Cryptoassets and Tax: Why It's Important to Declare Your Income and Gains to HMRC

Cryptocurrency has become an increasingly popular investment, with Bitcoin, Ethereum and other digital assets now forming part of many individuals' investment portfolios. However, despite their growing popularity, there is still confusion surrounding how cryptoassets are taxed in the UK.

One common misconception is that cryptocurrency transactions are anonymous or fall outside the scope of HMRC. In reality, cryptoassets are subject to UK tax rules, and failing to declare taxable income or gains could result in interest, penalties and potentially further investigation.

With HMRC increasing its scrutiny of cryptocurrency transactions and new reporting requirements coming into effect, it's more important than ever for investors to understand their tax obligations.

How Are Cryptoassets Taxed in the UK?

There is no separate tax regime specifically for cryptocurrency in the UK. Instead, existing tax rules apply depending on how cryptoassets are acquired, held and disposed of.

For most individual investors, profits made from cryptocurrency are subject to Capital Gains Tax (CGT).

A taxable disposal can occur when you:

• Sell cryptocurrency in exchange for traditional currency, such as pounds sterling.

• Exchange one cryptocurrency for another, such as Bitcoin for Ethereum.

• Use cryptocurrency to purchase goods or services.

• Gift cryptocurrency to someone other than your spouse or civil partner.
  

Importantly, you don't need to withdraw money into your bank account for a taxable event to occur. Simply exchanging one cryptoasset for another can trigger a Capital Gains Tax liability.

In some circumstances, cryptocurrency received through activities such as mining or staking may instead be subject to Income Tax. The treatment will depend on the nature of the activity and whether it constitutes trading or another form of taxable income.

HMRC Is Increasing Its Focus on Cryptocurrency

HMRC has made it clear that cryptoassets are not exempt from taxation and has taken steps to improve transparency across the sector.

From 1 January 2026, new reporting requirements under the Cryptoasset Reporting Framework mean that UK cryptoasset service providers must begin collecting and reporting relevant information about their users and transactions.

This will give HMRC greater visibility of cryptocurrency activity, making it increasingly difficult for individuals to overlook or fail to declare taxable transactions.

Investors should therefore ensure that their tax affairs are accurate and up to date, particularly if they have bought, sold or exchanged cryptoassets in previous tax years.

Why Accurate Record-Keeping Matters

Cryptocurrency investments can involve numerous transactions across different platforms and wallets. Without accurate records, calculating taxable gains and income can quickly become complicated.

HMRC expects investors to maintain sufficient records of their cryptoasset activity, including:

• Dates and values of purchases and disposals.

• Details of cryptocurrency exchanges and transfers.

• Transaction fees and associated costs.

• Wallet addresses and exchange records.

• Income received through activities such as mining or staking.

It's also worth remembering that transferring cryptocurrency between wallets you beneficially own is generally not a taxable disposal. However, selling, exchanging, spending or gifting cryptoassets may create a tax liability.

Keeping clear, organised records will make it easier to calculate your tax position and provide supporting information if HMRC requests it.

What If You Haven't Declared Cryptocurrency Gains?

If you've previously made taxable gains or received income from cryptocurrency without declaring it, it's important to address the situation as soon as possible.

Errors and omissions can often be corrected through a voluntary disclosure to HMRC. Taking action before HMRC contacts you may help reduce potential penalties and demonstrate that you are taking your tax responsibilities seriously.

Leaving undeclared transactions unresolved could result in additional tax, interest and penalties.

Need Advice on Cryptocurrency Tax?

As cryptocurrency becomes more widely used, understanding the tax implications is essential for investors.

Whether you're unsure if your crypto transactions are taxable, need assistance calculating capital gains or are concerned about previously undeclared income, seeking professional advice can help you avoid costly mistakes.

At SJC, Chartered Accountants, we can help you understand your tax obligations and ensure your income and gains are reported correctly.

If you have any questions about cryptocurrency taxation or would like to review your tax position, get in touch with our team today.