UK HMRC crypto tax rules explained after 240 £1m gains

Start with the number that will make headlines. HMRC says 240 people reported more than £1 million each in cryptoasset capital gains in the 2024 to 2025 tax year, adding up to £717 million between them. But if you own even a small amount of Bitcoin, Ethereum or Dogecoin, the more useful story is not about millionaires. It is that HMRC now has clearer data, clearer forms and a much plainer message: crypto sits inside the tax system, not outside it.

In HMRC’s annual Capital Gains Tax statistics, published on 27 August 2026, 17,600 individuals reported Capital Gains Tax-liable crypto disposals. Together they declared £13.8 billion of disposal proceeds and £1.38 billion of taxable gains, with an average reported gain of about £78,000 each. This is the first time HMRC has published a crypto-specific breakdown after adding a dedicated section to the Self Assessment return. The same release also gives a snapshot of who is showing up in the tax data. Around 87% of people reporting crypto gains were male and about 13% were female. That does not tell us who owns crypto overall, but it does show who is most visible in the official figures.

Let’s slow down on one word: disposal. In everyday speech, people often think a gain only matters when they cash out into pounds. HMRC uses a wider definition. Selling crypto is a disposal, but so is exchanging one cryptoasset for a different one, spending crypto on goods or services, or giving it away to another person. That is where people get caught out. You can stay entirely inside the crypto world and still create a tax event. The main exception mentioned by GOV.UK is gifts to a spouse, civil partner or charity, which are treated differently. For everyone else, moving or using your crypto can matter just as much as selling it.

There is a second rule that often gets mixed up with Capital Gains Tax. Some crypto is taxed as income instead. If you receive crypto through employment, self-employment, mining, staking or lending, HMRC says Income Tax may apply, and National Insurance may apply in some cases too. If you are thinking, 'So which one is it?', the answer can be 'both, at different stages'. A token might come to you as income first, then create a gain or a loss later when you sell or exchange it. HMRC also notes that there is no separate Self Assessment box just for crypto income, so it still has to be reported under the usual Income Tax rules.

The next big change is about reporting. Since January 2026, the UK has been implementing the Cryptoasset Reporting Framework, or CARF, an international standard created by the OECD. Under CARF, cryptoasset service providers will have to report customer information to tax authorities, and HMRC says it will start receiving that data from 2027. This matters because it changes the practical question many people ask: will HMRC know? The direction is clear. Tax authorities are building a system in which platform data can be matched against what users declare, making it harder for undeclared gains or income to stay hidden.

The pressure is not only on individual taxpayers. GOV.UK says service providers that fail to comply with the new reporting rules may face penalties of up to £300 per user. That gives exchanges and other platforms a strong reason to collect cleaner customer information and pass it on in the right format. Ministers are framing all of this as a fairness issue. Financial Secretary James Murray said taxes are due on crypto gains just like any other gains, while HMRC chief executive John-Paul Marks said people should check they are paying any tax owed as the new reporting rules come into force. You do not have to agree with every government message to see the direction of travel: crypto is being treated more and more like mainstream finance.

HMRC says its crypto education and compliance work since late 2023 generated an extra £168 million of Capital Gains Tax in 2024 to 2025. That helps explain why the department is publishing more detail now. This is no longer being handled as a small or unusual corner of the tax system. **What this means for you:** keep records that make sense months later, not just on the day of the trade. Dates, values in pounds, fees, wallet movements and the reason for each transaction can all matter when you work out what has to be reported.

If you already have unpaid tax linked to cryptoassets, HMRC says you can use the Crypto Disclosure Service on GOV.UK. And if you need to report income or gains for the 2025 to 2026 tax year above the relevant allowance, the Self Assessment deadline is 31 January 2027. The millionaire headline will travel furthest, but the deeper lesson is simpler and more useful. If you sell, swap, spend or receive crypto, do not assume the tax question starts later. In many cases, it has already started.