Crypto Tax in the UK Set to Change in 2026 – Full Details of CARF Rules

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The UK government is taking a bold step to tighten crypto regulations. Starting in 2026, crypto service providers must collect and report user data under the OECD’s Crypto-Asset Reporting Framework (CARF) — a global initiative aimed at boosting tax transparency and curbing evasion.

This move places the UK in sync with over 40 countries, including all EU member states, and has massive implications for both centralized and decentralized crypto platforms.

What Are CARF Rules and Why Is the UK Adopting Them?

The Crypto-Asset Reporting Framework (CARF) was developed by the Organisation for Economic Co-operation and Development (OECD) — an international body of 38 member countries — to tackle tax evasion in the digital asset space.

By adopting CARF, the UK aims to:

• Enhance transparency in crypto transactions
  
• Align with international tax standards
  
• Prevent offshore tax avoidance using digital assets
  

Key Dates You Must Know

• 2026: UK-based and foreign crypto service providers (CASPs) must start collecting user identity and transaction data.
  
• May 31, 2027: First deadline for annual reporting.
  

Even if you’re not based in the UK, if you serve UK users, you must comply.

Which Users Are Affected?

CASPs must report:

• All UK tax residents
  
• Users from countries implementing CARF rules (over 40 jurisdictions expected)
  

They must collect data from all users, but reporting is limited to those residing in CARF-compliant countries.

EU’s DAC8 rules will work in tandem with CARF, requiring EU-focused crypto firms to also follow strict transparency measures.

What Data Must Be Collected?

Crypto firms will be required to gather:

• User identity details
  
• Transaction data (including volumes, timestamps, and counterparties)
  

This applies to:

• Exchanges
  
• Custodial wallets
  
• Transfer service providers
  

What Happens If CASPs Don’t Comply?

Non-compliance with CARF can result in:

• Fines of up to €300 per user
  
• Penalties for late, inaccurate, or missing filings
  

CASPs are strongly advised to start building reporting infrastructure now to avoid future penalties.

Impact on Decentralized and Non-Custodial Platforms

The new rules are expected to challenge the business models of:

• Decentralized exchanges (DEXs)
  
• Non-custodial wallets
  

These platforms emphasize user privacy and flexibility, which may not align with CARF requirements. The industry is watching closely for additional UK government guidance.

There are already rumors of some firms considering an exit from the UK due to the high cost of compliance.

Final Thoughts

The UK’s adoption of CARF signals a new era of regulation in the crypto space. While the goal is more security and transparency, it could come at the cost of privacy and decentralization — values many in the crypto community hold dear.Crypto businesses must now adapt, prepare, or relocate, as 2026 draws closer.