Required Margin
Required margin is the minimum amount of capital a broker locks in your trading account to keep a leveraged position open.
Quick Definition Box
Required margin is the deposit your broker holds as collateral when you open a leveraged trade. It is not a cost or fee — it is a security reserve that is released back to you when you close the position. The amount is calculated by dividing the notional position size by the leverage ratio.
Detailed Explanation
When you trade on margin, you are borrowing funds from your broker to control a larger position than your account balance would normally allow. The required margin is the portion of your own money that the broker "freezes" to guarantee that you can cover potential losses on that borrowed amount.
The formula is straightforward:
Required Margin = (Position Size × Contract Size) ÷ Leverage
Let's break this down with a concrete example. Suppose you want to trade 1 standard lot of EUR/USD. One standard lot equals 100,000 units of the base currency (EUR). If the current exchange rate is 1.1000, the notional value of the position is $110,000.
If your broker offers 1:30 leverage (common for retail forex in many regulated jurisdictions), the required margin would be:
$110,000 ÷ 30 = $3,666.67
This means you need at least $3,666.67 in free margin in your account to open this position. The remaining balance in your account is called "free margin" or "available margin," which can be used to open additional positions or absorb floating losses.
The required margin changes as the market moves. If the price of EUR/USD rises, the notional value of your position increases, and the required margin may increase slightly. Conversely, if the price falls, the required margin decreases. However, most brokers recalculate margin in real-time based on the current market price.
It is critical to understand that required margin is not a transaction cost. Unlike spreads, commissions, or swaps, the margin is not deducted from your account balance. It is simply "reserved" while your position is open. When you close the position, the margin is released back into your available balance.
The concept becomes more complex with multiple open positions. Your broker calculates the total required margin across all open positions. If your account equity (balance plus or minus floating profit/loss) falls below the total required margin, you will receive a margin call. If you fail to deposit more funds, the broker will automatically close your positions to prevent your account from going negative — this is called a stop-out.
Real-World Example
Let's walk through a realistic trading scenario to see required margin in action.
Account Setup:
- Account balance: $10,000
- Leverage: 1:100
- Instrument: USD/JPY (1 lot = 100,000 USD)
Step 1: Opening a Position You decide to buy 1 lot of USD/JPY at 150.00. The notional value is $100,000 (100,000 USD × 1).
Required margin = $100,000 ÷ 100 = $1,000
After opening this position:
- Used margin: $1,000
- Free margin: $9,000
- Account equity: $10,000
Step 2: Adding a Second Position You also want to sell 2 lots of GBP/USD at 1.2500. Each lot is 100,000 GBP, so the notional value per lot is $125,000 (100,000 × 1.25). For 2 lots, the total notional is $250,000.
Required margin for this position = $250,000 ÷ 100 = $2,500
Now your total used margin is $1,000 + $2,500 = $3,500. Your free margin is $10,000 - $3,500 = $6,500.
Step 3: Market Moves Against You The market moves against both positions. Your floating loss reaches $6,500. Your account equity is now $10,000 - $6,500 = $3,500.
At this point, your equity equals your used margin. You have zero free margin. Any further adverse movement will trigger a margin call. If the loss reaches $8,500 (equity = $1,500), your broker may stop out your positions, depending on the stop-out level (often 50% of required margin, meaning equity must stay above $1,750 in this case).
This example shows how required margin directly determines how much room you have before a margin call. The higher the leverage, the lower the required margin, but the smaller the buffer for adverse price movements.
Why It Matters for Traders
Understanding required margin is fundamental to survival in leveraged trading. It directly impacts your ability to withstand market volatility and determines how many positions you can hold simultaneously.
First, required margin sets your maximum position size. If you know your account balance and the leverage offered, you can calculate the largest position you can open. This prevents you from accidentally over-leveraging and facing immediate margin calls.
Second, required margin affects your risk of liquidation. A position that requires a large portion of your account equity leaves little room for price fluctuations. Even a small adverse move can wipe out your free margin and trigger a stop-out. This is why professional traders often use the two-percent-rule — risking only 2% of their account per trade — to ensure that even a series of losses does not bring them close to the margin threshold.
Third, required margin interacts with drawdown. A deep drawdown reduces your equity, which in turn reduces your free margin. If you are already using a large portion of your margin, a drawdown can force you to close positions at the worst possible time, locking in losses and preventing recovery.
Finally, required margin is the foundation of money-management. Without a clear understanding of how much margin each position consumes, you cannot properly size your trades relative to your account. This is where tools like the kelly-criterion and risk-reward analysis come into play — they help you determine optimal position sizes that keep your margin usage within safe limits.
Common Misconceptions
Misconception 1: "Required margin is a fee or cost." This is false. Required margin is collateral that is returned to you when you close the position. The actual costs of trading are spreads, commissions, and swap rates. Confusing margin with costs leads traders to underestimate their true expenses and overestimate their profitability.
Misconception 2: "Higher leverage means higher risk of losing more than your deposit." While higher leverage does increase the speed at which losses can accumulate, the risk of losing more than your deposit is mitigated by the broker's stop-out mechanism. However, in extreme market conditions (e.g., flash crashes or gaps), slippage can cause negative balances. This is why many regulated brokers offer negative balance protection. The real risk of high leverage is not the margin itself, but the reduced buffer it provides against normal market fluctuations.
Misconception 3: "If I have enough margin, my position is safe." Having sufficient required margin only means your position is open. It does not protect you from losses. A position can be fully margined and still lose 50% of its value. Margin is about collateral, not about the quality of the trade. Your risk management should focus on stop-losses and position sizing, not just on maintaining margin levels.
Related Terms
How XM Compares
XM, like most regulated forex brokers, provides leverage options that determine your required margin. The exact leverage available depends on your account type, jurisdiction, and the instrument you are trading. For example, XM offers leverage up to 1:888 for certain account types, but this is subject to regulatory limits in your country of residence. The required margin calculation follows the standard formula described above, and XM provides a margin calculator on their website to help traders determine the margin needed for specific positions. Always check the current leverage and margin requirements on XM's official pages, as these can change based on market conditions and regulatory updates.
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⚠️ This glossary entry is educational. Forex/CFD trading carries high risk. This is not investment advice.
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