Margin is one of the first ideas new traders meet, and also one of the most misunderstood. With a forex margin call explained step by step, this guide covers used margin, free margin, margin level and stop-outs, then walks through a hypothetical example so you can see exactly how an account reaches the point where positions start closing.
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Risk warning: Trading forex and CFDs on margin carries a high risk of losing money quickly due to leverage. Only trade with money you can afford to lose, and make sure you understand how these products work.
What margin actually is
Margin is the amount of money a broker sets aside from your account to keep a leveraged position open. It is not a fee, and it is not spent. Instead, think of it as a good-faith deposit that the broker locks while the trade is running.
Leverage determines how much margin you need. For example, with leverage of 1:30, you need margin equal to roughly one-thirtieth of the position’s value. With 1:10, you need one-tenth. The higher the leverage, the less margin each position ties up, and the larger the position you can open relative to your balance.
That sounds convenient. However, profits and losses still follow the full position size, not the margin. As a result, leverage makes your account far more sensitive to price moves.
The CFTC’s Learn and Protect pages include educational material on the risks of leveraged retail forex trading, and they are worth reading alongside this guide.
The key terms on your trading screen
Most trading platforms show a handful of numbers that together tell you how close you are to trouble. Here is what each one means.
Balance
Your balance is the money in the account from closed trades and deposits, minus withdrawals. It does not include profit or loss on positions that are still open.
Equity
Equity is your balance plus or minus the floating profit or loss on open positions. In other words, it is what the account would be worth if you closed everything right now.
Used margin
Used margin is the total margin locked by all your open positions.
Free margin
Free margin is equity minus used margin. It is the cushion available to absorb losses or open new trades. When free margin shrinks toward zero, you have very little room left.
Margin level
Margin level is equity divided by used margin, shown as a percentage. The formula is:
Margin level = (Equity ÷ Used margin) × 100
A higher margin level means more breathing room. A falling margin level is the main warning sign that a margin call or stop-out is getting closer.
Forex margin call explained
A margin call happens when your margin level falls to a threshold set by your broker. At that point, the broker warns you that your account no longer has much cushion. Typically, you may be unable to open new positions until the margin level recovers.
Historically, a margin call meant a phone call asking for more money. Today it is usually an automatic alert on the platform or by email. Either way, the message is the same: your losses are eating into the margin that supports your trades.
Importantly, the exact threshold varies between brokers and account types. Some brokers combine the margin call and stop-out into a single level. Therefore, always check the specific figures in your own account terms rather than assuming.
How a stop-out is triggered
A stop-out is the next stage. If your margin level keeps falling and reaches the broker’s stop-out level, the platform starts closing positions automatically. It usually closes the position with the largest loss first, then rechecks the margin level, and repeats until the account is back above the threshold.
The purpose is to stop the account from going deeper into loss. Nevertheless, a stop-out locks in the losses on whichever positions it closes, and it happens without asking you first.
In fast or gapping markets, the stop-out may be filled at a worse price than the level suggests. That is why understanding negative balance protection is also important.
A hypothetical worked example
The figures below are invented to illustrate the mechanics. The thresholds are examples only; your broker’s levels may be different.
Assume a broker sets a margin call level of 100% and a stop-out level of 50%.
- Deposit and balance: 2,000 units of your account currency.
- Position size: 30,000 units.
- Leverage: 1:30, so used margin is 30,000 ÷ 30 = 1,000.
- Starting equity: 2,000.
- Starting margin level: (2,000 ÷ 1,000) × 100 = 200%.
- Starting free margin: 2,000 − 1,000 = 1,000.
Now the market moves against you.
| Price move against you | Floating loss | Equity | Margin level | What happens |
|---|---|---|---|---|
| 1% | 300 | 1,700 | 170% | Nothing yet, but cushion is shrinking |
| 2% | 600 | 1,400 | 140% | Still open |
| About 3.3% | 1,000 | 1,000 | 100% | Margin call alert |
| 5% | 1,500 | 500 | 50% | Stop-out closes the position |
Notice how quickly this happens. A 5% move on the position wiped out three-quarters of the deposit. With higher leverage, the same move would cause even more damage. Results in real trading vary and depend on many factors, including spreads, swaps and execution.
How to avoid reaching a margin call
You cannot control the market, but you can control how exposed you are. These habits help keep your margin level healthy:
- Use less leverage than the maximum available. Smaller positions relative to your balance mean more room for adverse moves.
- Size positions by risk, not by margin. Decide how much of your account you are willing to lose on a trade, then work backwards to the position size.
- Set stop-losses deliberately. A stop-loss you choose is usually better than a stop-out the broker chooses.
- Watch your margin level, not just profit and loss. Keep an eye on it whenever positions are open.
- Be careful with many positions at once. Several correlated trades can push margin usage up quickly.
- Know your broker’s thresholds. Find the margin call and stop-out levels in your account terms before you trade.
The SEC’s investor education site, Investor.gov, also explains general concepts such as leverage and risk in plain language.
How bonuses can complicate the picture
Some promotions add non-withdrawable credit to your account. That credit may count toward equity, which can make your margin level look healthier than your own money alone would justify. If the credit is later removed, your margin level can drop sharply. Before accepting any offer, read how it affects margin. Our guides on bonus strategies cover what to look for in the terms.
Frequently asked questions
Is a margin call the same as a stop-out?
No. A margin call is a warning at one threshold. A stop-out is the automatic closing of positions at a lower threshold. Some brokers use a single level for both.
Can I add funds to avoid a stop-out?
Depositing more money increases equity and therefore your margin level. However, adding money to a losing position can also increase what you eventually lose, so think carefully before doing it.
Why did my position close before my stop-loss?
If your margin level reached the stop-out threshold first, the platform may have closed the position before price reached your stop-loss.
The bottom line
With the forex margin call explained, the logic is simple: losses reduce equity, falling equity reduces margin level, and once margin level hits your broker’s thresholds, you get a warning and then automatic closures. Keep leverage modest, size positions carefully and always know your broker’s margin call and stop-out levels.
This article is for educational purposes only and is not financial, investment or legal advice. Rules differ by country and change over time — check the current rules with the relevant regulator and consider speaking to a licensed financial adviser.
