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Thanks hajimow. I had to read that 3 times before it sunk in! I thought in the past that margin was simply 20% of the underlying... maybe I knew less than I thought. Anyone know of a decent online or downloadable calculator that would let you enter in the stock price and option price and...

I haven't been in the market in roughly 5 years (remember what happened 5 years ago? yeah, that's why) At the time, I used IB strickly for writing puts and calls. Looking back, I think I understood their margin requirements for naked puts and calls but now, looking at their website, I can't...