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HMRC's first dedicated crypto capital gains dataset shows 240 UK individuals reported gains above £1 million each during the 2024-25 tax year, accounting for £717 million of the £1.38 billion in total taxable crypto gains filed by 17,600 people. Total disposal proceeds reached £13.8 billion, with an average gain of £78,000 per filer. The figures land as HMRC escalates pressure on suspected under-declarers, sending 81,000 "nudge" letters in the past year, up 25% from the prior period.
Why it matters
The 2024-25 tax year was the first in which Self Assessment returns carried a dedicated crypto capital gains section, separating digital assets from the broader CGT box and producing the cleanest read yet on UK retail crypto profitability. HMRC's parallel enforcement push is no coincidence. Nudge letters rose from 27,714 in 2023-24 to 81,000 over the past year, an almost threefold increase in a single cycle, as the authority widens its net ahead of the OECD's Cryptoasset Reporting Framework taking effect.
From May 2027, HMRC will automatically receive customer data on UK residents from crypto exchanges in 52 jurisdictions, with 15 more following in 2028. Neela Chauhan, partner at accountancy firm UHY Hacker Young, called the incoming dataset the moment HMRC's enforcement capacity crosses a threshold. "Once HMRC has this data then tax investigations into cryptocurrency investors will be like shooting fish in a barrel," she said. "With this data and some fairly basic AI built software, HMRC will be able to build a comprehensive list of all cryptocurrency investors that are behind on their CGT or income tax."
Market impact
For UK-based crypto traders, the gap between voluntary disclosure and HMRC's reach is closing fast. The first batch of data covers Bitcoin (BTC), Ether (ETH) and Dogecoin (DOGE) disposals, but the framework extends to any cryptoasset service provider reporting under the OECD rules. Crypto-to-crypto swaps, spending crypto on goods or services, and certain gifts all count as taxable events, meaning the £1.38 billion figure likely understates the true scale of activity the authority will see once the 2027 data flow begins.
Frequently asked questions
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How many UK individuals reported crypto capital gains above £1 million in 2024-25?
HMRC's first dedicated crypto CGT dataset shows 240 individuals reported gains above £1 million, accounting for £717 million of the £1.38 billion in total taxable crypto gains filed that year.
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What was the total value of UK crypto capital gains filed in 2024-25?
17,600 individuals filed taxable crypto capital gains, reporting £13.8 billion in disposal proceeds and £1.38 billion in total gains, with an average gain of £78,000 per filer.
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How many HMRC "nudge" letters did UK crypto investors receive?
HMRC sent 81,000 nudge letters to suspected under-declarers in the past year, up 25% from 65,000 a year earlier and roughly triple the 27,714 sent in 2023-24.
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When will HMRC start receiving automatic crypto investor data from overseas exchanges?
From May 31, 2027, HMRC will automatically receive customer data on UK residents from crypto exchanges in 52 jurisdictions under the OECD's Cryptoasset Reporting Framework, with 15 more jurisdictions joining in 2028.
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What crypto transactions count as taxable events in the UK?
Selling crypto, exchanging one cryptoasset for another, using crypto to pay for goods or services, and certain gifts can all trigger UK capital gains tax events.
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