The Lifetime ISA for US Citizens in the UK: Why the 25% Bonus Is Not the Whole Story

The Lifetime ISA adds a 25% government bonus to savings for a first home or for later life, and in the UK everything inside it grows tax-free. For a US citizen, none of that tax treatment carries across: the United States does not recognise the ISA wrapper, so the income inside is taxable in the US each year, a stocks-and-shares Lifetime ISA holding UK funds can create PFIC exposure, and the bonus itself raises a US question that no UK statement will answer. And if you leave the UK before using the account, the UK's 25% withdrawal charge may be what it costs to get your money out.

Key takeaways

A Lifetime ISA (LISA) is opened between 18 and 40. You can pay in up to £4,000 a year until 50, with a 25% bonus of up to £1,000 a year.
Charge-free withdrawals are limited to a qualifying first home, age 60, or terminal illness. Any other withdrawal carries a 25% charge that takes back more than the bonus.
The US does not recognise the ISA wrapper. Income inside a LISA is reportable on the US return as it arises.
A stocks-and-shares LISA holding UK or European funds may hold PFICs.
Whether, and when, the bonus is US income is an open question to model, not assume.
An American who leaves the UK before a qualifying use may face years of US reporting on a locked account, or the withdrawal charge.

Our guide to ISAs and Roth IRAs for US persons covers ordinary ISAs. This article is about the Lifetime ISA specifically: its bonus, its restrictions, and why they matter more to an American than to anyone else.

What the Lifetime ISA is

GOV.UK sets out the core rules. You must be 18 or over but under 40 to open a Lifetime ISA, and you must make your first payment before you turn 40. You can put in up to £4,000 each year until you are 50, and the government adds a 25% bonus to your savings, up to a maximum of £1,000 a year. At 50 you can no longer pay in or earn the bonus, but the account stays open and keeps earning interest or investment returns.

Eligibility turns on residence, not citizenship. You must be UK resident, or a member of the armed forces or a Crown servant (or their spouse or civil partner) if you live abroad. The account comes as cash or as stocks and shares, a difference that matters a great deal on the US side.

Qualifying withdrawals

GOV.UK lists the ways money can leave a LISA without a charge. For a first home, all of the following must apply: the property costs £450,000 or less, you buy it at least 12 months after your first payment into the LISA, a conveyancer or solicitor acts for you in the purchase, you buy with a mortgage, and you are a first-time buyer. You can also withdraw without a charge once you are 60 or over, or if you are terminally ill with less than 12 months to live. No charge applies to withdrawing funds on death.

The withdrawal charge

Every other withdrawal attracts a 25% government withdrawal charge, which is more than "losing the bonus". GOV.UK's own example: £800 of your savings plus a £200 bonus makes £1,000; withdraw the lot and the £250 charge leaves you with £750. You get back less than you put in. Keep that asymmetry in mind for the rest of this article.

Where it sits in your ISA allowance

The LISA does not have its own allowance on top of the ordinary one. The £4,000 counts towards the overall ISA allowance, which is £20,000 for the 2026 to 2027 tax year. A UK resident who fills a LISA has £16,000 of ISA allowance left across cash, stocks-and-shares and innovative finance ISAs.

For a US citizen, the allowance is mostly beside the point: every pound inside any ISA is, for US purposes, simply a pound in a foreign account.

The US view: a foreign account, not a shelter

The starting point is citizenship-based taxation. The IRS states that a US citizen abroad is subject to tax on worldwide income from all sources and must report all taxable income under the Internal Revenue Code. The ISA wrapper is a creation of UK law. Nothing in US domestic law adopts it.

The treaty does not help. We are not aware of any provision in the 2001 UK-USA convention that treats an ISA as a tax-favoured account, and Article 1(4) allows each country to tax its citizens by reason of citizenship as if the convention had not come into effect.

In practice, that means:

Cash LISA. Interest is ordinary income on the US return for the year it arises, whether or not you withdraw it. With no UK tax on it to credit, the US tax is a real cost.
Stocks-and-shares LISA. Dividends and gains are US-taxable in the ordinary way, and the holdings decide how painful that is.
Currency. Sterling values and income must be translated into dollars consistently every year.

What is unique to the LISA is the bonus, the lock-in, and the charge.

Stocks-and-shares LISAs and PFICs

Most stocks-and-shares LISAs are built around pooled funds: UK unit trusts, OEICs, and European-domiciled ETFs. From a US perspective, many non-US pooled funds are likely to be passive foreign investment companies (PFICs). Where they are, the default US regime taxes gains and certain distributions harshly, with an interest charge, and Form 8621 reporting can follow for a US person who is a direct or indirect PFIC shareholder.

