How is Current Maintenance Margin calculated by Interactive Brokers?

External question — Personal Finance Stack Exchange Author: VHanded Original post: https://money.stackexchange.com/questions/130799 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I am curious about how Interactive Brokers calculates Current Maintenance Margin and Current Initial Margin. Why do both have the same value? I have an all-stock account.

External answer — Personal Finance Stack Exchange Author: Bob Baerker Original post: https://money.stackexchange.com/a/130839 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. The reason that I asked about the $25k is that a Pattern Day Trader is allowed 25% margin intraday but must revert to 50% by the EOD for overnight margin. Margin maintenance is also 25%. For some reason, Interactive Brokers displays both Current Maintenance Margin and Current Initial Margin at 25%. AFAIC, they should display the 50% overnight margin amount.