How Leverage and Margin Actually Work on a CFD Account
Understanding how leverage and margin work on a CFD account is the single most important risk lesson in trading — get it wrong and a small price move can wipe out a chunk of your capital far faster than you'd expect. This guide breaks down the mechanics in plain terms so you can size positions with your eyes open.
What Leverage Actually Means
Leverage is a ratio, usually written as something like 30:1 or 500:1, that tells you how much market exposure you can control for every pound of your own capital. If your broker offers 30:1 leverage on a major FX pair, £1,000 of your money can control £30,000 of notional exposure.
That's the entire concept. Leverage doesn't create free money — it just changes how much of your own capital sits behind a given position size. The profit or loss you make is always calculated on the full notional exposure, not on your deposit. So:
- Higher leverage = smaller deposit needed for the same position size = bigger swings relative to your account balance
- Lower leverage = larger deposit needed = smaller swings relative to your account balance
Leverage ratios are set by regulators, brokers and sometimes the specific instrument. UK retail clients trading with FCA-regulated brokers face capped leverage — 30:1 on major currency pairs, lower on indices, commodities, shares and crypto-related products. Professional clients can sometimes access higher ratios, but that usually means giving up certain protections.
Margin: The Cash Behind the Position
Margin is the actual money your broker sets aside from your account balance to open and maintain a leveraged position. It's a mechanical calculation:
Margin required = Notional exposure ÷ Leverage ratio
So if you're trading one standard lot of EUR/USD (notional value roughly $100,000 depending on the exchange rate) at 30:1 leverage, your margin requirement is around $3,333. That's the amount locked up as "used margin" — it's not lost, but you can't use it for anything else while the position is open.
Brokers usually show this as a margin requirement percentage rather than a ratio — a 30:1 leverage cap equals a 3.33% margin requirement. Different instruments carry different margin percentages even within the same account, so:
- Major FX pairs might sit at 3.33% margin
- Minor pairs and indices often sit higher, around 5%
- Commodities and single shares can require 10–20%+ margin
Always check the specific instrument's margin tier on your broker's platform — Pepperstone and IG both publish tiered margin schedules that vary by asset class, and they're not identical to each other.
Margin Level: What Actually Triggers a Margin Call
This is the part traders often misunderstand. It's not your leverage ratio that triggers a margin call — it's your margin level, which changes constantly as your floating profit or loss moves.
Margin level = (Account equity ÷ Used margin) × 100
- Equity is your balance plus or minus any open floating P&L
- Used margin is the total margin locked up across all open positions
When a losing trade eats into your equity, your margin level falls. Brokers set two key thresholds:
1. Margin call level (often around 100%) — a warning that you're getting close to trouble 2. Stop-out level (often 50%, sometimes lower) — the point where the broker starts force-closing positions automatically, usually the most losing one first
These thresholds vary by broker and even by account type, so check the exact figures in your terms rather than assuming a standard number.
A Worked Example
Say you have £2,000 in your account and open a position requiring £500 margin. Here's how margin level moves as the trade goes against you:
| Scenario | Equity | Used Margin | Margin Level | |---|---|---|---| | Trade opened | £2,000 | £500 | 400% | | Floating loss of £500 | £1,500 | £500 | 300% | | Floating loss of £1,000 | £1,000 | £500 | 200% | | Floating loss of £1,500 | £500 | £500 | 100% (margin call zone) | | Floating loss of £1,750 | £250 | £500 | 50% (possible stop-out) |
Notice the leverage ratio never appears in this table directly — it only matters at the moment you open the trade, to set how much margin gets locked up. From then on, margin level and equity are what decide your fate.
Why Leverage Choice Still Matters for Costs
Leverage itself typically doesn't carry a direct cost — you're not charged interest on the "borrowed" exposure the way you might assume. But it changes the relationship between your account size and the cash impact of ordinary trading costs:
- Spread and commission are charged per lot traded, regardless of leverage — but a highly leveraged small account trades bigger lot sizes relative to its capital, so the cash drag from spread is proportionally larger
- Overnight swap/financing charges scale with position size too, so leveraged positions held overnight cost more in absolute terms per pound of capital
- Slippage on stop-outs during fast markets can be worse when margin levels are already thin
This is exactly why PipTax's cost tool asks for your position size and holding period — it's the combination of leverage-driven position size and the underlying spread/swap rates that determines your real cost, not leverage alone.
Practical Steps Before You Trade Leveraged CFDs
Before opening a leveraged position, run through this checklist:
1. Check the margin requirement for the specific instrument on your broker's platform — don't assume it matches the FX major rate 2. Calculate your margin level after the trade, not just before it 3. Decide your risk in cash terms first, then work backwards to position size — don't just take the maximum leverage on offer 4. Confirm negative balance protection is active on your account type 5. Compare margin schedules across brokers using /brokers/index.html — Pepperstone and IG list theirs clearly, but tiers differ by asset 6. Run your numbers through /audit.html to see combined margin, spread and swap impact before going live
Conclusion
Once you understand how leverage and margin work on a CFD account, position sizing stops being guesswork. Leverage sets how much margin a trade locks up; margin level — driven by your floating equity — is what actually determines whether you get a margin call. Treat the leverage ratio as a sizing tool, not a target to max out, and always check live margin schedules and cost impact through PipTax's tools rather than assuming figures from memory. Trading CFDs with leverage carries a high risk of rapid loss, so size positions with that firmly in mind.
Key takeaways
- <parameter name="item">Leverage lets you control a large notional position with a small deposit (margin)
- but it scales both profits and losses equally