Crypto Tax for UK Nationals Living Abroad

The combination of cryptocurrency and international mobility creates significant tax complexity that many people underestimate. The straightforward assumption — "I'm not in the UK, so I don't pay UK tax on crypto" — is sometimes correct, but sometimes very wrong. Getting it wrong can result in significant tax bills and penalties.

This guide sets out HMRC's current position on crypto for non-residents, the critical temporary non-residence trap, and the practical steps worth taking.

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HMRC's View on Cryptocurrency

HMRC does not regard cryptocurrency as currency. It treats crypto assets (Bitcoin, Ether, and the vast majority of other tokens) as "chargeable assets" for Capital Gains Tax purposes — similar in treatment to shares or investment property. This means:

• Disposal of cryptocurrency triggers a chargeable event. A disposal includes: selling crypto for fiat currency (pounds, euros, dollars), exchanging one crypto for another, using crypto to pay for goods or services, and gifting crypto (other than to a spouse or civil partner).
• The gain is calculated as the disposal proceeds minus the allowable cost of acquisition (on a pooled basis under the share identification rules).
• Losses can be offset against gains in the same tax year or carried forward.
• The annual CGT exempt amount (£3,000 in 2024–25) can be applied to reduce the taxable gain, subject to any restrictions based on residency and treaty provisions.

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Non-Residents and UK CGT on Crypto

For most assets, non-UK residents are not subject to UK CGT. This is why living abroad is generally advantageous for capital gains planning — you can sell shares, investment funds, and similar assets without UK CGT (subject to the temporary non-residence rules discussed below).

Crypto is complicated by a question of location. For UK CGT purposes, UK-situs assets are within the scope of CGT for non-residents; non-UK-situs assets are not. The "situs" (location) of an asset for tax purposes follows specific rules:

• UK land and property: clearly UK-situs
• UK-registered company shares: UK-situs
• Most other assets: depends on where they are "situated" in law

Where is cryptocurrency "situated"? This is genuinely contested and unresolved. HMRC's position, as set out in its Crypto Assets Manual, is that the location of a crypto asset broadly follows the location of the person who has the ability to exercise the rights — i.e., the holder. This means HMRC argues that crypto held by a UK national living abroad may be UK-situs because the holder is in the UK... which is circular reasoning that illustrates the uncertainty in this area.

The honest answer is that the legal situs of cryptocurrency for UK CGT purposes is not definitively settled. HMRC's published guidance suggests a preference for treating crypto as UK-situs where the holder is UK-resident — but the position for non-UK-resident holders is not explicitly addressed in the same way. Take specialist tax advice if you have significant crypto gains and are non-UK resident.

The practical position. Many practitioners advise that a non-UK resident who was non-UK resident when they acquired the crypto, and remains non-UK resident when they dispose of it, is unlikely to face successful HMRC challenge on the basis of UK-situs for ordinary crypto holdings. However, this is not guaranteed, and the law in this area is evolving.

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The Temporary Non-Residence Rule — The Key Trap

This is where many internationally mobile crypto investors come unstuck. The temporary non-residence rule is a UK anti-avoidance provision that brings gains back into UK taxation if the individual leaves the UK for a period of non-residence and then returns.

How it works. If you leave the UK (become non-UK resident) and return to the UK within five full tax years, gains that you made while non-UK resident on "temporarily non-resident" assets are treated as arising in the tax year you return — and are therefore subject to UK tax.

In practice: if you were UK resident in years 1–5, moved abroad in year 6, sold crypto at a large gain in year 8, and returned to the UK in year 10 (within 5 full tax years of departure), HMRC would seek to tax the year-8 crypto gain in year 10 when you returned.

The "split year" complications. The year of departure and the year of return are often split years for tax purposes — part UK resident, part non-UK resident. Gains in the non-UK-resident part of these years are subject to their own rules.

Why this matters for crypto specifically. Crypto markets are volatile and gains can arise rapidly and unpredictably. Someone who leaves the UK intending to be non-resident for the long term, but returns within five years for personal or professional reasons, may be surprised to find crypto gains accumulated abroad are brought back into UK taxation.

