CFDs — Contracts for Difference

What a CFD Actually Is

A Contract for Difference, universally abbreviated to CFD, is an agreement between you and a broker to exchange the difference in the price of an asset between the moment you open a position and the moment you close it. You never own the underlying share, index, currency pair, or commodity. You are not on a share register anywhere. There is no certificate, no dividend cheque in the traditional sense, no voting right at a company AGM. What you have instead is a purely financial contract whose value rises and falls in line with the real-world asset it references — a bet on direction, settled in cash, with nothing physical ever changing hands.

The mechanics, stripped to their simplest form, are these: if you open a CFD on a stock at £100 and close it when the price has risen to £115, the broker pays you the £15 difference, multiplied by the number of units you traded, minus whatever fees apply. If the price falls to £85 instead, you pay the broker the £15 difference. The same contract works identically whether you expect the price to rise (going "long") or fall (going "short") — a structural feature that makes CFDs unusually flexible compared to ordinary share dealing, where profiting from a falling price typically requires a separate, more cumbersome short-selling arrangement.

CFDs were developed in London in the early 1990s, originally as an institutional tool used by investment banks and hedge funds to gain exposure to UK shares without paying stamp duty (which applies to the purchase of UK shares themselves but not to a CFD referencing them) and without the operational burden of settling and holding physical stock. It was only in the late 1990s and 2000s that retail-focused CFD brokers brought the product to individual traders, marketing it heavily around its capital efficiency — the ability to gain large exposure with a comparatively small deposit. That capital efficiency is precisely leverage, and precisely the feature responsible for the product's reputation today.

Opening and Closing a CFD: The Mechanics in Detail

Every CFD trade involves four decisions: the direction (long or short), the size (how many units, often called "lots" or simply the position size), the entry price, and — critically, though often skipped by beginners — where you intend to exit if the trade goes wrong. Unlike buying a share, where the transaction is complete the moment you pay for it, a CFD position remains open and live, continuously marked to the current market price, until you explicitly close it or your broker closes it for you.

Now reverse the scenario. The same trade, but the share price falls from £40 to £36 instead of rising. The loss is £4 per unit across 500 units: £2,000 — effectively your entire margin deposit, wiped out by a 10% adverse move in the underlying share price. This single comparison is the entire CFD risk story in miniature: the same leverage that turned a 10% favourable move into a 98% gain turns a 10% adverse move into the complete loss of deposited capital.

Leverage — The Double-Edged Reality

CFDs are, by design, leveraged instruments. FCA-regulated brokers offering CFDs to retail clients in the UK operate within leverage caps introduced by regulators in 2018 and 2019: typically up to 30:1 on major currency pairs, 20:1 on major stock indices, 10:1 on commodities other than gold, 5:1 on individual equities, and 2:1 on cryptocurrencies. These caps exist specifically because regulatory research found a strong correlation between higher available leverage and higher rates of retail client losses — the caps were a direct, evidence-based policy response, not an arbitrary restriction.

That bottom row matters more than it might first appear. Without a regulatory safeguard, a sufficiently large adverse move on a leveraged position can, in principle, produce a loss larger than the amount originally deposited — the trader would owe the broker money beyond their account balance. FCA-regulated brokers are required to provide negative balance protection to retail clients specifically to prevent this outcome: your account balance is automatically floored at zero, and any loss beyond your deposited margin is absorbed by the broker rather than chased from you as a debt. This protection is a retail-specific safeguard — professional clients (a regulatory classification requiring certain income, asset, or trading-experience thresholds) do not automatically receive it, on the basis that they are assumed to understand and accept the full risk.

The Full Cost Picture: What a CFD Really Costs to Hold

The leverage conversation tends to dominate discussions of CFD risk, but the ongoing costs of actually holding a CFD position are just as important to understand, particularly for anyone tempted to treat a CFD as a longer-term investment rather than a short-to-medium-term trading tool.

