Polymarket has exploded in popularity over the last couple of years. During the 2024 US election cycle, the platform processed over $3.5 billion in trading volume — numbers that rival small derivatives exchanges. Naturally, UK users are asking the obvious question: is Polymarket legal in the UK?
The short answer is: it’s not illegal. But the longer answer involves nuances around FCA regulation, HMRC tax treatment, and the practical risks of using an unregulated platform from Britain. Let me walk you through all of it.
What Is Polymarket?
Polymarket is a decentralised prediction market built on the Polygon blockchain. Unlike traditional bookmakers or spread-betting platforms, it doesn’t have a corporate entity taking the other side of your trade. Instead, you trade USDC (a US dollar stablecoin) against other users, buying YES or NO shares on binary outcome markets.
When the market resolves, winning shares pay out $1 USDC each, and losing shares go to zero. The price of a share at any point reflects the crowd’s probability estimate for that outcome. If you buy YES on “Will Labour win the next general election?” at 0.60 USDC, you’re effectively getting 1.67-to-1 on Labour winning.
It’s less like a bookmaker and more like a financial exchange for probabilities.
Is Polymarket Regulated by the FCA?
No. Polymarket is not regulated by the Financial Conduct Authority. It’s not authorised, registered, or supervised under any FCA regime.
This matters because the FCA is the main financial regulator for UK consumers. When you use an FCA-regulated broker or exchange, you benefit from:
- The Financial Services Compensation Scheme (FSCS), which covers up to £85,000 in the event of firm failure
- The Financial Ombudsman Service (FOS) for dispute resolution
- FCA conduct rules that require platforms to treat customers fairly
- Clear rules around client money segregation
With Polymarket, none of these apply. If the platform disappears, if your funds are stuck, or if there’s a dispute over how a market resolves — you have no regulatory recourse in the UK. The FCA has no jurisdiction over Polymarket’s smart contracts on Polygon.
That said, Polymarket being unregulated by the FCA doesn’t make using it illegal. The FCA doesn’t prohibit UK residents from accessing foreign or decentralised financial services — it simply doesn’t protect you when you do.
What About the FCA’s Crypto Asset Register?
The FCA maintains a register of crypto asset businesses that are compliant with UK anti-money laundering regulations. Polymarket is not on this register. This is worth noting if you’re conscious about compliance, but again — it’s not illegal to use unregistered crypto services as a consumer. The registration requirement applies to firms offering services in the UK, not to individuals using those services.
What Is the UK Gambling Commission’s Position?
Here’s where it gets interesting. The UK Gambling Commission (UKGC) licenses gambling operators in Great Britain. Prediction markets occupy a grey area — are they gambling or financial trading?
Polymarket has never applied for a UKGC licence. It doesn’t operate as a traditional bookmaker, and its decentralised, smart-contract-based structure makes it difficult to apply conventional gambling licensing frameworks.
The UKGC has historically focused on licensed operators. Using an unlicensed gambling site in the UK is not illegal for consumers — it’s the operator who would face enforcement. And because Polymarket doesn’t have a UK presence, this is largely academic.
More importantly, Polymarket doesn’t market itself as a gambling product. It positions itself as an information market. Whether any future UKGC guidance might attempt to classify prediction markets is an open question — but as of 2026, there’s no specific UKGC action or guidance targeting Polymarket or similar platforms.
Is It Actually Illegal to Use Polymarket in the UK?
No. There is no UK law that prohibits residents from accessing or using Polymarket.
The Gambling Act 2005 creates obligations for operators, not consumers. The Financial Services and Markets Act 2000 (FSMA) restricts firms from carrying on regulated activities without FCA authorisation — again, this targets firms, not individuals.
You are legally permitted to access Polymarket, deposit USDC, trade markets, and withdraw funds. The legal exposure is on the operator side, not yours.
What you don’t have is legal protection. That’s the critical distinction. It’s legal to do it; it’s just not safe in the way that using a regulated platform would be.
How Does HMRC Tax Polymarket Winnings?
This is the question that most UK users have once they’ve made some money. The HMRC treatment depends heavily on your circumstances, but here’s the framework:
Casual Users: Likely Tax-Free
If you use Polymarket occasionally — the way you might place a bet on a sporting event — HMRC will likely treat your winnings as gambling winnings. The UK does not tax gambling winnings for individuals. There’s no capital gains tax, no income tax, and no requirement to declare them on your self-assessment.
HMRC has long-standing guidance that betting and gambling winnings are not taxable, as they arise from chance rather than trade. For most casual Polymarket users, this is the most applicable treatment.
Frequent Traders: Potentially Trading Income
If you’re trading Polymarket markets systematically — large volumes, using models or data, running it like a business — HMRC may characterise your activity as a trade. In that case, profits would be subject to income tax at your marginal rate (20%, 40%, or 45%).
There’s no bright line between “casual gambling” and “trading.” HMRC looks at factors like frequency, organisation, the use of a system or strategy, and whether you’re making a living from it. If you’re treating Polymarket like a hedge fund, you should probably speak to a tax adviser.
The Crypto Complication
Here’s the wrinkle: your Polymarket activity involves USDC, a crypto asset. Even though USDC is a stablecoin pegged 1:1 to the US dollar, HMRC currently treats crypto assets as a type of property for capital gains purposes.
In practice, this means:
- Converting GBP to USDC on Coinbase is a disposal of fiat, not a taxable event
- Winning USDC on Polymarket (if treated as gambling) is tax-free
- Converting USDC back to GBP is technically a disposal of a crypto asset, and any gain/loss on the exchange rate could in theory be reportable
In reality, because USDC maintains its $1 peg, there’s minimal exchange-rate gain. But if HMRC ever gets stricter on crypto asset reporting, stablecoins could fall under scrutiny.
