Can HMRC Track Your Crypto in 2026?

HMRC's view into crypto has widened every year, and from 2026 the regulated platforms you trade on report your activity directly.

I'm Chris Herbst, Managing Director at CountDeFi, a crypto tax reporting firm, and a GTP-designated tax practitioner and CIBA member focused on cross-border crypto tax. Since 2017, our team has worked with UK investors across the full range from portfolios deep in DeFi to multi-year histories that have to be rebuilt before a disclosure can be filed. I've written this for UK holders who aren't sure how much HMRC can see, or whether their past returns are clean. This guide covers what data HMRC can access, how it tracks crypto, and what to do if your earlier years have gaps.

Does HMRC Know About Your Crypto?

Yes, HMRC can track your crypto activity though a stack of channels including crypto exchanges reporting your data directly to HMRC. HMRC issued its first guidance on cryptoasset taxation in 2014 and has been building its enforcement capability since. The tools and powers available to HMRC in 2026 are materially different to what existed even three years ago.

For our UK CountDeFi clients, in 2026, the question is not whether HMRC can see your crypto. It is how much detail they now have, and how they will use it.

Read this first: If you're in any doubt about how the UK approaches  crypto tax, start with my UK Crypto Tax Guide. It's updated and references the latest HMRC guidance.

How HMRC Tracks Crypto Activity

HMRC uses several methods to identify crypto investors and access transaction data.

CARF reporting

From 1 January 2026, UK crypto platforms must begin collecting CARF reporting data, including customer identity, tax residence information, and reportable crypto transactions. The first CARF reports are due to HMRC by 31 May 2027. Like the US 1099-DA regime, CARF provides HMRC with third-party data that can be matched against tax returns.

For the full detail on how CARF works and what it collects, see our CARF guide.

Blockchain analytics

HMRC has procured specialist blockchain analytics capability to trace on-chain activity. These tools can link wallet addresses to individuals, track flows across chains, and identify patterns that suggest undisclosed trading. If you have used a decentralised exchange or a non-custodial wallet, HMRC may still be able to connect that activity to you, particularly if funds moved through a regulated exchange at any point.

Self Assessment data matching

Starting with the 2024/25 tax year, HMRC introduced a dedicated cryptoasset section to the Self Assessment capital gains pages. Investors who disposed of cryptoassets are required to declare that activity. Failing to do so is a false declaration. Reporting figures that do not match what platforms submit under CARF creates a discrepancy HMRC can identify.

Exchange information notices

HMRC has the power to issue formal information notices requiring UK-regulated exchanges to hand over customer data. This power has been used against platforms serving UK customers. If you have traded on a regulated exchange, your account details and transaction history are within HMRC's reach under existing powers, regardless of CARF.

Which Crypto Exchanges Report to HRMC

Many crypto exchanges serving UK customers are now subject to CARF reporting obligations or existing HMRC information requests. Whether a platform reports under CARF depends on its activities, customer base, and reporting obligations under the framework. Most centralized cryptocurrency exchanges operating or based in the UK, such as Coinbase, Binance, Kraken, and Gemini, report data to HMRC

On a page addressing exchanges and the like, HMRC says: If you provide cryptoasset services in the UK, you must collect data and report it to HMRC.This is because of rules called the Cryptoasset Reporting Framework (CARF). Find out more about CARF rules (International Exchange of Information Manual: IEIM8000020).

So if you're wondering whether your exchange may report information to HMRC, the answer is increasingly yes. From 2026, many exchanges serving UK customers are required to collect and report customer information and transaction data under the Cryptoasset Reporting Framework.

Does Coinbase report to HMRC?

Yes. Coinbase has cooperated with HMRC for years, and previously shared customer data under earlier information-sharing arrangements when account holders crossed certain thresholds. Under CARF, that becomes systematic: from January 2026 Coinbase collects your identity, tax residence, and the GBP value of every transaction, with the first report due to HMRC by 31 May 2027. If you have ever held a Coinbase UK account, assume HMRC can see it.

Does Binance report to HMRC?

Yes. Binance operates under UK reporting obligations and is within CARF scope, so your trades, transfers, and identity details are collected and reported to HMRC. Binance has also historically provided user data to tax authorities on request, so the idea that a large international exchange sits outside HMRC's reach no longer holds. Activity moved off Binance to a private wallet does not erase the record Binance already holds.

Does Kraken report to HMRC?

Yes. Kraken is a regulated exchange within scope of the UK rules and reports UK user activity, including transaction type, asset, and value, to HMRC under CARF. Kraken has also been subject to data demands from tax authorities in other jurisdictions, which is a useful reminder that exchange cooperation with revenue services is now the norm, not the exception.