• The spread. Every CFD trade is priced with a small gap between the buy price and the sell price — you effectively buy slightly above the true market price and sell slightly below it. This cost is paid on both entry and exit, and while it's often a fraction of a percent on liquid major instruments, it widens significantly on less liquid underlying assets, and it is paid on the full notional value of your leveraged position, not just your margin deposit.
• Overnight financing. Because a CFD position effectively represents a loan from the broker for the portion of the position beyond your own margin, holding a position open past the daily market close triggers a financing charge, typically calculated as a reference interest rate (such as SONIA in the UK) plus a broker markup, commonly in the range of 2–3 percentage points annually, applied daily. Short positions sometimes receive a credit rather than a charge, depending on the underlying instrument and prevailing interest rates, but the net effect for most long positions held for extended periods is a continuous, compounding drag on returns.
• Currency conversion charges. Trading a CFD on an asset denominated in a currency different from your account's base currency typically incurs a conversion fee, often around 0.5%, on both the position's profit and loss conversion and sometimes on the underlying exposure itself.
• Inactivity fees. Many CFD brokers charge a monthly fee on dormant accounts after a period of no trading activity, sometimes as little as one to three months — a detail easy to overlook when opening an account "just to try it out."

The Loss-Rate Disclosure You Should Actually Read

If you have ever glanced at a CFD broker's website or an advert, you've likely noticed a prominent risk warning stating that a majority of retail client accounts lose money trading CFDs with that specific provider — commonly phrased as something like "67% of retail investor accounts lose money when trading CFDs with this provider." This is not marketing copy, and it is not optional small print a broker includes out of caution. FCA rules require every firm offering CFDs to retail clients in the UK to prominently disclose the actual percentage of its own retail client accounts that lost money over the preceding twelve months, calculated according to a standardised methodology, and to display this figure in its advertising and on its website.

The specific percentage varies by broker and by period — it is genuinely broker-specific, recalculated regularly, and has historically clustered in a broad range roughly between the high-60s and high-70s percent across the industry, though any single figure you see should be treated as that broker's own reported, time-specific statistic rather than a fixed, universal number that applies to all providers at all times. The regulatory logic behind requiring this disclosure is straightforward: it gives a prospective client a concrete, broker-specific, independently verifiable data point about likely outcomes, before they fund an account, rather than relying solely on the broker's own marketing about potential profits.

CFDs vs Buying the Shares Outright

The stamp duty exemption and the absence of upfront full capital requirement were genuinely useful efficiencies for the institutional investors CFDs were originally designed for — a hedge fund wanting temporary, leveraged exposure to a basket of UK shares for a few weeks had little use for permanent ownership, voting rights, or dividend income, and the cost savings on stamp duty and capital efficiency were real and substantial at institutional scale. For a retail investor building long-term wealth, almost none of those original advantages apply in the same way, while the leverage risk and financing cost drag apply in full.

What You Can Actually Trade Through a CFD Account

Part of the appeal CFD brokers lead with is breadth: a single account can typically provide exposure to shares, stock indices, foreign exchange pairs, commodities, bonds, and cryptocurrencies, all traded with the same mechanics and often the same platform interface. This is genuinely different from, say, a standard share-dealing account, which is usually limited to shares and funds on the exchanges the platform supports.

Notice that the cap itself varies substantially by asset class, and this is not arbitrary — it broadly reflects each market's typical volatility. Major currency pairs tend to move in smaller daily percentage increments than individual shares or cryptocurrencies, so regulators permit higher leverage on them without the typical daily move being enough to routinely wipe out an account; conversely, an individual share, which can move 5–10% or more in a single session around news events, is capped far more conservatively. The breadth of available markets is a real convenience, but it also means a single account can hold several very differently-behaved leveraged exposures simultaneously, which is worth keeping in mind when assessing total account risk rather than evaluating each open position in isolation.

The Behavioural Patterns That Make CFD Trading Particularly Hard

Beyond the mechanical leverage and cost factors already covered, CFD trading has a well-documented set of behavioural traps that compound the structural risk, and recognising them by name is often the first step to resisting them.

Revenge trading. After a losing trade, the instinct to immediately open a new, often larger position to "win back" the loss quickly is extremely common and tends to produce worse outcomes, since it replaces a planned strategy with an emotionally driven reaction to a single bad outcome.

Overtrading from easy access. Because a CFD account allows opening and closing positions within seconds, across dozens of global markets, at any hour many of them trade, the sheer ease of placing another trade can itself become a source of excessive activity — each additional trade paying another spread, and compounding the cost drag described earlier.

