In this guide
Bottom line: Polymarket remains accessible to UK-based traders but exists within an uncertain regulatory landscape. British residents can participate through crypto wallets without IP restrictions. Tax implications: earnings are probably liable to Income Tax (20–45%) or Capital Gains Tax (18–24%). PolyGram delivers a UK-tailored platform interface connected to the same Polymarket liquidity pool.
Polymarket functions as a UK prediction market venue operating in an unusual regulatory environment. The Gambling Commission of the United Kingdom (UKGC) has neither granted a licence to Polymarket nor formally prohibited its use. Because the platform functions through decentralised crypto wallets and blockchain-based contracts rather than conventional GBP accounts, it circumvents the regulatory structures applicable to conventional betting 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:
- Absence of geo-restrictions on UK users — in contrast to American traders who encounter blocking
- Cryptocurrency-only funding — Polymarket accepts solely USDC on Polygon, a digital asset rather than a regulated payment mechanism under the Gambling Act 2005
- FCA approach: Digital assets fall under the Financial Services and Markets Act 2023, yet prediction market instruments remain outside explicit regulation
- UKGC guidance: The regulator has issued no formal position on Polymarket as of May 2026
Practically speaking: Since Polymarket's 2020 inception, UK traders have enjoyed uninterrupted service with no recorded prosecutions of individual participants.
Depositing into Polymarket from the UK
Accessible funding pathways through PolyGram for UK customers:
- Kraken UK: BACS or Faster Payments → acquire USDC → transfer to Polygon address (~10 minutes)
- Coinbase UK: Bank transfer or debit card → USDC → forward to Polygon
- PolyGram direct: Visa or Mastercard debit card → 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 (non-professional): Earnings might qualify as gambling proceeds — exempt from tax under prevailing HMRC rules for gambling and spread-betting gains
- If activity is frequent/professional: HMRC could deem this 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 CGT exemption (£3,000 for 2026)
The tax position remains unclear and contested. Numerous UK Polymarket participants record their gains using cryptocurrency CGT methodology and employ platforms such as Koinly or CoinTracker to produce tax-compliant documentation for HMRC.
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 potential leadership transitions
- Premier League: Championship winner, bottom-three finishers, and European qualification markets throughout the calendar year
- Champions League: Arsenal, Chelsea, Manchester City — all feature in active European competition markets
- World Cup 2026: England's tournament victory odds trading at 13–15%
- Bank of England: Base rate forecasting markets aligned with 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 reporting of all chargeable income. Whether Polymarket earnings constitute taxable income hinges on your trading pattern and how HMRC categorises your activity. Occasional participants might benefit from gambling exemptions; regular traders 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 not possible. USDC must first be converted to pounds sterling through a UK-regulated crypto exchange (such as Kraken or Coinbase) before funds reach your bank. Conversion and transfer typically require 1–3 business days via Faster Payments.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC licence with FSCS safeguards in place. Polymarket functions as a decentralised blockchain system: your capital sits within smart contracts rather than a centralised company — eliminating single-point-of-failure risk but forfeiting FSCS and UKGC protections in the event of disagreements.