CFD Leverage and Margin
CFD leverage lets you control a market position larger than the margin committed to it. Margin is the amount your broker requires to support that position. The distinction matters because gains and losses depend on the full exposure, not just the deposit. As ASIC’s Moneysmart guidance explains, losses can quickly exceed the margin used to open a trade.
Within CFD trading, the practical question is therefore not simply “Can I afford the margin?” It is “What would an adverse price move do to my account?”
For US readers: retail CFDs are not available to US residents, as stated in FOREX.com’s CFD disclosures. The examples below explain the mechanics in jurisdictions where retail CFD trading is permitted.
The Difference Between CFD Leverage and Margin
Leverage expresses exposure as a multiple of the capital required to support it. At 20:1, £500 of initial margin supports a £10,000 position. The margin rate is 5% because £500 represents 5% of £10,000. IG’s explanation of margin and leverage describes this inverse relationship: a lower margin percentage corresponds to a higher exposure multiple.
For a position subject to one percentage rate:
Initial margin = notional position value × margin rate
Leverage multiple = notional position value ÷ initial margin
“Notional value” means the full market exposure represented by the contract.
| Leverage ratio | Margin rate | Initial margin |
|---|---|---|
| 20:1 | 5% | £500 |
| 10:1 | 10% | £1,000 |
| 5:1 | 20% | £2,000 |
| 2:1 | 50% | £5,000 |
These are mathematical comparisons, not a promise that every ratio is available on every market.
Initial margin is the opening requirement. Maintenance margin concerns the equity needed to keep positions open. Providers use different account labels and warning thresholds, so check their definitions rather than assuming every platform works identically. IG’s margin schedule, for example, separates initial requirements from ongoing account funding.
How to Calculate CFD Margin and Profit or Loss
Calculate exposure before calculating margin. For a share CFD representing one share per unit, multiply units by the share price. For an index contract, include its monetary value per point. These contract differences appear in IG’s margin trading product disclosure statement.
The following examples are hypothetical and exclude spreads, commissions, financing, currency conversion and other adjustments.
Share CFD Example
Suppose you buy 200 CFD units at £50, with each unit representing one share. The broker requires 20% margin.
Exposure: 200 × £50 = £10,000
Initial margin: £10,000 × 20% = £2,000
If the closing price is £52, the £2 movement produces a £400 profit. If it is £48, the same position produces a £400 loss.
The share price moved 4%, but the result equals 20% of the £2,000 margin. If the account initially contained £5,000, that £400 result would instead equal 8% of starting account equity. Return on margin and return on account capital are different measurements.
Index CFD Example
Suppose an index stands at 8,000 and one CFD contract is worth £2 per index point. Its exposure is £16,000. At a 5% margin rate, the opening requirement is £800.
An 80 point move against the position creates a £160 loss. That is a 1% index movement, a loss equal to 20% of the initial margin, and a reminder to check the contract multiplier before placing the order.
Balance, Equity, Used Margin and Free Margin
Your account balance alone does not show whether open positions remain adequately funded. For a straightforward cash funded account, distinguish between:
- Balance
- The recorded cash balance after deposits, withdrawals, realized trading results and booked charges.
- Equity
- The balance adjusted for unrealized gains and losses, with other adjustments depending on the platform.
- Used margin
- The amount allocated to support open positions under the broker’s margin rules.
- Free margin
- Equity remaining after used margin is deducted.
IG’s account margin guide explains free margin and the common margin level calculation:
Free margin = equity − used margin
Margin level = equity ÷ used margin × 100%
Suppose your balance is £5,000, used margin is £1,000 and open positions show a £600 loss. Assuming no other adjustments, equity is £4,400, free margin is £3,400 and margin level is 440%.
The £1,000 margin allocation is not an extra £1,000 trading loss. Margin acts as collateral rather than a fee, as FXCM’s margin documentation explains. Releasing that allocation when a position closes does not reverse losses incurred on the trade.
In the example, another £400 trading loss would reduce equity to £4,000. If used margin stayed unchanged, free margin would fall to £3,000. The account balance could still display £5,000 until the loss was realized.
Available Leverage Versus Actual Account Exposure
A broker offering 20:1 does not require you to use that much exposure relative to your account. Effective leverage compares the value of open positions with account equity, rather than with the minimum deposit for those positions.
Effective leverage = total notional exposure ÷ account equity
Consider one £20,000 position in an account with £5,000 equity. Effective leverage is 4:1. If the instrument requires 5% margin, the broker allocates £1,000, leaving £4,000 free before costs and price movements.
