If you’ve traded cryptoassets for a profit, you might assume that any gains you make are tax-free. However, this is not the case.
Cryptoasset gains are not tax-free in the UK. HMRC treats most crypto transactions as taxable, typically under Capital Gains Tax or Income Tax, depending on the activity, and is actively identifying individuals who have not declared gains.
With HMRC issuing ‘nudge’ letters to people who have traded crypto, Kerry Newman, Head of SG Accounting explains how such assets are treated for tax purposes.
HMRC’s stance has appeared to change over time
In 2014, HMRC’s initial guidance on cryptoassets (such as Bitcoin) suggested that any gains from transactions might be treated similarly to gambling.
This led many to believe that crypto trading gains were tax-exempt. However, as cryptoassets gained mainstream traction, HMRC refined its position.
HMRC now explicitly states that buying and selling cryptoassets, such as Bitcoin, is not analogous to gambling. As a result, any gains you make are taxable and typically subject to Capital Gains Tax (CGT).
How are profits taxed?
In short, cryptoassets are taxable. Although financial institutions may not recognise them as legal tender, HMRC treats cryptoassets similarly to shares.
This means they are subject to Capital Gains Tax and/or Income Tax, depending on the nature of the transaction.
The type of tax you need to pay depends on your specific crypto activity.
For capital gains exceeding the 2025/26 £3,000 annual exempt amount, you’ll incur a 10% or 20% tax rate, depending on your income level.
If your proceeds exceed £50,000, but your gains are below the annual exempt amount, you must still report your disposal to HMRC via Self Assessment.
Additional income from crypto, such as trading profits or staking income, may be taxed between 20% and 45%, depending on your Income Tax band.
If you make losses on crypto investments, it is worth reporting them to HMRC so they can be offset against future gains.
HMRC can track cryptoassets
HMRC has developed robust capabilities to monitor cryptoasset transactions. Using data from exchanges such as Crypto.com, HMRC can track activity and identify individuals who may not have declared gains.
HMRC can also access transaction data dating back several years through data-sharing agreements with crypto exchanges. They also have access to information collected from users during sign-up and registration processes, in accordance with ‘Know Your Customer’ (KYC) rules.
New rules came into effect requiring crypto platforms to collect customer data and report it to HMRC, increasing transparency across the sector.
Over the past two years, HMRC has issued ‘nudge’ letters to taxpayers who might owe tax on their crypto activities based on this data.
HMRC ‘nudge’ letters
HMRC issues ‘nudge’ letters when it suspects undisclosed profits from cryptocurrency investments. Following several years of data collection from cryptocurrency exchanges, 8,329 such letters have been issued.
Many cryptocurrency owners may be unaware that they owe Capital Gains Tax on selling digital assets. In some cases, individuals may instead be classified as traders, in which case Income Tax may apply.
Tax obligations may also arise from cryptocurrency mining, staking rewards, airdrops, or frequent trading activity.
According to the FCA, an estimated 4.97 million UK residents owned cryptocurrency as of 2022, which helps explain HMRC’s increased focus on this area.
What do these letters say?
These letters typically indicate that the recipient either currently holds or has held cryptoassets. They highlight scenarios that may result in a taxable gain:
- Trading cryptocurrency for profit
- Exchanging one form of cryptocurrency for another
- Purchasing goods or services using cryptocurrency
Points 2 and 3 are particularly important because HMRC treats these transactions as disposals for Capital Gains Tax purposes.
HMRC’s future plans
HMRC’s campaign against undeclared cryptocurrency tax is expected to intensify, with nudge letters potentially followed by formal enquiries. As HMRC gains greater access to data, avoiding scrutiny will become increasingly difficult.
Always seek professional advice
For obvious reasons, you should seek professional advice if you have made gains from cryptoasset dealings. A specialist accountant can help you understand your tax position and ensure you remain compliant with HMRC rules.
For a broader overview of how tax works for contractors and company owners, see our guide to Self Assessment and reporting income.
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