Collecting cryptoasset user and transaction data
Find out what information you need to collect under the Cryptoasset Reporting Framework (CARF).
If you provide cryptoasset services in the UK, you must collect certain user and transaction data.
This is because of rules called the Cryptoasset Reporting Framework (CARF).
You can subscribe to get email updates about Cryptoasset Reporting Framework guidance.
Before you start
Check whether you need to report to HMRC.
What to collect
You must collect information about:
- all individual users
- all entity users, which for CARF includes companies, partnerships, trusts and charities
- cryptoasset transactions, for users in the UK and other CARF countries
For individual users
You need to collect their:
- name
- date of birth
- home address
- country of residence
- for UK residents, their National Insurance number or Unique Taxpayer Reference
- for non-UK residents, their tax identification number (TIN) and the country where it was issued
If a user cannot be issued a TIN (for example, because their country does not issue TINs), you do not need to provide one.
For entity users, including companies, partnerships, trusts and charities
You need to collect their:
- legal business name
- main business address
- for UK companies, their company registration number
- for non-UK companies, their tax identification number and the country where it was issued
For some entities, you also need to collect information about their controlling person.
Transactions
For each transaction, you must collect the:
- value
- type of cryptoasset
- type of transaction
- number of units
Find out about transactions (International Exchange of Information Manual: IEIM8000500).
Due diligence
You need to verify that the information you collect is accurate by carrying out due diligence.
Find out about due diligence requirements (International Exchange of Information Manual: IEIM8000400).
Reporting to HMRC
Depending on the information you collect, you may need to submit a report to HMRC each year. Find out what you need to report to HMRC.
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) 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.
Updates to this page
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Added links to the International Exchange of Information manual for when you need to report on the controlling person of an entity, transactions and due diligence requirements.
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Added link to new Cryptoasset Reporting Framework chapter of International Exchange of Information technical manual.
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Updated HMRC contact details.
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First published.