Does anyone know how the IB margin calc works? I asked support but they wouldn't tell or didn't know.
It seems wrong... if my loss on a 2% rally is less than a 2% sell off the margin is reduced by buying additional calls. I would have thought it would be the opposite. i.e. buy puts/calls to reduce the side with the greatest 2% loss
Did you check this link?
Margin varies on broker, type of account (Reg-T vs PM), initial/maintenance margins, type of security trading (SPX margins are different from RUT, broad based indices have different margin than equities), types of strategy being used (sometimes BWB might have more margin than a traditional fly)....