In this guide
Bottom line: Polymarket remains accessible to UK residents but occupies an uncertain regulatory space. British traders can participate through crypto wallets without location restrictions. Tax obligations: gains are probably liable to Income Tax (20–45%) or CGT (18–24%). PolyGram delivers a UK-tailored platform experience connected to the same Polymarket liquidity pool.
Within the UK's prediction market landscape, Polymarket occupies a distinctive regulatory position. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly restricted Polymarket. Because it functions through cryptocurrency wallets and decentralised blockchain contracts rather than conventional GBP accounts, it sidesteps the regulatory apparatus governing established betting exchanges such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nonetheless, it remains unprohibited for UK-based traders. The principal regulatory considerations are:
- Absence of geo-restrictions for UK internet users — in contrast to American traders who face blocking
- Cryptocurrency-only funding — Polymarket exclusively accepts USDC on Polygon, which falls outside regulated payment frameworks under the Gambling Act 2005
- FCA approach: Digital assets fall under the Financial Services and Markets Act 2023, though prediction market instruments remain undefined
- UKGC guidance: No formal statement regarding Polymarket has been published as of May 2026
Practically speaking: Since Polymarket's 2020 inception, UK participants have enjoyed continuous service with no recorded regulatory action against individual traders.
Depositing into Polymarket from the UK
Accessible deposit pathways through PolyGram for UK residents:
- Kraken UK: Bank transfer or Faster Payments → acquire USDC → transfer to Polygon address (~10 minutes)
- Coinbase UK: Card or bank transfer → purchase USDC → move to Polygon
- PolyGram direct: Visa or Mastercard debit card → USDC instantly credited to your PolyGram account
UK Tax Treatment of Polymarket Winnings
HMRC's approach to cryptocurrency-based prediction market earnings:
- If activity is infrequent (recreational): Earnings might qualify as gambling returns — no tax liability under prevailing HMRC rules for betting and gambling
- If activity is frequent/professional: HMRC may deem it a business — liable to Income Tax (20–45%)
- Alternatively, if categorised as crypto holdings: Capital Gains Tax (18–24%) applies when USDC is sold above the annual exemption threshold (£3,000 for 2026)
The tax position remains genuinely unclear. Numerous UK Polymarket participants handle their earnings using cryptocurrency CGT frameworks and employ software such as Koinly or CoinTracker to produce tax-compliant documentation for HMRC.
UK-Relevant Markets on Polymarket
- UK General Election: Following the 2024 election, the subsequent general election is scheduled for 2029. Active markets cover by-elections, polling data, and party leadership contests
- Premier League: Championship winner, bottom-three finishers and European qualification markets throughout each campaign
- Champions League: Arsenal, Chelsea, Manchester City — featuring substantial trading volumes in European competition markets
- World Cup 2026: England tournament victory market 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 disclosure of all income subject to tax. Whether Polymarket earnings are taxable hinges on your trading pattern and HMRC's categorisation of your activity. Occasional participants might benefit from gambling exemptions; active traders will likely owe Income Tax or CGT. Seek personalised advice from a UK tax professional.
- Can I withdraw to a UK bank account?
- Direct bank withdrawal is unavailable. USDC must first be exchanged for GBP through a UK-authorised crypto platform (Kraken, Coinbase) before transferring to your account. Processing typically requires 1–3 business days via Faster Payments.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC licence and provides FSCS safeguards. Polymarket functions as a blockchain protocol: your assets sit in smart contracts rather than a centralised entity — eliminating single-point-of-failure risks but forgoing FSCS or UKGC recourse if complications occur.