal trading session then you can use it to purchase any US stocks/ETFs instantaneously, even with cash account, no need for T+1 settlement unless you need to withdraw the money out of IBKR account into say, your USD bank accounts.

Try to avoid fractional shares with BIL ETF yea... At worst, you will leave behind some 90ish USD as cash in your IBKR account. Fractional shares for stocks with 4 digits share prices are easier to trade, but for double digit unit price like the case of BIL ETF it's a hassle to buy and sell. After all, your goal is short-term liquidity management here...

As for tax, indeed as Medufsaid said, there is a 30% WHT when BIL credit the dividends to you every month, but around early February of the following year, IBKR will reverse the WHT and refund you the money in your USD cash account.

The expected return of BIL ETF is about 20 basis points below the 1-2 month US T-bill yields, mainly due to the 0.14% management fee charges from SSGA and another 0.05% from the lost in interests on interests due to the 30% withholding tax.

*In case you wonder how to compute the lost in interests on interests... here's the maths:

Assuming you start in February in year 0, you lose 5%/12 * 30% WHT * 5% , the second 5% being the interests on interests. In March, you lose 5%/12 * 30% WHT * 5% * (11/12), now you lose (11/12) of the annual interests on interests (you only got 11/12 of a year left to compound your interests on interests until next year's February, when IBKR refund you the 30% WHT), but the capital remains the same, i.e., 5%/12 month * 30% WHT. So the total opportunity cost, in simple interest terms, to first order effect (we ignore interests on interests on interests and .... on interests...  and... ), the sum of series is 5%/12 * 30% WHT * (1/12) * (12+11+10+...+1) = 0.04% p.a.

Do correct me if my maths is wrong... my head is spinning all over the place writing my PhD qualifying exam report...

Thanks sifu for sharing.
I bought BIL last night. I saw the chart like every month price will drop back .
Is it declare dividen ? we need pay tax ma ?

anyway just park there first

Yea, the "dropping back" is due to dividend declaration, tax is 30% WHT, as quoted in Medufsaid's post. But the tax will be reversed and refunded to you around early February the following year.

Thanks for the info, just saw the post after i reply.

Yea you can scalp BIL, I shared the details earlier here:

thanks, i read your post before.
I check from chart history, BIL seems like no changes, all changes is only like 0.01
thus i not sure are we  having chance to  scalp it ?

Yes, the changes are very small if you compare the market open and closing price. The magic happens intraday... especially during Asian/US Overnight hours...

That is when liquidity is thin and price jumps up and down erratically. These price jumps are NOT recorded into the official price statistics you see on Yahoo Finance etc., because they are executed off-exchange... Yahoo Finance/Google Finance etc. shows only the data stream from NYSE/NASDAQ exchanges covering premarket, normal market and aftermarket sessions.

Thanks for sharing.
The price changes is so small , you sit there and wait for it ?
If i using SMART route, will it filled during overnight as well ?