Bottom line: Polymarket remains technically available to UK residents but sits within a regulatory ambiguity. British users can access it through crypto wallets without IP restrictions. Tax implications: earnings are probably liable to Income Tax (20–45%) or CGT (18–24%). PolyGram delivers a UK-adapted platform interface connected to the same Polymarket liquidity pool.
As a UK prediction market offering, Polymarket occupies a distinctive regulatory space. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly prohibited Polymarket. Because it functions through blockchain-based smart contracts and cryptocurrency wallets rather than conventional sterling accounts, it circumvents the regulatory structures that apply to established betting exchanges such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nevertheless, it remains unambiguously unlawful for UK residents. The principal regulatory considerations include:
- Absence of IP restrictions for UK-based users — contrasting with US-based participants who encounter access blocks
- Cryptocurrency-only settlement — Polymarket exclusively accepts USDC on Polygon, a digital asset rather than a regulated payment mechanism under the Gambling Act 2005
- FCA framework: Digital assets fall under the Financial Services and Markets Act 2023, though prediction market instruments receive no explicit regulatory classification
- UKGC guidance: No published statement addressing Polymarket specifically as of May 2026
Empirically: Since Polymarket's 2020 inception, UK participants have reported uninterrupted platform access, with no recorded regulatory action taken against individual UK traders.
Depositing into Polymarket from the UK
Deposit pathways accessible to UK residents via PolyGram:
- Kraken UK: Bank transfer via BACS or Faster Payments → acquire USDC → transfer to Polygon address (~10 minutes)
- Coinbase UK: Bank transfer or card payment → obtain USDC → move funds to Polygon
- PolyGram direct: Visa or Mastercard payment → USDC credited instantly to your PolyGram account
UK Tax Treatment of Polymarket Winnings
HMRC's approach to cryptocurrency-based prediction market returns operates as follows:
- If activity is infrequent (recreational): Returns may qualify as gambling proceeds — no tax liability under prevailing HMRC policy regarding spread betting and gambling receipts
- If activity is frequent/professional: HMRC may reclassify as commercial trading — subject to Income Tax (20–45%)
- Alternatively, if categorised as crypto holdings: Capital Gains Tax (18–24%) applies to USDC conversions exceeding the annual CGT exemption (£3,000 in 2026)
The tax position remains genuinely unclear. Numerous UK Polymarket participants report earnings using cryptocurrency CGT methodology and employ software 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 data, and party leadership contests
- Premier League: Championship winner, bottom-three finishers, and top-four finish markets throughout the campaign
- Champions League: Arsenal, Chelsea, Manchester City — each with substantial CL trading activity
- World Cup 2026: England tournament winner market trading at 13–15%
- Bank of England: Interest rate forecasts for 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 assessable profits. Whether Polymarket returns constitute taxable income hinges upon trading frequency and HMRC's determination of your status. Occasional participants may qualify for gambling exemptions; frequent traders typically incur Income Tax or CGT obligations. Seek guidance from a qualified UK tax specialist regarding your personal circumstances.
- Can I withdraw to a UK bank account?
- Direct withdrawal is unavailable. USDC requires conversion to GBP via a UK-authorised crypto platform (Kraken, Coinbase) before funds transfer to your bank. Standard Faster Payments processing typically requires 1–3 business days.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC oversight and provides FSCS safeguards. Polymarket operates via blockchain: assets reside within smart contracts rather than a centralised entity — eliminating single points of failure, yet providing neither FSCS nor UKGC recourse mechanisms if disagreements materialise.