Smarkets looks less like a bookmaker than a trading terminal. Two columns of prices, back on one side, lay on the other, a ladder of decimals, a running total of matched volume at the bottom. No cartoon horses, no accumulator prompts nagging you to bet the treble. It is the same shape as a Level 2 equities screen, just cheaper and pointed at outcomes rather than shares.
That visual choice tells you most of what you need to know about the platform. Smarkets is a peer-to-peer exchange, licensed in the UK, that lets users trade the outcome of political, sporting, and cultural events against each other rather than against a house. For readers based in Britain who want exposure to event outcomes without the regulatory grey zone of offshore prediction markets, it is one of a very small number of options that is unambiguously legal, tax-friendly, and actually usable.
Who Smarkets is actually for
The target user is not a punter chasing an ITV racing tip. Smarkets was founded in London in 2008 by a former investment banker, and the platform reflects that heritage. The reader who gets the most out of it is someone who thinks in probabilities, wants to see the full depth of an order book, and cares about paying two pence in the pound rather than ten.
If you have ever opened Polymarket, felt the pull of a US election contract, and then remembered you cannot legally use it from a UK address, Smarkets is the closest thing to a home-turf substitute. It will not carry the same US-centric political depth. But it will carry UK general elections, Prime Minister markets, party leadership contests, and a rotating menu of cultural events with real liquidity behind them.
Worth flagging upfront: it is a gambling exchange under UK law, not a financial instrument. That has consequences for tax, which we come back to.
The exchange mechanic in plain English
Here is where the shape of the product diverges from a traditional bookmaker. On a fixed-odds site, you bet against the operator. They set the price, they take the position, they profit when you lose. On Smarkets, you bet against another user. The platform is a matching engine, nothing more.
Every market has two sides. Backing an outcome means you win if it happens. Laying it means you win if it does not, and you take on the liability of paying out the backer if it does. So if you lay Labour to win the next general election at decimal odds of 1.50, you are effectively selling that outcome to someone else at an implied probability of 66.7%. Our explainer on how prediction market odds work unpacks the probability translation in more detail.
The upshot is that prices reflect what other traders think, weighted by how much they are willing to stake. No margin baked in by a risk manager in a back office. The only take is Smarkets's commission.
The 2% question
Commission is the single number that matters most, and Smarkets has spent a decade making it a marketing hook. The standard rate is 2% of net winnings on a market. Betfair Exchange, the incumbent, starts at 5% and scales up depending on which markets you trade and how much premium charge you have accrued as a winning user.
On paper that is a two-and-a-half times cost advantage. In practice it is more nuanced, because Betfair usually carries deeper liquidity on the biggest markets, and a slightly worse price on a full-size trade can eat the commission saving. But if you are pricing a market where both venues are roughly matched, Smarkets wins on cost every time. For a fuller breakdown, our Smarkets vs Polymarket comparison walks through where each platform actually delivers.
The other charge to know about is inactivity. Leave the account dormant long enough and Smarkets will start taking a monthly fee from any residual balance. Standard exchange practice, but worth noting if you plan to fund the account and forget about it.
What you can actually trade
Sports dominate the volume. Football, tennis, golf, horse racing, US sports where the timezones cooperate. That is the bread and butter, and it is what keeps the lights on.
But the interesting territory, for readers of a prediction-markets platform, is politics and current affairs. Smarkets runs UK general election winner markets, seat-count ladders, Prime Minister exit-date contracts, party leadership races, and periodic one-off markets on referendums, treaty ratifications, and the like. During the 2024 general election cycle, some of these carried genuinely useful volume. Between elections, liquidity thins out considerably. That is the trade-off with any political market: the flow arrives when the story does.
US political markets exist on Smarkets too, but they are a shadow of what trades on Kalshi or Polymarket. A UK-licensed venue simply does not attract the same weight of US-based traders. If you want tight prices on the 2028 Republican nominee, this is not where you find them. If you want a decent UK PM exit contract at 2% commission, it is.
Sign-up and the KYC bit
Opening an account takes about ten minutes if your documents are to hand. Smarkets is a UK Gambling Commission licensee, which means it is bound by the same identity checks as any regulated operator: photo ID, proof of address, occasionally source of funds if your deposits get chunky. Passport or driving licence for ID, a recent utility bill or bank statement for address, uploaded through the browser.
Once verified, funding is straightforward. Debit card deposits clear more or less instantly. Bank transfers take a day. Withdrawals go back to the same method you funded from, standard anti-money-laundering discipline. No crypto rails, no USDC bridges, no offshore custody puzzles. This is one of the meaningful advantages over Polymarket for UK users; the guide on legal alternatives to Polymarket covers the broader picture.
Where the platform genuinely wins
The interface. Smarkets's own trading terminal, plus a stripped-down retail app called SBK for users who want a bookmaker-style experience, are cleaner than the Betfair equivalents. Ladder-style order entry, one-click hedging, in-play cash-out that actually works.
