Crypto and UK Tax: What to Watch, What to Report, and How to Stay Compliant

Recently, we have seen an increase in enquiries about cryptocurrency and how it is taxed in the UK. Many questions relate to Capital Gains Tax, particularly from people who have held crypto for some time and are now expecting to realise a significant gain or loss. Others are looking for support with HMRC enquiries. 

HMRC has taken a clear approach to cryptocurrency, but the rules can still feel complex when it comes to reporting and paying tax. The position is often more complicated than it first appears, especially where crypto has been traded over several years or across multiple exchanges or accounts.

With this in mind, in this month’s article, we break down how cryptocurrency is taxed, when it needs to be reported, and share some practical tips to help reduce unnecessary stress.

When does tax apply to cryptocurrency?

HMRC does not treat cryptocurrency as money or legal tender. Instead, it is generally taxed as an asset, with the outcome depending on how it is acquired and used.

• Capital Gains Tax (CGT): In most cases, individuals will be subject to CGT when they “dispose” of cryptocurrency. A disposal includes selling cryptocurrency for Sterling, exchanging one cryptocurrency for another, using cryptocurrency to pay for goods or services, or gifting it to someone other than a spouse or civil partner.
• Income Tax: This may apply where cryptocurrency is received as income. Common examples include staking rewards, mining income, airdrops received in return for services, or cryptocurrency paid as part of employment or self-employed work. In these situations, tax is based on the Sterling value at the time the cryptocurrency is received, regardless of whether it is later sold.
• Trading: Where activity is frequent or highly organised, HMRC may consider whether it amounts to financial trading, which changes how profits are taxed. Each case depends on the specific facts of the activity.

What makes a cryptocurrency transaction taxable?

The key point to remember is that tax is triggered by activity, not ownership alone.

For Capital Gains Tax purposes, HMRC looks at the difference between the acquisition cost of the cryptocurrency and its value at the point of disposal. This requires accurate records of transaction dates, values in Sterling, and any associated costs, such as exchange or platform fees.

HMRC applies specific “pooling” rules to cryptocurrency, similar to those used for shares. This can produce unexpected results where assets have been acquired at different times and prices, particularly if records are incomplete. For Income Tax, the focus is on why and when the cryptocurrency was received. Even if the cryptocurrency is retained or reinvested rather than converted into cash, a tax liability may have already arisen.

When and how should cryptocurrency be reported?

Cryptocurrency income and gains are reported through the Self Assessment tax return. However, the level of transparency has increased significantly for the current 2025/26 tax year.

• Dedicated Reporting Section: Since the 2024/25 tax year, HMRC has utilised a specific, dedicated section for cryptoassets on the Capital Gains summary pages (SA108). You are required to declare crypto transactions separately from other assets like shares or property.
• The CARF Era (New for 2026): As of 1 January 2026, the Crypto-Asset Reporting Framework (CARF) is officially live in the UK. Crypto platforms and exchanges are now legally mandated to collect and report transaction data, National Insurance numbers, and wallet addresses directly to HMRC. While collection began in January 2026, the first formal data exchange with HMRC is scheduled to be completed by 31 May 2027.
• Current Tax Rates: For disposals made in the 2025/26 tax year, the Capital Gains Tax rates are 18% for basic-rate taxpayers and 24% for higher-rate taxpayers. The Annual Exempt Amount (your tax-free allowance) remains at £3,000.
• Deadlines & Disclosure: With the 31 January deadline for the 2024/25 year having passed, any newly discovered errors or late filings should be handled via HMRC’s Digital Disclosure Service. Proactive, “unprompted” disclosure typically results in significantly lower penalties than waiting for HMRC to send a “nudge letter” based on the data they are now receiving from exchanges.

Practical checks and common pitfalls

Incomplete records remain the most common issue. Using multiple wallets, transferring cryptocurrency between platforms, or trading over several years can quickly make calculations difficult if information is missing.

Another frequent misunderstanding is the belief that exchanging one cryptocurrency for another does not create a tax charge. In the UK, such exchanges are treated as disposals and acquisitions, even where no Sterling is involved.

Losses are often overlooked. Where cryptocurrency has fallen in value and been disposed of, capital losses may be available to offset against other gains, provided they are correctly reported.

Timing is also important. The UK tax year runs from 6 April to 5 April, and transactions close to the year-end can affect when tax becomes payable.

How can we help

Cryptocurrency taxation does not need to be overwhelming, but it does require careful handling. We regularly assist clients with reviewing historical activity, preparing accurate calculations, correcting past filings, and liaising with HMRC where needed.

If you hold cryptocurrency and are unsure of your tax position, or would simply like reassurance that everything has been reported correctly, we would be pleased to help. Early advice often prevents issues from escalating and provides clarity where matters feel uncertain. Please do get in touch if you would like to discuss this further.