HMRC Crypto Capital Gains Tax: What UK Investors Need to Know in 2026?

Crypto investors in the UK can no longer assume that tax only becomes relevant when cryptocurrency is converted back into pounds. Under HMRC rules, selling Bitcoin, swapping Ethereum for another token, spending cryptocurrency or giving crypto away can all potentially create a taxable disposal.

For most individuals holding cryptocurrency as an investment, HMRC crypto capital gains tax rules mean Capital Gains Tax (CGT) may become payable when a profit is realised. HMRC states that individuals will normally be treated as investors rather than financial traders, meaning CGT generally applies to gains from disposals.

The issue has become particularly important in 2026. The UK’s Cryptoasset Reporting Framework (CARF) took effect from 1 January 2026, requiring qualifying cryptoasset service providers to collect information about users and transactions.

The first reports covering transactions between 1 January and 31 December 2026 must be submitted to HMRC by 31 May 2027.

For investors, that makes accurate record keeping and tax reporting increasingly important.

When Does HMRC Charge Capital Gains Tax on Crypto?

HMRC generally treats cryptoassets such as Bitcoin and Ether as chargeable assets for Capital Gains Tax purposes when they are held as investments.

A potential CGT event occurs when a person disposes of cryptocurrency. A disposal does not simply mean withdrawing money into a bank account.

HMRC says a disposal can include:

• Selling cryptocurrency for pounds or another traditional currency
• Swapping one cryptocurrency for another
• Using cryptocurrency to purchase goods or services
• Giving cryptocurrency to another person, subject to certain exemptions

This means an investor who exchanges Bitcoin directly for Ethereum may have made a taxable disposal of the Bitcoin even though no pounds entered their bank account.

That crypto-to-crypto rule is one of the areas most likely to catch inexperienced investors out.

Is Moving Crypto Between Your Own Wallets Taxable?

Normally, no.

Transferring cryptocurrency from an exchange account to a personal wallet, or between two wallets that are beneficially owned by the same individual, does not normally constitute a disposal.

HMRC’s Cryptoassets Manual confirms that where beneficial ownership remains with the same person throughout the transaction, moving tokens between addresses controlled by that person is not itself a disposal.

However, transaction and blockchain records should still be retained so that the movement can be distinguished from a sale or transfer to another person.

How Much Crypto Profit Is Tax-Free in 2026/27?

The Capital Gains Tax annual exempt amount is £3,000 for individuals in the 2026/27 tax year.

The same £3,000 allowance also applied in 2025/26 and 2024/25.

The important point is that the £3,000 allowance applies to a person’s overall net chargeable gains, not separately to every cryptocurrency.

For example, an investor cannot claim £3,000 against Bitcoin profits and another £3,000 against Ethereum profits.

Gains and allowable losses from relevant disposals across the tax year generally need to be considered together.

What Are the HMRC Crypto Capital Gains Tax Rates for 2026/27?

From 6 April 2026, the standard Capital Gains Tax rates for individuals are 18% and 24%.

Which rate applies depends partly on the person’s taxable income and how much of the basic rate income tax band remains available after taxable income is taken into account.

A crypto investor could therefore have some gains taxed at 18% and the remainder at 24%.

Investors should not automatically multiply their entire crypto gain by one rate without considering their wider taxable income and other chargeable gains.

How Is Capital Gains Tax on Cryptocurrency Calculated?

At its simplest, a capital gain is broadly calculated by taking the value received when cryptocurrency is disposed of and deducting the allowable acquisition cost and qualifying expenses.

A simplified calculation may look like:

Disposal value − allowable acquisition cost − allowable expenses = capital gain

However, crypto calculations become more complicated where a person has bought the same token on multiple occasions.

HMRC requires each type of token to be grouped into its own pool for CGT purposes. The pooled allowable cost is then adjusted when further tokens are bought or disposed of.

Example of a Simple Crypto Capital Gain

Suppose an investor acquires cryptocurrency for £8,000.

It is later sold for £15,000 and £200 of qualifying transaction costs are associated with the disposal.

The simplified gain would be:

Assuming there are no other gains, losses or adjustments, £3,800 would remain after the annual exempt amount.

At 18%, that would equate to £684 of CGT.

At 24%, it would equate to £912.

The actual liability can differ because the correct CGT rate depends on the individual’s taxable income and because pooling, previous losses and other transactions may affect the calculation.

What Crypto Costs Can Be Deducted From a Gain?

HMRC permits certain costs to be included when calculating cryptocurrency gains.

Depending on the circumstances, allowable costs can include:

• The amount originally paid for the cryptocurrency
• Certain transaction fees
• Costs associated with advertising for a buyer or seller
• Contract preparation costs
• Certain valuation costs
• The appropriate proportion of the pooled acquisition cost

HMRC specifically states that costs already deducted for Income Tax cannot normally be deducted again for CGT. Mining equipment and electricity costs are also examples HMRC gives of costs that cannot simply be deducted when calculating a capital gain.

Accurate transaction histories are therefore essential.

How Do HMRC’s Crypto Pooling Rules Work?

