In this guide
Bottom line: Polymarket remains technically available to UK residents but exists within an uncertain regulatory landscape. Access is straightforward via crypto wallets without regional restrictions. Tax implications: earnings are probably liable to Income Tax (20–45%) or CGT (18–24%). PolyGram delivers a UK-tailored platform connected to the same Polymarket liquidity pool.
Polymarket's standing as a UK prediction market venue presents a distinctive regulatory puzzle. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly outlawed Polymarket. Because it functions through decentralised crypto wallets and on-chain smart contracts rather than conventional GBP bank transfers, it circumvents the licensing regime that applies to conventional betting operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nonetheless, it remains unprohibited for UK-based participants. The principal regulatory considerations are:
- Absence of geo-restrictions for UK internet users — in contrast to US-based participants who face access barriers
- Cryptocurrency-only settlement — Polymarket accepts solely USDC on Polygon, a digital asset rather than a controlled payment instrument under the Gambling Act 2005
- FCA framework: Digital assets fall under the Financial Services and Markets Act 2023, yet prediction market instruments remain outside its scope
- UKGC guidance: No formal statement regarding Polymarket has been issued as of May 2026
Empirically: Since Polymarket's 2020 inception, UK participants have maintained uninterrupted service access, with no recorded prosecutions or sanctions against private users.
Depositing into Polymarket from the UK
Deposit pathways available to UK residents via PolyGram:
- Kraken UK: BACS or Faster Payments → acquire USDC → transfer to Polygon address (~10 minutes)
- Coinbase UK: Bank transfer or payment card → obtain 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:
- If activity is infrequent (non-professional): Returns may qualify as gambling proceeds — exempt from tax under prevailing HMRC rules for spread-betting and gambling outcomes
- If activity is frequent/professional: HMRC may reclassify as a business — liable for Income Tax (20–45%)
- Alternatively, if categorised as crypto holdings: Capital Gains Tax (18–24%) applies when USDC is converted above the annual exemption threshold (£3,000 in 2026)
The actual tax position remains unclear. Numerous UK Polymarket participants handle their returns through the crypto CGT framework and employ services such as Koinly or CoinTracker to produce HMRC-acceptable documentation.
UK-Relevant Markets on Polymarket
- UK General Election: Following the 2024 election, the subsequent GE is scheduled for 2029. Active markets exist for by-elections, polling data, and party leadership contests
- Premier League: Championship outcomes, bottom-three finishes, and top-division placement contracts throughout the campaign
- Champions League: Arsenal, Chelsea, Manchester City — all featuring live European competition markets
- World Cup 2026: England finalist odds trading between 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 reporting of all chargeable income. Polymarket earnings' taxability hinges on your trading pattern and how HMRC categorises your activity. Occasional participants may benefit from the gambling exemption; frequent traders will typically owe Income Tax or CGT. Seek guidance from a qualified UK tax specialist tailored to your circumstances.
- Can I withdraw to a UK bank account?
- Direct withdrawal is unavailable. USDC must first be exchanged for GBP on a UK-authorised platform (Kraken, Coinbase) before moving funds to your bank. Standard Faster Payments processing typically requires 1–3 working days.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC licensing with FSCS safeguards. Polymarket functions as a blockchain system: assets reside in decentralised protocols rather than a centralised institution — eliminating single points of failure but forfeiting FSCS or UKGC recourse mechanisms if disagreements occur.