For a generation of UK tech workers paid partly in equity, the stock market is no longer an abstraction. Share schemes, IPO chatter and a steady run of fintech listings have pulled more people into investing, and many quickly discover that buying a share is only one way to take a view on a company or a market. Spread betting sits alongside it as a popular alternative, yet the two work in fundamentally different ways, and those differences shape everything from tax bills to how much can be lost in a bad week.
Ownership Versus Exposure
The core distinction is simple. Buy a share through a dealing account and you own a slice of the business. You are entitled to dividends, you can vote at the annual general meeting, and you can hold the position for decades without paying to keep it open, beyond any platform fees.
With spread betting, nothing changes hands. You stake an amount per point of price movement on whether a market will rise or fall, and your profit or loss reflects how far it moves in the direction you chose. Because you never own the underlying asset, you have no shareholder rights. What you gain is flexibility: going short is as simple as going long, and a single account can cover indices, currencies, commodities and metals.
That flexibility matters in a sector as volatile as technology. A shareholder who expects a correction in US chip stocks has few options beyond selling. A spread bettor can take a position on the index falling.
Leverage Changes the Maths
Share dealing is usually unleveraged. Put £5,000 into a company and the most you can lose is £5,000.
Spread bets are margined products, so a modest deposit controls a much larger position. The Financial Conduct Authority made its restrictions on these products permanent in 2019, capping retail leverage at between 30:1 and 2:1 depending on the asset. Major currency pairs sit at the top of that range, major indices such as the FTSE 100 and Nasdaq 100 at 20:1, and individual shares at 5:1. Providers must also close positions once funds fall to half the required margin, and retail clients cannot lose more than the money in their account.
The DeepSeek sell-off in late January 2025 shows why those guardrails exist. Nvidia’s shares dropped roughly 17% in a single session, wiping around $589bn off its value, the largest one-day loss of market value in US stock market history at the time. The Nasdaq 100 fell close to 3%. An unleveraged shareholder took a painful but survivable hit. A trader holding a fully leveraged index position at 20:1 would have seen that smaller index move consume more than half of their margin in a day.
Leverage magnifies gains in exactly the same way, but it demands disciplined position sizing and stop-loss orders.
Costs also build up differently. Share dealing usually involves a commission or platform fee plus the bid-offer spread, after which holding is cheap. Spread betting costs are mostly built into the spread, but positions held overnight incur financing charges, which makes long holding periods expensive.
Where the Tax Treatment Diverges
For UK residents, tax is often the deciding factor. Profits from selling shares outside an ISA or pension are subject to Capital Gains Tax once they exceed the £3,000 annual exempt amount, charged at 18% for basic-rate taxpayers and 24% above that. Purchases of UK shares also typically attract 0.5% Stamp Duty Reserve Tax.
HMRC views spread betting differently. Because no asset is bought or sold, its guidance states that no chargeable gains or allowable losses arise, so profits are generally free of both CGT and stamp duty. The flip side is that losses cannot be offset against other gains, and the treatment could differ for someone whose activity amounts to a trade or main source of income.
The ISA muddies the comparison. The stocks and shares ISA allowance remains £20,000 a year, and a long-term investor with room left in that allowance may gain no tax advantage from switching at all.
A Shifting Picture for UK Tech Listings
Stamp duty has long been a sore point for London’s equity market, and the government has started to chip away at it. The November 2025 Budget introduced a three-year exemption from the 0.5% SDRT charge on trading in companies newly listed on a UK regulated market. For anyone buying into a fresh UK tech flotation, that narrows one of the cost gaps between owning shares and trading derivatives.
Venue still matters. Arm chose Nasdaq over London for its 2023 flotation, and Wise moved its primary listing to New York in May 2026 while keeping a secondary line in London. For British investors, backing homegrown tech champions increasingly means navigating US markets, currency conversion and different trading hours.
Final Thoughts: Costs, Time Horizons and Choosing Between Them
That points to the clearest dividing line. Owning shares suits investors building positions over years, collecting dividends and backing businesses they believe in. Spread betting tends to suit shorter-term traders who want to react to market moves, go short or trade several asset classes from one account, and who are comfortable managing leveraged risk.
Plenty of experienced market participants run both, with a long-term portfolio inside an ISA and a smaller, actively managed trading account alongside it. Neither is inherently better. They are tools built for different jobs.