Bottom line: most casual UK users won’t owe tax on Polymarket winnings. But if you’re making serious money or trading professionally, talk to an accountant.
How Do UK Users Actually Access Polymarket?
Polymarket blocked US users after regulatory pressure in 2022 (they settled with the CFTC for $1.4 million). UK users are currently not geo-blocked — you can access the platform from a UK IP address without issues.
The practical steps to get started:
- Get a MetaMask wallet — Polymarket is non-custodial, meaning you control your own wallet. MetaMask is the standard browser extension for this.
- Buy USDC — You’ll need USDC on the Polygon network. The easiest way is to buy it on a UK-accessible exchange. Coinbase is the simplest option for UK users — you can fund it with GBP via bank transfer and buy USDC directly.
- Bridge or send to Polygon — Polymarket runs on Polygon (not Ethereum mainnet), so you’ll need to send or bridge USDC to the Polygon network.
- Connect your wallet to Polymarket — Go to polymarket.com, click “Connect Wallet,” and use MetaMask.
It takes about 15–20 minutes from a standing start. See our full step-by-step guide to using Polymarket in the UK for a detailed walkthrough.
Key Risks for UK Users
Even if it’s legal, there are real risks you should understand before depositing funds.
No FCA Protection
I’ve covered this above, but it’s worth repeating: if something goes wrong, you have no UK regulatory recourse. Smart contracts can have bugs. Oracles (the data sources used to resolve markets) can be manipulated or give wrong results. Markets can resolve in disputed or unexpected ways.
Polymarket does have a dispute resolution mechanism (using UMA protocol), but it’s decentralised and not backed by any regulatory framework.
Crypto Volatility (Even with Stablecoins)
USDC is generally stable, but not perfectly so. In March 2023, USDC briefly de-pegged to around $0.87 when Silicon Valley Bank (which held USDC reserves) collapsed. If you had funds on Polymarket during that weekend, you experienced a real, if temporary, loss on your holdings. This is unlikely to happen again, but it’s not zero risk.
Liquidity Varies Significantly
Major markets — US elections, crypto price predictions, major sporting events — can have millions of dollars in liquidity. But smaller or niche markets may have very thin order books. Getting a large position in or out of a low-liquidity market can result in significant slippage.
Wallet Security
Because Polymarket is non-custodial, your funds are only as secure as your wallet. Losing your seed phrase means losing everything. For any meaningful sum, I’d recommend storing your seed phrase securely offline and considering a hardware wallet. A Ledger hardware wallet is the standard solution — it keeps your private keys offline and protects against phishing attacks.
Privacy Considerations
All Polymarket activity is on-chain and publicly visible. But there’s a bigger reason UK users mention VPNs in the context of Polymarket: the platform is outright banned in the United States and several other countries, including North Korea and Cuba. US users are geo-blocked entirely.
For UK users, this isn’t a legal issue — you can access Polymarket freely. But if you travel to the US, or want to protect your privacy while trading, a VPN helps. NordVPN is the most widely used option in the crypto community — it has servers in 111 countries, a verified no-logs policy, and works reliably with crypto platforms. It’s worth having if you travel frequently or simply value keeping your browsing private.
The Bottom Line
Polymarket is legal to use in the UK. There is no law prohibiting British residents from accessing the platform, depositing funds, or trading markets. You will not be prosecuted for using it.
What you sacrifice is protection. No FCA oversight, no FSCS compensation, no ombudsman. You’re operating in a genuinely unregulated space, and the risks are real.
For most casual users — treating it as an interesting way to put money on your views about current events — the risks are manageable if you:
- Only use funds you’re genuinely prepared to lose
- Keep holdings small relative to your total finances
- Store your seed phrase securely
- Understand that market resolution disputes exist outside any UK regulatory framework
Read our full Polymarket review for UK users in 2026 for a more detailed look at how the platform works, the best markets, and whether it’s worth using.
Frequently Asked Questions
Is Polymarket banned in the UK?
No. Polymarket is not banned for UK users. There is no UK law that prohibits residents from accessing or using the platform. It is, however, unregulated — meaning you have no UK consumer protections.
Does the FCA regulate Polymarket?
No. Polymarket is a decentralised protocol and is not authorised or regulated by the Financial Conduct Authority. This means the FSCS and Financial Ombudsman Service do not apply to any funds you hold on the platform.
Do I have to pay tax on Polymarket winnings in the UK?
For most casual users, Polymarket winnings will be treated as gambling winnings by HMRC, which are tax-free in the UK. If you trade systematically at high volume, HMRC may classify your activity as trading income, which would be subject to income tax. If in doubt, speak to a UK accountant.
How do I fund my Polymarket account from the UK?
You’ll need USDC (a US dollar stablecoin) sent to a MetaMask wallet on the Polygon network. The simplest route is to buy USDC on Coinbase using GBP, then send it to your MetaMask wallet on Polygon.
Is Polymarket the same as a UK bookmaker?
No. Polymarket is a decentralised prediction market — you trade against other users, not against a bookmaker’s book. It uses smart contracts to handle settlements automatically. Unlike UK bookmakers, it is not licensed by the UK Gambling Commission and does not offer the consumer protections that come with licensed gambling.
Can Polymarket block UK users in the future?
Yes, it’s possible. Polymarket blocked US users in 2022 after regulatory pressure from the CFTC. If UK regulators took action against Polymarket, it’s feasible that geo-blocking could be extended to the UK. There are no current indications this is planned, but it’s a risk to be aware of.