Key Highlights
- UK crypto service providers are mandated to report transaction data for all UK-resident customers.
- This domestic reporting requirement will commence starting January 1, 2026.
- The measure extends the international CARF framework to help HMRC combat tax evasion and avoidance.
The UK’s tax body, His Majesty’s Revenue and Customs (HMRC), has mandated that domestic cryptoasset service providers must begin collecting and reporting the transactions of their UK-resident customers starting in 2026.
Announced on Wednesday, this move is an expansion of regulatory oversight, aligning the UK with broader international efforts to enhance transparency and combat tax non-compliance in the rapidly evolving digital asset sector.
New reporting obligations
The new measure requires UK-based entities classified as Reporting Cryptoasset Service Providers (RCASPs) to collect and report to HMRC each year tax-relevant information concerning their UK-resident clients. This domestic requirement extends the Organization for Economic Co-operation and Development’s international Cryptoasset Reporting Framework (CARF).
Although the CARF aims to enable the cross-border sharing of information between tax jurisdictions, the new domestic obligation means that HMRC will have full, standardized CARF data about all UK taxpayers. This will apply irrespective of whether they operate on a domestic or international crypto platform.
HMRC research, cited in the report, suggests that younger age groups (16-44, at 76% of the crypto population), males (69%), and those of Asian or Asian British ethnic backgrounds (11%) are overrepresented among crypto users. While the measure is tax-neutral, these groups may be disproportionately affected by the increased regulatory scrutiny.
Implementation timeline
The law implementing this change is intended to take effect on and after the date of Royal Assent to Finance Bill 2025-26, and the new rules will begin on January 1, 2026. HMRC will then receive structured annual information for use in its compliance work.
The adoption of the CARF is based on the success of the established Common Reporting Standard (CRS), which deals with the automatic exchange of data on financial accounts between tax authorities of different jurisdictions. However, this scope does not cover crypto asset transactions, potentially leaving an avenue for non-compliance that may undermine the achievements of the CRS.
The OECD developed the CARF, an initiative in which the UK government was an active participant throughout the consultation and agreement process. A domestic consultation concluded in May 2024 on how the CARF should be implemented in the UK.
The proposal that the reporting scope should extend to UK-resident customers, going beyond what the international framework technically requires, was well-received. The government announced in the Autumn Budget 2024 that this approach would be taken forward, laying secondary legislation in June 2025.
Impact on businesses and users
This measure is expected to reduce reporting burdens on RCASPs who are already preparing reports to meet the core international CARF requirements by providing a standardized approach and removing any need for HMRC to exercise existing, possibly less efficient, information powers.
The administrative impact of the regulations on business is expected to be negligible. The roughly 50 affected businesses may incur familiarization costs and expenses associated with updating software to include UK customer data. However, the total cost is relatively low since the substantial IT costs are already being incurred for the international CARF implementation.
For cryptoasset users, the new requirement does not impose any additional tax burden, since the onus for reporting lies wholly with the service providers. HMRC’s policy intent is to use this new structured data to effectively combat tax evasion and avoidance while supporting UK taxpayers in meeting their existing tax obligations.
The first international exchanges of data under CARF are expected to start in 2027.
By extending the reporting requirements of the Cryptoasset Reporting Framework to cover domestic users, the UK government takes a further step in integrating digital assets fully into its tax compliance regime. The implementation will start in January 2026 to ensure that HMRC will have the required comprehensive data set to uphold compliance and transparency in all cryptoasset activities of the taxpayer.
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