In this guide
Bottom line: Polymarket remains technically available to UK residents but exists within an uncertain regulatory environment. British traders can access it through crypto wallets without IP restrictions. Fiscal obligations: earnings are probably liable to Income Tax (20–45%) or CGT (18–24%). PolyGram delivers a UK-tailored experience on the identical Polymarket order book.
Polymarket's status as a UK prediction market operator presents a complex regulatory landscape. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly prohibited the platform. Because it functions through blockchain-based smart contracts and crypto wallets rather than conventional GBP bank transfers, it circumvents the regulatory apparatus applicable to established betting exchanges such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nevertheless, it remains unambiguously unlawful for UK residents. Critical regulatory considerations include:
- Absence of geo-blocking for UK-based users — in contrast to US-based traders who face access restrictions
- Cryptocurrency-only settlement — Polymarket exclusively accepts 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 outside explicit regulatory scope
- UKGC guidance: As of May 2026, no formal statement addressing Polymarket specifically has been issued
Practically speaking: Since Polymarket's 2020 inception, UK-based participants have enjoyed continuous service availability, with no reported regulatory enforcement targeting individual UK traders.
Depositing into Polymarket from the UK
Accessible deposit pathways for UK traders via PolyGram:
- Kraken UK: BACS or Faster Payments → acquire USDC → transfer to Polygon address (~10 minutes)
- Coinbase UK: Bank transfer or debit card → 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 earnings from crypto-based prediction markets follows these principles:
- If activity is infrequent (recreational pursuit): Earnings might qualify as gambling proceeds — non-taxable under prevailing HMRC rules for betting and gaming
- 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 in 2026)
The fiscal position remains unclear and contested. Numerous UK Polymarket participants handle their earnings through cryptocurrency CGT frameworks, employing platforms such as Koinly or CoinTracker to produce HMRC-acceptable documentation.
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 transitions
- Premier League: Championship winners, bottom-three finishers, and top-four qualification throughout the campaign
- Champions League: Arsenal, Chelsea, Manchester City — all featuring live European competition markets
- World Cup 2026: England tournament victory market trading between 13–15%
- Bank of England: Base rate expectation markets aligned with each MPC decision date
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 trigger a tax obligation hinges on frequency and how HMRC categorises your activity. Occasional participants may benefit from gambling exemptions; those trading regularly will likely owe Income Tax or CGT. Seek guidance from a qualified UK tax professional regarding your circumstances.
- Can I withdraw to a UK bank account?
- Direct withdrawal is unavailable. USDC must first be exchanged for GBP through a UK-authorised platform (Kraken, Coinbase) before transferring funds to your bank. Processing typically requires 1–3 business days via standard Faster Payments.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC licence with FSCS protections in place. Polymarket operates on-chain: assets reside in decentralised smart contracts rather than a centralised entity — eliminating single-point-of-failure risk but forfeiting FSCS or UKGC safeguards should conflicts emerge.