We are increasingly approached by people who have traded between tokens for several years but never withdrawn money to a UK bank account. Many assume that no tax arises until cryptocurrency is converted into pounds. That is not how the UK rules work.
HMRC has confirmed that it may contact people who have traded cryptoassets by letter, email or text message. The contact may ask them to check whether their crypto income and gains have been declared correctly. This makes it important to review potential tax liabilities from cryptoassets before replying or submitting another tax return.
Cryptoassets are digital representations of value whose transactions are secured and validated using distributed ledger technology or similar cryptographic systems. They include exchange tokens such as bitcoin, utility tokens, security tokens, stablecoins and non-fungible tokens.
HMRC does not generally treat cryptoassets as money or currency. Their tax treatment depends on the nature of the asset, how it was acquired and what the owner did with it. A token received as payment for work can therefore have a different treatment from the same token bought as an investment.
This distinction is central to Cryptoassets and tax because a transaction may fall under:
For most individuals buying tokens as investments, HMRC expects gains and losses to fall within the Capital Gains Tax rules rather than being treated as trading profits. The position may differ where the frequency, organisation, commercial purpose and overall circumstances amount to a financial trade.
HMRC is reviewing crypto activity because exchange and service-provider information can be compared with tax returns and other taxpayer records. Its official guidance confirms that people who traded cryptoassets may receive letters, emails or text messages asking them to check and report crypto income or gains.
Receiving a letter does not automatically mean HMRC has opened a formal investigation or decided that tax is due. It does mean the taxpayer should carry out a proper reconciliation rather than reply from memory.
A review should include:
One common mistake is to review only cash withdrawals. A taxable disposal may have occurred even where the proceeds remained within the crypto ecosystem.
Capital gains tax can arise when an individual sells, exchanges, spends or gives away cryptoassets. The tax is charged on the gain, not the total amount received.
HMRC treats the following transactions as disposals:
HMRC specifically confirms that exchanging one type of token for another is a disposal. Moving the same tokens between wallets that remain under the same beneficial ownership is not normally a disposal.
The gain is broadly calculated as:
Sterling disposal value minus allowable acquisition cost and allowable transaction costs
Allowable costs may include acquisition expenditure, transaction fees, certain valuation costs and the appropriate share of a pooled acquisition cost. Costs already deducted for Income Tax cannot normally be deducted again.
Crypto received from employment, mining, staking or lending can create an Income Tax liability at the point of receipt. Its sterling value at that time is normally used to calculate the taxable amount.
HMRC allows up to £1,000 of combined trading and miscellaneous income each tax year through the trading and miscellaneous income allowance. Crypto income counts towards the same allowance as other relevant income sources. Where total miscellaneous income is between £1,000 and £2,500, HMRC says the individual should contact it. Where it exceeds £2,500, self-assessment registration may be required.
An airdrop does not automatically create Income Tax. HMRC says Income Tax may not apply where tokens are received without the recipient providing a service, meeting conditions or carrying on a related trade. A later sale or exchange can still produce a chargeable gain.
Where income tax has already been charged on tokens, the value taxed as income generally becomes part of their acquisition cost. Capital gains tax is then considered only on the subsequent increase or decrease in value.
For 2026/27, individuals have a capital gains tax annual exempt amount of £3,000. Gains falling within the unused basic-rate band are generally taxed at 18%, while gains above that band are generally taxed at 24%.
Income from employment, staking, mining or lending is taxed under the relevant Income Tax rules rather than the Capital Gains Tax rates. The precise rate depends on the taxpayer’s total income, residence and circumstances. Scottish Income Tax bands differ for certain types of non-savings, non-dividend income.
Suppose an individual has taxable income of £30,000 and makes total net crypto gains of £15,000 during 2026/27.
This assumes there are no other gains, losses or reliefs affecting the calculation.
A separate reporting rule can apply even where the gain is below £3,000. An individual already registered for self-assessment must report capital disposals if the total proceeds from relevant assets exceed £50,000 for 2023/24 onwards.
Fungible tokens of the same type are normally grouped into a separate Section 104 pool. Instead of identifying the precise bitcoin or ether sold, the taxpayer maintains a running quantity and pooled allowable cost.
Each token type requires its own pool. Bitcoin, ether and another token would therefore have three separate calculations.
Disposals are matched in this order:
The 30-day rule can affect people who sell tokens and buy the same type back shortly afterwards. It may prevent the new purchase cost from immediately entering the general pool and instead match it against the earlier disposal.
NFTs are normally separately identifiable. HMRC therefore states that they are not pooled in the same way as interchangeable tokens.
Pooling is one reason exchange-generated gain reports should not be accepted without checking them. A platform may not know what the user holds elsewhere, whether tokens were transferred between personal wallets or whether a same-day or 30-day acquisition occurred on another exchange.
Taxpayers must keep records showing how each taxable figure was calculated. An exchange statement alone is rarely sufficient where several platforms or private wallets have been used.
