Quote from Maverick74:
One to one is not a haircut. A haircut is what is offered to market makers, a risk based haircut I should say. A haircut is where you are not putting up the notional value of your position but rather the risk capital. Using the word leverage to describe it is rather tricky. Because it can be anywhere from 10 to 1 to 100 to 1.
Haircuts usually consist of using the max loss your pos would incur today with a 15% up move and 15% down move in a stock. With indexes it's 10% for nasdaq and for the dow and s&p it's 8% to the downside and 6% to the upside. This is all you put up. Everyday your haircut changes as the underlying moves.
The biggest advantage to haircuts is not the initial leverage, for lack of better word, but rather the fact that when you make adjustments to your position, rather then having to put up more capital, you put up less capital. This allows you to trade the underlying at will, trade synthetics, and lay out premium at no cost.
When one is long gamma, since there usually is no risk outside of daily decay, the exchange makes you put up a minimum of $25 per contract on equities and 1$ per contract for indexes.
So an example. If I bought 100k worth of long NDX premium today, at IB, I would have to put up 100k in cash, with a haircut account I might have to put up 1k. That's it. It's a huge difference.
I personally do not believe it's possible to trade options for a living in a retail account. You need haircut margins unless your managing OPM in large amounts. Even then, it's beneficial to have a haircut account. I hope this helps.