The mechanics are in our guide to PFIC rules for US investors abroad. The practical point: an ISA wrapper does not stop a PFIC being a PFIC, and several UK funds can mean several Forms 8621 a year, for an account you may not be able to touch without a charge until 60. A cash LISA avoids the PFIC problem entirely, which is often why Americans who want the bonus choose it.

The bonus: a US question with no UK answer

UK guidance treats the bonus as a government top-up inside a tax-free account, and your provider's statement will show it as a credit. It will not tell you what the IRS thinks it is. We treat these questions as open until they have been worked through on the facts:

Is the bonus income at all for US purposes, and if so, what kind? It is a payment from a foreign government linked to your own saving. It does not map neatly onto interest, dividends, or a return of capital.
When does it arise? When the bonus is credited to the account, or only when it is released by a qualifying withdrawal, which may be years later? The answer affects which US tax year, and what exchange rate, applies.
What happens if it is clawed back? If the 25% withdrawal charge later reclaims the bonus, and more, how is that recovery treated on a US return, especially if the bonus was reported as income in an earlier year?
How does it interact with basis? If the bonus is not taxed when credited, what is your US cost basis in the investments it bought?

We do not state a definitive US treatment, because we are not aware of official IRS guidance addressing the Lifetime ISA bonus directly. Model the plausible positions against your own figures before opening an account, then apply one consistently from the first year the bonus is credited. Changing approach halfway through a long-lived account is far harder.

FBAR and Form 8938

A LISA is a financial account outside the United States, and it counts towards the US foreign reporting thresholds alongside your current accounts, savings, other ISAs and pensions.

FBAR (FinCEN Form 114). A US person must file if they have a financial interest in or signature authority over foreign financial accounts whose aggregate value exceeded $10,000 at any time during the calendar year. It is filed electronically with FinCEN, not with the tax return. It is due on 15 April, with an automatic extension to 15 October.
Form 8938. For taxpayers living outside the US, the IRS gives the threshold as more than $200,000 on the last day of the tax year, or more than $300,000 at any time during the year for single filers and married filing separately. It is more than $400,000 or $600,000 respectively for married filing jointly.

Because the FBAR threshold is aggregate, a modest LISA alongside an ordinary current account can easily cross it, and the account stays reportable for as long as it exists.

The trap: opening a LISA, then leaving the UK

The LISA's long lock-in suits a UK resident who stays. For an American in the UK for a posting or a few years, it can become the most expensive part of the account. GOV.UK confirms that if you open an ISA and then move abroad and become non-UK resident, you cannot put money into it, apart from the Crown-employee exception. You can keep it open and it keeps its UK tax relief, and you must tell your provider that you are no longer UK resident. With no further contributions, no further bonus follows.

That leaves a US citizen who has left the UK with two routes, and neither is comfortable:

Keep the account until a qualifying use. For most people who have left, that means reaching 60: potentially decades of FBAR and Form 8938 reporting, and perhaps Forms 8621, on an account they cannot use without a charge.
Withdraw and pay the charge. The 25% charge recovers the bonus and part of your own money. US tax already paid on income inside the account is not refunded, and the US treatment of the charge is part of the open bonus question above.

If you plan to buy a home abroad after leaving, confirm with your provider whether that purchase could meet the first-home conditions before relying on it. If you plan to buy in the UK, our guide to buying a UK home as a US citizen covers the mortgage, currency and US tax layers that sit alongside a LISA withdrawal.

Questions to put to an adviser before opening one

A LISA can still make sense for a US citizen settled in the UK with a realistic first-home purchase in view. Before opening one, we would want answers to these:

How long do you realistically expect to remain UK resident, and how confident are you of a qualifying use before you leave?
Cash or stocks and shares? If stocks and shares, which funds does the provider offer, and would any be PFICs?
What US position will you take on the bonus, from which year, and how will you document it?
What does the account do to your FBAR and Form 8938 position, now and after any move?
If you leave early, what is the modelled cost of the withdrawal charge compared with holding to 60, including US compliance costs?
Does a LISA crowd out something better suited to a US person, such as additional pension contributions, or simply a taxable account in US-reportable investments?

Families weighing UK savings products for children face a similar cross-border mismatch. See our note on Junior ISAs for US citizen children.