Moving a stop-loss further away rather than accepting a loss. A losing position, left open and adjusted repeatedly to avoid crystallising the loss, tends to grow larger over time rather than smaller — the opposite of what a predetermined, respected stop-loss is designed to prevent.

Confusing a winning streak with skill. A run of profitable trades during a strong trending market can create unwarranted confidence that leads to progressively larger position sizes, right before market conditions change — a pattern visible across almost every retail trading boom and bust in CFD and similar leveraged products.

Why CFDs Are Banned for Retail Traders in the US

The Securities and Exchange Commission and the Commodity Futures Trading Commission do not permit CFD trading for US retail investors. The regulatory reasoning centres on the combination of high embedded leverage, the over-the-counter (broker-as-counterparty) structure rather than exchange trading, and the product's complexity relative to the sophistication typically expected of retail participants under US securities law. US retail traders wanting similar directional, leveraged exposure instead use exchange-traded futures (covered in a separate chapter) or options, both of which operate under a different, exchange-based regulatory framework with its own margin rules and investor protections.

In the UK and across the EU, CFDs remain legal for retail traders, but only within a substantially more restrictive framework than existed before 2018: leverage caps by asset class, mandatory negative balance protection, standardised risk warnings including the loss-rate disclosure, and restrictions on the kind of bonuses and incentives brokers can offer to attract new retail clients. This regulatory tightening followed detailed market research by the European Securities and Markets Authority and the UK's Financial Conduct Authority, which both found evidence of high retail losses correlating with high leverage, aggressive marketing, and product complexity — directly leading to the current rules.

Before these reforms, it was common for retail CFD brokers to offer leverage of 100:1, 200:1, or even higher on certain instruments — meaning a mere 0.5–1% adverse move could wipe out an entire deposit. Regulators also found that some brokers' marketing and bonus structures (deposit-matching bonuses, aggressive trading incentives) were encouraging retail clients to deposit and trade more than they otherwise would have, without a corresponding improvement in their understanding of the risks involved. The reforms introduced in 2018 and 2019 directly targeted both the leverage levels and the marketing practices, not just one or the other, on the view that leverage caps alone would not meaningfully change outcomes if clients were still being encouraged to maximise their exposure within the new, lower caps.

Who Actually Uses CFDs, and Why

Professional and institutional traders use CFDs much as they always have: for short-term, leveraged, tax- and settlement-efficient exposure to an asset without the operational overhead of taking physical delivery or settlement of shares, bonds, or commodities. A proprietary trading desk expressing a short-term view on a sector rotation, for example, may use index or sector CFDs specifically because the position will likely be closed within days or weeks, making overnight financing costs and the absence of dividends largely irrelevant to the trade's economics.

Retail speculative traders are the primary audience CFD brokers market to today, drawn by the ability to go long or short with a comparatively small deposit across a huge range of global markets from a single account — forex pairs, major indices, individual shares, commodities, and increasingly cryptocurrencies, all tradeable through the same interface. This flexibility is real, but it comes bundled with the leverage, cost, and loss-rate realities covered throughout this chapter.

Hedgers with a specific short-term exposure also use CFDs — an investor holding a large concentrated position in a single share ahead of an uncertain event (an earnings release, a referendum, a regulatory decision) might open a short CFD on that same share as a temporary hedge, intending to close both positions once the uncertainty has passed, rather than selling the underlying holding outright and potentially triggering an unwanted tax event.

How a CFD Margin Call Actually Plays Out

Understanding the margin call process in detail matters because it is the mechanism through which leveraged losses actually crystallise, and it moves faster than most new traders expect. Brokers typically define two thresholds below the initial margin: a warning level, at which the broker notifies you that your account equity is approaching the minimum required, and a stop-out level, at which the broker will automatically begin closing positions without further confirmation from you, specifically to prevent the account falling into a negative balance.

