Leverage, Margin, and Margin Calls Explained (With Risk Warnings)
Leverage is one of the most powerful — and most dangerous — tools in forex trading. Understanding it properly isn't optional; it's the single most important thing standing between a manageable loss and a wiped-out account.
What is leverage?
Leverage lets you control a much larger trading position than the cash you actually have in your account. For example, with 100:1 leverage, $1,000 of your own money can control a $100,000 position. This is expressed as a ratio (like 50:1, 100:1, or higher) or sometimes as a percentage margin requirement.
What is margin?
Margin is the amount of your own money a broker requires you to set aside as collateral to open a leveraged position. If leverage is 100:1, the margin requirement is 1% — meaning $1,000 of margin lets you control a $100,000 position. Margin isn't a fee; it's your money, held aside while the trade is open.
The real risk: leverage cuts both ways
Leverage doesn't just magnify profits — it magnifies losses by exactly the same amount. A small, seemingly minor price move against you can result in a loss that's a large percentage of your actual account balance. This is genuinely how retail traders lose their entire account balance faster than they expect.
What is a margin call?
As a losing trade moves further against you, your account's available margin shrinks. When it drops below a certain threshold, your broker issues a margin call — a warning that you need to either deposit more funds or close some positions, because your account no longer has enough margin to support your open trades.
What is a stop-out?
If you don't respond to a margin call and losses continue, the broker will automatically start closing your positions once your margin falls below the "stop-out level" (often around 20-50% depending on the broker) — this is called a stop-out. It happens automatically, without your permission, specifically to prevent your account from going negative (though in extreme, fast-moving markets, even this protection can fail).
How to actually manage this risk
- Use lower leverage than the maximum your broker offers, especially as a beginner
- Always use a stop-loss on every trade
- Never risk more than a small percentage of your account on a single trade — DeskTerminal's Position Size Calculator helps you work this out precisely before you trade
- Understand that high leverage is genuinely one of the leading causes of blown trading accounts
This is educational content only, not financial advice. Leverage trading carries a high risk of losing your invested capital rapidly, and most retail forex accounts lose money. Never trade with money you cannot afford to lose.
A Concrete Margin Call Scenario
Say you have a $500 account and open a position requiring $100 in margin (at 100:1 leverage, controlling a $10,000 position). Your broker's margin call level is 100% — meaning if your account's equity (balance plus/minus open profit or loss) falls to $100 (equal to your used margin), you'll receive a margin call.
If the trade moves $400 against you, your equity drops to $100 exactly — margin call triggered. If it keeps moving against you and your broker's stop-out level is 50%, your position gets automatically closed once equity falls to $50 — locking in a loss of $450, 90% of your original account, from what may have started as a single, reasonably-sized-looking trade under high leverage. This is precisely why understanding your broker's specific margin call and stop-out percentages before trading live matters — they vary broker to broker, and the numbers can move faster than they seem like they should.
Frequently Asked Questions
What triggers a margin call?
A margin call happens when your account's available margin falls below a required threshold due to losing trades — it's a warning to deposit more funds or close positions before further losses.
What is the difference between a margin call and a stop-out?
A margin call is a warning; a stop-out is automatic — if you don't respond to a margin call and losses continue, the broker automatically closes positions once margin falls below the stop-out level, without asking permission.
Can I lose more money than I deposited?
With most regulated brokers, negative balance protection prevents this — but during extreme, fast-moving markets, it's theoretically possible to lose more than your deposit, so leverage should always be used cautiously.
How can I avoid margin calls?
Use lower leverage than the maximum offered, always set a stop-loss, and never risk more than a small percentage of your account on a single trade — position size calculators help with this precisely.