What happens to your UK ISA when you move to Argentina?

Your ISA can stay open when you move to Argentina. Its UK tax shelter survives the move, so there is no requirement to sell the investments simply because your address changes. Contributions are a different matter: ordinary subscriptions require UK-resident status, so none are available in a year when you are non-UK-resident throughout. Before paying in during your departure year, especially a year given split-year treatment, confirm with HMRC or your ISA provider that you remain eligible.

Argentina looks at the account through its own tax rules. Once you become Argentine tax resident, interest, dividends, relevant gains and the assets held overseas may have to be reported there. The distinction between keeping a UK wrapper and enjoying an Argentine exemption shapes nearly every decision about the account.

The ISA remains yours, but subscriptions have an end date

HMRC allows an existing cash ISA or stocks and shares ISA to retain its exemption from UK income tax and capital gains tax after its owner leaves. Holdings can generally be sold or switched within the wrapper and cash withdrawn without a UK ISA tax charge. Providers set their own terms for overseas customers, however: an Argentine address may affect trading, access, withdrawals to a UK bank account or a transfer to another provider.

The UK tax year runs from 6 April to 5 April and the overall adult ISA subscription allowance for 2026/27 is £20,000 across ISA types, not £20,000 for each. Ordinary subscriptions require UK-resident status. Whether a departure year with split-year treatment still qualifies is a question for HMRC or your ISA manager, so get written confirmation before you subscribe after leaving. Crown servants abroad and their spouses or civil partners have an exception. UK visits alone do not settle eligibility: the statutory residence test and departure year determine which tax year matters.

A direct ISA transfer between providers preserves the wrapper. Withdrawing the money yourself and paying it into another ISA can instead count as a new subscription, which a non-resident cannot ordinarily make; HMRC does allow specified exceptions, including qualifying flexible-ISA replacement subscriptions to the originating account. Confirm the replacement conditions with your provider; this is not permission for new ordinary savings. The LISA's 25% charge applies to the whole non-qualifying withdrawal, so withdrawing £1,000 leaves £750. A qualifying UK first-home purchase or a withdrawal from age 60 follows different rules.

Where Argentine tax enters the picture

UK residence, Argentine residence and permission to live in Argentina are separate determinations. Argentine tax residents are generally taxed on worldwide income, which can include overseas ISA interest, dividends and relevant realised gains under Ganancias. Foreign-held assets can also come within Bienes Personales, the personal assets tax, subject to the year's thresholds and exemptions and year-end valuation. Argentine tax residence for UK movers explains when that wider tax base starts.

Do not assume a small ISA balance is exempt under Argentine rules; assess the current income and asset exemptions with the other holdings. Nor does a simple count of 183 days alone establish every mover's position. Immigration status, time in Argentina, interruptions to presence and the timing of departure all bear on residence. The applicable year's rules, other assets and income, and the investments inside the ISA then determine what must be declared and what tax may be due.

For a cash ISA, interest is income; the original savings are capital. In a stocks and shares ISA, dividends and fund distributions must be distinguished from sale proceeds and the gain calculated under Argentine rules. Switching investments inside the UK wrapper may itself produce an Argentine disposal. Taking capital out and depositing it in an Argentine bank does not automatically make the full transfer taxable income, but neither does a withdrawal erase tax on interest or a gain already earned. Purchase prices, sale confirmations and exchange-rate records make that distinction possible to document.

The UK–Argentina double tax convention does not extend the UK's ISA exemption to Argentina. If the UK has charged no tax on an ISA return, there is generally no UK tax on that return to credit against Argentine tax. Withholding on income such as dividends from a company outside the UK raises a separate question about source and any available relief.

The useful records start before departure

UK-resident status governs ordinary subscriptions, so the SRT result for each year is the starting point, and HMRC or the provider should confirm how the departure year is treated. A saver planning a move near 5 April needs a UK-residence timeline covering the move date, UK visits and continuing UK ties, assessed under HMRC's statutory residence test. Form P85 can notify HMRC of departure where appropriate, but it does not decide residence. Use HMRC’s residence guidance for that planning; a subscription intended for an eligible year has to be made before the year ends and meet that year’s residence qualification.

Providers need the customer's actual overseas address. Their answers about retaining the account, trading, transferring, making changes and withdrawing funds may differ, as may charges and processing times. A last-minute transfer therefore depends on both the current and receiving providers accepting a non-resident customer. A relative's UK address is no substitute for accurate residence details. A monthly direct debit needs to end before the first UK tax year in which the holder is ineligible; eligibility can be reconsidered if UK residence resumes.

For Argentine returns, annual interest statements and dividend vouchers need to sit alongside transaction histories, acquisition costs, sale records and 31 December valuations. UK ISA statements focused on UK tax may omit the transaction detail an Argentine contador (accountant) needs for Ganancias and Bienes Personales. ARCA, formerly AFIP, is the Argentine tax authority.

Withdrawals are a further practical question. The provider may pay into a linked UK account, after which the owner can compare a GBP-to-ARS transfer quote and the Argentine recipient's requirements. The funding route does not change tax already due on an investment return. Moving money from the UK to Argentina deals with that transfer.

How two tax systems treat the same £100,000

Consider a saver arriving in Buenos Aires in September 2026 with £40,000 in a cash ISA and £60,000 in a stocks and shares ISA. Assume HMRC or the provider confirms they can still subscribe in 2026/27, and that they later become Argentine tax resident; neither date can be inferred from their visa alone. Both accounts can remain open. A £200 monthly ISA direct debit must not run beyond 5 April 2027 if they remain non-UK-resident.

In a subsequent Argentine-resident tax year, suppose the cash ISA earns £1,600 interest, the share ISA pays £900 dividends, and a sale produces a £2,000 gain on the records used in this illustration. The UK ISA tax on those returns is £0. The £4,500 total of income and gain (£1,600 + £900 + £2,000) still requires classification under Argentine valuation, currency and tax rules. A later £5,000 withdrawal of capital for living costs is not automatically another £5,000 of income; the underlying assets may separately matter for year-end foreign-asset reporting. These sterling figures alone cannot establish an Argentine tax bill.

Keeping the account is a choice, not a requirement to cash out

Closing an ISA on departure gives up an existing UK shelter which cannot simply be recreated through new subscriptions while non-resident. Keeping it preserves that shelter, though Argentine tax, account costs and currency exposure may change the overall benefit. Accurate provider records and a clear history of gains are more useful than assuming either that the UK exemption works worldwide or that every withdrawal is taxable.

Junior ISAs and LISAs have their own eligibility and withdrawal rules; an adult ISA's subscription timetable cannot be assumed to cover them. Pensions and UK rental income also follow different rules. A holder drawing from a SIPP can use the UK SIPP guide instead of applying ISA rules to pension income.