Take the earlier £2,000 margin, £20,000 notional long CFD position as an example. If the broker's stop-out level is set at 50% of required margin, the position would be automatically closed once losses reduced account equity to roughly £1,000 — corresponding to the underlying share price falling by around 5%, half the distance to the full loss of margin described earlier. This is a deliberate safety mechanism, not a punitive one: it exists to stop losses before they reach the point of exceeding your deposit, protecting both you and the broker. But it also means that a volatile intraday swing — a brief, sharp dip followed by a recovery within the same session — can trigger a forced closure and crystallise a loss that would not have existed had the position simply been left alone until the price recovered.

Choosing a CFD Broker: What Actually Matters

Because CFDs are over-the-counter products quoted directly by the broker rather than traded on a public exchange, the broker itself is your counterparty on every trade — a materially different relationship than buying shares through a platform that simply executes your order on a public exchange on your behalf. This makes broker due diligence more important for CFD trading than for many other forms of investing.

• FCA authorisation. Confirm any UK-facing broker is listed on the FCA's Financial Services Register, searchable directly on the FCA's own website, and that the specific entity you are opening an account with (not just a similarly-named affiliate) holds the relevant permissions.
• Client money segregation. FCA rules require regulated brokers to keep client funds in segregated accounts, separate from the firm's own operating capital, so that client money is protected if the broker itself becomes insolvent.
• FSCS protection. UK-regulated investment firms are typically covered by the Financial Services Compensation Scheme up to a set limit per person, per firm, in the event of the firm's failure — though this protects against firm insolvency, not against ordinary trading losses, which the FSCS does not cover.
• Transparent cost disclosure. A reputable broker publishes its spreads, overnight financing rates, and any additional fees clearly, rather than requiring you to discover them only after opening an account and a position.
• The mandatory loss-rate figure itself. As covered above, this single disclosed statistic is one of the most directly useful, broker-specific pieces of information available to you before committing any capital.

Common Mistakes Retail CFD Traders Make

Sizing the position against total account balance rather than against a defined risk amount. A common and costly error is treating the full margin deposit as the amount "at risk" on a single trade, rather than deciding in advance what percentage of the account can be lost on any one position before opening it. Professional risk management typically limits any single position's maximum loss to a small percentage of total trading capital — often 1–2% — a discipline frequently absent from retail accounts opened without a clear plan.

Trading without a predetermined stop-loss. Because CFD losses can accelerate quickly under leverage, deciding your exit point for a losing trade only after it starts losing money tends to produce worse outcomes than deciding it in advance, when judgment isn't being distorted by an open, moving loss.

Holding leveraged positions far longer than originally intended. A trade opened as a short-term, few-days view that is still open three months later has usually stopped being a deliberate strategy and started being a reluctance to realise a loss — and the overnight financing charges accruing throughout make this an expensive form of procrastination.

Underestimating the effect of the spread on frequent trading. A trader opening and closing many positions a day pays the spread on every single one, and across enough trades this cost compounds into a significant drag that is easy to underweight when focused purely on whether individual trades are "right" or "wrong" on direction.

Ignoring correlation across multiple open positions. Holding several CFDs that are all, in effect, leveraged bets on the same underlying economic theme (several technology shares, several commodity-linked instruments) creates concentrated risk that looks like diversification on a position list but behaves like a single large leveraged bet when the market moves.

CFDs vs Spread Betting: The UK-Specific Alternative

In the UK specifically, CFDs have a close cousin: spread betting, which is mechanically very similar — both are leveraged, both reference an underlying price, both involve overnight financing on held positions, both allow going long or short. The single most important difference is tax treatment. Under current UK rules, spread betting is classified as gambling rather than investing, meaning profits are free of both Capital Gains Tax and Income Tax. CFD profits, by contrast, are subject to Capital Gains Tax in the same way as other investment gains.

The trade-off is symmetrical: because spread betting profits are tax-free, spread betting losses cannot be offset against other capital gains for tax purposes, whereas CFD losses generally can be used to reduce a CGT bill elsewhere. Frequent traders sometimes gravitate toward spread betting specifically for the tax treatment on a strategy they expect to be profitable overall; investors who might reasonably expect to post losses in some years alongside gains in others may find the loss-offset feature of CFDs more valuable. Both products remain subject to the same FCA leverage caps and loss-rate disclosure requirements described earlier in this chapter, since both are regulated as high-risk retail derivatives.