In this guide
Bottom line: Polymarket remains technically available to UK residents but exists within an unclear regulatory framework. British users can access it through crypto wallets without IP restrictions. Tax implications: earnings are likely subject to Income Tax (20–45%) or CGT (18–24%). PolyGram delivers a UK-tailored platform using the same Polymarket order book infrastructure.
Polymarket's position as a UK prediction market venue presents a distinctive regulatory puzzle. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly prohibited the platform. Because it functions via blockchain technology and cryptocurrency wallets rather than conventional sterling accounts, it circumvents the regulatory apparatus that oversees traditional operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket holds no UKGC authorisation. Yet it remains unambiguously unlawful for UK residents. The principal regulatory considerations are:
- Absence of geo-restrictions on UK traffic — in contrast to American users who face blocking
- Cryptocurrency-only funding — Polymarket accepts exclusively USDC on Polygon, bypassing the Gambling Act 2005's oversight of traditional payment channels
- FCA approach: Digital assets fall under the Financial Services and Markets Act 2023, though prediction market instruments receive no explicit treatment
- UKGC guidance: No formal statement regarding Polymarket's status as of May 2026
Empirically: UK participants have maintained uninterrupted platform access since its 2020 inception, with no reported enforcement measures against individual UK traders.
Depositing into Polymarket from the UK
Accessible funding pathways through PolyGram for UK-based participants:
- 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 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 (recreational): Earnings may qualify as gambling returns — potentially exempt from tax under current HMRC rules for betting and gambling
- If activity is frequent/professional: HMRC may deem this a business — subject to Income Tax (20–45%)
- Alternatively, if categorised as crypto holdings: Capital Gains Tax (18–24%) applies to USDC sales exceeding the annual CGT exemption (£3,000 in 2026)
The tax position remains genuinely uncertain. Numerous UK Polymarket participants record their earnings under crypto CGT frameworks and employ services like Koinly or CoinTracker to produce HMRC-acceptable documentation.
UK-Relevant Markets on Polymarket
- UK General Election: Following the 2024 ballot, the subsequent GE is scheduled for 2029. Active markets cover by-elections, polling data, and party leadership contests
- Premier League: Championship contention, bottom-three finishes, and top-four qualification throughout the campaign
- Champions League: Arsenal, Chelsea, Manchester City — each with substantial CL trading activity
- World Cup 2026: England tournament victory odds ranging from 13–15%
- Bank of England: Base rate outcome markets aligned with each Monetary Policy Committee announcement
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 returns are taxable hinges on your trading pattern and how HMRC categorises your activity. Occasional participants may benefit from gambling tax exemptions; those trading regularly will 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 transfer is unavailable. USDC requires conversion to GBP through a UK-authorised crypto exchange (Kraken, Coinbase) prior to bank withdrawal. Processing typically spans 1–3 business days using standard Faster Payments settlement.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC supervision and includes FSCS safeguards. Polymarket functions as a decentralised protocol: assets reside in smart contracts rather than a centralised organisation — eliminating single-point-of-failure risk, but forgoing FSCS and UKGC dispute resolution if issues materialise.