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 piece of maths a new trader needs, because it decides how much you can lose, not just how much you can win. Get it wrong and a modest market move can wipe out an account far faster than the price chart suggests it should.
What Leverage Actually Does
Leverage lets you open a position much larger than your deposit. If your broker offers 30:1 leverage on a major forex pair, £1,000 of margin can control a £30,000 notional position. That's the whole mechanism — leverage multiplies your exposure, not your account balance.
The upside is obvious: a small move in your favour produces a proportionally bigger return on your deposit than if you'd bought the underlying asset outright. The downside is the same multiplier working against you:
- A 1% adverse move on a 30:1 leveraged position isn't a 1% loss — it's roughly a 30% hit to your margin
- Leverage doesn't change the probability of a winning trade; it only changes the size of the outcome
- Higher leverage means your account can move from healthy to margin-called in a much smaller price range
Retail leverage caps exist precisely because of this asymmetry. In the UK, the FCA limits leverage on major currency pairs to 30:1 for retail clients, with lower caps on indices, shares and crypto-related CFDs. Professional accounts can access higher leverage, but with fewer regulatory protections. Check current caps and how they apply per instrument on /rates.html before assuming a ratio.
Margin: The Deposit Behind the Leverage
Margin is simply the cash your broker sets aside from your account to open and hold a leveraged position. It's calculated from the leverage ratio and the trade's notional value:
Margin required = Notional position size ÷ Leverage ratio
So a £30,000 notional forex position at 30:1 leverage needs £1,000 margin. If the leverage cap on that instrument were lower — say 10:1 for certain indices — the same £30,000 position would need £3,000 margin instead.
Two margin figures matter once you have positions open:
- Used margin — the total currently locked up across all open trades
- Free margin — what's left in your account to open new positions or absorb losses
Brokers differ on how they calculate margin for hedged positions, guaranteed stops, or exotic instruments, so always check the specifics on the platform itself — Pepperstone and IG both publish margin schedules that vary by asset class, and pulling the actual figures from /brokers/index.html or running a scenario through /audit.html beats guessing.
Margin Level: The Number That Actually Matters
Your account balance can look healthy while your margin level is quietly heading towards trouble. Margin level is the figure brokers actually monitor:
Margin Level = (Equity ÷ Used Margin) × 100
- Equity is your balance plus or minus any floating profit/loss on open trades
- As losses grow, equity falls, and margin level drops even though your original deposit hasn't moved
Most brokers set two thresholds:
1. Margin call level (e.g. 100%) — you can't open new trades, and you'll get a warning 2. Stop-out level (e.g. 50%) — the broker starts automatically closing positions, usually the most unprofitable first
These thresholds vary by broker and account type, so don't assume Pepperstone's stop-out level matches IG's — check the live figures for the account you're actually funding.
A Worked Example
Say you open one standard lot (100,000 units) of a major pair with £1,000 margin at 30:1 leverage — your notional exposure is £100,000... actually let's keep this proportional and realistic:
| Item | Value | |---|---| | Notional position size | £30,000 | | Leverage | 30:1 | | Margin required | £1,000 | | Account equity | £2,000 | | Margin level | 200% |
If the trade moves against you and equity falls to £1,000, margin level drops to 100% — a margin call. If it keeps falling to £500 equity, margin level hits 50%, triggering a stop-out on many platforms. This is why sizing positions relative to account equity — not just relative to available margin — is the actual risk control.
Leverage, Margin and Overnight Costs
Leverage doesn't just affect risk on the trade itself — it also affects what you pay to hold it overnight. Swap (financing) charges are calculated on the full notional exposure, not on your margin deposit. So two traders with identical £1,000 accounts but different leverage settings, holding the same instrument, could pay very different overnight financing if their position sizes differ as a result.
This matters most for:
- Swing and position traders holding CFDs for days or weeks
- Anyone using higher leverage to "free up" margin for additional positions while keeping notional size the same
- Comparing true cost of carry across brokers — a job better done with real numbers than assumptions
Run any multi-day scenario through /audit.html so financing costs are part of the sizing decision, not an afterthought.
Practical Rules for Managing Leverage and Margin
A few habits keep leverage working for you rather than against you:
- Don't use maximum available leverage by default. Just because 30:1 is offered doesn't mean every trade should be sized to use it fully
- Size positions off account equity, not free margin. Free margin tells you what you *can* open; equity-based sizing tells you what you *should*
- Know your broker's exact margin call and stop-out levels before you need them — not during a fast market
- Recalculate margin requirements when volatility spikes. Some brokers raise margin requirements around major news events or holidays
- Treat swap costs as part of position sizing, especially on leveraged carries held longer than a day or two
Understanding how leverage and margin work on a CFD account isn't a one-off lesson — it's a check you should run every time you resize a position or switch instruments. For structured lessons on position sizing and risk, browse /school/index.html, and for live, comparable numbers rather than rules of thumb, use PipTax's cost tool before you next click "buy."
Key takeaways
- Leverage lets you control a large notional position with a small deposit, but it scales losses exactly as it scales gains — it doesn't create free money
- Margin is the deposit your broker holds against your open position, worked out from the leverage ratio and the trade's notional value
- Margin level (equity ÷ used margin × 100) is the number that actually triggers margin calls and stop-outs, not your account balance
- Leverage limits differ by regulator and instrument — FCA rules cap retail forex at 30:1, far below what offshore accounts sometimes offer
- Overnight financing (swap) is charged on the full notional exposure, not just your margin, so higher leverage means bigger financing costs on carried positions
- Always check a broker's actual margin requirements and stop-out levels on their live platform or via PipTax's cost tool before sizing a trade
Frequently asked questions
- What's the difference between leverage and margin?
- Leverage is the ratio (e.g. 30:1) that determines how much notional exposure you can control per pound of deposit. Margin is the actual cash amount your broker sets aside from your account to open and hold that position. Leverage is the rule; margin is the pound-and-pence result of applying it.
- What happens when I get a margin call?
- A margin call is a warning that your margin level has dropped towards a broker-set threshold, usually because open positions are losing money. Most brokers will first restrict new trades, then automatically start closing positions (a stop-out) if equity keeps falling, often before your account reaches zero — but you can still lose more than you expect in fast-moving markets.
- Why is my margin requirement different at Pepperstone vs IG?
- Margin requirements depend on each broker's regulatory tier, the instrument, and sometimes your trading history. Pepperstone and IG are both FCA-regulated but may apply different tiered margin rates or asset-specific leverage caps. Always check the live margin schedule on each platform or run the numbers through PipTax's cost tool rather than assuming they match.
- Does higher leverage mean higher trading costs?
- Leverage itself isn't a direct cost, but it changes your notional exposure, and several real costs scale with notional size — including overnight swap charges and, indirectly, the pip value of your spread. Bigger leverage means a bigger position for the same deposit, so the same spread in pips costs more in pounds.
- Can I trade CFDs with no leverage at all?
- Most CFD brokers require some margin, so a small amount of leverage is usually built into the product structure. However, you can effectively reduce your leverage by depositing far more than the minimum margin required and only opening small positions relative to your account size — this is a core risk-management technique.