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Thanks. I have two accounts. One is Degiro (margin is enabled), second is European IB (no margin yet). We have a different regulations than US and here is no Reg T. However, currently mostly I'm interested in general situations for backtesting using historical quotes. Likely different brokers...

Unfortunately, this article does not have an answer to my question.

Hi. I'm curious how margin requirement for short positions is calculated. For example, some stock costs $500 and my account has $10k of cash. If margin requirement is 100%, then I can open a short position of 20 stocks (lets assume that there are no other expenses like margin fees, commission...