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Key Takeaways
- The top 240 filers declared a combined 717 million pounds in crypto gains, while 17,600 total filers reported 1.38 billion pounds, an average of 78,000 pounds per person
- HMRC will begin receiving third-party transaction data from crypto providers in 2027 under the OECD’s Cryptoasset Reporting Framework, enabling cross-checks against self-reported disclosures
- HMRC’s compliance and education efforts already generated an extra 168 million pounds in capital gains tax during the 2024-2025 year, ahead of the 2027 framework taking effect
Britain’s tax authority said 240 individuals declared cryptocurrency capital gains exceeding 1 million pounds, or approximately $1.36 million, each during the 2024-2025 tax year, the first year HM Revenue and Customs broke out crypto gains as a distinct category in personal tax filings.
First-Ever Breakout Reveals Scale of UK Crypto Profits
HMRC said the 240 individuals declared a combined 717 million pounds in crypto capital gains for the tax year ended April 5, 2025. The figure emerged after the introduction of a dedicated cryptoasset section within the U.K.’s self-assessment tax return, marking the first time the agency has isolated crypto-specific gains from other categories of capital gains.
Across the broader taxpayer population, 17,600 people declared taxable crypto disposals for the year, a group HMRC said was almost 90% male. Total taxable gains from digital assets across that group reached 1.38 billion pounds, or approximately $1.77 billion, an average of 78,000 pounds per person.
The gap between the average gain across all 17,600 filers and the far larger sums reported by the top 240 illustrates a heavily skewed distribution, with a small number of large holders accounting for a disproportionate share of total declared profits.
New Reporting Category Followed Years of Limited Visibility
Before this tax year, HMRC’s capital gains data did not separate crypto-related profits from other asset classes, limiting the tax authority‘s visibility into how much revenue the sector was generating relative to other investment categories.
The dedicated crypto section added to the self-assessment form is designed to close that gap going forward, giving HMRC clearer data on compliance trends within the sector year over year.
The 2024-2025 tax year, being the first year this specific breakout was collected, does not yet establish a trend on its own. Future years of comparable data will be needed to determine whether declared crypto gains are rising, falling, or holding steady as a share of overall U.K. capital gains activity.
International Reporting Framework Set to Strengthen Enforcement
HMRC has begun implementing the Cryptoasset Reporting Framework, a standard developed by the Organisation for Economic Co-operation and Development that requires crypto service providers to report customer transaction data directly to tax authorities.
HMRC said it will start receiving that data from providers in 2027, giving the agency a mechanism to cross-check individual taxpayers’ self-reported disclosures against third-party records.
That cross-checking capability, once active, would represent a significant shift from the current system, in which HMRC relies primarily on taxpayers to accurately self-report crypto gains without independent verification from exchanges or other service providers.
The framework mirrors similar international reporting standards already used for traditional banking and investment accounts.
Compliance Efforts Have Already Generated Additional Revenue
HMRC said its compliance and taxpayer education activity generated an additional 168 million pounds, or approximately $228.2 million, in capital gains tax during the 2024-2025 year alone, separate from the amounts taxpayers declared voluntarily through standard filings.
That figure suggests HMRC is already actively pursuing underreported crypto gains ahead of the 2027 start of automatic data-sharing under the new international framework, rather than waiting for that system to become operational before increasing enforcement activity.
