A margin call on gold is the warning a broker issues when the ratio of account equity to the margin used by open positions falls to a defined percentage, typically one hundred percent. Below the stop-out level, often fifty percent, the trading platform begins closing XAUUSD positions automatically, starting with the largest floating loss.
Gold reaches these thresholds faster than most instruments because a half-lot position loses about fifty dollars for every dollar the metal moves against it, and twenty-dollar adverse moves occur inside single London or New York sessions. The defence is position sizing from a percentage of equity, a hard stop on every ticket, and reduced open exposure across CPI, non-farm payrolls and FOMC releases.