When you trade Contracts for Difference (CFDs), you are using leverage, a mechanism that amplifies both gains and losses. The broker requires you to deposit a fraction of the total trade value as margin. If the market moves against your position, your equity shrinks, and the broker may issue a margin call or even liquidate your position automatically. Understanding exactly what happens, and how to prevent it, is essential for anyone trading CFDs, whether you are a beginner or an experienced speculator.

This article walks through the mechanics of margin, the sequence of events during a margin call, and the practical steps you can take to protect your account. We use concrete examples with real numbers and refer to common broker practices in the UK and EU.

What Is Margin in CFD Trading?

Margin is the amount of capital you must deposit to open and maintain a leveraged position. It is expressed as a percentage of the total trade value. For example, if you want to trade £10,000 worth of shares in Barclays PLC with a 10% margin requirement, you only need to put down £1,000. The broker lends you the remaining £9,000.

Margin requirements vary by asset class, volatility, and regulatory jurisdiction. Under ESMA (European Securities and Markets Authority) rules, retail clients face leverage limits: 30:1 for major currency pairs (3.33% margin), 20:1 for non-major FX, gold and major indices (5%), 10:1 for commodities and non-major indices (10%), 5:1 for individual equities (20%), and 2:1 for cryptocurrencies (50%).

For a detailed explanation of how margin works in practice, see our article Margin Requirements.

Initial Margin vs Maintenance Margin

There are two key margin concepts:

  • Initial margin, the deposit required to open a new position.
  • Maintenance margin, the minimum equity you must maintain in your account to keep the position open. If your equity falls below this level, the broker issues a margin call.

For retail clients, most brokers set the maintenance margin at the same level as the initial margin (or slightly lower). For example, on a 10:1 leveraged trade, the initial margin might be 10%, and the maintenance margin might be 5%. Once your equity drops below 5% of the trade value, you receive a margin call.

What Triggers a Margin Call?

A margin call occurs when your account equity (balance + unrealised profit/loss) falls below the maintenance margin requirement. This happens because the market moves against your open position.

Consider a concrete example:

  • You deposit £5,000 into your CFD account.
  • You buy 1,000 shares of Tesco PLC at £2.50 per share, total trade value £2,500.
  • Your broker requires 20% initial margin for UK equities (5:1 leverage). You therefore put up £500 as margin.
  • Your free equity is £4,500 (£5,000 - £500).
  • The maintenance margin is also 20% (£500).

Now imagine Tesco's share price drops to £2.00. Your position is now worth £2,000, a loss of £500. Your account equity becomes £4,500 (£5,000 initial deposit minus £500 loss). But the maintenance margin requirement is still 20% of the current trade value: 20% × £2,000 = £400. Since your equity (£4,500) is well above £400, no margin call is triggered yet.

However, if Tesco's price falls to £1.00, your position is worth £1,000, a loss of £1,500. Your equity is now £3,500. The maintenance margin is 20% of £1,000 = £200. Still above. But if the price falls to £0.50, your position is worth £500, loss of £2,000, equity £3,000, maintenance margin 20% × £500 = £100. Still safe.

In this example, the drop would need to be extreme before a margin call. But if you had used maximum leverage (say 20:1 on a major index), a 5% adverse move could wipe out your entire margin.

Let us use a more typical scenario with higher leverage:

  • You deposit £2,000.
  • You buy 1 CFD contract on the FTSE 100 at 7,000 points, each contract worth £10 per point, total notional £70,000.
  • Your broker requires 5% initial margin (20:1 leverage): £3,500. But you only have £2,000, you cannot open this trade. So you adjust: you buy 0.5 contracts, notional £35,000, margin 5% = £1,750. Your free equity is £250.
  • Maintenance margin is 5% of current notional.

If the FTSE 100 falls by 100 points, your loss is 100 × £10 × 0.5 = £500. Your equity becomes £1,500. The maintenance margin on the reduced notional (7,000 - 100 = 6,900 points; notional = 6,900 × £10 × 0.5 = £34,500; 5% = £1,725). Your equity (£1,500) is now below the maintenance margin (£1,725). The broker issues a margin call.

What Happens During a Margin Call?

When a margin call is triggered, the broker will typically:

  1. Notify you via email, SMS, or platform alert. The notification states the amount of additional funds required to bring your equity back above the maintenance margin (or to the initial margin level, depending on the broker).
  2. Give you a deadline, often 24 hours, but some brokers require immediate action, especially in volatile markets.
  3. Automatically liquidate positions if you fail to deposit funds within the deadline. Some brokers start liquidating immediately, without warning, if your equity falls below a certain threshold (e.g., 50% of maintenance margin). This is called stop-out.

The broker's goal is to protect itself from credit risk. If your loss exceeds your deposit, the broker would be left with a bad debt. Therefore, brokers enforce strict liquidation policies.

Most brokers use a stop-out level expressed as a percentage of the maintenance margin. For example, if your equity falls to 80% of the maintenance margin, the broker will start closing positions automatically, usually starting with the largest or most volatile position.

For a broader understanding of how leverage and margin interact, read Leverage in CFDs.

Liquidation: How Brokers Close Your Positions

Liquidation means the broker forcibly closes your open positions to bring your margin usage back within acceptable limits. The broker will sell (or buy back) your positions at the current market price. This often happens during fast-moving markets, and the price at which the position is closed may be worse than the last quoted price due to slippage.

For example, during the Swiss franc crisis of January 2015, many brokers liquidated clients' positions at prices far below the stop-loss levels because the market gapped. Some clients ended up owing money to the broker (negative balance).

