What is a Margin Call and How To Avoid it?

How a Margin Call Works

When accumulated losses push account equity below the maintenance margin requirement, the broker issues a warning automatically. This is a mechanical threshold built into the trading platform, not a manual decision.

Take a look at this example image of a downtrend in Tesla stock where several leveraged traders were margin called.

If the account lacks the required funds to support total losses, the broker may close some or all positions to reduce risk and satisfy the call.

Just as a bank requires a down payment before extending credit, a broker requires collateral to open leveraged positions. Unlike a fixed loan, a leveraged trade can lose collateral value as the market moves against it.

When collateral value falls below the broker’s safety threshold, the margin call is issued. This is the last formal warning before the broker proceeds to forced liquidation of the position.

Losses are always paid from deposited capital. Large adverse moves can consume most of the margin quickly, especially when multiple positions are open simultaneously.

When a margin call is received, there is typically a window of a few days to meet the demand. That window depends on market conditions. If the market continues to move against the open position, it can shrink to hours or minutes.

If the account cannot be brought within required limits, the broker may close some or all positions to prevent further loss.

What triggers a margin call?

These are the most common scenarios that trigger a margin call.

• A trader takes on excessive risk and the market moves against the position to the extent that account equity falls toward the margin threshold.
• A trader opens several positions simultaneously without checking the combined margin requirement.
• A single trade consumes most of the available collateral, leaving no buffer for adverse price movement.

Leverage lets traders control larger positions using less capital, but collateral must always cover losses.

Margin is the minimum amount of capital required to keep a position open. Specifically, a margin call fires when account equity falls below the broker’s maintenance margin requirement: the minimum collateral ratio required to maintain an open position.

If the value of a trade falls below the maintenance requirement, the broker issues a warning requesting additional funds to meet the minimum margin ratio.

All leveraged brokers apply different ratios for borrowed fund usage. Margin requirements vary by platform. Lower thresholds increase the probability of a margin call and accelerate loss.

At what percentage does a margin call fire?

The threshold varies by broker and asset class, typically between 2% and 50% of total position value.

Leveraged stock brokers tend to apply stricter requirements, sometimes up to 50%, while many high-leverage forex brokers may require only a 2% collateral ratio. The wide range reflects differences in asset volatility, broker risk appetite, and regulatory jurisdiction.

At a 50% requirement, an account with $1,000 in collateral would trigger a margin call if that value fell below $500.

Margin calls can also be triggered by opening a second position using leftover capital, leaving no buffer for adverse moves. Most leverage brokers prevent this, but some platforms allow it.

An example of a typical situation

A margin call fires when a leveraged position loses enough value to push collateral below the broker’s maintenance threshold.

A trader buys $8,400 worth of a US equity index ETF at 2x leverage, depositing $4,200 and borrowing $4,200 from the broker. The broker’s maintenance margin requirement is 30%. If the ETF falls in value to $6,000, the trader’s equity drops to $1,800, which equals the 30% maintenance threshold. The broker issues a margin call requiring additional funds or a partial position close.

In a forex example: a trader opens a $75,000 position at 50:1 leverage, with $2,200 in the account. The broker’s maintenance requirement is 2% of position value, or $1,500. When an adverse move drops account equity to $1,500, the margin call fires. Without a deposit or partial position close, the broker proceeds to liquidation to prevent the account from going negative.

Before opening a leveraged position, the liquidation price calculator identifies the exact price level at which the broker would close the position, giving a concrete number to plan around.

What to Do When You Receive a Margin Call

Your options when a margin call arrives

When a margin call arrives, there are three realistic responses.

1. Closing the position: If the market is moving strongly against the trade and a reversal is not supported by the analysis, closing some or all of the position is the most straightforward response. Adding collateral keeps the trade open, but only makes sense when the position itself is valid. Depositing funds to extend a position that is clearly failing is a pattern that tends to deepen losses rather than recover them.
2. Depositing more funds: An option when the adverse move appears to be a temporary dip with identifiable recovery catalysts. A rebound is never guaranteed. A margin call more often signals a planning error than a brief market overreaction.
3. Waiting without action: The highest-risk response. Doing nothing leaves the market in control of the position. The ability to manage risk is surrendered at this point.

What happens if you do nothing?

Ignoring a margin call typically accelerates loss. As account equity continues to fall with no response, the broker proceeds to close positions automatically to recover the borrowed capital.

If the position continues to deteriorate, the broker closes it at whatever price is available, which may be less favorable than the trader would have chosen independently. The margin call is the last formal opportunity to take control. Once ignored, the broker acts unilaterally.

A margin call is not a demand for payment. It is a notification that collateral has dropped to the maintenance threshold. When left unaddressed and losses continue, the broker’s next action is forced liquidation. For a full breakdown of how a margin call differs from liquidation and what happens at each stage, see the guide to margin call vs. liquidation.

How to Avoid a Margin Call

How traders manage margin risk

Margin calls are not random events. Most originate from the same structural errors: oversized positions, inadequate collateral buffers, or incomplete understanding of how leverage affects margin exposure. The following practices reduce that risk, though none eliminate it entirely.

1. Regular account monitoring: Tracking both position value and remaining collateral allows early detection of deteriorating positions before the margin threshold is reached. Accounts approaching the threshold tend to do so gradually, and early detection allows a controlled response.
2. Position sizing within risk tolerance: Adding to a losing position to recover losses increases exposure when collateral is already under pressure. Consistent oversizing is the most common structural cause of margin calls.
3. Stop-loss orders: A stop-loss order closes a position automatically when the price reaches a specified level. Traders use stop-losses to prevent positions from approaching the margin call threshold in the first place.
4. Lower leverage ratios: Lower leverage leaves more collateral available relative to position size. A smaller adverse price move is required to trigger a margin call at high leverage. Lower leverage increases the buffer before the maintenance threshold is reached.
5. Isolated margin mode: For crypto derivatives and some other platforms, isolated margin limits a single position’s potential losses to the collateral allocated to that trade. A loss on one position cannot consume margin from the broader account.

For a broader framework on managing leverage risk across positions, the guide to risk management in leveraged trading covers position sizing, stop-loss placement, and collateral planning in detail.

Conclusion

The purpose of a margin call is to protect the broker against losses and to protect the investor from liquidation.

Frequent margin calls usually point to poor sizing or a misunderstanding of how collateral interacts with volatility.

A margin call is not a penalty. It is a mechanical threshold that protects both the broker and the trader’s remaining capital.