Free margin is the amount of equity left over after subtracting margin already committed to open positions. It's the real-time cushion that absorbs floating losses before a margin call is triggered, and it's what actually limits how many additional positions can be opened — not the account balance shown at the top of the platform.
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TRADING GLOSSARY
Free Margin
The portion of account equity not tied up as margin, available to open new trades or absorb losses.