Which Crypto Exchanges Report to HMRC? (UK, 2025/26)

If you're worried HMRC might already know about your crypto, here's the honest answer up front: yes, assume it can see your activity, but that's manageable as long as what you report is accurate. Most people ask "which crypto exchanges report to HMRC?" hoping for a list, so they can work out whether their own exchange is one HMRC hears from. It's the wrong question to plan around, and chasing a per-exchange list only gives you false comfort. The UK is moving to a regime where the framework, not any single exchange, is what matters: a broad set of crypto firms will routinely report user and transaction data, and information also flows between countries.

This guide explains the rules that actually apply in the UK for the 2025/26 tax year, chiefly the Crypto-Asset Reporting Framework (CARF): what data gets collected, when, and who sees it. The practical conclusion is calm and simple. Assume HMRC can see your activity, and make sure what you report on your Self Assessment matches reality. If you want to get your numbers right first, our free calculator and our SA108 crypto boxes guide walk through the reporting side.

What is the Crypto-Asset Reporting Framework (CARF)?

CARF is an OECD-designed information-reporting standard that the UK is implementing. In plain terms, it requires UK-based crypto firms (HMRC calls them "reporting cryptoasset service providers", or RCASPs, broadly exchanges, brokers and dealers that transact crypto for users or let users transact) to collect information about their users and those users' transactions, and report it to HMRC each year.

It is the crypto equivalent of the bank-account reporting that has existed for years under the Common Reporting Standard. The aim is straightforward: give tax authorities visibility of crypto activity so the right tax gets paid. HMRC has estimated around 50 providers are in scope at the start, but the framework is about the rules, not a fixed roster, so treating it as "only the big exchanges report" would be a mistake.

When does CARF start and when does HMRC get the data?

The measure comes into effect on 1 January 2026, which is when in-scope UK crypto firms must start collecting the required user and transaction data. The first reporting period runs across the 2026 calendar year (1 January to 31 December 2026), and firms submit their first report to HMRC between 1 January and 31 May 2027.

Firms also have to register with HMRC's online service by 31 January 2027 and tell their users that they will be reporting their details. So even before the first report lands, you may receive a notice from your exchange explaining what it will share. The table below sets out the key dates.

What information will be reported about me?

CARF reporting is about identity plus activity. Firms collect details to identify you (such as your name, address, date of birth and a tax identification number, which for a UK resident is typically your National Insurance number or Unique Taxpayer Reference), and a summary of your transactions over the year. That summary covers things like crypto-to-fiat and crypto-to-crypto exchanges, transfers, and the value involved.

An important nuance on scope: firms collect details on all of their users, but they only report users who are tax resident in the UK or in another country that has signed up to CARF. If you are UK-resident, your data goes to HMRC. If you use an overseas exchange that is itself in a CARF jurisdiction, that exchange reports you to its own authority, which then exchanges the information with HMRC. Either way, the realistic planning assumption is the same.

So which exchanges actually report to HMRC?

We are deliberately not publishing a per-exchange "reports / doesn't report" list, because any such list would be unreliable and would change as more firms come into scope, and because relying on it could lead you to under-report. The accurate framing is by category, not brand:

The bottom line is that the question "does my exchange report?" is the wrong thing to optimise. Even where an exchange is outside CARF today, HMRC has other routes to information (international agreements, data requests, and the records you yourself hold), and the framework is widening, not shrinking. Plan as though your activity is visible.

• UK-based exchanges and brokers are squarely in scope as RCASPs and report UK users' data directly to HMRC.
• Overseas exchanges in a CARF country report their users to their local authority, which then shares UK residents' data with HMRC under international exchange.
• Exchanges outside any CARF jurisdiction may not report automatically, but that does not make the underlying activity invisible or the tax optional, and HMRC can still obtain information by other means.
• Your own wallets and on-chain activity are not "reported" by a firm, but blockchains are public and you are still legally responsible for reporting any taxable disposals.

What should I actually do about it?

Treat CARF as a prompt to get your reporting right, not a reason to panic. In the UK you must report your gains on Self Assessment if your total gains for the year are more than the £3,000 annual exempt amount (2025/26), or if your total disposal proceeds exceed £50,000, even if no tax is due. Crypto goes in the cryptoassets section of the SA108 Capital Gains Summary (boxes 13.1–13.8). For the 2025/26 year you register by 5 October 2026 and file and pay online by 31 January 2027.

Getting the figures right means matching disposals to cost using HMRC's rules: same-day, then the 30-day "bed and breakfasting" rule, then the Section 104 pool running average. Income-type events (staking, mining, most airdrops) are valued in GBP on the day received and taxed as income, with that value becoming your cost basis for a later disposal. Our guides on crypto tax rates and the Section 104 pool cover the mechanics; the methodology page shows exactly how our calculator does it.

If you think you under-reported in earlier years, HMRC has a dedicated route to tell them about unpaid tax on cryptoassets. Coming forward voluntarily generally reduces penalties compared with HMRC contacting you first. If you make a disclosure, note that you normally have to pay what you owe within 30 days of submitting it. And if a nudge letter has already arrived, here is exactly what to do with an HMRC crypto nudge letter. If you are still getting your bearings, the complete UK crypto tax guide walks through how everything fits together.

The one-line takeaway

You do not need a list of which exchanges report to HMRC. Under CARF, UK firms collect your data from 1 January 2026 and report it from 2027, and overseas data is exchanged internationally. Assume HMRC can see your crypto activity, and report it accurately on your Self Assessment. Do that, and the question of "who reports" stops mattering, because your return already tells the true story.

Sources

• GOV.UK: Check if you'll need to report cryptoasset data to HMRC
• GOV.UK: Implementation of the Cryptoasset Reporting Framework (CARF)
• GOV.UK: Collecting cryptoasset user and transaction data
• GOV.UK: Reporting cryptoasset user and transaction data
• GOV.UK: Check if you need to pay tax when you sell cryptoassets
• GOV.UK: Tell HMRC about unpaid tax on cryptoassets
• HMRC Cryptoassets Manual, CRYPTO22000 (Capital Gains Tax)