A margin call is a warning that your account equity has dropped too low to support your open positions. If losses keep mounting, the broker starts closing trades automatically at the stop-out level. It is the last line of defense before an account goes to zero.
Key takeaways
- A margin call warns that your equity has dropped too low to support open trades; keep falling and the broker force-closes at the stop-out level.
- Margin level = equity ÷ used margin. Brokers act when it falls below their threshold (often ~100%), with stop-out around 50%.
- The real cause is almost always oversized positions - fixed small risk, a stop loss on every trade, and low used margin make a margin call essentially impossible. Check the numbers with the margin calculator.
The terms you need
- Equity - your balance plus or minus any floating profit and loss on open trades.
- Used margin - the deposit locked up to hold your open positions.
- Margin level - equity divided by used margin, as a percentage. This is the number brokers watch.
When floating losses drag equity down, the margin level falls. Cross the broker's threshold - often 100% - and you get the margin call. Keep falling to the stop-out level and positions are force-closed.
Why margin calls really happen
The market gets blamed, but the true cause is nearly always position size. If you commit a huge slice of your account as margin and skip a stop loss, a normal adverse move is enough to collapse your margin level. This is the same trap covered in how leverage works - the leverage is not the problem, the oversized position is.
How to never see one
- Risk a fixed small amount per trade. The one percent rule keeps any single loss tiny relative to equity.
- Always use a stop loss. A stop closes the trade at a planned loss long before margin is threatened.
- Keep used margin low. The smaller your positions, the larger the buffer before margin level even approaches the danger zone.
Important: a margin call is a symptom, not a cause. If you ever receive one, the lesson is not "the market moved," it is "my position was too big." Fix the sizing and the symptom disappears for good.
Watch margin behave without the danger
Because a backtesting simulator lets you set balance and leverage and place real-sized trades, you can see how margin is consumed as positions grow and how a proper stop closes a loss long before equity is threatened. Learning that relationship on historical data means you never have to learn it the expensive way on a live account.
Margin call FAQ
What is a margin call in forex?
A warning that account equity has fallen too low to support open positions. If equity keeps dropping, the broker closes trades automatically at the stop-out level.
What triggers a margin call?
Oversized positions plus losing trades. Too much margin committed and prices moving against you push the margin level below the broker's limit. The root cause is risking too much per trade.
How do you avoid a margin call?
Size every trade from a fixed small risk, always use a stop, and keep used margin low. Traders who size properly essentially never see one.
What is the difference between a margin call and a stop-out?
A margin call is the warning (margin level below ~100%) asking you to add funds or cut positions. A stop-out is the action - around ~50% the broker auto-closes positions, largest loser first, to keep the account from going negative.