flip26 11 Report post Posted March 23, 2020 Hello: Is anyone using Portfolio Margin on their account? I have done some research, and know that technically, "Individual stock and option positions are tested with +/- 15% price changes" according to broker web sites. But, as we all know - IV also changes with price changes, and therefore option premiums will change as well. The question then becomes, how are margin requirements for option strategies calculated in a portfolio margin account. Any insight would be appreciated. Thanks! Share this post Link to post Share on other sites
pintodave 86 Report post Posted March 24, 2020 Been a while since I looked at it, but I am pretty sure that ThinkOrSwim looks at the -20% price slice. Share this post Link to post Share on other sites