In this guide
Bottom line: Polymarket remains technically accessible to UK residents but exists within an uncertain regulatory landscape. British traders can access the platform through crypto wallets without geographic restrictions. Tax implications: gains are likely subject to either Income Tax (20–45%) or CGT (18–24%). PolyGram delivers a UK-tailored experience built on the same Polymarket order book.
Within the UK prediction market ecosystem, Polymarket occupies a distinctive regulatory space. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly prohibited Polymarket. Because the platform functions through blockchain wallets and decentralised smart contracts rather than conventional GBP payment channels, it circumvents the regulatory structures applied to established operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nonetheless, it remains unambiguously unlawful for UK residents. The principal regulatory considerations include:
- Absence of geographic restrictions on UK traffic — contrasting sharply with American users who face blocking
- Crypto-only settlement — Polymarket accepts exclusively USDC on Polygon, a digital asset rather than a regulated payment instrument under the Gambling Act 2005
- FCA framework: Digital assets fall under the Financial Services and Markets Act 2023, though prediction market instruments remain unspecified
- UKGC guidance: No formal statement regarding Polymarket has been issued as of May 2026
Practically speaking: British traders have experienced uninterrupted service since Polymarket's 2020 inception, with no recorded prosecutions targeting individual UK participants.
Depositing into Polymarket from the UK
Deposit pathways accessible to British users through PolyGram:
- Kraken UK: BACS or Faster Payments → acquire USDC → transfer to Polygon wallet (approximately 10 minutes)
- Coinbase UK: Bank transfer or debit card → USDC → move to Polygon
- PolyGram direct: Visa or Mastercard → USDC credited instantly to your PolyGram wallet
UK Tax Treatment of Polymarket Winnings
HMRC's approach to crypto-based prediction market returns operates as follows:
- When activity is infrequent (personal interest): Proceeds may qualify as gambling returns — exempt from tax under prevailing HMRC guidance for spread betting and gaming wins
- When activity is frequent/professional: HMRC may reclassify as business income — liable to Income Tax (20–45%)
- Alternatively, when classified as crypto holdings: Capital Gains Tax (18–24%) applies to USDC conversions exceeding the yearly CGT threshold (£3,000 for 2026)
Tax characterisation remains genuinely uncertain. Numerous British Polymarket participants report earnings under crypto CGT frameworks and utilise platforms such as Koinly or CoinTracker to produce HMRC-acceptable documentation.
UK-Relevant Markets on Polymarket
- UK General Election: Following the 2024 election, the subsequent general election is scheduled for 2029. Active markets exist for by-elections, polling trends, and party leadership contests
- Premier League: Championship winner, bottom-three, and top-four finisher markets throughout the campaign
- Champions League: Arsenal, Chelsea, Manchester City — all with substantial trading activity
- World Cup 2026: England tournament odds currently trading between 13–15%
- Bank of England: Interest rate forecasting markets covering each Monetary Policy Committee decision
Polymarket vs UK Alternatives
| Platform | UK Access | Regulated | House Edge | Markets |
|---|---|---|---|---|
| Polymarket (via PolyGram) | ✅ Full | Grey zone | ~1% | 8,400+ |
| Betfair Exchange | ✅ Full | UKGC | 5% | ~500 |
| Smarkets | ✅ Full | UKGC | 2% | ~200 |
| Kalshi | ❌ US only | CFTC (US) | ~1% | ~500 |
| Metaculus | ✅ Full | None | N/A (no money) | 5,000+ |
Access UK prediction markets via PolyGram →
FAQ — Polymarket UK
- Do I need to declare Polymarket winnings to HMRC?
- HMRC mandates disclosure of all taxable returns. Polymarket returns' tax status hinges on activity volume and HMRC's ultimate determination. Occasional participants may benefit from the gambling exemption; frequent traders face probable Income Tax or CGT obligations. Seek personalised guidance from a qualified UK tax professional.
- Can I withdraw to a UK bank account?
- Direct bank transfer is unavailable. USDC requires conversion to GBP through a UK-authorised crypto exchange (Kraken, Coinbase) before bank withdrawal. Standard Faster Payments processing typically requires 1–3 working days.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC licensing and incorporates FSCS safeguards. Polymarket functions as a decentralised system: assets reside in smart contracts rather than a centralised operator — eliminating single points of failure but forfeiting FSCS or UKGC recourse mechanisms if problems materialise.