Bottom line: Polymarket remains accessible to UK residents but exists within an uncertain regulatory environment. British traders can participate via cryptocurrency wallets without geographic restrictions. Regarding taxation: profits are likely subject to either Income Tax (20–45%) or Capital Gains Tax (18–24%). PolyGram delivers a UK-tailored platform interface connected to the same Polymarket liquidity pool.
Operating as a prediction market service, Polymarket finds itself in a distinctive regulatory landscape within the United Kingdom. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly prohibited Polymarket. Given its reliance on blockchain technology and cryptocurrency wallets rather than conventional sterling payment systems, it circumvents the statutory regimes that oversee licensed betting operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks formal UKGC authorisation. Conversely, it is not subject to an outright prohibition affecting UK residents. The principal regulatory considerations are as follows:
- Absence of geographic blocking for UK-based internet connections — contrasting sharply with the restrictions imposed on American users
- Cryptocurrency-only settlement — Polymarket exclusively accepts USDC on Polygon, a digital asset rather than a conventional payment instrument regulated under the Gambling Act 2005
- FCA framework: Digital assets fall under the Financial Services and Markets Act 2023, though prediction market instruments remain unspecified within that regime
- UKGC guidance: No formal statement addressing Polymarket's status as of May 2026
Practically speaking: UK-based traders have maintained continuous platform access since Polymarket's 2020 inception, with no recorded instances of regulatory action taken against individual UK participants.
Depositing into Polymarket from the UK
Accessible funding methods for UK participants via PolyGram:
- Kraken UK: BACS or Faster Payments transfer → acquire USDC → transfer to Polygon wallet (approximately 10 minutes)
- Coinbase UK: Bank transfer or debit card purchase → USDC acquisition → Polygon network transfer
- PolyGram direct: Visa or Mastercard debit card → USDC is immediately credited to your PolyGram account
UK Tax Treatment of Polymarket Winnings
HMRC's approach to crypto-based prediction market profits follows these guidelines:
- Where activity is infrequent (non-professional): Profits may qualify as gambling returns — exempt from tax under existing HMRC treatment of betting and spread-bet gains
- Where activity is frequent/professional: HMRC may deem this a commercial enterprise — liable to Income Tax (20–45%)
- Alternatively, if characterised as a crypto holding: Capital Gains Tax (18–24%) applies when USDC is sold, provided gains exceed the annual CGT exemption (£3,000 for 2026)
The precise tax classification remains uncertain. Numerous UK Polymarket participants treat their returns as cryptocurrency gains and employ platforms such as Koinly or CoinTracker to produce tax documentation acceptable to HMRC.
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 data, and potential party leadership transitions
- Premier League: Championship contention, bottom-three finishes, and top-four qualification throughout the campaign
- Champions League: Arsenal, Chelsea, Manchester City — each with substantial European competition markets
- World Cup 2026: England's tournament victory probability currently trading between 13–15%
- Bank of England: Interest rate forecasting markets aligned with 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 income subject to taxation. Whether Polymarket returns constitute taxable income depends on your trading pattern and how HMRC categorises your activity. Occasional participants may benefit from the gambling exemption; those trading regularly will almost certainly face either Income Tax or CGT obligations. Seek guidance from a qualified UK tax professional regarding your circumstances.
- Can I withdraw to a UK bank account?
- Direct bank transfers are not available. USDC must first be exchanged for GBP through a UK-authorised cryptocurrency exchange (such as Kraken or Coinbase) before funds can be withdrawn to your account. The withdrawal process typically requires 1–3 business days via the Faster Payments scheme.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC oversight and provides FSCS safeguards. Polymarket functions as a decentralised protocol: assets reside within smart contracts rather than a centralised entity — eliminating single-point-of-failure risks but forfeiting FSCS or UKGC recourse mechanisms in the event of technical or contractual disputes.