UK Crypto Gains Top £1.38B; 240 Investors Hit £1M+

HMRC records £1.38 billion in crypto capital gains for 2024–25

HM Revenue & Customs (HMRC) logged a total of £1.38 billion in taxable crypto capital gains for the 2024–25 tax year, according to new statistics published on Aug. 27. The figures reflect the first tax year in which taxpayers completed a dedicated Self Assessment section for crypto disposals, giving the UK tax authority a clearer view of on-chain trading activity and taxable events.

The dataset shows 17,600 individuals reported disposals of cryptoassets subject to Capital Gains Tax (CGT). Those disposals generated £13.8 billion in proceeds, while declared gains averaged roughly £78,000 per person. At the top end of the distribution, a cohort of 240 investors each reported more than £1 million in crypto gains, collectively accounting for £717 million of the total gains reported.

What counts as a taxable crypto disposal?

HMRC defines disposals that can trigger CGT to include selling crypto for fiat, swapping one crypto asset for another, spending crypto on goods or services, and transferring assets to another person where the transfer does not qualify for an exemption. Income from mining, staking or other crypto-related activity remains reportable under Income Tax rules rather than the capital gains section.

New reporting format gives HMRC sharper insight

The 2024–25 tax year was the first to require a separate line for crypto capital gains on Self Assessment returns. In prior years, crypto disposals were declared within the general CGT fields, which made it harder for HMRC to isolate crypto-specific trends. The dedicated reporting section makes it easier for tax authorities to analyze patterns of gains, identify large taxpayers and prioritize compliance work.

HMRC also said its targeted compliance and education activities around cryptoassets generated an estimated additional £168 million in CGT for 2024–25. That reflects a combination of outreach, guidance and enforcement designed to improve voluntary compliance among crypto investors.

Demographics and average gains

The statistics reveal a striking gender imbalance: about 87% of individuals reporting crypto gains were men, and roughly 13% were women. This mirrors observations in broader crypto-market demographics and underscores ongoing conversations about diversity in crypto investing.

While the average declared gain among reporters was approximately £78,000, the top 240 taxpayers drove a disproportionate share of the total: those high‑net‑worth crypto traders reported average gains well above the median, contributing more than half of the entire £1.38 billion sum.

HMRC ramps up outreach with nudge letters

Separately, accountancy firm UHY Hacker Young reported that HMRC issued roughly 81,000 so‑called nudge letters to crypto investors in the last 12 months, indicating suspected underpayment of tax. That marks a 25% increase from the roughly 65,000 letters sent the prior year and nearly triple the 27,714 recorded in 2023–24.

Nudge letters invite recipients to engage with HMRC, disclose unpaid tax and settle liabilities before a formal investigation is opened. The sharp rise in these notices suggests HMRC believes undeclared CGT from crypto trading—especially during the market rally spanning late 2022 through October 2025—remains a material compliance risk.

UHY Hacker Young partners have warned the situation could intensify once HMRC gains access to wider datasets collected from crypto exchanges under international reporting rules. "Once HMRC has this data then tax investigations into cryptocurrency investors will be like shooting fish in a barrel," one partner said, noting that basic AI-powered tools could cross-reference exchange records with taxpayers' returns.

What taxpayers should do now

UK residents with crypto gains above the annual CGT allowance for the 2025–26 tax year must report those gains via Self Assessment and pay any tax due by Jan. 31, 2027. Anyone who receives a nudge letter should respond promptly and consider seeking professional tax advice to reduce the risk of penalties or investigations.

CARF and the international widening of crypto tax reporting

HMRC’s future visibility into taxpayers’ crypto activity is set to expand through the Organisation for Economic Co-operation and Development’s (OECD) Crypto-Asset Reporting Framework (CARF). The UK began implementing CARF in January 2026, and HMRC expects to start receiving customer-level data collected by cryptoasset service providers in 2027.

CARF is designed to enable jurisdictions to exchange detailed information on crypto users and their transactions, providing tax authorities with transaction histories and identity data they can compare against what taxpayers declare. The Treasury previously estimated CARF adoption could generate roughly £35 million in additional revenue for the 2026–27 fiscal period, rising to about £95 million in 2027–28.

Phased roll-out and jurisdiction coverage

For UK taxpayers, UHY Hacker Young anticipates HMRC will automatically receive information from crypto platforms in 52 jurisdictions starting May 31, 2027, with another 15 jurisdictions scheduled to begin reporting in 2028. The incoming CARF data will include customer identities, tax identification numbers and transaction records—information HMRC can use to spot undeclared gains more effectively.

Similar reporting regimes have already taken effect elsewhere; for example, European Union crypto platforms began collecting identity and transaction data under DAC8 on Jan. 1, 2026, with the first full-year reports due in 2027. As global reporting standards converge, cross-border exchange of crypto data will significantly strengthen tax administrations’ ability to detect and deter noncompliance.

Policy developments and market implications

The UK’s treatment of crypto investments has evolved in recent years. In January 2023 HMRC extended certain investment management tax exemptions to qualifying crypto transactions involving overseas investors. More recently, in April 2026 the removal of crypto exchange-traded notes (ETNs) from standard Individual Savings Accounts prompted some fintech firms—such as Stratiphy—to explore alternatives like offering ETNs through Innovative Finance ISAs as a tax-advantaged route.

For investors, these regulatory shifts mean greater scrutiny of crypto holdings and a higher probability that on-chain activity will be matched to tax filings. Market participants should prioritize accurate records of disposals, receipts and transfers, including dates, values in GBP at the time of each transaction, and the nature of each disposal.

Preparing for the CARF era

As the CARF reporting timeline approaches, exchanges and other cryptoasset service providers will be collecting more comprehensive user data. Crypto investors should therefore expect that previously private activity may soon be visible to tax authorities. Maintaining clear, auditable records and seeking advice on tax-reporting obligations now can mitigate the risk of penalties and unexpected liabilities once cross-border data flows commence.

Conclusion

HMRC’s first dedicated crypto capital gains dataset highlights both the scale of taxable crypto gains in the UK and the concentration of those gains among a relatively small group of investors. With nudge letters already rising and CARF-based data exchanges on the horizon, the UK tax landscape is moving toward greater transparency and enforcement. Crypto investors should treat tax compliance as a core part of portfolio management and be proactive about recordkeeping, reporting and professional guidance.