Expected fees and interest rates paid for Interactive Brokers margin account

Hello forum.

I am trying to get my head around the following.

I have 10.000 USD in a margin account at Interactive Brokers. And I buy 5.000 USD worth of GOOG and sell 5.000 USD worth of FB. So I have:

10.000 USD cash
5.000 USD of GOOG
-5.000 USD of FB

And I hold this position for one year.

What can expect to pay and receive in interest? That is:

1. Interest received on 10.000 USD in cash?
2. Interest received for allowing shorting of GOOG?
3. Interest paid for shorting of FB?

Any additional fees?

As far as I can see the following applies:

1. Currently 0%.

https://www.interactivebrokers.com/en/index.php?f=interest&p=schedule

0%
10,000.01 + 0% (BM - 0.5%)

Where BM is the overnight fed funds rate. Currently 0.370%

2. None

3. After SLB - Shortable Instruments Tool found under account management:

Symbol @ Exchange: FB @ ARCA
Quantity Available: >10'000'000 shares
Current Rebate Rate*: 0.1200%
Current Fee Rate**: 0.2500%

I think I will paid last of the two rates: 0.2500%

Is this correct?

Suppose I increase the positions from 5.000/-5.000+10.000 to 7.500/-7.500+10.000? Does it makes any difference to the interest paid?
 
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