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How Leverage and Margin Actually Work on a CFD Account

Updated 1 September 2026 · 8 min read · PipTax education

Understanding how leverage and margin work on a CFD account is the single most important risk-management lesson for any new trader, because it determines exactly how much of your own money is at stake on every position you open. Get the mechanics clear now, and margin calls, stop-outs and blown accounts stop being mysterious — they become predictable outcomes you can plan around.

What Leverage Actually Means

Leverage lets you control a larger market position than your account balance alone would allow. If your broker offers 30:1 leverage on a major FX pair, you can open a position worth £30,000 while only £1,000 of your own capital is committed as margin.

A few things worth being clear on:

• Leverage is a ratio, not free money. It doesn't improve your odds of winning a trade — it only changes how much capital is required to open it.
• Profits and losses are calculated on the full position size, not on your margin. A 1% move against a leveraged position can represent a much bigger percentage hit to your account equity.
• UK retail traders are capped by FCA rules — typically 30:1 on major currency pairs, with lower caps on indices, commodities, and much lower still on individual shares and crypto CFDs.
• Professional clients (those meeting FCA criteria on trading experience, portfolio size or industry background) can sometimes access higher leverage, but this also means giving up certain retail protections.

Leverage figures are set at the regulatory and broker level, and they can vary by instrument even within the same account. Always check the specific ratio applied to the market you're trading — don't assume it's uniform across FX, indices and shares.

Margin: The Collateral Behind the Leverage

Margin is the actual cash your broker sets aside from your balance to open and maintain a leveraged position. It's not a fee and it's not lost — it's reserved, and released back to you when the position closes (assuming no losses have eaten into it).

The core calculation is simple:

Margin required = Notional position size ÷ Leverage ratio

So a €50,000 EUR/USD position at 30:1 leverage requires roughly €1,666.67 in margin. Widen that to a £200,000 position on an index CFD at 20:1 leverage, and you'd need £10,000 set aside.

Margin requirements differ by:

• Asset class — FX majors typically have lower margin requirements than exotics, indices, or shares.
• Broker policy — some brokers apply tiered margin that increases on larger position sizes.
• Market conditions — margin requirements can rise sharply around high-impact news events or periods of elevated volatility.

Because these figures shift by broker and instrument, don't rely on rough memory when sizing a trade — check the live margin requirement in your platform, or run the numbers through PipTax's cost tool at /audit.html before you commit capital.

Used Margin, Free Margin and Margin Level

Once you have open positions, your account tracks three linked figures constantly:

| Term | What it means | |---|---| | Used margin | Total margin currently locked up across all open positions | | Free margin | Equity minus used margin — the capital still available to open new trades or absorb losses | | Margin level | (Equity ÷ Used margin) × 100 — expressed as a percentage, this is your real-time safety gauge |

As a losing trade moves against you, equity falls, which drags margin level down even though used margin stays the same. Watching margin level — not just your balance — is the habit that separates traders who react early from those who get forced out at the worst possible price.

Margin Calls and Stop-Outs Explained

These two terms get confused constantly, but they're distinct events:

• Margin call: an on-screen or account alert triggered when margin level falls to a broker-defined threshold (commonly somewhere between 100% and 150%, though this varies). It's a warning, not an automatic action.
• Stop-out: the point at which your broker's system automatically starts closing your open positions — usually starting with the largest loss — because margin level has fallen further, often to 50% or below depending on the broker.

What you can do before either happens:

1. Add funds to top up equity and restore margin level. 2. Close or reduce losing positions manually. 3. Hedge or adjust stops to limit further equity decline. 4. Never assume you'll have time to react once margin level is already critical — volatile markets can move through several percentage points in seconds.

Exact thresholds differ by broker and by regulatory jurisdiction, so check your provider's specific margin call and stop-out levels directly — they're usually published in the account terms or platform help section.

Practical Position Sizing With Leverage and Margin

A workable pre-trade routine:

• Decide your risk in cash terms first (e.g. "I'm willing to risk £50 on this trade"), not just in lot size.
• Calculate the position size that keeps your stop-loss distance consistent with that risk figure.
• Check the margin required for that position size against your available free margin — leave headroom, don't use it all.
• Factor in overnight swap costs if holding past the rollover, since these erode margin over time on leveraged positions (see /rates.html for typical swap behaviour).
• Stress-test mentally: if the market gapped 2% against you overnight, would your margin level survive, or would you be looking at a stop-out?

This is where comparing brokers matters. Pepperstone's MetaTrader margin settings and IG's own platform may present the same underlying FCA leverage cap differently in terms of tiered margin, stop-out percentages, or how professional accounts are handled. Neither is inherently "safer" — the mechanics just need checking broker by broker.

Comparing Real Margin Terms Across Brokers

Because leverage caps are regulatory but margin requirements, stop-out levels and tiered margin schedules are broker-specific, the only reliable way to know your real exposure is to check live terms rather than rely on marketing pages. Before opening or resizing a leveraged position:

• Compare actual margin requirements per instrument on PipTax's /audit.html cost tool.
• Review broker-by-broker leverage and account-type differences at /brokers/index.html.
• Read how PipTax sources and verifies these figures at /methodology.html.
• Build foundational knowledge on order types and risk tools at /school/index.html.

Conclusion

Once you understand how leverage and margin work on a CFD account — the ratio that sets your exposure, the collateral it locks up, and the margin-level gauge that tracks your safety buffer — the mechanics stop being a source of surprise losses and become a tool you actively manage. Trading CFDs is inherently risky and leverage magnifies both gains and losses, so always verify your broker's specific margin requirements and stop-out levels before sizing any position.

Keep going: Audit Methodology Index Index