Reporting cryptoasset user and transaction data
Find out when and how you'll need to report to HMRC under the Cryptoasset Reporting Framework (CARF).
From 1 January 2026 if you provide cryptoasset services in the UK, you’ll have new responsibilities for collecting data and reporting it to HMRC.
This is because the UK is introducing the Organisation for Economic Development (OECD) Cryptoasset Reporting Framework (CARF), and extending it to include domestic reporting.
We’ll be updating this guidance with more information in due course.
You can subscribe to get emails about updates to CARF guidance.
What you’ll need to report
You’ll need to collect details of all of your users, but you’ll only need to report on users who are tax resident in the UK or another country that is signed up to CARF rules.
You’ll need to report these users’ details and a summary of their transactions.
If you have no information to report in a year, you do not need to submit a report.
When you’ll need to report
You’ll need to submit your first report by 31 May 2027, giving details for 1 January 2026 to 31 December 2026.
In future years you’ll also need to submit a report by 31 May, giving details for the previous calendar year.
How you’ll need to report
You’ll need to submit your report on our online service. It is not live yet — we’ll update the guidance when it is.
Your report will need to be submitted in an XML schema. You can find guidance on creating an XML schema on the OECD website.
Penalties
If you do not follow the rules, you may be charged a penalty of up to £300 per user.
Situations where you could be charged a penalty include:
- if you do not report
- if you submit your report late
- if your report is inaccurate, incomplete or unverified
If you need support
If you have questions about reporting, you can contact the Automatic Exchange of Information (AEOI) helpline.