How we work on these

We model the bonus, the reporting load and the exit scenarios before you commit, then prepare both returns consistently once the account exists. A licensed CPA or Enrolled Agent reviews and signs off every US filing; the UK side is reviewed by an ACCA-qualified accountant. Our US-UK expat tax service is designed for exactly this kind of question. If you are considering a Lifetime ISA, or already hold one and are planning a move, book a confidential consultation.

This article is general information, not tax, legal or investment advice, and does not create a professional relationship. Nothing here recommends opening, holding or withdrawing from any account or investment. The rules change, so check the figures and conditions against current official guidance and take advice on your own circumstances before you act.

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Reviewed by a CPA / Enrolled Agent. Last updated: 21 September 2026.

Frequently asked questions

Can a US citizen living in the UK open a Lifetime ISA?+

Yes, if they meet the UK conditions. Citizenship is not what matters. GOV.UK states that you must be 18 or over but under 40 to open a Lifetime ISA, and that you must be resident in the UK, or a member of the armed forces or a Crown servant (or their spouse or civil partner) if you do not live in the UK. You can pay in up to £4,000 each year until you are 50, and the government adds a 25% bonus, up to £1,000 a year. The fact that a US citizen can open one does not make it efficient for them. The United States taxes its citizens on worldwide income and does not recognise the ISA wrapper, so the UK tax advantages do not follow the account onto the US return. Model the US side before opening one, not after.

Is the growth inside a Lifetime ISA tax-free for US purposes?+

No. The ISA wrapper exists under UK law, and US law does not adopt it. The IRS states that a US citizen abroad is subject to tax on worldwide income from all sources. Interest in a cash Lifetime ISA, and dividends and gains in a stocks-and-shares one, are therefore reportable on the US return in the ordinary way, generally as they arise, even if nothing is withdrawn. The UK-USA treaty does not change this for a US citizen. Article 1(4) allows the United States to tax its citizens by reason of citizenship as if the convention had not come into effect. Because the UK charges no tax on income inside an ISA, there is no UK tax to credit against the US liability, so the US tax is a real cost.

Is the 25% government bonus taxable in the US?+

This is a genuinely open question, and no UK document will answer it. The UK treats the bonus as a government top-up inside a tax-free account, and your provider will show it as a credit. For US purposes, you have to decide whether it is income at all, what kind of income it is, whether it arises when credited or only when released by a qualifying withdrawal, and how a later clawback through the withdrawal charge would be treated. We are not aware of official IRS guidance that addresses the Lifetime ISA bonus directly. The sensible approach is to model the plausible positions against your own figures and time horizon before opening the account. Then adopt one position, document it, and apply it consistently from the first year the bonus is credited.

What happens to my Lifetime ISA if I leave the UK?+

You can keep it, but you cannot keep building it. GOV.UK confirms that if you open an ISA and then move abroad and become non-UK resident, you cannot put money into it unless you are a Crown employee working overseas or their spouse or civil partner. The account stays open, keeps its UK tax relief, and you must tell your provider you are no longer UK resident. With no new contributions, there is no further bonus. Charge-free withdrawals are limited to a qualifying first-home purchase, reaching 60, terminal illness with less than 12 months to live, or death. Any other withdrawal carries a 25% charge. For a US citizen who has left, the account also stays reportable for FBAR and potentially Form 8938 purposes for as long as it exists.

How much does the Lifetime ISA withdrawal charge actually cost?+

More than the bonus. GOV.UK sets the withdrawal charge at 25% of the amount withdrawn for any withdrawal that is not a qualifying one. Because the charge is calculated on the whole withdrawal, including the bonus, it recovers the bonus and part of your own money. GOV.UK's example: £800 of savings plus a £200 bonus makes £1,000, and withdrawing it all triggers a £250 charge, leaving £750. That is less than the £800 you paid in. For a US citizen, there is a second layer. Any US tax already paid on interest or gains inside the account is not refunded by the UK, and the US treatment of the charge itself depends on how the bonus was treated when it was credited.

Do I need to report a Lifetime ISA on FBAR and Form 8938?+

Usually yes, as part of your wider foreign account picture. The FBAR (FinCEN Form 114) is required where a US person's foreign financial accounts have an aggregate value exceeding $10,000 at any time during the calendar year. It is filed electronically with FinCEN, not with the tax return, and is due 15 April with an automatic extension to 15 October. Form 8938 applies above higher thresholds. For taxpayers living outside the US, the IRS gives these as more than $200,000 on the last day of the year or more than $300,000 at any time, for single filers and married filing separately, and more than $400,000 or $600,000 for married filing jointly. A stocks-and-shares Lifetime ISA holding non-US funds may also bring separate Form 8621 PFIC reporting.

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