Can HMRC Track Crypto?

HMRC can track cryptocurrency transactions, and it's easier than ever for HMRC to identify UK crypto investors who haven't reported their crypto.

Here's how HMRC tracks crypto, what information it can access, and what happens if you don't report your crypto taxes.

Does HMRC track crypto?

Yes, HMRC can track cryptocurrency transactions, and it's getting easier for the tax authority to identify UK crypto investors who haven't reported their taxable gains or income under new UK crypto regulations.

Crypto exchanges can share customer and transaction data with HMRC, blockchain analytics can help investigators trace transactions between wallets, and new international reporting rules mean tax authorities will have access to more information about crypto activity than before.

Since 1 January 2026, UK cryptoasset service providers have been required to collect information under the Crypto-Asset Reporting Framework (CARF). They must submit their first reports covering 2026 activity to HMRC by 31 May 2027. So while the new system won't give HMRC an instant record of every transaction, it's another reason not to assume your crypto activity will go unnoticed.

How does HMRC track crypto?

HMRC uses a combination of customer information, transaction records, tax reporting and blockchain analysis to investigate crypto activity.

1. Crypto exchange reporting

Crypto exchanges are one of the most direct ways HMRC can obtain information about investors.

Centralised exchanges generally require customers to provide identifying information when opening an account. They also hold records of transactions carried out on their platforms, including purchases, sales and crypto transfers.

HMRC already has powers to request information from crypto platforms. The introduction of CARF adds a more standardised system for collecting and reporting crypto transaction data.

Under CARF, reporting cryptoasset service providers must carry out customer due diligence and report relevant information about their customers and crypto activity. This includes identifying information, such as names and tax residence details, alongside reportable transaction data.

The rules started applying in the UK on 1 January 2026. Reporting providers must submit their first reports covering the 2026 reporting period between 1 January and 31 May 2027.

This means HMRC will have access to more structured information about crypto activity, making it easier to compare exchange records with tax returns.

2. Blockchain analytics

Public blockchains record transactions on a ledger that anyone can inspect. Although wallet addresses don't normally display the owner's real name, transactions aren't automatically anonymous.

Blockchain analytics tools can track asset movements between addresses, identify patterns, and sometimes link wallet addresses to known exchanges or individuals.

For example, imagine you buy Bitcoin through a centralised exchange, transfer it to a self-custody wallet, and then move it through several other addresses. The transfers may still be visible on the blockchain, even if your name isn't attached to each address.

If investigators can connect one of those addresses to your exchange account or other identifying information, they may be able to build a clearer picture of your activity.

There are limitations. Some transactions are harder to trace than others, and blockchain analysis doesn't automatically establish who controls every wallet or whether a transaction creates a tax liability. But using a private wallet doesn't, by itself, make your transactions invisible.

3. Information requests and investigations

HMRC can obtain information from third parties as part of its compliance work. That can include requesting customer or transaction records from crypto platforms where the relevant legal powers apply.

These powers existed before CARF. The new reporting framework isn't the first time HMRC has been able to obtain crypto data, and it doesn't mean the tax authority was previously unable to investigate crypto investors. For example, HMRC previously requested data from Coinbase.

HMRC can also investigate discrepancies between information it holds and what a taxpayer has reported.

For example, if information suggests you've sold crypto but your tax return doesn't account for the resulting gains, HMRC may ask you to explain the difference and provide supporting records.

4. Self Assessment tax returns

Your tax return is another way HMRC can identify potential reporting issues.

The UK Self Assessment return includes a dedicated section for cryptoasset disposals within the capital gains pages. If you've sold, exchanged or otherwise disposed of crypto, you may need to report the resulting gains or losses, depending on your circumstances and the applicable rules.

HMRC can compare your return with information obtained from exchanges and other sources. If the figures don't match, that may prompt further questions into your crypto taxes.

Remember, buying crypto and holding it generally doesn't trigger capital gains tax on its own, nor does every crypto transaction necessarily create a tax bill. The tax treatment depends on what you've done and the circumstances.

However, if you have taxable gains or income, you can't rely on leaving them off your return simply because you think HMRC won't find out.

Can HMRC track crypto held in a private wallet?

Yes, potentially. A self-custody wallet doesn't automatically make your crypto transactions untraceable. If the wallet uses a public blockchain, transactions can generally be viewed on that blockchain.

The challenge is connecting an address to a real person. HMRC may be able to do this using exchange records, transaction histories, information obtained during an investigation, or other evidence.

For example, if you withdraw ETH from an exchange to your own wallet, the withdrawal may be recorded by the exchange and visible on the blockchain. If you later use that ETH on a decentralised exchange, the on-chain transactions may also be visible.

That doesn't mean every transaction can be attributed to you with certainty. But the combination of exchange records and blockchain analysis can make it possible to investigate activity beyond a centralised platform.

Can HMRC track crypto on international exchanges?

Using an overseas exchange doesn't automatically put your crypto activity beyond HMRC's reach.

CARF is designed to make that sharing information from crypto exchanges between tax authorities easier. As participating countries implement the framework, crypto exchanges will have reporting obligations covering customers who are tax residents in other participating countries.

Does Koinly report to HMRC?

No. Koinly is a third-party crypto tax calculator and portfolio tracker designed to help you stay on the good side of HMRC. Koinly does not share user data, and the existing regulations in the UK that apply to crypto exchanges do not apply to Koinly.

You can connect your exchanges and wallets to Koinly to import your data, free of charge, to check your tax liability. When you’re ready to file, upgrade to a paid plan to generate HMRC crypto tax reports and make reporting easier.