From 2026, HMRC’s visibility over crypto transactions is changing significantly.
For years, some crypto investors have assumed that holding Bitcoin, Ethereum or other digital assets through an overseas exchange meant that their transactions were effectively outside HMRC’s field of vision.
That assumption is becoming increasingly dangerous.
From 1 January 2026, the UK has implemented the Crypto-Asset Reporting Framework (CARF) — an international tax transparency regime designed specifically for cryptoassets.
And this matters not only to crypto businesses.
It matters to individuals who are tax resident in the United Kingdom and hold, trade or receive cryptoassets, particularly where their activity involves platforms or service providers operating across different jurisdictions.
What is actually changing?
CARF requires Reporting Cryptoasset Service Providers within participating jurisdictions to collect detailed information about relevant users and their crypto transactions.
The UK rules began applying from 1 January 2026. Information relating to transactions during the 2026 calendar year will be reported, with the UK’s first international exchanges of CARF information taking place in 2027.
Crucially, this is an international information-exchange framework.
HMRC’s own guidance confirms that information on UK-resident crypto users can be provided not only by UK reporting cryptoasset service providers but also by service providers located in other jurisdictions implementing CARF.
In practical terms, the direction of travel is clear:
holding crypto through an overseas platform does not make the underlying activity invisible to HMRC.
And CARF should not be confused with a new crypto tax.
The tax rules already existed.
What is changing is the amount of third-party information available to tax authorities to identify transactions and compare them with taxpayers’ returns.
One of the biggest misunderstandings: “I never cashed out”
This is perhaps the most common issue I see with crypto taxation.
Many investors believe that there is no taxable event until cryptocurrency is converted back into pounds and transferred into a bank account.
That is not how the UK tax rules work.
For an individual investor, a disposal can potentially occur when cryptoassets are sold, exchanged for another cryptoasset, used to purchase goods or services, or given away in certain circumstances.
HMRC specifically treats exchanging one cryptoasset for another as a disposal for Capital Gains Tax purposes.
So, for example:
You bought Bitcoin for £20,000.
It increased in value to £50,000.
You then exchanged the Bitcoin directly for Ethereum.
You received no sterling.
You transferred nothing to your UK bank account.
Nevertheless, for UK tax purposes, you may have made a taxable disposal of the Bitcoin.
The absence of cash does not, by itself, mean the absence of tax.
And it is not only Capital Gains Tax
Depending on the nature of the activity, cryptoassets can also give rise to Income Tax.
For example, tokens received through certain staking, mining or lending activities may constitute taxable income. A subsequent disposal of those tokens can then have separate Capital Gains Tax consequences.
The tax analysis can therefore become significantly more complicated where an investor has:
- used several exchanges;
- moved assets between platforms and wallets;
- undertaken crypto-to-crypto transactions;
- received staking or DeFi rewards;
- acquired the same token at different times and prices;
- traded in different currencies;
- lost access to wallets or exchanges;
- moved between the UK and another country; or
- failed to report transactions in earlier tax years.
Simply looking at the amount of cash transferred into and out of a bank account is often nowhere near enough to establish the correct UK tax position.
“But my exchange is outside the UK”
That fact, by itself, does not resolve the UK tax analysis.
If you are UK tax resident, the location of the exchange should not be confused with the question of whether you have UK tax obligations.
Tax residence, the nature of the transaction, beneficial ownership, the relevant tax year and the character of the income or gain all need to be considered.
And under CARF, international tax authorities are increasingly being given mechanisms through which information concerning crypto users can be exchanged automatically.
This is precisely what CARF was designed to achieve. HMRC states that information received under the framework will be used to tackle tax evasion and avoidance and to help taxpayers meet their obligations.
What if previous crypto transactions were not reported?
This is the area where taxpayers should be particularly careful.
An error does not necessarily mean that someone deliberately avoided tax.
Crypto records can be exceptionally difficult to reconstruct. Investors may have used exchanges that have closed, changed wallets repeatedly, participated in DeFi protocols or completed thousands of transactions without appreciating that individual swaps could have UK tax consequences.
But ignoring the problem is rarely the right strategy.
HMRC already operates a specific facility through which taxpayers can disclose unpaid tax relating to cryptoassets, including income and gains from exchange tokens, NFTs and utility tokens.
Where historic reporting may be incorrect, the sensible approach is therefore to establish the position before HMRC raises the question.
That means reconstructing the transactions, identifying the relevant taxable events, determining the correct UK tax treatment and, where necessary, considering the appropriate route for correcting previous years.
The message for UK crypto investors is simple
2026 marks a major change in crypto tax transparency.
The issue is no longer simply:
“Have I made money from crypto?”
The better questions are:
What taxable transactions have I actually undertaken?
Have they been correctly reported in the UK?
Do my tax returns reconcile with the information that exchanges may ultimately report to tax authorities?
For anyone with material crypto holdings, multiple exchange accounts or historic transactions that have never been reviewed from a UK tax perspective, now is a sensible time to establish the position.
VECTIGALIS TAX | UK & INTERNATIONAL TAX
At Vectigalis Tax, we advise UK-resident individuals on complex UK and international tax matters, including cross-border cryptoasset exposure.
We can review the UK tax treatment of crypto transactions, identify historic reporting issues, analyse transactions involving overseas exchanges and consider the appropriate approach where previous income or gains may not have been correctly declared.
Mail: angelo@vectigalistax.co.uk
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