How Leverage and Margin Actually Work on a CFD Account
Understanding how leverage and margin work on a CFD account is the single most useful thing you can do before placing a live trade, because it explains why small price moves can produce outsized gains — and outsized losses — on your deposit. This guide breaks down the mechanics in plain terms, with the actual formulas and a worked example, so you can check your own account instead of guessing.
What Leverage Actually Means
Leverage lets you open a position bigger than your cash deposit by borrowing the rest of the exposure from your broker. It's expressed as a ratio, like 30:1 or 100:1.
- 30:1 leverage means £1,000 of your own money can control a £30,000 position.
- The bigger the position, the bigger the pound-per-pip value, so both profits and losses scale up in cash terms.
- Leverage does not change your percentage return on the market move — it changes your return on your own capital.
A 1% move on a £30,000 position is £300. On a £1,000 deposit, that's a 30% swing. This is the core trade-off: leverage magnifies outcomes relative to what you actually put down, which is why position sizing matters far more than the leverage number printed on your account.
Leverage ratios differ by instrument (major FX pairs typically get higher leverage than shares or indices) and by regulatory regime. Don't assume your leverage is the same across every symbol — check it per instrument in your platform.
Margin Explained: The Deposit Behind Every Trade
Margin is the slice of your account equity that your broker sets aside as a good-faith deposit while a leveraged position is open. It is not a fee and it isn't spent — it's reserved, and released back to you when you close the trade.
Two numbers matter here:
- Required margin = position size ÷ leverage (roughly, before instrument-specific adjustments)
- Used margin = the total required margin across all your open positions
For example, at 30:1 leverage, a £30,000 position needs £1,000 of margin held aside. Open two similar positions and your used margin doubles, even though your account balance hasn't changed.
Margin requirements can vary between brokers, account types, and even change dynamically around high-impact news or low-liquidity periods. Always check the live margin requirement on the platform itself, or compare setups using the [cost audit tool](/audit.html), rather than relying on a fixed number you saw once.
Margin Level: The Number That Actually Protects You
Margin level is the health indicator of a leveraged account, calculated as:
Margin Level = (Equity ÷ Used Margin) × 100
- Equity = your account balance plus/minus floating profit or loss on open trades
- A margin level of 500% means you have five times your used margin in equity — comfortable
- A margin level approaching 100% means your equity has shrunk to match your used margin — no cushion left
Brokers use this figure to decide when to intervene:
| Margin Level | Typical Meaning | |---|---| | 300%+ | Healthy, plenty of free margin | | 100–150% | Margin call warning zone | | Below ~50% | Stop-out — broker starts closing positions automatically |
The exact stop-out percentage differs by broker and platform (MT4/MT5 defaults vs proprietary platforms), so confirm the specific thresholds on your broker's own risk disclosures before you rely on this cushion.
A Worked Example You Can Reuse
Say you deposit £2,000 and open a CFD position worth £20,000 (10:1 effective leverage on that trade).
1. Required margin for the trade: £20,000 ÷ 10 = £2,000 2. Free margin left: £2,000 equity − £2,000 used margin = £0 3. Margin level: (£2,000 ÷ £2,000) × 100 = 100%
You are already at the margin call threshold before the market has even moved, because you've used all your equity as margin for one trade. Any adverse move triggers a call or stop-out almost immediately.
Compare that with opening a £5,000 position from the same £2,000 deposit:
- Required margin: £500
- Free margin: £1,500
- Margin level: 400%
Same account, same leverage cap, wildly different risk — because position size, not the leverage limit, drove the outcome. This is the calculation worth running before every trade.
Free Margin, Used Margin and Why They're Not the Same
Traders often confuse the terms:
- Balance — your account value excluding open trades
- Equity — balance adjusted for floating P&L on open trades right now
- Used margin — total margin locked up by open positions
- Free margin — equity minus used margin; what's actually available to open new trades or absorb losses
Free margin is what determines whether you can open another position or survive a drawdown. Watching your balance alone tells you almost nothing once you have open trades — always check equity and free margin together.
Practical Steps to Manage Leverage and Margin
- Check your account's actual leverage per instrument in the platform before assuming a blanket ratio applies everywhere
- Calculate required margin before entry, not after — most platforms show this in the order ticket
- Keep margin level comfortably above 100% at all times; many experienced traders treat 300%+ as a working minimum
- Size positions to your account, not to the maximum leverage on offer — using less than the maximum available leverage is a legitimate risk control
- Factor in swap costs on leveraged positions held overnight, which compound alongside your margin exposure — see current figures on the [rates page](/rates.html)
- Compare leverage tiers and margin policies across brokers, since FCA-regulated firms like Pepperstone and IG apply their own instrument-specific limits and margin calls — check specifics on the [brokers directory](/brokers/index.html) rather than assuming they match
Conclusion: Treat Leverage and Margin as a Risk Tool, Not a Return Multiplier
Once you understand how leverage and margin work on a CFD account, the real lesson is that the leverage ratio itself is far less important than how much of your equity you commit to any single position. Margin is simply the deposit reserved against your exposure, and margin level is the early-warning gauge you should watch constantly, not just when things go wrong. Before trading live, run the numbers on a demo account, confirm your broker's specific margin call and stop-out rules, and use the [cost audit tool](/audit.html) or the [school section](/school/index.html) to build the habit of checking margin health before size, not after.
Key takeaways
- Leverage lets you control a larger position with a smaller deposit, but it multiplies both gains and losses on your actual stake
- Margin is not a fee — it's a portion of your account equity set aside by the broker as a good-faith deposit for the trade
- Margin level (equity ÷ used margin × 100) is the number to watch; most brokers issue a margin call around 100% and start closing positions near 50%
- Leverage ratios and margin requirements vary by instrument, account type and regulator, so always check current figures on your broker's platform, not old blog posts
- Higher leverage does not mean higher risk by itself — position size relative to your account is what actually determines your risk
- Use a demo account or small live size to see exactly how your broker calculates margin before trading full size
Frequently asked questions
- Is higher leverage always riskier?
- Not directly. Leverage sets how much margin a trade uses, but your actual risk comes from position size versus account equity. A small position at 30:1 leverage can be safer than a large position at 10:1. What matters is how many pips of adverse movement it takes to hurt your account, not the leverage number itself.
- What happens when my margin level hits 100%?
- Most brokers trigger a margin call warning around 100%, meaning your equity equals your used margin and you have no more free margin to absorb losses. If the market keeps moving against you, the platform will typically start automatically closing positions (a stop-out) once margin level falls further, often around 50%, though the exact threshold varies by broker.
- Does leverage cost money to use?
- Leverage itself isn't a direct cost, but margin trading and overnight positions usually involve swap or financing charges, plus the spread or commission on entry and exit. These costs compound over time on leveraged positions, so check current swap rates on our rates page before holding trades overnight.
- Why do leverage limits differ between brokers or countries?
- Leverage caps are largely set by regulators. FCA-regulated brokers serving UK retail clients, for example, follow rules that cap leverage on major FX pairs and lower it further for indices and shares. Professional or non-UK entities may offer different limits. Always confirm the leverage that applies to your specific account type on the broker's own pages.
- Can I change the leverage on my account?
- Many brokers let retail or eligible professional clients request a different leverage tier, and some let you set it per instrument. This won't change your risk automatically — you still need to size positions sensibly. Check your broker's platform settings or client portal, and compare options using our brokers directory.