K200 Kospi positions overnight on IB

Is this how trading the Kospi works?...
And is the danger highlighted at the end of the post a reality?

1. Buy to Open K200 using Interactive Brokers,

2. IB will lend you the KRW, which is on based the accounts ability to margin KRW. (note: maximum leverage on KRW/USD is 10%)

The account will now have:

(a) short KRW/USD FX position.
(b) Long K200@KSE SPAN margined position.

3. Interest will be charged on the FX as followed:

4.04% on 1 - 120,000,000
3.54% on 120,000,001 - 1,200,000,000
3.04% on the amount above 1,200,000,001

4. Sell to Close K200. If trade returned profit then now have long KRW/USD FX postion. FX postion earns interest as follows:

1% on 1 - 120,000,000
1.25% on 120,000,001 +

Is this all correct?

I'm concerned that IB's market close price of KRW/USD is c-1.00000000.

I don't have millions of Dollars in my account to margin millions of Won at a 1:1 ration!

...For me it would mean facing a margin call on any possible overnight FX position.

How is it possible to carry KSE trades like this overnight ?
 
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