Bottom line: Polymarket remains accessible to UK residents but exists within an uncertain regulatory framework. British traders can participate via cryptocurrency wallets without IP-based restrictions. Taxation of returns depends on activity classification: casual participants may benefit from gambling exemptions, whilst active traders face Income Tax (20–45%) or Capital Gains Tax (18–24%). PolyGram delivers a UK-focused trading interface connected to the same Polymarket liquidity pool.
Within the landscape of UK prediction markets, Polymarket occupies a distinctive regulatory space. The Gambling Commission has neither granted formal authorisation nor issued explicit prohibitions against Polymarket. Because the platform functions through decentralised cryptocurrency wallets and blockchain-based settlement rather than conventional GBP accounts, it falls outside the traditional regulatory perimeter that applies to established operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks formal UKGC authorisation. Nevertheless, it remains unambiguously unlawful for UK-based participants. The principal regulatory considerations include:
- Absence of geographic restrictions on UK traffic — in contrast to American users who encounter blocking measures
- Cryptocurrency settlement only — Polymarket exclusively accepts USDC on Polygon, a digital asset rather than a regulated payment instrument under the Gambling Act 2005
- FCA framework: Crypto holdings fall within the remit of the Financial Services and Markets Act 2023, though prediction market instruments receive no specific treatment
- UKGC guidance: The regulator has issued no formal position statement regarding Polymarket as of May 2026
Empirically: Since Polymarket's 2020 inception, UK participants have maintained uninterrupted platform access with no reported regulatory enforcement against individual traders.
Depositing into Polymarket from the UK
Practical pathways for UK-based funding via PolyGram:
- Kraken UK: Bank transfer via BACS or Faster Payments → acquire USDC → transfer to Polygon-compatible wallet (approximately 10 minutes)
- Coinbase UK: Card payment or bank transfer → obtain USDC → send to Polygon network
- PolyGram direct: Visa or Mastercard debit card → USDC credited instantly to your PolyGram account
UK Tax Treatment of Polymarket Winnings
HMRC's approach to crypto-based prediction market returns:
- For infrequent participants (non-professional activity): Returns may qualify as gambling proceeds — exempt from tax under existing HMRC treatment of spread betting and gambling income
- For frequent or organised activity: HMRC may reclassify as trading — subject to Income Tax (20–45%)
- Alternatively, if characterised as crypto holdings: Capital Gains Tax (18–24%) applies to USDC conversions exceeding the annual exemption threshold (£3,000 in 2026)
The tax position remains genuinely uncertain. Numerous UK Polymarket participants document returns using cryptocurrency CGT methodology and employ platforms such as Koinly or CoinTracker to produce tax-compliant documentation for HMRC submission.
UK-Relevant Markets on Polymarket
- General Elections: Following the 2024 election cycle, the next scheduled general election is 2029. Active markets cover by-election outcomes, polling trends, and party leadership transitions
- Premier League: Championship winner, relegation battles and European qualification contests throughout each season
- UEFA Champions League: Arsenal, Chelsea, Manchester City — all feature substantial trading volumes
- 2026 FIFA World Cup: England qualification and tournament winner contracts trading between 13–15%
- Bank of England Monetary Policy: Base rate forecasts for each MPC decision date
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 chargeable income. The taxability of Polymarket returns hinges on trading intensity and HMRC's ultimate classification of your activity. Occasional traders may benefit from gambling income exemptions; those engaging in systematic activity will likely encounter Income Tax or CGT obligations. Seek professional tax advice tailored to your circumstances.
- Can I withdraw to a UK bank account?
- Direct bank withdrawal is unavailable. USDC conversion to sterling must occur on a UK-authorised crypto exchange (Kraken, Coinbase) before funds reach your bank account. The process typically requires 1–3 business days via Faster Payments infrastructure.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC authorisation with FSCS protections. Polymarket functions as a decentralised protocol: assets reside in smart contracts rather than centralised custody — eliminating single points of failure but forfeiting FSCS coverage and UKGC dispute resolution if problems materialise.