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How to calculate how far a shorted stock's price can rise before broker issues a margin call?
When margin is calculated as the equity percentage of an account, the point at which a broker will forcibly liquidate is typically called "maintenance margin". In the US, this is 25% for equities. To calculate the price at which this will occur, the initial and maintenance margin must be known.  The formula for a long with margin is: and for a short where P_m is the maintenance margin price, P_i is the initial margin price, m_i is the initial margin rate, and m_m is the maintenance margin rate.  At an initial margin of 50% and a maintenance margin of 25%, a long equity may fall by 1/3 before forced liquidation, a short one may rise by 50%. This calculation can become very complex with different asset classes with differing maintenance margins because the margin debt is applied to all securities collectively.