
HMRC counted 17,600 crypto filers with £13.8B in disposals in 2024-25; CARF reporting from 2027 will give HMRC new visibility on undeclared gains.
HM Revenue and Customs counted 240 people who each declared more than £1 million ($1.35 million) in cryptoasset gains in the 2024–25 tax year. The figures appeared in the department's yearly Capital Gains Tax release, the first breakdown of its kind.
The 240 filers reported £717 million ($974 million) between them, just over half of all crypto gains declared to HMRC that year. The wider pool ran to 17,600 people who made cryptoasset disposals liable for capital gains tax. Disposal proceeds reached £13.8 billion ($18.8 billion). Taxable profit came to £1.38 billion ($1.88 billion), an average gain of about £78,000. Men made up about 87% of filers and women about 13%.
James Murray, Financial Secretary to the Treasury, said in a statement accompanying the release that taxes are due on cryptoasset gains "just like any other gains."
Blockchain analytics firm Chainalysis put UK taxable crypto activity at $19.4 billion in 2025, fourth-highest among the countries it measured. Of that, $6.0 billion is capital gains and $3.3 billion is income; payments account for $10.1 billion. Chainalysis called the approach conservative and the total a lower boundary. The estimate covers six blockchains and does not count activity on centralized exchanges, along with some transaction types and venues.
The Cryptoasset Reporting Framework took effect in January 2026, and providers that fail to comply face a £300 fine for each customer. Under the framework, cryptoasset service providers must report customer information to tax authorities. HMRC will receive that data from 2027, the press release said, helping it identify gains and income that have not been declared.
Chainalysis found CARF covers 14% of on-chain taxable activity worldwide. Decentralized exchange trades, peer-to-peer transfers, on-chain income, and payments make up the other 86%.
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