Bottom line: Polymarket remains accessible to UK-based traders but sits within regulatory uncertainty. British residents can engage via cryptocurrency wallets without IP restrictions. Taxation of profits: likely falls under Income Tax (20–45%) or CGT (18–24%) depending on activity classification. PolyGram delivers a UK-tailored platform interface connected to the same Polymarket liquidity pool.
Within the UK market landscape, Polymarket occupies a distinctive regulatory space. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly outlawed Polymarket. Because it functions through decentralised crypto wallets and blockchain-based settlement rather than conventional GBP accounts, it circumvents the statutory regimes applicable to established betting exchanges such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nevertheless, it remains unlisted among prohibited services for British participants. Essential regulatory considerations include:
- Absence of geo-blocking for UK traffic — in contrast to American users who face access restrictions
- Cryptocurrency settlement only — 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 within the Financial Services and Markets Act 2023 remit, yet prediction market derivatives remain unaddressed in guidance
- UKGC guidance: No formal statement regarding Polymarket exists as of May 2026
Empirically: Since Polymarket's 2020 inception, UK participants have enjoyed uninterrupted service without reported regulatory prosecution at the individual level.
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 address (~10 minutes)
- Coinbase UK: Card or bank transfer → obtain USDC → move to Polygon
- PolyGram direct: Visa or Mastercard payment → USDC credited instantaneously to your PolyGram holding wallet
UK Tax Treatment of Polymarket Winnings
HMRC's approach to crypto-based prediction market returns operates as follows:
- Where engagement is infrequent (non-professional): Proceeds may qualify as gambling returns — potentially exempt from tax under HMRC's current treatment of spread betting and gambling-related gains
- Where engagement is frequent/professional: HMRC may reclassify activity as a business — triggering Income Tax liability (20–45%)
- Alternatively, if characterised as a crypto holding: Capital Gains Tax (18–24%) applies on USDC sales exceeding the annual CGT exemption threshold (£3,000 for 2026)
The tax position remains genuinely uncertain. Numerous UK Polymarket participants handle their returns through the cryptocurrency CGT framework and employ platforms such as Koinly or CoinTracker to produce HMRC-acceptable documentation.
UK-Relevant Markets on Polymarket
- UK General Election: Following the 2024 election cycle, the subsequent general election is scheduled for 2029. Available markets cover by-elections, polling trends, and potential leadership transitions
- Premier League: Championship, bottom-three finishers and European qualification markets across the campaign
- Champions League: Arsenal, Chelsea, Manchester City — each with substantial liquidity in European competition markets
- World Cup 2026: England outright winner market trading between 13–15%
- Bank of England: Interest rate guidance 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 tax. Polymarket returns' taxability hinges on trading intensity and HMRC's categorisation of your activity. Occasional participants may benefit from the gambling exemption; those engaged in systematic activity face probable 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 withdrawal is unavailable. USDC requires conversion to sterling through a UK-authorised crypto platform (Kraken, Coinbase) before bank transfer. Settlement typically requires 1–3 business days via standard Faster Payments rails.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC licensing with FSCS safeguards. Polymarket functions on-chain: assets reside within smart contracts rather than a centralised intermediary — eliminating single points of failure yet forgoing FSCS or UKGC remedies should contractual disputes materialise.