Millions of UK crypto holders are urged to check their tax affairs before tougher reporting rules take effect from 2027, enabling HM Revenue & Customs to spot unpaid tax more easily. The rules themselves are not changing, but enforcement will intensify, including for transactions made several years ago.
What Is Changing?
From 2027, HMRC will receive far more information from UK cryptoasset service providers, giving it a clearer picture of who has bought, sold or swapped digital currencies. Under the UK’s Cryptoasset Reporting Framework, providers have been collecting customer information since January 2026. Between January and May 2027, they will begin sending HMRC details including names, addresses, dates of birth and National Insurance numbers.
Many investors wrongly assumed crypto was invisible to the taxman. That is about to change. According to the Financial Conduct Authority, around 8% of UK adults – roughly 4.5 million people – now own crypto.
Tax Triggers and Liabilities
Selling a coin, swapping one cryptocurrency for another, or being paid in crypto can all trigger a tax charge. This has always been the case. Harvey Dhillon, chief executive at Zmartly, said: “Crypto was never untaxed. It was just unseen, and that is now changing. Selling a coin, swapping one for another or being paid in crypto can trigger capital gains tax (CGT) or income tax bill, and always could.”
With the CGT annual exempt amount slashed to just £3,000, even modest disposals can be chargeable. Dhillon added: “So if you have ever sold or swapped crypto, check your history now, work out the gains for each year, and correct anything missing before the reports land.”
Historic Gains Under Scrutiny
Graham Nicoll, financial planner at NCL Wealth Partners, said many investors who made substantial gains during previous crypto rallies wrongly assume those profits did not need to be declared. “Those historic gains may come under greater scrutiny.” He urged investors to report capital losses as well, which can be offset against future gains on crypto or other assets, potentially reducing tax.
David Stirling, independent financial adviser at Mint Wealth, said many casual investors do not even realise they have created a tax liability. “The rules have not changed but the days of flying under the radar have.” Even swapping one crypto for another counts as selling it. “If that sounds like you, dig out your transaction history and talk to someone before the brown envelopes start arriving. HMRC does not need to prove you did it on purpose, it just needs a number that does not add up.”
Revenue and Penalties
HMRC expects the reporting regime to raise an extra £315 million over four years. Samuel Mather-Holgate, managing director at Mather and Murray Financial, said crypto’s reputation for anonymity is fading fast. “Those caught hardest will be casual holders who bought, swapped, cashed in or received crypto without realising they may have created a tax liability. Get your records together now, don’t wait until HMRC already has the information.”
