Bottom line: Polymarket remains technically accessible to UK residents but operates within a regulatory grey area. British traders can participate via crypto wallets without IP-based restrictions. Tax implications: earnings are likely subject to either Income Tax (20–45%) or CGT (18–24%). PolyGram delivers a UK-tailored platform interface connected to the same Polymarket liquidity pool.
As a UK prediction market platform, Polymarket occupies a distinctive regulatory niche. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly prohibited Polymarket. Because it functions through blockchain-based smart contracts and crypto wallets rather than conventional sterling accounts, it sidesteps the regulatory architecture that applies to licensed operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nevertheless, it remains unambiguously legal for UK residents to use. The principal regulatory considerations are:
- No geo-blocking applied to UK internet addresses — in contrast to US-based users who face access restrictions
- No GBP deposits — Polymarket exclusively accepts USDC on Polygon, a cryptocurrency rather than a regulated payment instrument under the Gambling Act 2005
- FCA approach: Crypto assets fall under the Financial Services and Markets Act 2023, though prediction market contracts remain outside specific regulatory scope
- UKGC guidance: No formal statement addressing Polymarket specifically as of May 2026
Empirically: Since Polymarket's 2020 launch, UK participants have maintained continuous access without reported enforcement proceedings against individual traders.
Depositing into Polymarket from the UK
Accessible deposit pathways for UK traders via PolyGram:
- Kraken UK: Bank transfer via BACS or Faster Payments → acquire USDC → transfer to Polygon address (~10 minutes)
- Coinbase UK: Bank transfer or debit card payment → obtain USDC → move to Polygon
- PolyGram direct: Visa or Mastercard debit payment → USDC is instantly credited to your PolyGram account
UK Tax Treatment of Polymarket Winnings
HMRC's approach to crypto-based prediction market earnings operates as follows:
- If activity is sporadic (non-professional): Earnings may qualify as gambling proceeds — tax-exempt under prevailing HMRC rules for spread betting and gambling activities
- If activity is frequent/professional: HMRC may reclassify as business activity — attracting 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 threshold (£3,000 in 2026)
The tax position remains genuinely uncertain. Numerous UK Polymarket traders handle their earnings through cryptocurrency CGT frameworks and employ 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 GE is scheduled for 2029. Active markets include by-election outcomes, polling movements, and party leadership contests
- Premier League: Championship winner, bottom-three finishers and European qualification markets throughout the campaign
- Champions League: Arsenal, Chelsea, Manchester City — all featuring substantial CL trading activity
- World Cup 2026: England tournament victory market currently priced at 13–15%
- Bank of England: Official rate movement markets corresponding to 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 taxable revenue. Polymarket earnings' taxability hinges on your trading pattern and how HMRC categorises your activity. Occasional participants may benefit from gambling exemptions; regular traders face probable Income Tax or CGT obligations. Seek personalised guidance from a qualified UK tax professional.
- Can I withdraw to a UK bank account?
- Direct withdrawal is unavailable. USDC conversion to GBP must occur on a UK-authorised platform (Kraken, Coinbase) before funds reach your bank. Standard Faster Payments processing typically requires 1–3 business days.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC supervision with FSCS safeguards. Polymarket functions on-chain: assets exist within smart contracts rather than centralised custody — eliminating single points of failure but forfeiting FSCS and UKGC protections in case of contractual disputes.