UK cryptocurrency taxation does not generally allow an investor simply to choose which Bitcoin or Ethereum purchase was sold.

HMRC applies rules broadly comparable to those used for shares.

Each type of token normally has its own Section 104 pool containing the quantity held and its pooled allowable acquisition cost.

There are also special matching rules.

Same-Day Rule

Where the same type of cryptoasset is bought and sold on the same day, the transactions are generally matched before the main pool is considered.

30-Day Rule

If tokens of the same type are acquired within 30 days after a disposal, those acquisitions may be matched against the earlier disposal before the Section 104 pool is used.

HMRC’s manual specifically sets out both the same-day and 30-day matching rules for cryptoassets.

These rules can make tax calculations substantially more complicated for investors who frequently buy and sell the same tokens.

Does Swapping One Cryptocurrency for Another Trigger CGT?

Yes, potentially.

Exchanging Bitcoin for Ethereum, Ethereum for Solana or one token for a stablecoin can represent a disposal for Capital Gains Tax purposes.

HMRC expects a sterling value to be established for crypto-to-crypto transactions even where neither side of the transaction involved pounds.

Where a transaction does not have an obvious GBP value, HMRC says an appropriate exchange rate should be established and a consistent valuation methodology should be used. The methodology should also be retained as part of the investor’s records.

For example, someone exchanging Bitcoin worth £20,000 for another cryptocurrency is generally treated as disposing of £20,000 worth of Bitcoin for CGT purposes.

Any gain or loss on that Bitcoin disposal therefore has to be calculated.

Does Selling Crypto at a Loss Matter?

Yes.

Allowable capital losses can potentially reduce taxable capital gains.

For example, an investor could make:

• £10,000 gain on Bitcoin
• £4,000 allowable loss on another cryptoasset

Subject to the relevant rules, the loss could reduce the overall gain before the annual exempt amount is considered.

Losses can therefore be valuable from a tax-planning perspective, but they need to be properly calculated and reported or claimed where required.

Investors should also be cautious when deliberately selling and quickly repurchasing cryptocurrency simply to generate a loss because the 30-day matching rules can affect the result.

When Do Crypto Gains Have to Be Reported to HMRC?

A person generally needs to report and pay Capital Gains Tax when taxable gains exceed the applicable annual exempt amount.

Even where gains remain below the allowance, additional reporting requirements can arise for people already registered for Self Assessment.

For tax years from 2023/24 onwards, GOV.UK states that a Self Assessment taxpayer whose gains remain below the allowance must still report them if the total amount for which relevant assets were disposed of exceeds £50,000.

Crypto gains and losses can be reported through the Capital Gains section of a Self Assessment tax return. HMRC’s current SA108 supplementary pages are used for recording capital gains and losses.

Taxpayers should check the rules applying to their particular tax year rather than assuming a previous year’s threshold still applies.

What Records Should Crypto Investors Keep for HMRC?

Crypto investors should retain sufficient records to reconstruct their transactions and explain how gains and losses were calculated.

Useful records include:

• Cryptocurrency bought and sold
• Number of tokens involved
• Transaction dates
• GBP value at the time of each transaction
• Purchase costs
• Disposal proceeds
• Exchange and transaction fees
• Wallet addresses
• Exchange statements
• Transaction IDs
• Calculations of pooled costs
• Valuation methodology for crypto-to-crypto transactions

Exchange histories should not be treated as permanent records. Accounts can be closed, platforms can fail and transaction data can become difficult to retrieve several years later.

Downloading transaction histories regularly can make future tax calculations considerably easier.

Can HMRC See Cryptocurrency Transactions?

HMRC’s access to crypto-related information is becoming significantly stronger.

From 1 January 2026, UK reporting cryptoasset service providers falling within CARF must carry out due diligence and collect information on relevant users and their transactions.

Information collected can include user details such as:

• Full name
• Address
• Country of tax residence
• Tax identification information

Relevant service providers are also required to report summaries of qualifying transactions. The first UK CARF reporting window covers activity between 1 January and 31 December 2026, with reports due by 31 May 2027.

CARF does not create a new Capital Gains Tax on cryptocurrency. The underlying tax obligations already exist.

What changes is the amount of information potentially available to tax authorities.

What Should Someone Do If They Forgot to Declare Crypto Tax?

Ignoring a previous undeclared gain is unlikely to be the best approach.

HMRC operates a dedicated mechanism for people who identify unpaid tax relating to cryptoassets, including exchange tokens, NFTs and utility tokens.

HMRC states that taxpayers who do not declare unpaid crypto tax may face additional interest and penalties. Current or previous-year income and gains may instead need to be dealt with through Self Assessment depending on the circumstances.

Someone discovering several years of incorrect or missing cryptocurrency declarations may benefit from professional tax advice before making a disclosure, particularly where transaction histories are large or incomplete.

Is Crypto Always Subject to Capital Gains Tax?

No.

Capital Gains Tax is the normal treatment for individuals holding crypto as an investment, but other taxes can apply.

