In most cases, HMRC already knows about your crypto, or soon will. Since 1 January 2026, UK crypto platforms must collect your details under the Crypto-Asset Reporting Framework (CARF) and send HMRC your transactions every year. HMRC also receives data from exchanges directly and uses blockchain analytics, so assuming your crypto is invisible is risky. If you have ever typed “does HMRC know about my crypto” into Google late at night, you are far from alone. It is the question our team hears more than any other. Malik Ali FCCA, who leads Crypto Accountants, puts it simply: for most UK investors, the real question is no longer whether HMRC can see your crypto, but how much it already has on file.
How Does HMRC Get Your Crypto Information?
A few years ago, the honest answer to “does HMRC know about my crypto” was “sometimes”. In 2026, the answer is “increasingly, yes”, and there are three main reasons.
The Crypto-Asset Reporting Framework (CARF)
The biggest change is the Crypto-Asset Reporting Framework, or CARF, which the UK brought into force on 1 January 2026. Under CARF, crypto exchanges, brokers and some wallet providers must collect details about their UK users and report their transactions to HMRC every year. The first reports, covering the 2026 calendar year, are due by 31 May 2027. We cover the rules in depth in our guide to CARF UK crypto reporting.
What Information Crypto Platforms Send to HMRC
The information platforms send includes your name, address, date of birth, tax residence, and National Insurance number, along with the value of what you bought, sold, swapped, and transferred during the year.
That is why so many investors have received an inquiry for their NI number.
If you refuse to hand it over, you can face a penalty, and the platform may restrict your account.
Exchange Data, Nudge Letters and HMRC Connect
CARF is not HMRC’s first source of crypto data, though. Since 2019, HMRC has used its information powers to request customer records from UK exchanges, and it has used that data to send tens of thousands of “nudge letters” to people it believes have undeclared gains. All of this feeds into Connect, HMRC’s data analytics system, which cross-checks exchange data against bank records, tax returns, property records and other sources to spot people whose transactions do not fit what they have declared.
Blockchain Analytics
Finally, most blockchains are public. That matters more to the question of whether HMRC knows about my crypto than most people realise.
Specialist analytics firms can trace funds from wallet to wallet, and HMRC has used these tools for years. Once HMRC links a single address to you, it can follow a great deal of your history.
Can HMRC see my Coinbase account?
In practical terms, yes. Coinbase operates in the UK as a registered business, verifies every customer’s identity, and falls within CARF. From 1 January 2026 onwards, Coinbase will therefore report your activity to HMRC with your personal details attached.
Coinbase has also supplied customer data to HMRC in the past. So your activity before 2026 may not stay hidden either.
If you have been asking “can HMRC see my Coinbase account”, the safest assumption is yes. HMRC will check your gains against your Self Assessment return.
Can HMRC see my Binance account?
Binance’s position in the UK has changed several times. It is not registered with the FCA, so it does not sit inside the UK regime in the same way Coinbase does.
However, CARF is an international standard. Dozens of countries have committed to it, and they will exchange data with each other.
That means a platform based abroad reports on its UK customers to its own tax authority. It then passes the information to HMRC. Money moving between your UK bank and Binance is also visible to HMRC through your bank records.
Can HMRC track my crypto wallet?
A self-custody wallet such as a Ledger or MetaMask does not report to anyone. HMRC does not receive an annual statement from your hardware wallet. That does not make it invisible.
Under CARF, exchanges must report transfers you make out to external wallets. Once HMRC knows an address belongs to you, the public blockchain shows everything that came in and went out.
So can HMRC track my crypto wallet? Not automatically, but usually yes once your money has passed through a regulated platform at either end.
What happens if HMRC’s data does not match your tax return
From 2027, HMRC will hold a clear list of UK residents with crypto activity. Gaps between that data and tax returns will be easy to spot.
If your figures do not line up, you might receive a nudge letter asking you to check your return. HMRC may open a formal compliance check.
Penalties depend largely on behaviour. Genuine mistakes where you took reasonable care may carry no penalty at all, while careless or deliberate errors cost more. Crucially, penalties are much lower when you come forward before HMRC contacts you.
According to the Compliance Handbook, HMRC can look back 4 years for innocent errors, 6 years for careless ones and up to 20 years where it considers the behaviour deliberate. If you owe tax from earlier years, HMRC’s Cryptoasset Disclosure Service lets you put things right on your own terms.
What to Do If HMRC know about my crypto?
Whatever the precise answer for your situation, the sensible approach is to act as if HMRC knows everything, because by 2027 it largely will.
For the 2026/27 tax year, which runs from 6 April 2026 to 5 April 2027, that means keeping a full record of every buy, sell, swap and transfer. It means working out your gains in pounds sterling using HMRC’s pooling rules, and reporting them on your Self Assessment return if they exceed the £3,000 annual exempt amount or your total disposal proceeds exceed £50,000. Remember that swapping one token for another counts as a disposal, not only cashing out to pounds.
If you are still asking yourself Does HMRC know about my crypto, you are probably worried about something from the past.
Malik Ali FCCA and the Crypto Accountants team deal with this every week, from tidying up years of exchange exports to making a voluntary disclosure before a letter arrives.
Speaking to a specialist now is almost always cheaper than waiting.
People Also Ask
Can HMRC find out about my crypto?
Yes. HMRC receives your details and transactions from crypto platforms under CARF from 2026, has collected UK exchange data since 2019, swaps information with overseas tax authorities and uses blockchain analytics. For most people, it is no longer a question of whether HMRC knows, but how much.
Will HMRC know if I use a decentralised exchange?
Not directly, because decentralised exchanges such as Uniswap do not verify identities or report to HMRC. However, most people fund DeFi activity from a regulated exchange and cash out the same way, and those platforms report transfers under CARF. Because blockchains are public, trades on a decentralised exchange can often be traced back to you, and they remain taxable.
