Key takeaway: Prediction markets operate in a complex legal grey zone in the UK. Whilst spread betting and financial derivatives on major platforms are regulated by the FCA, most peer-to-peer prediction markets (including Polymarket) are not authorised to operate here. Tax treatment depends on whether HMRC classifies your activity as gambling, trading, or investment income—and that distinction is far from clear-cut.
The Legal Status of Prediction Markets in the UK
The question "Are prediction markets legal in the UK?" does not have a straightforward yes or no answer. The legality depends on the type of prediction market, the operator, and how the activity is structured.
In 2026, the UK regulatory landscape for prediction markets remains fragmented. The Financial Conduct Authority (FCA) regulates certain types of derivative betting and spread betting through licensed firms, but most decentralised or peer-to-peer prediction markets—particularly those based on blockchain or operated from overseas—fall outside formal FCA oversight. This does not necessarily mean they are illegal for UK residents to use, but it does mean they operate without regulatory protection.
The key distinction lies between:
- Regulated prediction markets: Platforms like Betfair Exchange and some spread-betting firms hold FCA authorisation to offer prediction-style products on financial and political outcomes. These are legal to use in the UK.
- Unregulated prediction markets: Platforms such as Polymarket, which operate from overseas jurisdictions and are not FCA-authorised, sit in legal limbo. They are not explicitly banned, but UK residents use them at their own risk and without regulatory protection.
- Gambling vs. financial derivatives: The Gambling Commission regulates traditional betting exchanges, whilst the FCA oversees financial derivatives. Prediction markets can blur this boundary, creating ambiguity about which regulator—if any—has jurisdiction.
As of 2026, there has been no major enforcement action against UK residents for using unregulated prediction markets, but the regulatory environment remains uncertain. The government has signalled interest in clarifying the rules, particularly around decentralised finance and blockchain-based platforms, but no definitive legislation has been enacted.
FCA Regulation and What It Means for You
The FCA's regulatory remit covers firms that offer financial derivatives, spread betting, and certain betting exchanges. If a prediction market is FCA-regulated, it must meet strict capital requirements, conduct regular audits, segregate customer funds, and provide clear risk warnings.
For example, Betfair—one of the largest betting exchanges in the UK—holds FCA authorisation for its financial spread-betting products. This means if Betfair became insolvent, customer funds would be protected under the Financial Services Compensation Scheme (FSCS) up to £85,000 per customer per firm.
Unregulated prediction markets offer no such protection. If Polymarket or a similar platform were hacked, suffered a software failure, or its operators disappeared, you would have no legal recourse and no compensation scheme to fall back on. This is a genuine financial risk that must be weighed against the potential returns.
The FCA has issued warnings about unregulated crypto-based prediction markets, advising consumers that they may be engaging in activities that breach financial promotion rules. However, the FCA's enforcement capacity is limited, and many platforms continue to operate and accept UK users.
Tax Treatment: How HMRC Classifies Prediction Market Activity
Tax liability on prediction market winnings is where things become genuinely complicated. HMRC's treatment depends on whether your activity is classified as gambling, trading, or investment income—and HMRC's guidance is not always clear.
Gambling vs. Trading: The Critical Distinction
If HMRC classifies your prediction market activity as gambling, winnings are typically tax-free in the UK. This is the general rule for betting, lotteries, and most forms of gambling. However, if HMRC deems your activity to be trading or investment, you will owe income tax on profits.
HMRC uses several factors to make this determination:
- Frequency and volume: Are you placing bets occasionally, or trading actively every day? High-frequency trading is more likely to be classified as a trade.
- Systematic approach: Do you use a documented strategy, track outcomes, and refine your approach? Professional-looking activity suggests trading rather than gambling.
- Profit motive: Are you explicitly trying to make a profit, or participating for entertainment? A clear profit motive leans toward trading.
- Time commitment: Do you spend significant hours researching and placing bets? This suggests a trade rather than a hobby.
- Financial scale: Are your stakes and potential returns substantial relative to your income? Larger sums suggest trading.
- Reliance on income: Is prediction market activity a significant part of your income, or a small side activity?
HMRC has published guidance on spread betting and betting exchanges, but prediction markets—especially decentralised ones—are not explicitly addressed. This creates genuine uncertainty.
Income Tax Implications
If HMRC determines that your prediction market activity constitutes a trade, profits are subject to income tax at your marginal rate (20%, 40%, or 45% depending on your income band). You would also potentially owe National Insurance contributions at 8% on profits above the secondary threshold.
You would be expected to declare this income on your Self Assessment tax return and keep detailed records of all bets, outcomes, and reasoning. Losses can be offset against profits, but only if the activity is classified as a trade.
Capital Gains Tax
In rare cases, if HMRC views prediction market activity as investment activity rather than gambling or trading, Capital Gains Tax (CGT) could apply. CGT is charged at 10% or 20% depending on your income level. However, this scenario is less common and would typically only apply if you were holding long-term positions in prediction market shares or tokens.
Practical Guidance for Staying Compliant
If you are a casual prediction market participant, HMRC is unlikely to investigate. However, if you are generating significant income or trading actively, you should:
- Keep detailed records of all transactions, including the date, amount staked, outcome, and profit or loss.
- Document your strategy and approach to demonstrate whether the activity is gambling or trading.
- Consider seeking advice from a tax professional familiar with betting and trading, as they can help you navigate HMRC's position.
- Declare income proactively on your Self Assessment return if you believe the activity may be classified as trading.
- Be prepared to justify your classification to HMRC if they enquire.