Records should include:
HMRC warns that exchange reports are not tax calculations and do not maintain a taxpayer’s complete pooled costs. Individuals remain responsible for keeping their own records.
Values must be converted into pounds sterling using a reasonable and consistently applied valuation at the relevant transaction time. Retaining the pricing source and calculation is particularly important for low-liquidity tokens.
The Cryptoasset Reporting Framework requires relevant service providers to collect identifying information and report transaction data. It gives HMRC a more systematic method of linking crypto activity to individual and business tax records.
Since 1 January 2026, service providers have been required to collect details, including a customer’s:
Entities may also need to provide information about their controlling persons.
The first provider reports must be submitted between 1 January and 31 May 2027, covering the calendar year from 1 January to 31 December 2026. Subsequent reports are due by 31 May for the preceding calendar year.
Using an overseas exchange does not necessarily keep the activity outside HMRC’s view. Where the provider’s country participates in the same international reporting arrangements, its tax authority can share information with HMRC.
CARF data does not calculate the customer’s UK tax liability. It provides transaction and identity information that HMRC can compare with declared income and gains. The taxpayer must still apply the UK income, disposal, pooling and loss rules correctly.
You should verify the communication, preserve the underlying records and calculate the correct position before replying. A rushed response based only on one exchange account may create further inconsistencies.
Take the following steps:
Where the records involve multiple wallets, DeFi arrangements, historic transactions or missing acquisition values, obtaining professional HMRC investigation support before responding can reduce the risk of providing an incomplete explanation.
Undeclared crypto income or gains should be corrected using the route appropriate to the tax year and the taxpayer’s filing position. HMRC operates a dedicated Cryptoasset Disclosure Service for unpaid Income Tax and Capital Gains Tax relating to assets including exchange tokens, NFTs and utility tokens.
The number of years covered depends partly on the taxpayer’s behaviour:
HMRC charges interest from the date the tax should have been paid. Its crypto disclosure guidance also requires the taxpayer to calculate the appropriate penalties and generally pay the disclosed amount within 30 days of submitting the disclosure.
Penalties are fact-specific. HMRC states that where it identifies unpaid crypto tax, a penalty can reach 100% of the tax due, plus interest, with potentially higher penalties for offshore matters. This is a maximum rather than an automatic rate. The final percentage depends on matters such as behaviour, disclosure and cooperation.
A voluntary and complete disclosure will generally place a taxpayer in a stronger position than waiting for HMRC to identify the discrepancy.
The government has published draft legislation proposing new rules for eligible stablecoins, cryptoasset loans and liquidity pools from April 2027. These measures are not yet the rules for 2026/27 and should not be applied early.
The proposed changes include:
The government intends to include these measures in Finance Bill 2026/27. Draft legislation was released for technical consultation, which means the final wording may change before enactment.
Until the legislation takes effect, eligible stablecoin exchanges and transfers into lending or liquidity arrangements must be considered under the existing rules. Taxpayers should not assume that a stablecoin transaction is currently exempt merely because its value is linked to sterling or another fiat currency.
For more background on the reporting changes, see our guide to crypto tax reporting requirements in the UK.
Buying cryptoassets and continuing to hold them does not normally create an immediate Capital Gains Tax charge. Tax is generally considered when the tokens are sold, exchanged, spent or given away. Income Tax may apply earlier where the tokens were received as earnings or rewards.
Yes. Exchanging one type of token for another is normally a disposal for Capital Gains Tax, even when no pounds enter a bank account. The sterling market value of the tokens received is used when calculating the disposal proceeds.
Losing a private key does not itself count as a disposal because the tokens still exist on the distributed ledger. A negligible-value claim may be possible where there is no realistic prospect of recovering the key or accessing the assets. Evidence of the loss and recovery attempts should be retained.
You will not normally pay Capital Gains Tax where total taxable gains remain within the annual exempt amount. However, someone already within Self Assessment must report relevant disposals if total proceeds exceed £50,000. Reporting a capital loss may also be worthwhile so it can be used against qualifying gains in later years.
HMRC may receive information from overseas providers where the relevant country participates in international cryptoasset reporting arrangements. CARF is designed to allow transaction and identity information to be exchanged between participating tax authorities.
There is no general legal requirement to appoint an accountant solely because you own cryptoassets. Professional assistance is required where there are multiple exchanges, DeFi transactions, missing records, historic liabilities, large gains or HMRC correspondence. The value lies in reconstructing the figures correctly and applying the income, pooling and disclosure rules consistently.
Professional advice is particularly useful before responding to HMRC, correcting several tax years or submitting calculations involving multiple exchanges and wallets.
Apex Accountants can review transaction records, reconstruct token pools, separate income from capital gains and assess whether a tax return amendment or disclosure is required. Our capital gains tax services and HMRC tax investigation support can provide a structured route to correcting the position.
The next step is to book a consultation before replying to HMRC or submitting figures that may be incomplete.
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