In this guide
Bottom line: Polymarket remains technically usable by UK residents but occupies an uncertain regulatory space. Access is available through crypto wallets without country restrictions. Tax implications: earnings are probably liable to Income Tax (20–45%) or CGT (18–24%). PolyGram delivers a UK-tailored platform interface connected to the same Polymarket liquidity pool.
Within the UK prediction market landscape, Polymarket occupies a peculiar regulatory standing. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly forbidden Polymarket. Because it functions through decentralised crypto wallets and blockchain-based contracts rather than conventional sterling accounts, it circumvents the regulatory apparatus that applies to established operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nevertheless, it is not formally prohibited for British users. The essential regulatory considerations are:
- Absence of geo-blocking for UK internet connections — in contrast to American users who face access restrictions
- Cryptocurrency-only funding — Polymarket accepts exclusively USDC on Polygon, a digital asset rather than a regulated payment instrument under the Gambling Act 2005
- FCA approach: Digital assets fall under the Financial Services and Markets Act 2023, though prediction market instruments remain unspecified
- UKGC guidance: No published statement regarding Polymarket specifically as of May 2026
In reality: British users have maintained continuous access from Polymarket's inception in 2020, with no reported enforcement proceedings against individual UK participants.
Depositing into Polymarket from the UK
Accessible funding pathways through PolyGram:
- Kraken UK: BACS or Faster Payments → acquire USDC → transfer to Polygon address (~10 min)
- Coinbase UK: Bank transfer or debit card → obtain USDC → move to Polygon
- PolyGram direct: Visa or Mastercard debit → USDC is credited instantly to your PolyGram account
UK Tax Treatment of Polymarket Winnings
HMRC's treatment of crypto-based prediction market earnings follows this framework:
- If activity is infrequent (leisure pursuit): Earnings might qualify as gambling returns — exempt from tax under prevailing HMRC rules for spread betting and gambling proceeds
- If activity is frequent/organised: HMRC may deem it a business — liable to Income Tax (20–45%)
- Alternatively, if categorised as crypto holdings: Capital Gains Tax (18–24%) applies to USDC conversions exceeding the yearly CGT exemption (£3,000 in 2026)
The tax position remains genuinely unclear. Numerous UK Polymarket participants report earnings using cryptocurrency CGT methodology and employ platforms like 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 projections, 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 robust CL trading
- World Cup 2026: England tournament victory market trading at 13–15%
- Bank of England: Base rate decision markets for each Monetary Policy Committee session
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 assessable revenue. Whether Polymarket earnings qualify as taxable hinges on trading intensity and HMRC's categorisation. Occasional participants may benefit from gambling exemptions; frequent traders are expected to pay 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 must be exchanged for GBP on a UK-authorised platform (Kraken, Coinbase) before moving funds to your bank. Processing typically requires 1–3 working days through the Faster Payments scheme.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC licence and provides FSCS safeguards. Polymarket functions on-chain: assets reside in smart contracts rather than a centralised operator — eliminating single points of weakness, but providing no FSCS or UKGC recourse if conflicts emerge.