Key points about liquidation:

  • It is automatic and cannot be reversed.
  • The broker typically closes positions in a specific order: usually the most leveraged or the largest position first.
  • If liquidation of one position is not enough to bring margin above the threshold, the broker will continue closing positions until the requirement is met.
  • Any remaining equity after liquidation is returned to your account.

In some cases, particularly with high leverage and extreme volatility, the entire account can be wiped out, and you may even end up with a negative balance. However, under ESMA rules, retail clients are protected by negative balance protection, meaning you cannot lose more than your deposited funds. This protection does not apply to professional clients.

How to Avoid Margin Calls and Liquidation

While margin calls are sometimes unavoidable, you can take several practical steps to reduce the risk:

  • Use lower leverage. Instead of using the maximum allowed, choose a leverage ratio that gives you a comfortable buffer. For example, if the maximum is 30:1, consider using 10:1 or 5:1.
  • Set stop-loss orders. A stop-loss closes your position automatically at a predetermined price level. This limits your loss. For example, if you buy Tesco at £2.50, set a stop-loss at £2.20. Your maximum loss is 30p per share.
  • Monitor your positions regularly. Markets can move quickly. If you cannot watch the screen, consider setting price alerts or using guaranteed stop-loss orders (GSLOs) for an extra fee.
  • Diversify your trades. Do not put all your capital into one position. Spread your risk across different assets.
  • Keep sufficient free equity. Always maintain a cushion of free cash in your account to absorb small adverse moves.

For an in-depth look at the differences between trading CFDs and owning the underlying asset, see CFD vs Owning Asset.

Real-World Example: Margin Call on a Gold CFD

Let's examine a realistic scenario using gold CFDs. Suppose you trade gold with a broker that requires 5% margin (20:1 leverage). You deposit £10,000.

  • Gold price: $1,900 per ounce.
  • You buy 10 ounces (10 CFD contracts) at $1,900, total notional $19,000.
  • Margin required: 5% × $19,000 = $950.
  • Your free equity: $10,000 - $950 = $9,050.
  • Maintenance margin: 5% (same as initial).

Now gold falls to $1,850. Your loss is ($1,900 - $1,850) × 10 = $500. Equity becomes $9,500. Maintenance margin on new notional ($18,500) = $925. Equity ($9,500) > $925, no margin call.

Gold falls further to $1,800. Loss = $1,000. Equity = $9,000. Maintenance margin on $18,000 notional = $900. Still safe.

Gold drops to $1,700. Loss = $2,000. Equity = $8,000. Maintenance margin on $17,000 = $850. Still safe.

But if gold crashes to $1,500, loss = $4,000, equity = $6,000, maintenance margin on $15,000 = $750. Still fine. In this case, the low leverage (20:1) and the small position size relative to your capital mean you can withstand a significant drop. However, if you had used all your £10,000 as margin by buying 105 ounces (notional $199,500, margin $9,975), a 5% drop in gold would wipe out nearly all your equity and trigger a margin call.

This illustrates the importance of position sizing.

Margin Call on Short Positions

Margin calls can also happen on short positions (when you bet the price will fall). If the price rises instead, your loss increases and your equity shrinks. The same mechanics apply: the broker calculates the maintenance margin based on the current notional value, and if equity falls below, a margin call occurs.

For a detailed explanation of long and short positions, see Long vs Short Positions.

What to Do If You Receive a Margin Call

If you receive a margin call, you have three options:

  1. Deposit additional funds into your account to bring equity above the maintenance margin. This is the most straightforward solution.
  2. Close some positions to reduce the margin requirement. By closing a losing position, you free up margin and reduce the notional exposure. However, this realises the loss.
  3. Do nothing, the broker will liquidate positions for you. This is the worst option because you lose control over which positions are closed and at what price.

If you choose to deposit funds, act quickly. Some brokers require the funds to be cleared before they consider the margin call satisfied. Credit card deposits are instant, but bank transfers can take days.

Margin Call vs Stop-Out Level

Some brokers differentiate between a margin call and a stop-out level. A margin call is a warning; a stop-out is the actual liquidation. For example:

  • Margin call at 100% of maintenance margin (equity equals requirement).
  • Stop-out at 50% of maintenance margin (equity falls to half of requirement).

Once the stop-out level is reached, the broker immediately starts closing positions without further notice. This is common in forex and CFD trading platforms like MetaTrader 4 and MetaTrader 5.

For a comprehensive overview of how CFDs work from start to finish, refer to The Complete Guide to Contracts for Difference.

Regulatory Protections and Warnings

In the UK, the Financial Conduct Authority (FCA) requires brokers to provide clear risk warnings and to offer negative balance protection to retail clients. Similar rules apply across the EU under ESMA. Brokers must also display the percentage of retail clients who lose money trading CFDs, often between 70% and 80%.

Always read the Key Information Document (KID) provided by your broker. It contains the specific margin requirements, stop-out levels, and leverage limits for each asset class.

If you are new to CFDs, start with a demo account to practise managing margin and avoiding liquidation without risking real money. Many brokers, including IG Group, CMC Markets, and Plus500, offer free demo accounts with virtual funds.

Conclusion

Margin calls and liquidation are inherent risks of leveraged CFD trading. They occur when the market moves against your position and your account equity drops below the required maintenance margin. The best defence is to use conservative leverage, set stop-losses, monitor your positions, and keep a cash buffer. Understanding the mechanics of margin, initial margin, maintenance margin, and stop-out levels, allows you to trade with greater confidence and control.

Remember that leverage is a double-edged sword. It can magnify profits, but it can also lead to total loss of your deposited funds. Always trade within your risk tolerance and never risk money you cannot afford to lose.

For more on the fundamental differences between going long and short, see What Is a CFD.

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