A 1% adverse movement would lose £200, or 4% of starting equity. If the broker instead required 10% margin, the allocation would rise to £2,000, but that same price move would still lose £200. Changing the deposit requirement does not change the cash result of an unchanged position.
Now increase the position to £80,000. At 5% margin, it requires £4,000. A 1% adverse move loses £800, or 16% of starting equity. The broker’s margin rate is identical; the account risk is not.
These comparisons show why available buying power should not become a spending target. Position size determines how much money each price movement adds or removes.
Why CFD Margin Requirements Differ
Market and Regulatory Rules
Under the FCA’s UK retail margin rules, minimum opening margin includes 3.33% for major currency pairs, 5% for major stock indices and gold, 10% for commodities other than gold and minor stock indices, and 20% for individual shares. These broadly correspond to maximum ratios of 30:1, 20:1, 10:1 and 5:1.
Australia also applies asset based retail caps ranging from 30:1 to 2:1. ASIC extended its CFD product intervention order through May 23, 2027. Do not assume rules from one jurisdiction apply to an account opened elsewhere.
Client classification matters too. The FCA has warned about firms encouraging customers to surrender retail protections through professional classification or redirection to overseas entities. A larger permitted position is not necessarily an improvement in account terms.
Broker Rates, Position Tiers and Changes
A regulatory minimum is not a guaranteed broker rate. Providers can require more margin. Under IG’s tiered margin system, larger exposures can attract higher percentage requirements than smaller trades in the same market.
Imagine a hypothetical schedule charging 5% on the first £20,000 of exposure and 10% on the next £10,000. A £30,000 position would require £2,000: £1,000 for each portion. Applying the lowest advertised percentage to the whole position would underestimate margin by £500.
Requirements may also change while a trade remains open. IG’s disclosure terms describe both floating margin calculations and changes during volatile conditions. If a £20,000 position’s rate rose from 5% to 10%, another £1,000 would become allocated to margin, even with no price movement.
Margin Calls, Forced Closure and Negative Balance Protection
A margin call concerns an account funding shortfall; a stop-out is the broker closing positions. Do not assume a warning guarantees time to transfer money. IG’s disclosure terms allow position closure without prior notification in circumstances covered by its agreement.
For UK retail accounts, the FCA’s close-out rule requires positions to be closed as soon as market conditions allow when account net equity falls below 50% of the applicable margin requirement. This is an account level threshold, not a promise that each trade can lose only half its opening deposit.
Execution procedures deserve separate attention; see CFD margin calls and stop-outs for the detailed mechanics.
Negative balance protection addresses a different problem: liability beyond the account’s funds. The FCA’s retail CFD protections prevent losses exceeding the funds in the trading account. They do not protect the opening margin or prevent the account from being depleted.
Trading Costs Still Apply to the Full Position
Posting a smaller deposit does not make a position proportionally cheaper to hold. For example, CMC Markets calculates relevant CFD holding costs using units, the applicable market price and the holding rate, rather than just the margin allocation.
Suppose a hypothetical £20,000 cash CFD position incurs an 8% annual charge calculated on its full value using a 365 day year. The daily amount would be about £4.38. That calculation does not shrink because the opening margin was only £1,000.
Actual rates, calculation methods, credits and charges depend on the instrument and provider. Review CFD trading costs separately from the funding requirement, particularly overnight financing if a position may remain open across several sessions.
Size the Trade Before Checking Whether Margin Fits
A practical planning approach is to start with a tolerable cash loss and the distance to a planned exit, then calculate the position and its margin requirement. This keeps the broker’s maximum exposure from becoming the default trade size.
Suppose a hypothetical plan allows £100 of price risk on a share CFD entered at £50, with an intended exit at £48. Assuming one share per unit, the £2 distance permits 50 units before allowing for costs or execution differences.
The position represents £2,500 of exposure. At 20% margin, it requires £500. The planned price loss is £100, the margin is £500, and the exposure is £2,500. Those three figures answer three different questions.
That £100 is not a guaranteed maximum. Ordinary stops can execute at a worse price during rapid movements; IG distinguishes this slippage risk from guaranteed stops, which carry a premium. Review the conditions in CFD stop-loss orders and guaranteed stops before treating an exit level as fixed.
Use CFD position sizing to establish exposure, then check the margin requirement, remaining free equity and potential loss across existing trades. If the position fits only by consuming nearly all available funding, reduce it or leave it alone. Passing a broker’s margin check is not the same as passing your own risk check.