For British expats, a UK Individual Savings Account can be one of the most valuable savings and investment tools available. But what happens when you move abroad?

This is where many British expats discover an unexpected problem. An ISA may remain perfectly valid in the UK, but its tax advantages may not be recognised in your new country of residence.

If you are planning to move overseas, understanding what happens to your UK ISA before you leave can help you avoid unnecessary tax, administrative complications and potentially unsuitable investments.

The good news is that moving abroad does not automatically mean losing your ISA. In fact, for someone who expects to return to the UK after a few years, maintaining access to an ISA solution can be an important part of their financial planning.

However, if your move is intended to be permanent, a locally compliant investment solution may be more appropriate.

What happens to your ISA when you move abroad?

The first thing to understand is that your ISA does not simply disappear when you become a non UK resident.

HMRC confirms that you can keep an existing ISA after moving abroad. You can continue to benefit from the UK tax treatment of investments held within the ISA, although you cannot normally make new contributions once you become non UK resident. You should also inform your ISA provider when you stop being UK resident.

For the 2026 to 2027 tax year, the UK ISA allowance is £20,000. However, that allowance is generally only available while you are eligible to contribute as a UK resident.

This creates an important distinction for British expats:

Keeping an existing ISA is not the same as continuing to benefit from an ISA in your new country of residence.

The UK may continue to recognise the ISA as tax efficient. Your new country may not.

Why can a UK ISA become an expat tax trap?

An ISA is designed around the UK tax system.

When you become resident somewhere else, you need to consider how that country treats the investments and income held within your ISA.

For example, a French tax resident may not receive the same tax treatment that they would have received as a UK resident. The fact that an investment is held inside a UK ISA does not automatically mean that France will treat the underlying income or gains as tax free.

This is one of the biggest misconceptions surrounding ISAs for British expats.

The important question is therefore not simply:

Can I keep my ISA?

It is:

How will my new country of residence tax the ISA?

Your answer can depend on the country, your tax residence, the investments held and your personal circumstances.

What should you do before moving abroad?

Planning before you leave the UK can make a significant difference.

1. Establish when your UK tax residence will change

Your UK tax residence is not necessarily determined simply by the date you board a plane.

HMRC’s Statutory Residence Test considers factors including the number of days you spend in the UK, your home and your connections with the UK. When you move in or out of the UK, you may also qualify for split year treatment if the relevant conditions are met.

Understanding your residence position is therefore an important first step.

2. Review your existing ISA

Before leaving the UK, review what you actually hold inside your ISA.

You may have:

• Cash ISAs
• Stocks and Shares ISAs
• Investment funds
• ETFs
• Individual shares
• Other investments

Consider the investment strategy, costs, risk level and whether the investments remain appropriate for your future plans.

3. Think about how long you intend to stay abroad

This is perhaps the most important question.

If you are moving overseas for two, three or five years before potentially returning to Britain, your financial strategy may be very different from someone who intends to settle abroad permanently.

For someone expecting to return to the UK, maintaining an ISA structure can potentially make sense because the ISA can remain in place while you are abroad and contributions can resume once you return to UK residence, subject to the relevant rules and allowance.

For someone planning to remain abroad indefinitely, however, it may be worth considering whether a locally compliant investment structure is more appropriate.

Harrison Brook’s ISA solution for British expats

At Harrison Brook, we recognise that many people who move abroad do not necessarily know whether their move will be permanent.

Perhaps you are moving to Spain for a few years.

Perhaps you are relocating for work.

Perhaps you want to try life overseas before deciding whether to settle permanently.

In these circumstances, preserving the benefits of an ISA structure can form part of a wider financial plan.

Harrison Brook can advise British expats on ISA solutions designed for people living internationally, including those who expect to return to the UK.

The objective is not simply to keep an ISA because it is an ISA. It is to consider how the structure fits into your wider financial plans, your likely future residence and your investment objectives.

