Key Takeaways
- Leverage lets a small deposit control a large position.
- That sounds like an advantage until you do the maths on what a 50-pip adverse move actually costs.
- Here is how margin, leverage, and account equity interact — with the numbers laid bare.
Leverage is the mechanism by which a small deposit (margin) controls a much larger market position. It is the single most-quoted feature of retail CFD trading and the single most-misunderstood. Understanding it properly takes ten minutes. Misunderstanding it costs accounts.
The core idea, in one sentence
If your broker requires 1% margin, you are trading at 1:100 leverage — your USD 1,000 of margin controls USD 100,000 of notional exposure. If they require 0.2%, you are trading at 1:500. The ratio is just two ways of saying the same thing.
What margin actually is
Margin is not a fee. It is collateral. When you open a position, the broker sets aside a slice of your account equity equal to the margin requirement for that position. You still own the equity, but it is locked, unable to support other trades, until the position is closed.
Three numbers are visible at all times in your platform:
- Equity — the real-time value of your account, including unrealised P&L from open positions.
- Used margin — the collateral currently locked behind open positions.
- Free margin — equity minus used margin. The buffer you have for adverse moves and for opening new positions.
A worked comparison: 1:100 vs 1:500 on the same trade
Suppose two traders, A and B, each have a USD 10,000 account. Both want to go long 1 standard lot of EUR/USD at 1.0850. The notional exposure is the same: USD 108,500.
- Trader A chooses 1:100 leverage. Margin required: USD 1,085. Free margin after opening: USD 8,915.
- Trader B chooses 1:500 leverage. Margin required: USD 217. Free margin after opening: USD 9,783.
Now EUR/USD moves 100 pips against them, down to 1.0750. Both traders lose the same USD 1,000 (1 lot × 100 pips × USD 10/pip). After the move:
- Trader A: equity USD 9,000, used margin USD 1,075, free margin USD 7,925. Position still open with plenty of buffer.
- Trader B: equity USD 9,000, used margin USD 215, free margin USD 8,785. Same equity, but with more free margin because she committed less collateral.
So far, leverage looks irrelevant — the P&L on the trade itself is the same. This is the most important observation in this article. Leverage does not change the gain or loss on any individual trade. What it changes is how much exposure you can accumulate.
Where leverage actually hurts you
The danger of high leverage is not the individual trade. It is the temptation to open positions you could not otherwise have opened.
Trader B, looking at her USD 9,783 of free margin and her 1:500 leverage, sees that she could open another four 1-lot positions and still have buffer. She does. Now she has 5 lots open. A 100-pip move against her loses USD 5,000, half her account, on a single normal day's range in EUR/USD.
Trader A, with 1:100 leverage, cannot make that mistake. The broker's margin requirement physically prevents her from holding five 1-lot positions on a USD 10,000 account. The lower leverage is acting as a circuit breaker on her own decision-making.
This is the dynamic behind most high-leverage account blow-ups. Not a single bad trade. A cluster of normal trades, sized at what the leverage permits rather than what the account can absorb.
Margin call and stop-out — what actually happens
Every broker defines two levels expressed as a percentage of equity to used margin (the "margin level"):
- Margin call level — a warning. At TopWealth this is typically 100% (equity equal to used margin). At this point you cannot open new positions; existing ones remain.
- Stop-out level — automatic liquidation. Typically 50%. When margin level falls to this threshold, the system begins closing your most loss-making positions one at a time until the level recovers above stop-out.
Stop-out is the broker's protection mechanism, not yours. It exists to prevent your account from going negative (and the broker from being on the hook for the shortfall). By the time it triggers, you have lost more than half your equity. Treat stop-out as the floor of catastrophe, not as a risk management tool.
How to choose your leverage
The leverage you select on account opening sets the ceiling, not the floor. You can always trade at lower effective leverage by sizing your positions smaller. You cannot trade above your account's selected ceiling.
For most retail traders, the right answer is:
- Select a leverage tier that matches the largest position you intend to hold, with some headroom (say, 2× the margin you would normally need).
- Size individual trades according to a fixed-percentage risk rule (typically 1% of equity per trade), independent of what the leverage allows.
- Use the platform's leverage selector as a discipline tool. A trader who genuinely never sizes above 2% of equity per trade does not need 1:500 leverage. A trader who often does should not have it.
1:500 is appropriate for experienced traders running tight, mechanical strategies who want maximum capital efficiency. For everyone else, the lower tiers (1:100, 1:200) are the conservative choice — not because the per-trade outcome is different, but because the temptation to over-position is the real risk.
The one rule worth memorising
Your position size should be determined by your stop loss distance and your risk-per-trade budget — never by what the platform's "maximum lots" calculator tells you is available. The maximum is the ceiling of disaster. The right size is whatever the maths of risk management produces, which is usually a small fraction of that ceiling.
This article is general information about leveraged CFD trading and does not constitute personal advice. CFDs are complex leveraged products and carry a high risk of losing money rapidly. You should consider whether you understand how CFDs work and whether you can afford the high risk of losing your money. Past performance is not indicative of future results.
