14th October 2025

Cryptocurrency has moved from the fringe to the mainstream. With Bitcoin, Ethereum and other digital assets now part of many portfolios, it is essential to understand how they are taxed in the United Kingdom and as an expat.

The rules are complex, and HMRC treats cryptocurrencies differently depending on how they are used and held.

This guide explains the key tax considerations for individuals.

What Are Cryptocurrencies?

Cryptocurrencies or cryptoassets are cryptographically secured digital representations of value or contractual rights. They can be transferred, stored and traded electronically. Examples include Bitcoin, Ethereum, Tether and Ripple.

While they share characteristics with traditional investments, their legal and tax treatment under UK law is distinct.

Which UK Taxes Apply to Cryptocurrency?

In most cases, individuals hold cryptocurrencies as personal investments, usually for capital appreciation or online purchases. When you sell or exchange crypto, you may need to pay Capital Gains Tax (CGT).

However, some circumstances trigger Income Tax and National Insurance contributions instead.

These include situations where you:

• Receive cryptocurrency from your employer as payment.
• Earn coins or tokens through mining or validating transactions.
• Receive coins from an airdrop or similar promotion.

In rare cases, HMRC may view your activity as running a business. If so, your profits will be taxed as trading income, and Income Tax will take priority over Capital Gains Tax.

When Does a Taxable Disposal Occur?

HMRC defines a disposal broadly. You make a disposal when you:

• Sell cryptocurrency for money.
• Exchange one cryptocurrency for another.
• Use cryptocurrency to buy goods or services.
• Gift cryptocurrency to another person.

If you give crypto to anyone other than a spouse or civil partner, you must calculate the gain or loss using the pound sterling value on the date of the transfer. Gifts to registered charities are generally exempt from CGT.

Pooling Rules for Cryptocurrency

HMRC uses a pooling system to simplify recordkeeping. Each type of cryptoasset forms its own pool, and the total cost of all tokens of that type is combined into a pooled allowable cost.

When some of the tokens are sold, a proportionate amount of the pooled allowable cost is deducted to calculate the gain or loss. This avoids tracking every transaction separately.

For example, if you hold Bitcoin, Ethereum and Tether, you would have three separate pools. Each pool adjusts as you buy or sell tokens.

Example

Omar buys 100 Bitcoin for £10,000 and later buys another 50 Bitcoin for £140,000. His total pool is 150 Bitcoin with a combined cost of £150,000.

He sells 50 Bitcoin for £800,000. His allowable cost for this sale is £50,000 (150,000 × 50 ÷ 150). Omar’s gain is £750,000, which is subject to Capital Gains Tax. His remaining pool is 100 Bitcoin with allowable costs of £100,000.

The 30-Day Rule

Special rules apply if you buy crypto within 30 days of selling the same asset. The new acquisition is matched against the disposal before the remaining pool is used.

For example, Elaine sells 40 Bitcoin for £80,000 and buys 5 Bitcoin within 30 days for £8,750. HMRC treats her as having sold those 5 newly purchased coins first. She calculates the gain on those 5 coins separately before calculating the gain on the 35 sold from the pool.

These rules prevent investors from selling assets to crystallise a tax loss and repurchasing them immediately.

Reporting Gains and Losses

If you sell cryptocurrency for more than your allowable cost, you will have a gain. If you sell for less, you will have a loss. Allowable losses can offset gains, reducing your overall tax bill, but they must be reported to HMRC first.

Most crypto exchanges trade in foreign currencies, so all figures must be converted into pounds sterling using a consistent exchange rate. Keep detailed records of valuations, exchange rates, and the methodology used.

Residence and Tax Exposure

Your liability to UK tax on cryptocurrency depends on your residence status.

• If you are a UK tax resident and have been resident for more than four tax years, you are taxed on your worldwide gains.
• If you are a non-resident for more than five consecutive tax years, gains realised during that period are normally outside the UK tax net.
• Correctly determining your residence status under the Statutory Residence Test is vital, as errors can lead to unexpected liabilities.

Inheritance Tax (IHT) on Cryptocurrency

Cryptocurrency is subject to Inheritance Tax in the same way as other assets, such as property or shares. The location of the asset, for tax purposes, depends on the residency of the beneficial owner at the time of death.

If you are a Long-Term UK Resident (generally resident for ten out of the last twenty years), your worldwide assets, including crypto holdings, fall within the UK Inheritance Tax net. The rate is 40% on the portion of your estate that exceeds the available exemptions.

If you are not a Long-Term Resident, only UK-based assets are liable. For many expatriates, this distinction makes residency and succession planning essential.

Estate Planning for Digital Assets

Unlike traditional investments, cryptocurrencies require special handling when planning your estate. Without access to private keys or seed phrases, your digital assets may be lost permanently.

As part of your estate plan, consider:

• Listing wallet addresses, exchange accounts and balances.
• Storing access details securely, but not within your Will.
• Updating your Will to reference how your crypto assets should be handled.

Because Wills become public after probate, access credentials should be stored privately and securely.

Self-Assessment and Recordkeeping

If you hold or trade cryptocurrency, you may need to include the details on your Self-Assessment tax return.

Reasonable care should be taken to ensure valuations are accurate, consistent and backed by records. HMRC expects clear documentation of:

• Acquisition and disposal dates
• Transaction values and exchange rates
• Pooling calculations
• Evidence of charitable gifts or transfers

Accurate recordkeeping ensures compliance and simplifies reporting in future tax years.

This is wealth. Built with Wisdom.

If you’d like to discuss UK tax, wealth management, or succession planning, our advisers are here to help

Please note this is a general guide and is not advice that can be relied on. It is important that you seek specific advice for your own circumstances. 

This material is intended for both Professional and Retail Clients, as defined by the Dubai Financial Services Authority. Metis Financial Planning Limited is regulated by the Dubai Financial Services Authority.