CFD Trading vs Spread Betting: Tax, Costs, and Which One Suits You

UK traders using leveraged derivatives face a concrete choice that most broker comparison pages gloss over. Spread betting and CFDs are both OTC products offering leveraged exposure without ownership of the underlying asset, but they behave differently on tax, cost, and holding period in ways that genuinely affect your bottom line. Here are worked numbers for both, a clear tax breakdown, and a practical framework for deciding which to use, or when to run both at once.

How Both Instruments Work: Side-by-Side on the Same Trade

Spread betting sizes positions in pounds per point. CFDs use contracts or lots with a notional value. Both are leveraged, both are OTC, and neither attracts stamp duty, unlike buying shares directly where 0.5% stamp duty reserve tax applies.

Take a concrete example. You want exposure to Barclays shares, currently priced at 220p (220 GBP per 100 shares, or 2.20 per share). You want roughly £2,200 of notional exposure.

Spread bet: You bet £10 per point. Each point is 1p of share price movement. Notional exposure = £10 x 220 points = £2,200. If Barclays rises to 235p, gain = (235 minus 220) x £10 = 15 x £10 = £150 profit. If it falls to 205p, loss = (220 minus 205) x £10 = 15 x £10 = £150 loss.

CFD: You buy 1,000 CFD contracts at 220p per share = notional value of 1,000 x £2.20 = £2,200. Same move to 235p: gain = (235p minus 220p) x 1,000 = 15p x 1,000 = £150 profit. Same fall to 205p: loss = £150. Identical P&L profile. The difference emerges in tax and cost, not in how the trade moves.

Costs, Overnight Financing, and Holding Period

Both instruments typically charge via the spread rather than commission, though some CFD brokers offer tighter spreads plus a separate commission. Overnight financing applies to both. For a long position, the rate is usually calculated as: notional value x (benchmark rate + broker margin) / 365. On a £2,200 position with a total rate of 6% per annum, the daily charge = £2,200 x 0.06 / 365 = approximately £0.36 per night. That compounds. Hold for 90 nights and you have paid around £32 in financing alone, before any spread cost.

The critical structural difference is expiry. Spread bets have a fixed quarterly expiry, typically March, June, September, December. If you want to hold past expiry, you roll the position, closing at the current price and reopening the next contract. Rolling incurs the spread again each time. CFDs are open-ended rolling contracts with no fixed expiry, but the overnight financing never stops. For short-term trades under a few weeks, the distinction barely matters. For positions held months, CFD rolling cost is predictable and continuous, while spread bet rolling cost hits you discretely at each quarterly roll. Neither is inherently cheaper. It depends on the broker’s roll spread versus their overnight rate.

UK Tax Treatment: Where the Real Difference Lies

This is where the products genuinely diverge. Spread betting profits are tax-free for UK residents under HMRC rules. No Capital Gains Tax, no income tax on winnings. CFD profits are subject to Capital Gains Tax. For the 2024/25 tax year, the CGT annual exemption is £3,000. Gains above that are taxed at 18% or 24% depending on your total income band.

However, CFD losses can be offset against other CGT gains. If you hold a physical share portfolio and have realised gains elsewhere in the tax year, a losing CFD position can be declared as a capital loss to reduce your overall CGT bill. A spread bet loss cannot be used this way, because there is no taxable event to begin with. If you are sitting on a profitable share portfolio and expect short-term volatility, opening a short CFD rather than a spread bet gives you a potential tax-loss instrument if the position goes against you.

Neither product works inside an ISA. And if you are not UK-resident, the spread betting tax advantage does not automatically follow you. Tax treatment in your country of residence applies instead.

Which Instrument Suits Your Situation

FCA leverage caps apply to both equally: 30:1 on major forex pairs, 20:1 on indices, 10:1 on commodities, 5:1 on individual shares, 2:1 on crypto. Retail clients on both instruments benefit from negative balance protection. Guaranteed stop-loss orders (GSLOs) are available on some brokers for both products, but they carry a premium, typically a wider spread or a small fixed charge. They are worth the cost when holding over a news event where gapping risk is material.

If you hold physical UK shares, a short CFD or spread bet on the same stock can act as a partial hedge. The spread bet is simpler for a straightforward hedge with no tax paperwork. The CFD hedge generates a recordable loss if it pays off, which may be useful depending on your CGT position for the year.

Running both simultaneously is a legitimate strategy. Use spread bets for short-term speculative trades where you want profits to be tax-free. Use CFDs for positions you specifically want to generate harvestable tax losses against gains elsewhere in your portfolio. Different tools, different jobs.

A quick suitability summary:

• Short-term speculator: Spread bet. Tax-free gains, no CGT admin, simple sizing.
• Long-term holder: CFD for the open-ended structure, but factor in overnight financing compounding over months.
• Tax-conscious investor with a share portfolio: Use CFDs strategically for loss harvesting, spread bets for speculation.

The Decision Comes Down to Two Variables

Your tax position and your holding period determine which instrument fits. If you are a UK resident with no other CGT exposure and trade short-term, spread betting is almost always the cleaner choice. If you have gains to offset or need an open-ended structure, CFDs earn their place. Neither is universally superior. Brokers that push you toward one product without asking about your tax situation are answering the wrong question. Make the choice based on your circumstances, not their product preference.