Direct answer
A margin call in forex happens when your account equity falls to (or below) the margin level required by your broker for the open positions you hold. In plain terms: losses reduce the money in your account, and once the remaining equity is no longer sufficient relative to the margin you are using, the broker warns you (or takes action) according to its margin rules.
How it works (mechanics)
Forex accounts typically separate used margin (the portion of your balance tied up to keep positions open) from equity (a balance plus or minus the unrealized profit or loss on open positions). As market prices move against your position, unrealized losses increase, which lowers equity.
Most margin systems compare a ratio—commonly called margin level—between equity and used margin. Although wording varies by broker, the trigger generally occurs when this ratio drops to a broker-set threshold. At that point, the broker issues a margin call, asking for something that restores the account’s ability to meet margin requirements.
Common drivers that push the trigger closer:
- Price movements that create unrealized losses on one or more open trades.
- Higher effective leverage from large position size relative to account funds.
- A smaller equity cushion (for example, after prior losses or partial withdrawals, where permitted).
Checks and typical conditions
Because broker rules differ, the most verifiable way to understand “when” is to identify what your broker uses for:
- The margin level formula (some may use equity/used margin, others may show related calculations).
- The margin call threshold (the specific ratio level that triggers the call).
- Whether the broker uses additional conditions beyond the ratio (for example, treatment of certain instruments, fees, or how it updates equity).
A practical independent check is to monitor your account’s displayed equity and margin level after price changes. If unrealized losses rise and margin level moves toward the broker’s margin call level, a margin call becomes more likely under those rules.
It is also common for brokers to have a separate, lower stop-out or liquidation step if the account continues to fall after the margin call. The existence of multiple stages does not change the core idea: the trigger is tied to equity versus required margin, using the broker’s thresholds.
Limitations and uncertainty
Exact margin call timing is not universal because it depends on broker-specific margin policies and calculations, which can differ in formulas, update frequency, and threshold values. Also, there is no single real-time number that applies to all accounts; the trigger depends on your current equity and used margin at the moments the broker recalculates margin.
Finally, this explanation describes the mechanism and the material assumptions (equity drops due to unrealized losses, and a broker ratio/threshold triggers an alert). It does not predict outcomes for a particular account, because we do not have access to your broker’s specific rules or your current account figures.