Bottom line: Polymarket is technically accessible from the UK but operates in a regulatory grey zone. UK residents can use it via crypto wallets without geo-blocking. Tax treatment: winnings are likely subject to Income Tax (20–45%) or CGT (18–24%). PolyGram offers a UK-optimised interface on the same Polymarket order book.
As a UK prediction market platform, Polymarket sits in an interesting regulatory position. The UK Gambling Commission (UKGC) has not specifically licensed or prohibited Polymarket. Since it operates via crypto wallets and blockchain smart contracts rather than traditional sterling deposits, it bypasses the frameworks that govern traditional bookmakers like Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket does not have a UKGC licence. However, it is not explicitly banned for UK residents. The key regulatory points:
- No geo-blocking for UK IP addresses — unlike users in the USA who are blocked
- No sterling deposits — Polymarket only accepts USDC on Polygon, which is cryptocurrency, not a regulated payment method under the Gambling Act 2005
- FCA stance: Crypto assets are regulated under the Financial Services and Markets Act 2023, but prediction market contracts are not specifically addressed
- UKGC position: No official guidance specifically on Polymarket as of May 2026
In practice: UK users report uninterrupted access since Polymarket launched in 2020, with no documented enforcement actions against individual UK users.
Depositing into Polymarket from the UK
UK-friendly deposit routes via PolyGram:
- Kraken UK: BACS / Faster Payments → buy USDC → send to Polygon wallet (~10 min)
- Coinbase UK: Debit card or bank transfer → USDC → send to Polygon
- PolyGram direct: Visa/Mastercard debit → USDC is delivered to your PolyGram wallet automatically
UK Tax Treatment of Polymarket Winnings
HMRC treats crypto-denominated prediction market winnings as follows:
- If trading is occasional (hobby): Winnings may be treated as gambling winnings — tax-free under current HMRC guidance for spread bets and gambling wins
- If trading is regular/systematic: HMRC may classify it as a trade — subject to Income Tax (20–45%)
- Alternatively, if treated as crypto investment: Capital Gains Tax (18–24%) on disposal of USDC above the annual CGT allowance (£3,000 in 2026)
The tax treatment is genuinely ambiguous. Many UK Polymarket users report their winnings under cryptocurrency CGT rules and use tools like Koinly or CoinTracker to generate HMRC-compliant reports.
UK-Relevant Markets on Polymarket
- UK General Election: Post-2024 election, next GE is due 2029. Markets on by-elections, opinion polls, leadership challenges
- Premier League: Title, relegation and top-4 markets through the season
- Champions League: Arsenal, Chelsea, Manchester City — all with active CL markets
- World Cup 2026: England tournament winner market at 13–15%
- Bank of England: Base rate prediction markets for each MPC meeting
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 requires declaration of all taxable income. Whether Polymarket winnings are taxable depends on trading frequency and HMRC's classification. Casual traders may qualify for the gambling exemption; systematic traders likely face Income Tax or CGT. Consult a UK tax adviser for your specific situation.
- Can I withdraw to a UK bank account?
- Not directly. USDC must be converted to GBP on a UK-regulated exchange (Kraken, Coinbase) before withdrawing to your bank. This takes 1–3 business days under standard Faster Payments processing.
- Is Polymarket safer than Betfair?
- Betfair is UKGC-regulated and has FSCS protection layers. Polymarket is on-chain: funds are in smart contracts, not a central custodian — meaning no single point of failure, but also no FSCS or UKGC protection if disputes arise.