In this guide
Bottom line: Polymarket remains technically available to UK residents but occupies a regulatory ambiguity. British traders can access it through crypto wallets without restrictions. Tax implications: earnings are probably subject to Income Tax (20–45%) or CGT (18–24%). PolyGram delivers a UK-tailored platform on the identical Polymarket order book.
Within the UK, Polymarket functions as a prediction market in an unusual regulatory space. The UKGC has neither granted nor revoked a licence for Polymarket. Because it functions through blockchain wallets and decentralised smart contracts rather than conventional GBP accounts, it circumvents the regulatory structure that applies to traditional betting operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Yet it remains unlisted as a prohibited service for UK residents. Key regulatory considerations include:
- Absence of geo-blocking for UK internet traffic — in contrast to US-based users who face restrictions
- Cryptocurrency-only funding — Polymarket accepts only USDC on Polygon, a digital asset rather than a regulated payment instrument under the Gambling Act 2005
- FCA framework: Digital assets fall under the Financial Services and Markets Act 2023, though prediction market instruments remain unspecified
- UKGC guidance: No formal statement regarding Polymarket as of May 2026
Empirically: UK traders have maintained uninterrupted service since Polymarket's 2020 inception, with no recorded regulatory action against individual UK participants.
Depositing into Polymarket from the UK
Accessible deposit pathways for UK customers via PolyGram:
- Kraken UK: BACS or Faster Payments → purchase USDC → transfer to Polygon address (~10 min)
- Coinbase UK: Bank transfer or debit card → acquire USDC → move to Polygon
- PolyGram direct: Visa or Mastercard debit → USDC credited instantly to your PolyGram account
UK Tax Treatment of Polymarket Winnings
HMRC's approach to crypto-based prediction market earnings:
- If activity is infrequent (non-professional): Earnings may qualify as gambling returns — no tax liability per current HMRC rules on spread betting and gambling profits
- If activity is frequent/professional: HMRC may deem it commercial activity — liable for Income Tax (20–45%)
- Alternatively, if classified as crypto holdings: Capital Gains Tax (18–24%) applies when USDC is sold above the yearly CGT exemption (£3,000 in 2026)
Tax classification remains uncertain. Numerous UK Polymarket participants file returns using cryptocurrency CGT methodology and employ platforms like Koinly or CoinTracker to produce HMRC-approved documentation.
UK-Relevant Markets on Polymarket
- UK General Election: Following the 2024 election, the subsequent GE is scheduled for 2029. Markets exist for by-elections, polling data, and party leadership contests
- Premier League: Championship winner, bottom-three finishers, and top-four qualification throughout the campaign
- Champions League: Arsenal, Chelsea, Manchester City — all featuring active European competition markets
- World Cup 2026: England tournament victory market priced at 13–15%
- Bank of England: Base 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 taxable revenue. Polymarket earnings' tax status hinges on trading volume and HMRC's categorisation. Occasional participants may fall under the gambling exemption; frequent traders probably owe Income Tax or CGT. Seek guidance from a qualified UK tax specialist regarding your circumstances.
- Can I withdraw to a UK bank account?
- Direct withdrawal is unavailable. USDC conversion to sterling must occur on a UK-authorised crypto platform (Kraken, Coinbase) before transferring funds to your bank. Standard Faster Payments processing requires 1–3 business days.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC licence with FSCS safeguards. Polymarket operates on-chain: assets sit within smart contracts rather than a centralised institution — eliminating single points of failure, yet offering neither FSCS nor UKGC recourse if disagreements occur.