Commission, as covered. And a general absence of the darker patterns that afflict retail gambling. No welcome offer chasing you into a treble, no VIP host emailing to ask why you have not funded recently. The company has been public about pitching itself as the sober alternative in the sector, and the product mostly delivers on that.
The UK tax treatment is the third quiet advantage. Gambling winnings are not subject to UK income tax or capital gains tax for individuals, because the underlying activity is classed as gambling rather than trading. Our prediction markets tax guide goes through the mechanics, and worth reading before you assume anything, because the position for offshore or crypto-settled markets is different.
Where it does not
Liquidity outside the marquee markets is thin. A UK general election in full swing will have a proper book; a midweek League One relegation market will not. If you want to trade in size on obscure contracts, Betfair usually has the depth Smarkets does not.
The political market coverage, while good by UK standards, is narrow compared to what Polymarket carries on the crypto side or Kalshi on the CFTC-regulated side. There is no Smarkets equivalent of Polymarket's sprawling menu of AI, geopolitics, and cultural contracts. If your interest is prediction markets as a broad epistemic tool, you will still find yourself looking wistfully across the Atlantic.
And the retail app, SBK, sits in an awkward middle ground. Simpler than the exchange, but still not as glossy as the big-brand sportsbooks that dominate UK TV advertising. Users who came looking for a bookmaker sometimes find it fiddly. Users who came looking for a trading terminal go straight to the exchange interface and ignore SBK entirely.
The strategic point
What Smarkets really represents is the UK's answer to the question of what a regulated event-trading venue looks like. It sits inside a Gambling Commission framework rather than a financial regulator's, which shapes what it can offer and how it is taxed. It cannot list every contract Polymarket lists, because the licensing perimeter will not allow it. But everything it does list is legal to trade from a UK address, funded through a UK bank, with winnings that do not need to appear on a self-assessment return.
For a certain kind of user, that combination is worth more than a longer market menu. Slower, narrower, cleaner. A get-rich-slowly play, if you get rich at all, which most people trading events do not.
iPredicta covers the UK exchange landscape alongside the offshore and US-regulated venues, and Smarkets is on the platform's watch list precisely because it is one of the few options where a UK reader can act on the odds analysis without a compliance headache. The site's role is to surface what is moving and where, so readers can pick the venue that fits their situation.
Frequently asked questions
Is Smarkets legal in the UK?
Yes, Smarkets holds a UK Gambling Commission licence and operates as a regulated exchange from London. That means it is subject to the same consumer-protection, KYC, and anti-money-laundering rules as any licensed UK operator. Users must verify their identity and address before funding an account, and deposits go through standard UK banking rails rather than crypto. For UK residents this is a meaningful contrast with offshore prediction markets like Polymarket, which are geo-blocked and not authorised to serve UK users. Our guide to whether prediction markets are legal in the UK walks through the wider regulatory picture in more detail.
How much does Smarkets charge in commission?
Smarkets charges a standard 2% commission on net winnings from each market, which is one of the lowest rates in the licensed UK exchange sector. Betfair Exchange, the main incumbent, starts commission at 5% and can scale higher depending on market type and how much a user has won historically. There is also an inactivity fee on dormant accounts, so long-term funded balances that go untouched will slowly erode. No commission is charged on losing positions. The 2% figure applies to the market as a whole, not per-trade, which matters if you are hedging in and out of a position multiple times before settlement.
Are winnings on Smarkets taxable in the UK?
For UK-resident individuals, winnings from Smarkets are not subject to income tax or capital gains tax, because the underlying activity is treated as gambling under UK law. This applies whether the winnings come from a football match, a general election market, or a cultural event contract. Professional or trader-status arguments are exceedingly rare and would need specific HMRC engagement. The position is materially different for offshore or crypto-settled prediction markets, where tax treatment can be more complex. Our prediction markets tax guide covers the distinction between UK gambling treatment and the trickier tax questions around USDC-settled contracts abroad.
How does Smarkets compare to Betfair Exchange?
Smarkets is cheaper, cleaner, and smaller; Betfair is more expensive, older, and deeper. The 2% commission on Smarkets versus Betfair's 5%-plus is the headline gap, but Betfair usually carries more liquidity on the biggest markets, especially horse racing and Premier League football. On UK political markets the two exchanges are often more evenly matched, and the cost advantage on Smarkets starts to matter. The interfaces differ too: Smarkets's terminal is more modern and closer to a trading screen, whereas Betfair's has more features but a busier look. Casual users often prefer Smarkets's simplicity; heavy-volume users sometimes stick with Betfair for depth.
Can I trade US political markets on Smarkets?
Yes, Smarkets lists some US political markets, but liquidity is a fraction of what trades on Kalshi or Polymarket. As a UK-licensed exchange, Smarkets attracts primarily British users, so US contracts sit outside the platform's centre of gravity. Prices on a 2028 presidential nominee market will typically be wider and thinner than on a US-focused venue. For UK users who want deeper US political exposure, the honest answer is that no UK-licensed venue matches Kalshi or Polymarket for that specific use case, and the offshore options come with their own regulatory constraints. Our guide to Polymarket access from the UK covers the trade-offs.