Two things - for individual stocks - use the what if function. (right click on an order)
For a portfolio, you can use risk navigator to create a whatif portfolio.
All of this info is available and can be found using the search function from our website or reviewing the user guide:
https://guides.interactivebrokers.c...eate_a_what-if_portfolio.htm?Highlight=margin
that What-If did not cut it unfortunately. Variance does not match what I see on TWS. Raised it with the help desk and they could not provide a clear answer why this was the case.
I was hopping for a simple overnight initial margin security by security report of some kind.