In this guide
Bottom line: Polymarket remains technically accessible to UK residents but exists within an uncertain regulatory environment. British users can participate through cryptocurrency wallets without country restrictions. Tax implications: profits are likely subject to Income Tax (20–45%) or CGT (18–24%) depending on trading classification. PolyGram delivers a UK-tailored platform interface connected to the same Polymarket liquidity pool.
For UK prediction market participants, Polymarket occupies a distinctive regulatory space. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly restricted Polymarket operations. Because the platform functions through blockchain wallets and decentralised smart contracts rather than conventional sterling accounts, it circumvents the licensing regime applicable to conventional betting operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nevertheless, it remains unprohibited for British residents. The principal regulatory considerations include:
- Absence of geo-restrictions affecting UK internet connections — in contrast to American users who encounter blocking
- Cryptocurrency-only funding — 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 undefined
- UKGC guidance: No formal statement addressing Polymarket specifically as of May 2026
Practically speaking: British users have maintained consistent platform access since Polymarket's inception in 2020, with no reported regulatory action directed at individual participants.
Depositing into Polymarket from the UK
Accessible funding pathways for UK participants via PolyGram:
- Kraken UK: Bank transfer via BACS or Faster Payments → acquire USDC → transfer to Polygon address (~10 minutes)
- Coinbase UK: Card payment or bank deposit → obtain USDC → move to Polygon
- PolyGram direct: Visa or Mastercard → USDC credited instantly to your PolyGram account
UK Tax Treatment of Polymarket Winnings
HMRC's approach to crypto-based prediction market profits operates as follows:
- Where activity is infrequent (recreational pursuit): Profits may qualify as gambling returns — exempt from tax under prevailing HMRC treatment of betting and gambling proceeds
- Where activity is frequent/organised: HMRC may characterise this as commercial trading — subject to Income Tax (20–45%)
- Alternatively, if classified as digital asset investment: 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 British Polymarket participants report earnings using cryptocurrency CGT methodology 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, subsequent GE anticipated in 2029. Available markets include by-election outcomes, polling data, and potential leadership transitions
- Premier League: Championship, bottom-three, and top-four finish predictions throughout each campaign
- Champions League: Arsenal, Chelsea, Manchester City — each maintaining substantial CL trading activity
- World Cup 2026: England tournament victory market trading at 13–15%
- Bank of England: Interest rate direction markets corresponding to each Monetary Policy Committee decision
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 profits. Whether Polymarket earnings trigger tax liability hinges on trading intensity and HMRC's categorisation. Occasional participants may benefit from gambling exemptions; active traders typically encounter Income Tax or CGT obligations. Seek guidance from a qualified UK accountant regarding your circumstances.
- Can I withdraw to a UK bank account?
- Direct withdrawal is unavailable. USDC must be exchanged for GBP through a UK-authorised crypto platform (Kraken, Coinbase) before transferring funds to your bank. Processing typically requires 1–3 working days via standard Faster Payments.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC oversight and incorporates FSCS safeguards. Polymarket functions as a decentralised protocol: assets reside in smart contracts rather than a centralised entity — eliminating single-point-of-failure risk, yet forfeiting FSCS or UKGC recourse mechanisms should conflicts materialise.