HMRC says Income Tax and potentially National Insurance can apply when cryptocurrency is received through activities such as employment, mining or certain other income-generating activities.

Only in exceptional circumstances would HMRC normally expect an individual’s buying and selling activity to be sufficiently organised, frequent and sophisticated to amount to a financial trade in its own right.

Where the activity does constitute trading, Income Tax rules can take priority over CGT.

This distinction can have a significant effect on the amount of tax owed.

What Happens If a UK Company Owns Cryptocurrency?

Businesses need to be particularly careful not to assume that the personal CGT rules automatically apply.

HMRC says businesses carrying out cryptoasset activities can potentially be liable for taxes including:

• Corporation Tax
• Corporation Tax on chargeable gains
• Income Tax
• Capital Gains Tax
• National Insurance
• VAT

The appropriate treatment depends on the structure of the business and the nature of its crypto activity. Companies declare relevant profits and gains through their Company Tax Return rather than treating the company’s crypto portfolio as though it belonged personally to a director.

Business owners who hold some cryptocurrency personally and some through a limited company should therefore keep the two sets of records clearly separated.

What Does CARF Mean for UK Crypto Investors?

CARF is one of the biggest practical changes to UK crypto tax compliance in recent years.

It does not mean every cryptocurrency transaction automatically results in tax.

It also does not remove the investor’s responsibility for calculating the correct liability.

Instead, it creates a much more systematic reporting framework through which cryptoasset service providers can supply tax-relevant information to HMRC.

For investors, the practical message is straightforward: records maintained by an individual should increasingly be capable of reconciling with information held by exchanges and potentially reported to HMRC.

Trying to reconstruct several years of trades only after receiving an HMRC enquiry can be considerably more difficult than maintaining those records as transactions occur.

How Can Crypto Investors Reduce the Risk of HMRC Problems?

Good compliance begins with understanding that taxable disposals extend beyond cash withdrawals.

Investors should:

1. Download transaction records regularly from every exchange used.
2. Record wallet-to-wallet transfers so they are not incorrectly treated as disposals.
3. Track crypto-to-crypto swaps rather than recording only GBP withdrawals.
4. Maintain separate Section 104 pools for each type of token.
5. Apply same-day and 30-day rules where applicable.
6. Record all values in pounds sterling using a consistent methodology.
7. Claim legitimate capital losses where appropriate.
8. Check Self Assessment reporting requirements each year.
9. Review previous tax years if crypto disposals have never been declared.
10. Seek professional advice where DeFi, staking, NFTs, lending, large numbers of transactions or company-held crypto make the position unclear.

The growth of automated reporting means relying on an exchange account being overseas, assuming that crypto-to-crypto transactions are invisible, or only declaring money withdrawn to a UK bank account is increasingly risky.

Conclusion

The HMRC crypto capital gains tax rules are becoming increasingly important as cryptocurrency investing moves further into the mainstream and HMRC gains greater access to transaction information.

For the 2026/27 tax year, individuals have a £3,000 Capital Gains Tax annual exempt amount, while the main individual CGT rates are 18% and 24%. Selling cryptocurrency is not the only event that matters: exchanging one token for another, buying something with crypto or giving assets away can also create a disposal.

With CARF data collection already in force from 1 January 2026 and the first reports due to HMRC by 31 May 2027, investors should ensure their transaction histories, pooled costs, valuations and previous tax declarations are accurate.

Frequently Asked Questions

Does HMRC charge Capital Gains Tax when Bitcoin is sold?

Potentially. If Bitcoin is held as an investment and sold for a gain, that gain is normally considered under Capital Gains Tax rules. Tax becomes payable where overall taxable gains exceed the available allowance.

Do I pay tax if I swap Bitcoin for Ethereum?

A Bitcoin-to-Ethereum swap can create a disposal of Bitcoin for Capital Gains Tax purposes. The sterling market value at the time of the exchange needs to be established when calculating the gain or loss.

How much cryptocurrency can I sell tax-free in the UK?

There is no fixed amount of cryptocurrency that can simply be sold tax-free. CGT is generally based on the gain rather than the total value sold. The individual annual exempt amount for 2026/27 is £3,000.

Does HMRC know about Coinbase or other crypto exchange transactions?

HMRC can obtain crypto-related information through various compliance and information-sharing mechanisms. CARF significantly expands systematic reporting, with qualifying UK cryptoasset service providers collecting information from 1 January 2026 and their first reports due by 31 May 2027.

Is transferring Bitcoin to another wallet taxable?

Moving cryptocurrency between wallets beneficially owned by the same person is normally not a disposal. Records should still be kept to demonstrate that ownership did not change.

What happens if crypto gains were not declared to HMRC?

Previous undeclared gains may need to be corrected. HMRC provides a dedicated service for disclosing unpaid tax relating to cryptoassets, and interest or penalties may apply depending on the circumstances.

Are crypto gains taxed at 18% or 24%?

For individuals, the main CGT rates from 6 April 2026 are 18% and 24%. The rate that applies depends on taxable income and the amount of gain falling within the relevant tax bands.