HMRC has warned UK taxpayers who own crypto-assets that they must provide their personal details to every crypto-asset service provider they use from January 2026 or risk penalties of up to GBP300.

The new rules are enabled by international cooperation under the OECD's Crypto-asset Reporting Framework (CARF) and are estimated to raise tax revenue of up to GBP315 million by April 2030. Crypto-users should already be including any crypto gains or income in their self-assessment tax returns.

On 24 June 2025, regulations were made requiring reporting crypto-asset service providers to collect and report information on crypto-asset users who are resident in the UK or in another jurisdiction that is signed up to CARF. From 1 January 2026, service providers must collect such customers' name, address, date of birth, tax residence, national insurance number or tax reference and a summary of their crypto transactions. These details must be reported to HMRC. Any service provider that fails to report this information, or submits inaccurate or incomplete reports, could also be charged a penalty of up to GBP300 per user.