What Is a Margin Call and How to Avoid One

What Is a Margin Call?

A margin call is a warning from your broker that your account’s margin level has fallen to a critical threshold, usually because losses on open positions have eroded your available equity. It’s a signal that you need to either deposit additional funds, close some positions, or reduce your exposure — otherwise the broker’s automated systems will likely start closing positions for you.

Margin calls are a direct consequence of trading with leverage. Because leveraged positions are larger than the capital backing them, losses can consume the account’s margin relatively quickly if a trade moves against you without a stop-loss in place.

Understanding Margin Level

The key figure that determines whether you’re approaching a margin call is your margin level, calculated as:

Margin Level (%) = (Equity ÷ Used Margin) × 100

• Equity is your account balance adjusted for the floating profit or loss of any open positions.
• Used margin is the total amount currently locked up as collateral for your open positions.

Most brokers set a margin call threshold around 100% (meaning equity equals used margin) and a separate, lower stop-out threshold, commonly somewhere between 20% and 50%, though exact levels vary by broker.

Worked Example: How Margin Level Falls

Account balance: $2,000 Position opened: requires $500 in initial margin Free margin: $1,500 remaining

At the moment the trade is opened, with no floating loss yet:

• Equity = $2,000 (balance, no floating P&L yet)
• Used margin = $500
• Margin level = ($2,000 ÷ $500) × 100 = 400%

Now suppose the trade moves against the trader, producing a floating loss of $1,300:

• Equity = $2,000 − $1,300 = $700
• Used margin = $500 (unchanged, assuming position size wasn’t adjusted)
• Margin level = ($700 ÷ $500) × 100 = 140%

If the broker’s margin call threshold is 100%, the trader is getting close. If the floating loss grows to $1,500:

• Equity = $2,000 − $1,500 = $500
• Margin level = ($500 ÷ $500) × 100 = 100% — margin call triggered.

If losses continue and the broker’s stop-out level is, say, 50%:

• Equity would need to fall to $250 (half of the $500 used margin) for the stop-out to trigger, at which point the broker’s system would begin automatically closing positions to prevent the account from going into negative balance.

This example shows how quickly margin level can deteriorate on a single, unmanaged position without a stop-loss — the trader in this scenario lost 75% of their account balance before the automatic stop-out even occurred.

What Happens During a Stop-Out

When an account reaches the stop-out level, the broker’s system typically closes the largest losing position first (or all positions, depending on the broker’s policy), continuing until the margin level rises back above the stop-out threshold or all positions are closed. This process happens automatically and without warning at the moment it triggers — it is not something you can typically stop once the threshold is breached, which is why waiting until this point is far riskier than managing exposure proactively.

Why Margin Calls Usually Happen

Margin calls are rarely a random event — they’re almost always the predictable result of one or more of these:

• Oversized positions relative to account balance. Using most of the available margin leaves little buffer for the position to move against you.
• No stop-loss. Without one, a losing trade can continue consuming equity indefinitely rather than closing at a predetermined point.
• Multiple correlated positions. Several trades that move together (such as multiple US-dollar pairs) can combine into a single, much larger effective exposure than any one trade suggests.
• Adding to a losing position. Increasing exposure to try to lower the average entry price (sometimes called “averaging down”) increases used margin and floating loss simultaneously — a pattern closely related to revenge trading.

How to Avoid a Margin Call

1. Use position sizing based on risk, not available margin. Just because your account allows a large position doesn’t mean the position fits a sound risk budget.
2. Always use a stop-loss. This caps the maximum floating loss any single position can produce, which directly caps how much your margin level can deteriorate from that trade. See how to use a stop-loss.
3. Keep meaningful free margin in reserve. Avoid opening positions that use most of your available margin, so there’s a buffer to absorb normal price fluctuation.
4. Monitor margin level, not just account balance. A broker platform typically displays margin level in real time — checking it regularly, especially with multiple open positions, gives you an early warning before a margin call is triggered.
5. Avoid stacking correlated trades. Treat correlated positions as contributing to the same overall exposure, not as separate, independent risks.

Key Takeaways

• A margin call is triggered when your account’s margin level (equity ÷ used margin) falls to a broker-defined threshold, usually as a result of floating losses.
• A stop-out is a lower, more severe threshold at which the broker automatically closes positions to prevent a negative balance.
• Margin calls are usually the result of oversized positions, missing stop-losses, or too many correlated open trades, not random bad luck.
• Disciplined position sizing and consistent stop-loss use are the most effective ways to keep margin level in a healthy range.
• Monitoring margin level in real time, not just account balance, provides an early warning before a margin call is triggered.

Risk note: Trading on margin carries a high level of risk. Losses can accumulate quickly, and in the absence of negative balance protection, it is possible to lose more than your deposited funds during extreme market moves. Margin call and stop-out levels vary by broker and account type — always confirm the specific thresholds that apply to your account before trading with leverage.