What if you plan to stay abroad permanently?

This is where the strategy can change.

If you have decided that your new country is home, leaving your investments sitting inside a UK ISA indefinitely may not necessarily be the most efficient approach.

Instead, it can be worth investigating a locally compliant investment solution.

For example, a British expat who becomes resident in France may consider an Assurance Vie.

An Assurance Vie is a French investment wrapper that can provide a tax efficient environment for investments and can also have important succession planning benefits. French government guidance confirms that the taxation of an Assurance Vie depends on factors including when contributions were made and how long the contract has been held, with specific tax treatment applying after eight years.

This does not mean that every British expat in France should automatically move their ISA into an Assurance Vie.

It means that if you are planning to remain in France long term, it may be sensible to compare the UK ISA with a structure that is designed to operate within the French tax system.

The same principle applies elsewhere. The appropriate solution depends on the country in which you are resident.

What about returning to the UK?

Your plans can change.

Someone who initially expects to stay abroad permanently may eventually decide to return to Britain. Equally, someone who moves overseas for a short period may decide to remain abroad.

This is why international financial planning should be flexible.

If you return to the UK and become UK resident again, you can generally resume contributions to an ISA, subject to the annual ISA allowance.

Your investment strategy should therefore be reviewed whenever your tax residence changes.

What should you do after moving abroad?

Once you have moved, your financial checklist should include:

Tell your ISA provider that you have become non UK resident.

Stop making ISA contributions unless you fall within one of the limited exceptions.

Review the tax treatment of your ISA in your new country.

Check your investments to make sure they remain suitable.

Consider local investment structures if you intend to remain abroad.

Review your position regularly if your circumstances or country of residence change.

You should also consider your wider financial arrangements. Your UK pension, bank accounts, investments, property and estate planning may all need to be reviewed when you become an expat.

The key question is not whether you can keep your ISA

For British expats, the ISA question is often presented too simply.

Yes, you can generally keep an existing UK ISA after moving abroad.

But that does not necessarily mean it remains the most suitable investment structure for your life overseas.

If you are likely to return to Britain after a few years, preserving an ISA solution may be worth considering.

If you intend to make your new country your permanent home, a locally compliant solution such as an Assurance Vie for French residents may be worth investigating.

The right answer depends on where you live, where you expect to live in the future, your investment objectives and your personal tax circumstances.

FAQs – The UK ISA Expat Trap

Can I keep my UK ISA if I move abroad?

Yes. You can generally keep an existing ISA when you become non UK resident. However, you normally cannot make new contributions while you are non UK resident.

Can I pay into my ISA while living abroad?

Generally, no. Once you become non UK resident, you cannot normally make new ISA contributions. You should inform your ISA provider when your UK residence status changes.

Will my ISA remain tax free if I live abroad?

The UK may continue to provide tax relief within your ISA, but your new country of residence may not recognise the ISA’s UK tax advantages. You therefore need to check the local tax treatment.

Should I move my ISA if I move to France?

Not necessarily. If you expect to return to the UK, maintaining an ISA structure may be relevant. If you intend to remain in France permanently, comparing your ISA with a locally compliant solution such as an Assurance Vie may be appropriate.

Can I use an ISA after returning to the UK?

Yes. Once you become UK resident again, you can generally contribute to an ISA subject to the annual allowance and applicable rules.

How Harrison Brook can help

Moving abroad should not mean putting your financial planning on hold.

At Harrison Brook, we specialise in helping British expats understand their savings and investment options across borders. Whether you are moving overseas temporarily and want to preserve your ISA strategy, or you are settling abroad permanently and need to consider a locally compliant solution, we can help you assess your options.

Our advisers can look at your existing investments, future plans, country of residence and long term objectives before helping you establish an appropriate strategy.

If you are moving abroad or already living overseas, contact Harrison Brook today to arrange an initial consultation and discuss your options.