HMRC is urging crypto holders to review their transaction history now, as new reporting rules set to be enforced from 2027 will make previously invisible crypto transactions visible to tax authorities. The measure is expected to raise an extra £315 million over four years, according to HMRC estimates.
What Is Changing?
The tax rules themselves are not new—owning crypto was never tax-free, and selling, swapping, or being paid in crypto can trigger Capital Gains Tax or Income Tax. What changes is the visibility. Under the UK's Cryptoasset Reporting Framework, UK cryptoasset service providers began collecting user data in January 2026. Their first reports to HMRC are due between January and May 2027, covering the 2026 calendar year.
Providers must record each user's name, address, date of birth, tax residence, and for UK residents, their National Insurance number or Unique Taxpayer Reference. Penalties for late or inaccurate reporting can reach up to £300 per user.
Who Is at Risk?
The Financial Conduct Authority estimates around 8% of UK adults—roughly 4.5 million people—now hold crypto. Many assumed their holdings were invisible or that small amounts would never be taxable. However, the Capital Gains Tax annual exempt amount has been frozen at £3,000, meaning even modest disposals can be chargeable.
Harvey Dhillon, CEO at Zmartly, said: "The person caught out is not the sophisticated trader but the everyday holder or side-hustler who bought a little, sold or swapped some, and never thought to put it on a tax return. Crypto was never untaxed. It was just unseen, and that is the only thing changing."
Expert Warnings
Graham Nicoll, Financial Planner at NCL Wealth Partners, urged people to review their transaction history. He said: "This isn't a new tax, but it is a significant shift in transparency. I’ve seen investors who made substantial gains during previous crypto rallies wrongly assume those profits didn't need to be declared. As HMRC receives more data directly from crypto providers, those historic gains are likely to come under greater scrutiny."
Nicoll also noted that investors should not overlook losses: "Properly reporting capital losses now can allow them to be offset against future gains, potentially reducing tax when markets recover or from gains on other assets."
David Stirling, Independent Financial Adviser at Mint Wealth, added: "Crypto was never tax-free, it just felt that way because nobody was really monitoring it, but that time is over. From January 2026, every exchange operating in the UK had started collecting your name, address and National Insurance number and those details land at HMRC next year."
Stirling highlighted a common oversight: "Swapping one crypto for another counts as selling it, and with the tax-free allowance sitting at just £3,000, even small profits can mean you owe something."
What Should You Do?
Eamonn Prendergast, Chartered Financial Adviser at Palantir Financial Planning, said: "The rules have been in place for years, but the new reporting regime means HMRC will now have the data to match what’s been declared. The confusion between ‘reported’ and ‘declared’ is where many will get caught out."
Samuel Mather-Holgate, Managing Director at Mather and Murray Financial, noted: "The uncomfortable truth is that one of crypto’s main attractions was anonymity, or at least the belief that activity sat outside the normal financial system. That is now disappearing."
Experts advise anyone who has bought, sold, or swapped crypto to dig out their transaction history, calculate gains or losses, and correct any previous tax returns before HMRC receives the data in 2027. Good record-keeping is now as valuable as good investment returns.
