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How much buying power does IB require if I want to sell $10,000 box?

Is it unlimited? If I have $100 in my IB account, can I sell $1,000,000 box?

1Thomas Kwa
Why would you? The point of the box spread trick is to reduce interest on margin loans, they don't increase your buying power. Selling box spreads without a margin loan just makes you pay small amounts of interest for no reason.