CARF · HMRC
CARF reporting in the United Kingdom
The UK has adopted the OECD's Crypto-Asset Reporting Framework as its own set of rules for cryptoasset service providers. DAC8 does not apply here; that is the EU's law, and the UK writes CARF into its own law and reports to HMRC. Data collection started on 1 January 2026, and your first report is due by 31 May 2027. Kryptos does the due diligence, builds the file HMRC accepts, and files it.
AT A GLANCE
HMRC
Authority
31 May 2027
First report
CARF, UK version
Rules
UK and overseas users
Reports on
Who has to report
A cryptoasset service provider with a UK link reports to HMRC. That link usually means you are UK-resident, incorporated here, managed from here, or run a UK branch. Most providers have that link in one country, so you register and report in one place rather than in every country your users live in.
The dates that matter
Collection started on 1 January 2026. You register with HMRC during 2026, your first report covers the 2026 year, and it is due by 31 May 2027. The report is only as good as the data you collect this year, so the real work is happening now, not in 2027.
The UK reports its own residents too
Under most CARF rules you report users who live abroad, and their data is passed to their home country. The UK also asks you to report users who are UK tax resident, straight to HMRC. So a UK provider files on both its overseas and its UK users in the same report.
What happens if you get it wrong
HMRC can charge penalties for late reports, missing details, wrong figures, and for not applying the due-diligence rules. The amounts follow HMRC's normal penalty structure. The way to avoid them is clean self-certification and checked tax IDs from the start, not a rush before the deadline.
ONE PLATFORM
How Kryptos handles it
It runs on one system. You send your own transaction and account data, Kryptos collects self-certifications and checks tax IDs at onboarding, works out gains on the right basis, and builds the exact file the authority accepts, checked against the schema before you submit.
FAQ
Common questions
Does DAC8 apply in the UK?
No. DAC8 is the EU's law, and the UK is not in the EU. The UK adopts the same OECD standard, CARF, through its own rules and reports to HMRC.
When is the first UK CARF report due?
By 31 May 2027, to HMRC, covering data from 2026. Registration and due diligence run through 2026 so the report is ready in time.
Does the UK CARF regime cover UK-resident users?
Yes. As well as reporting overseas users for exchange with their home country, the UK asks providers to report UK-resident users to HMRC, so both are filed together.
MORE ON CARF
Guides and analysis
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