Reporting cryptoasset user and transaction data

IfFrom 1 January 2026 if you provide cryptoasset services in the UK, youyou’ll musthave collectnew responsibilities for collecting data and reportreporting it to HMRC.

This is because ofthe rulesUK calledis introducing the Organisation for Economic Development (OECD) Cryptoasset Reporting Framework (CARF).), and extending it to include domestic reporting.

What youyou’ll need to report

YouYou’ll need to collect details of all of your users, but youyou’ll only need to report on users who are tax resident in the UK or another country that is signed up to CARF rules.

YouYou’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 youyou’ll need to report

YouYou’ll need to submit your first report betweenby 1 January 2027 and 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, weyou may chargebe youcharged a penalty of up to £300 per user.

YouSituations where you could be charged a penalty if:include:

• if you do not report
• if you submit your report late
• if your report is inaccurate, incomplete or unverified

Find out about penalties (International Exchange of Information Manual: IEIM8000600).

More information

You can find detailed information about the Cryptoasset Reporting Framework:

• in the International Exchange of Information technical manual
• in the rules and commentary on the Organisation for Economic Development (OECD)’s website

You can also find out about international tax transparency standards on the OECD’s website.

If you have questions about the Cryptoasset Reporting Framework, you can email eoi.policy@hmrc.gov.uk.