The five-year window is measured from the tax year of departure to the tax year of return. Proper advice before departure — and before any large disposal — is essential.

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DeFi and Staking Income for Non-Residents

Decentralised finance (DeFi) and staking add additional complexity:

Staking rewards. HMRC's current guidance treats staking rewards as income for UK tax purposes — taxed at income tax rates rather than CGT rates. For UK residents, staking rewards are therefore subject to income tax in the year received. For non-UK residents, whether staking income is subject to UK tax depends on whether it constitutes UK-source income (complex and fact-specific).

DeFi lending and liquidity provision. HMRC has published guidance indicating that the tax treatment of DeFi activities depends on the specific mechanics of each protocol. Lending crypto may not constitute a disposal; returning the crypto with additional rewards may trigger a gain on the original lending position and income treatment on the rewards. This is an evolving area.

The honest position. DeFi tax is one of the least settled areas in UK tax. HMRC has stated it is monitoring the space and may issue further guidance. For non-residents, the interaction between UK tax rules and local tax rules in the country of residence adds further complexity. Take advice specific to your DeFi activities and residence position.

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Reporting Crypto Gains to HMRC

UK-resident individuals who have taxable crypto gains above the annual exempt amount must report them via Self Assessment. Non-UK residents with UK-source income (such as rental income) who also have crypto gains may need to report those gains depending on the circumstances.

Even if you believe no tax is due (for example, because gains are covered by the annual exempt amount), HMRC's current approach is that disposals above a certain threshold should be reported. Check the current reporting thresholds via GOV.UK or with an adviser.

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There Is No UK "Wash Sale" Rule

In the US, the "wash sale" rule prevents investors from realising a loss for tax purposes and immediately repurchasing the same asset. The UK does not have an equivalent rule for most assets — but it does have "bed and breakfasting" rules for shares and crypto.

For UK CGT purposes, if you sell a crypto asset and buy it back within 30 days, the sale is matched with the subsequent purchase (not the original cost basis) for the purpose of calculating the gain or loss. This prevents you from crystallising a loss by selling and immediately repurchasing.

If you sell crypto and do not repurchase within 30 days, or repurchase a different (even similar) crypto asset, this rule does not apply. The loss can be recognised against other gains.

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Using the CGT Annual Exempt Amount Before Leaving the UK

The CGT annual exempt amount (£3,000 in 2024–25) can be used to realise gains up to that amount tax-free each year. For someone who holds crypto with a large unrealised gain and is planning to move abroad, there is a case for progressively crystallising gains within the annual exempt amount before departure — reducing the overall gain that will eventually be subject to tax.

For example, if you hold crypto with a £30,000 unrealised gain and you have five tax years before your planned departure, using the full annual exempt amount each year could crystallise £15,000 of gain tax-free (assuming the £3,000 exemption remains in place over that period).

This strategy requires co-ordination with other capital gains and losses in each tax year, and the 30-day rule must be observed if you are repurchasing the same asset. However, it is a straightforward way to reduce the eventual tax bill using legitimately available relief.

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Key Takeaways for Expat Crypto Holders

1. Crypto is not tax-free outside the UK — the position is complex and depends on residency and the specific circumstances of each disposal.
2. The temporary non-residence rule is the biggest trap — returning to the UK within five years of departure can bring non-resident crypto gains back into UK taxation.
3. Staking and DeFi create income tax as well as CGT issues — seek specific advice on the tax treatment of DeFi activities.
4. The CGT annual exempt amount can be used strategically — both before and after departure, subject to the limitations of the temporary non-residence rules.
5. Take advice before large disposals — the law in this area is evolving and the stakes are high.

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This article provides general information only and does not constitute tax advice. Cryptocurrency tax rules are complex, changing rapidly, and depend on individual circumstances. Always seek qualified professional tax advice before making decisions. HMRC's guidance is subject to change.

How Global Investments Can Help

Global Investments advises internationally mobile clients on the intersection of crypto assets and their overall wealth and tax position. We work with specialist crypto tax advisers and can help you understand how crypto fits into your broader financial plan. Contact us to arrange a conversation.