Skip to main content

Does HMRC Know About My Crypto?

By Bitcoin Tax UK

Published · Updated

Editorial review by Bitcoin Tax UK · Last reviewed

Direct answer

HMRC can obtain information about UK taxpayers’ crypto activity through tax returns, exchange information requests and other reporting channels. Public Bitcoin transactions can also provide evidence, although a wallet address does not itself identify its owner. UK CARF collection began in 2026; the first reports cover that calendar year and are due by 31 May 2027. This does not establish that HMRC already knows every holding or transaction in your account.

Key points

  • HMRC’s ability to obtain information is different from proof that it has received your records.
  • Taxpayer returns and requests for earlier exchange records are separate from CARF.
  • CARF introduces scoped annual reports, rather than live visibility of every portfolio.
  • A public transaction record and an identified wallet owner are different facts.
  • Information reporting does not itself calculate the tax you owe.
On this page

What does HMRC receive from taxpayers?

HMRC already receives crypto information through Self Assessment returns. Its published 2024/25 cryptoasset capital-gains statistics come from the dedicated cryptoasset capital-gains area of those returns. That establishes receipt of declared information, rather than knowledge of every holder’s activity. [HMRC: 2024/25 crypto Self Assessment statistics]

Can HMRC request exchange records?

Yes. HMRC’s guidance describes Schedule 23 notices for relevant third-party data from statutory data-holders. These requests are a distinct channel from annual provider reporting. Information powers have statutory conditions, restrictions and safeguards; they should not be described as unrestricted access to every account worldwide. [HMRC: data gathering CH28110] [HMRC: Schedule 23 request conditions CH28260]

Kraken’s FAQ, updated 12 May 2026, describes an HMRC Schedule 23 notice that may cover individual clients’ information for 2022/23, 2023/24 and 2024/25. Kraken expressly separates that prior-year notice from CARF. The notice is evidence of a specific request, not proof that all exchanges have delivered all customers’ historical transactions. [Kraken: prior years UK reporting FAQ]

Can information from an overseas provider reach HMRC?

Overseas provider reporting can reach HMRC through participating tax authorities and applicable information-exchange arrangements. The route depends on the provider, local rules and the relevant agreements. A country’s commitment to CARF alone does not establish that every bilateral exchange route is operating. [HMRC: information customers provide] [OECD: CARF implementation overview]

The exchange brand is not enough to identify the route. HMRC’s provider guidance considers activities and jurisdictional connections, such as residence, incorporation, management or place of business. Check the company and product in your account terms before treating a general brand policy as a statement about your account. [HMRC: provider reporting scope]

What changes under CARF in 2026 and 2027?

UK CARF collection began on 1 January 2026. The first UK reports cover 1 January to 31 December 2026 and must be submitted between 1 January and 31 May 2027. Calendar-year reporting differs from the UK tax year. Collection during 2026 does not mean that HMRC receives a live feed of every transaction. [HMRC: CRYPTO10410 reporting] [HMRC: reporting user and transaction data]

Current UK guidance includes reportable UK-resident users alongside other reportable jurisdictions. Reports contain specified user details and transaction summaries. CARF’s first reporting period does not automatically make all earlier transactions available; earlier-year information requests are a separate mechanism. [HMRC: reporting user and transaction data] [Finance Act 2026 section 275] [Kraken: prior years UK reporting FAQ]

Can HMRC see a private wallet?

HMRC’s manual explains that Bitcoin transactions are recorded on a public ledger and discusses public transaction and exchange records. Identifying a wallet’s owner is a separate question from seeing its transactions. This distinction does not support either universal identification or a promise of anonymity. [HMRC: Bitcoin public ledger CRYPTO10200] [HMRC: records CRYPTO10400]

HMRC’s CARF manual specifies reporting of outbound transfer totals, including fair market value, units and transaction counts. HMRC’s records guidance separately describes public transaction records and exchange downloads. These sources do not establish visibility of every self-custody balance or describe every blockchain as working like Bitcoin. [HMRC: transfer reporting IEIM8000575] [HMRC: records CRYPTO10400]

Does information reporting mean I owe tax?

No tax calculation follows automatically from a provider report or information request. CARF is an information framework, and personal tax obligations need a separate assessment. Exchange reporting figures should not be assumed to be your UK taxable gains. Use the general UK crypto tax guide for the underlying tax rules. [Kraken: prior years UK reporting FAQ] [Coinbase: CARF and CRS tax reporting] [eToro: automatic tax information exchange FAQ]

What if earlier returns or records are wrong?

HMRC publishes separate guidance on amending Self Assessment returns and telling HMRC about unpaid tax on cryptoassets. The related guides below cover HMRC letters, voluntary disclosure and earlier returns. This visibility page does not prescribe one disclosure route for every case or promise a particular outcome. If the records are incomplete or the position is unclear, you can use the enquiry link to request an introduction. The accountancy firm decides whether to accept the work and agrees its fees with you. [HMRC: correcting Self Assessment returns] [HMRC: telling HMRC about unpaid cryptoasset tax]

This guide is for general information only and does not constitute tax advice.

Tax rules change and individual circumstances vary.

Always consult a qualified tax adviser before making decisions about your tax position.

Nothing on this website creates a professional relationship.

Sources

  1. HMRC: provider reporting scope (external source)
  2. HMRC: reporting user and transaction data (external source)
  3. HMRC: information customers provide (external source)
  4. HMRC: CRYPTO10410 reporting (external source)
  5. HMRC: transfer reporting IEIM8000575 (external source)
  6. HMRC: data gathering CH28110 (external source)
  7. HMRC: Schedule 23 request conditions CH28260 (external source)
  8. HMRC: Bitcoin public ledger CRYPTO10200 (external source)
  9. HMRC: records CRYPTO10400 (external source)
  10. HMRC: 2024/25 crypto Self Assessment statistics (external source)
  11. Finance Act 2026 section 275 (external source)
  12. OECD: CARF implementation overview (external source)
  13. Kraken: prior years UK reporting FAQ (external source)
  14. Coinbase: CARF and CRS tax reporting (external source)
  15. eToro: automatic tax information exchange FAQ (external source)
  16. Gemini: privacy policy (external source)
  17. HMRC: correcting Self Assessment returns (external source)
  18. HMRC: telling HMRC about unpaid cryptoasset tax (external source)

Request an introduction for help with your records or reporting position

Need professional help?

We introduce you to an ICAEW-regulated firm of chartered accountants. Whether the firm takes on your matter is its decision alone.

Start your enquiry

Free to enquire · No obligation.

Frequently asked questions

Does closing an exchange account erase earlier records?

Do not assume it does. HMRC’s records guidance and Gemini’s retention policy illustrate why historical records may remain available. Retention varies by provider; this is not a claim that every provider keeps every record permanently.

Where can I compare named exchanges?

Which Crypto Exchanges Report to HMRC? compares provider policies, specific requests, reporting arrangements and evidence limitations. Use the related question link.