Meaning
This clause is the broker telling you which reality wins when things get messy. Translation: if your margin level falls, the broker can close positions (sometimes without notice) to protect themselves.
Why it exists
The broker is the intermediary. If your account can go negative, the broker can be left holding the bag. Margin rules are their automated safety system.
How it hurts
- Stop-outs can occur during spread expansion or fast gaps.
- Positions may be closed in an order that is not optimal for you.
- Dynamic margin changes can shrink free margin instantly.
How to respond
- Keep a free-margin floor you never spend.
- Cap total heat across correlated positions (FX often becomes one macro bet in stress).
- Before events/weekends, reduce size so you cannot be liquidated by a single discontinuity.
Red flag
- History of sudden margin changes without communication.
- Close-out levels are aggressive (little room between warning and liquidation).
- Liquidation policy is opaque (how positions are selected, order type used).
Notes
This clause is why survival sizing matters. Brokers manage their risk first.
If your strategy requires running near margin limits, the strategy is structurally fragile.
Survival rule: when volatility expands, your risk budget must fall. If you keep size constant, your effective leverage rises.