Whenever you start FX trading, the word “leverage” inevitably comes up. It is widely known as a mechanism that lets you trade large amounts with little capital, but using it without a proper understanding of how it actually works can lead to unexpected losses. In this article, our research lab systematically covers everything from the definition of leverage and margin calculation formulas, to its relationship with stop-out (loss cut), and the misconceptions beginners are most likely to fall into.
Definition and Mechanism of Leverage
Leverage means “lever,” and refers to a mechanism that allows you to trade amounts many times larger than the margin you deposit as collateral. For example, with 25x leverage, you can buy and sell currency worth up to 2,500,000 yen using a margin of 100,000 yen.
The key point is that leverage is not about “borrowing money to increase your funds” — it is an indicator expressing the ratio of the tradeable amount relative to your deposited margin. Domestic FX brokers in Japan are regulated by the Financial Services Agency (FSA), which limits individual account leverage to a maximum of 25x. Overseas brokers, on the other hand, offer accounts with leverage of several hundred to over 1,000x, meaning the scale of trading possible with the same margin varies enormously.
The higher the leverage, the less capital you need to start trading, but both profits and losses are amplified by the same multiplier. In other words, leverage itself is a neutral tool — it is “position size,” discussed below, that determines the actual magnitude of risk.
Concrete Examples and the Required Margin Formula
Required margin is calculated using the following formula.
Required Margin = Trade Volume x Exchange Rate / Leverage
For example, when USD/JPY is 1 USD = 150 JPY, if you trade 10,000 units (10,000 USD), the required margin changes as follows depending on leverage.
| Leverage | Trade Value (10,000 USD = approx. 1,500,000 JPY) | Required Margin |
|---|---|---|
| 1x | 1,500,000 JPY | 1,500,000 JPY |
| 5x | 1,500,000 JPY | 300,000 JPY |
| 25x | 1,500,000 JPY | 60,000 JPY |
| 100x | 1,500,000 JPY | 15,000 JPY |
Even for the same 10,000 units, with 25x leverage you can trade with 60,000 JPY in margin, and with 100x leverage, just 15,000 JPY. What is often overlooked here is that the trade volume (10,000 units) and the profit/loss amount remain constant regardless of leverage. If the exchange rate moves by 1 yen, the profit or loss is 10,000 yen — and this does not change no matter what the leverage multiplier is.
What “changes” with higher leverage is the margin buffer relative to your account balance. Whether you are trading with 60,000 JPY in margin or 15,000 JPY, the range of price movement your account can withstand for the same trade differs significantly.
Common Pitfalls for Beginners
Misunderstanding leverage is a major factor that rapidly depletes beginners’ funds. Below are the points our research lab considers particularly important to be aware of.
- Oversimplifying “high leverage = dangerous”: What is dangerous is not the leverage number itself, but holding a position that is oversized relative to your account balance. Even with a 100x account, keeping your volume low will keep your effective leverage low.
- Allocating your entire account balance to margin (full leverage): Trading with just barely enough required margin means even a small adverse move can trigger a stop-out. The “effective leverage” you are actually operating at must be calculated based on your total account balance.
- Not knowing your stop-out level: Most brokers will forcibly close positions when the margin maintenance ratio falls below a certain threshold (e.g., 50% or 100%). Trading without calculating in advance at what price a stop-out will be triggered is dangerous.
- Leaving unrealized losses unattended while continuously adding margin: Driven by reluctance to realize losses, repeatedly depositing more funds or averaging down causes losses to snowball. From a money management perspective, this is behavior to avoid.
These issues cannot be resolved simply by thinking “lower leverage = safer.” The essence lies in managing trade volume, account balance, and stop-loss price together as a set. Why a strategy premised on averaging down is dangerous is also examined in our article Why Averaging-Down EAs Experience Deep Drawdowns.
FX AI Lab’s View
Our research lab positions leverage not as “the size of risk” but as “a tool for adjusting capital efficiency.” What matters is not the numerical value itself, but codifying effective leverage relative to account balance and stop-loss design into a rule-based system. In the automated trading (EA) and copy trading we are currently testing at our lab, we also operate on the premise of a design that determines position size by working backward from the assumed maximum drawdown. Translating discretionary, emotion-prone money management into verifiable logic — this is our lab’s consistent policy. For the account environment that forms the basis of live operations, please refer to the related links below.
Related Links
This article is intended for informational purposes only and does not constitute a recommendation of any specific trade or investment. FX is not a financial product that guarantees the return of principal, and market fluctuations may result in losses exceeding the margin deposited. Before trading, please be sure to review the risk disclosure documents provided by your broker, and make all decisions and take full responsibility yourself.