Does Gemini report to HMRC?

Yes. Gemini collects and reports UK customer and transaction data to HMRC under the same framework. As a platform that has positioned itself around regulatory compliance, Gemini is among the most likely to report fully and on time, which means activity on it is among the most visible to HMRC.

Can HMRC Track Crypto on Offshore Exchanges?

Yes, and this is where people most often misjudge their exposure. Moving to a foreign platform feels like stepping outside HMRC's reach. It rarely is.

CARF is a global framework. Dozens of jurisdictions have committed to implementing CARF, including the UK, EU member states, Australia, Canada, and Singapore. Where an exchange sits in a participating country, that country shares the data with HMRC. An offshore account is only "offshore" until its jurisdiction starts reporting, and most major ones now do.

The exchange isn't the only trail. The moment offshore funds touch the UK system, a bank transfer, a cash-out, a purchase on a UK statement, you create a record HMRC can follow back. And penalties run higher when an offshore element is involved.

How far back can HRMC track your crypto

Further than most people assume. HMRC's assessment window depends on why the return was wrong:

CARF gives HMRC stronger oversight of crypto activity from 2026 onwards, but that does not mean HMRC was blind to earlier years. HMRC's existing powers, information notices, blockchain analytics, and third-party data, have always reached back. And since the dedicated crypto section landed on Self Assessment returns in 2024/25, HMRC has a clear basis to spot anyone who disposed of cryptoassets and didn't declare it.

So if your 2022, 2023, or 2024/25 returns have gaps, the arrival of CARF data in 2027 gives HMRC every reason to look backwards. The absence of CARF in those years protects nothing.

Take a hypothetical. James sells £30,000 of ETH in 2022, assumes nobody is watching, and leaves it off his return. He carries on trading. In 2027, CARF data for his 2026 activity reaches HMRC and flags him as an active crypto investor, which prompts a look at his earlier years. The 2022 disposal surfaces. Because HMRC treats the omission as careless, the 6-year window is wide open, and a gain James once valued at a few thousand in tax now carries back tax, interest accrued since 2022, and a penalty on top. Had he corrected it before HMRC came looking, the same disposal would have cost him a fraction.

What Are the Penalties for Unreported Crypto Gains?

What happens if you don't declare your crypto to HMRC? HMRC's penalty regime for undeclared crypto gains depends on whether the failure was careless, deliberate, or involved concealment.

Unprompted disclosure (you come forward voluntarily)

• Careless error: 0% to 30% of the tax owed
• Deliberate but not concealed: 20% to 70%
• Deliberate and concealed: 30% to 100%

Prompted disclosure (HMRC contacts you first)

• Careless error: 15% to 30% of the tax owed
• Deliberate but not concealed: 35% to 70%
• Deliberate and concealed: 50% to 100%

Interest accrues on unpaid tax from the original due date. In serious cases, HMRC can pursue criminal prosecution, though this is reserved for the most egregious cases of deliberate evasion.

The gap between unprompted and prompted penalties is significant. Coming forward before HMRC contacts you materially reduces what you owe.

What Is the HMRC Cryptoasset Disclosure Service?

If you have unreported crypto gains from earlier years, HMRC's Cryptoasset Disclosure Service (CDS) is the formal route to put them right, before HMRC opens an enquiry of its own.

Coming forward through the CDS can cut your penalty substantially against the cost of waiting to be caught. But it isn't automatically the best route for every situation, and the way you build the disclosure matters: which years you include, how you present the figures, and how you characterise the error all move the penalty outcome.

That is why this is worth getting right the first time. A disclosure structured well can land at the bottom of the penalty range. One structured badly can cost you far more than it needed to, or invite the scrutiny it was meant to close off. Get advice before you submit. Our HMRC Crypto Disclosure Guide covers how it works.

UK Crypto Tracking - What Should You Do Now?

If your crypto tax position is clean and your records are complete, HRMC's awareness of your trading is not a threat. Carry on, as they say. But if you have gaps, errors, or years where you did not file, the right move is to act before HMRC acts first. That means:

1. Understanding the basics of how HMRC treats crypto - Our Crypto Tax UK Guide is a great starting point
2. Getting a full picture of your transaction history across all wallets and exchanges
3. Calculating your gains, losses, and income for each affected year using share pooling
4. Determining whether you need to amend prior returns or make a voluntary disclosure
5. Deciding how to approach HMRC

CountDeFi works with UK investors at every stage of this process. We reconstruct transaction histories, calculate the correct tax position for each year, and work alongside tax advisers on disclosure strategies where needed. If you are not sure where you stand, a conversation costs nothing. Book a free call with our UK team.