Important disclaimer: This article is not tax advice. HMRC's treatment of prediction market income is genuinely uncertain and evolving. If you are trading actively or generating significant income, you should consult a qualified accountant or tax adviser before proceeding. The consequences of misclassifying your activity—or failing to declare income—can include substantial penalties, interest, and potential prosecution for tax evasion.
Regulatory Risks and Consumer Protection Gaps
Using unregulated prediction markets carries several risks that regulated platforms do not.
Lack of Fund Segregation
Regulated platforms must segregate customer funds from operational funds, meaning your money is held separately and protected even if the company faces financial difficulties. Unregulated platforms have no such requirement. Your funds may be commingled with the operator's own money, leaving them vulnerable if the platform is hacked or the company collapses.
No Dispute Resolution Mechanism
If you have a dispute with a regulated platform—for example, if a bet is settled incorrectly—you can escalate the complaint to the Financial Ombudsman Service (FOS) or the Gambling Commission, depending on the platform's status. With unregulated platforms, you have no official recourse. You can only pursue the matter through private legal action, which is expensive and often impractical.
No Fraud Prevention Standards
Regulated platforms must implement anti-fraud and anti-money-laundering controls. Unregulated platforms may have weaker controls, increasing the risk that you could inadvertently become involved in money laundering or fraud.
Market Manipulation Risk
On smaller, less liquid prediction markets, there is a genuine risk of market manipulation. Large traders can move prices significantly, and there may be no mechanism to detect or prevent insider trading or other abusive practices.
Recent Regulatory Developments and Future Outlook
The UK regulatory environment for prediction markets is evolving. In 2026, several developments are worth noting:
Government Consultation on Crypto Assets
The government has been consulting on how to regulate crypto assets and decentralised finance. Prediction markets built on blockchain technology may eventually fall under new regulatory frameworks, but as of 2026, no final rules have been implemented.
FCA Warnings on Unregulated Platforms
The FCA has issued multiple warnings about unregulated prediction markets and crypto-based betting platforms. These warnings do not ban the platforms, but they signal regulatory concern and suggest that enforcement action may be forthcoming.
Potential Future Regulation
There is a possibility that the UK government could introduce specific legislation to regulate prediction markets, similar to how spread betting was brought under FCA oversight. However, this would likely take several years to implement, and the scope of any new rules remains uncertain.
International Regulatory Trends
Other jurisdictions, including the EU and the United States, are moving toward stricter regulation of prediction markets and decentralised finance. The UK may eventually follow suit, but the timing and scope of any changes remain unclear.
Practical Steps for UK Users
If you are considering using prediction markets in the UK, here are practical steps to manage legal and financial risk:
- Understand the operator: Research whether the platform is FCA-regulated, based overseas, or decentralised. Understand what protections (if any) are available.
- Use regulated platforms where possible: If you want maximum legal protection, stick to FCA-regulated platforms like Betfair or licensed spread-betting firms.
- Only use unregulated platforms with money you can afford to lose: Treat unregulated platforms as high-risk. Do not invest more than you can genuinely afford to lose.
- Keep records: Document all transactions, including dates, amounts, outcomes, and your reasoning. This will help if HMRC enquires, and it is essential for tax compliance.
- Assess your tax position: If you are trading actively or generating significant income, consult a tax professional to determine your tax obligations.
- Use secure passwords and two-factor authentication: Protect your account with strong security practices.
- Be cautious of promotional offers: Unregulated platforms may offer unrealistic returns or bonuses. Be sceptical and understand the terms.
Frequently Asked Questions
Is it illegal to use Polymarket in the UK?
Polymarket is not explicitly banned in the UK, but it is not FCA-regulated. Using it is technically permitted, but you do so without regulatory protection. HMRC may still tax your winnings depending on how your activity is classified.
Will I be prosecuted for using an unregulated prediction market?
It is highly unlikely that you will face criminal prosecution simply for using an unregulated prediction market as a casual user. However, if HMRC suspects you of tax evasion (by failing to declare trading income), you could face penalties and prosecution.
Are my funds protected on unregulated prediction markets?
No. Unregulated platforms do not have to segregate customer funds or participate in compensation schemes like the FSCS. If the platform is hacked or collapses, you may lose your entire balance with no recourse.
How does HMRC know if I am using prediction markets?
HMRC can request information from banks and payment processors. If you are transferring large sums to prediction market platforms, your bank may flag this, or HMRC may identify it during a tax investigation. Cryptocurrency-based platforms may be harder to trace, but this does not make non-disclosure legal.
Can I offset prediction market losses against other income?
Only if HMRC classifies your activity as trading. If it is classified as gambling, losses cannot be offset against other income. This is one reason why the gambling vs. trading distinction is so important.
What should I do if I have already used unregulated prediction markets?
If you have generated significant income and have not declared it, consider seeking advice from a tax professional. HMRC offers a voluntary disclosure opportunity, which can reduce penalties if you come forward before an investigation begins. If your activity was minimal or casual, the risk of investigation is low, but you should still keep records in case HMRC enquires.
Conclusion: Navigating Uncertainty
The legal and tax status of prediction markets in the UK remains genuinely uncertain. Whilst regulated platforms like Betfair offer legal clarity and consumer protection, unregulated platforms sit in a grey zone where legal risk and tax liability are both real but difficult to quantify.
The safest approach is to use regulated platforms and keep detailed records of all activity. If you choose to use unregulated platforms, do so with the understanding that you are accepting financial and legal risk, and that HMRC may eventually demand tax on your winnings.
As the regulatory environment evolves, it is likely that prediction markets will eventually be brought under clearer legal frameworks. In the meantime, staying informed and seeking professional advice—particularly on tax matters—is essential.
For more detailed guidance on prediction markets and how to compare platforms safely, visit Prediction Market UK.