Thank you for the responses.
Sorry but I don't understand you. You say if I have -800 k cash in my account and I sell 800 k in boxes my cash will go to 0. Of course.
But what happen if I have 300 k cash and I sell 800 k in boxes ? My cash will go to 1.1 milion and the margin for the boxes will be 5,000, very low.
That is what I want to know.
I am not talking about Liquidation Net value.
So now I have 1.1 m cash in my account and a margin of 5,000
Unless someone sates the oposite, the cash from short boxes are part of the Equity with loan, or not? maybe here is where I misunderstand.
and Excess liquidity = ELV - Margin.
I have open a ticket in IB to ask if Equity with loan is different in a rules based account than in a risk based account. That is important.
thanks
You can't use the proceeds from the box to trade other positions and it does not increase your equity. It's restricted cash. The only use for this is if you have negative cash before selling the box. You will be allowed to lever up roughly to the same amount of total assets as before, but instead of doing so through IBKR's funding, you're doing it through the implied rate of the boxes. In fact, if you're not short cash, you lose money through selling boxes cause the implied rate that you pay will likely be higher than what you receive on cash from IBKR. The only use for this is to save on funding costs.
Read Natenberg's section on Boxes. He cites them as a way for a market maker to raise short-term funding: http://terredegaia.free.fr/ppics/Trading/Mcgraw-Hill - Option Pricing And Volatility - Advanced Strategies And Trading Techniques - Sheldon Natenberg - (1994).pdf
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