Last Updated on 27th September 2026
Assuming that the tax advantages linked to Individual Savings Accounts (ISAs) will continue to apply when expats relocate is a common misconception, because ISA tax advantages arise under UK legislation and are not generally replicated under Portuguese tax rules.
ISAs remain a tax-efficient product for British taxpayers. However, when expats relocate to Portugal, that tax-free status isn’t replicated. Instead, interest, dividends and investment gains realised within an ISA may become taxable according to their classification under Portuguese rules.
Understanding how UK-based savings accounts are taxed and how the rules apply before relocating can help expats avoid unexpected tax liabilities and often highlight opportunities to reassess how savings and investments are structured.
Why Your ISA May No Longer Be Tax-Free in Portugal
There is no rule that prohibits British nationals from keeping an ISA when they move to Portugal. Keeping an ISA may remain appropriate in some circumstances, but its tax treatment and suitability should be reviewed as part of the individual’s wider financial plan.
The tax-advantaged status of an ISA is built into UK legislation. The implication is that this treatment is not automatically recognised by other countries, including Portugal, and that this applies to all types of ISAs and many similar products, including:
- Cash ISAs, which provide UK tax-free interest, with the £20,000 annual adult ISA subscription limit applying across all ISAs held by an individual.
- Stocks and Shares ISAs, which act as tax-efficient investment wrappers. Subscriptions also count towards the same £20,000 annual adult ISA limit and investments carry the potential for higher long-term growth alongside investment risk.
The important point is that the advantages attached to these products are created by UK law. Once you become a Portuguese tax resident, those advantages won’t be recognised in the same way.
One aspect that often catches expats out is that the tax treatment of one particular product should never be considered in isolation. Keeping an ISA may still be appropriate in some circumstances, particularly where it forms part of a long-term investment strategy.
However, once UK tax advantages no longer apply, it becomes increasingly important to assess whether the structure of this savings account, and all other products in your portfolio, continues to align with your residency status, retirement plans and overall financial objectives.
This does not necessarily mean an ISA should be withdrawn, sold or restructured when moving to Portugal. Selling investments within an ISA does not ordinarily give rise to UK Capital Gains Tax, but withdrawing the proceeds and reinvesting them outside the ISA means that future income and gains on those investments will no longer benefit from the UK ISA tax treatment.
Portuguese tax may arise separately on income or gains realised within an ISA, depending on how they are classified under Portuguese rules.
Decisions about whether to retain, transfer or restructure an ISA should be considered in the context of each individual’s financial and tax position.
Other Savings and Investment Products Impacted By a Portuguese Relocation
Although ISAs are common examples, they’re far from the only financial products that receive different tax treatment after moving overseas. Other savings accounts and investments may be categorised and taxed differently once you become a Portuguese tax resident.
This is why reviewing individual products is rarely sufficient.
The interaction between savings accounts, investment portfolios, pensions, and other sources of income can influence an expat’s overall tax position, making it worthwhile to consider how these arrangements work together after becoming a resident in Portugal.
Expat savings and investment portfolios will also be subject to different tax rates. For example, in the UK, dividend income held outside of an ISA is normally taxed at a basic rate of 10.75%, a higher rate of 35.75%, and an additional rate tax band of 39.35%, after the £500 dividend allowance and a Personal Allowance of £12,570, depending on other income.
In Portugal, most dividend and interest earnings are subject to a 28% flat tax rate. Portuguese taxpayers can opt to pay tax on dividends at the marginal income tax rates ranging from 12.5% to 48%, plus solidarity taxes where applicable, but the benefits of doing so will depend on each person’s circumstances.
Scenarios in Which Double Taxation Relief May Help Mitigate Tax Obligations
Although Portugal and the UK have a Double Taxation Treaty (DTT) intended to prevent the same income from being taxed twice, this doesn’t necessarily mean income will be taxable in only one country.
Depending on the source of the income and the individual’s tax residency, foreign tax credits or other reliefs may be available, making it important to understand how the rules apply before assuming overseas income will retain its UK tax treatment.
While expats are advised to seek advice on how the DTT will apply to their affairs and how to claim available credits, this won’t always help reduce the tax burden arising from gains, returns, or dividends originating from a UK ISA.
Because the tax advantages of an ISA don’t exist in Portugal, income and realised gains arising within an ISA may be subject to Portuguese tax according to their classification and the applicable Portuguese rules. Because no corresponding UK tax may have been paid, a foreign tax credit may not be available.
Reviewing UK Savings for Expats Following the End of the Portuguese NHR Scheme
Regardless of whether British expats moving to Portugal hold an ISA or a similar tax-advantaged product, many may need to reassess the value and efficiency of their broader portfolios.
Expats might have either already enrolled in the Non-Habitual Resident (NHR) regime, or intended to apply for the scheme on arrival, with various tax benefits and allowances for eligible non-Portuguese taxpayers.
Now that this scheme has closed, expats who had expected to benefit from the NHR, or whose existing benefits are approaching the end of their eligibility period, should revisit the values and tax positions of their UK savings and investment income, as well as all other aspects of their portfolios.
This is also relevant for expats who may wish to consider whether they meet the criteria for the newer IFICI (Tax Incentive for Scientific Research and Innovation) programme. Eligibility for IFICI is limited, and qualifying for the regime does not automatically mean income or gains arising within a UK ISA will be exempt from Portuguese tax.
The treatment of foreign-source income may depend on the nature of the income and the applicable Portuguese rules. Specialist Portuguese tax advice is necessary before assuming that IFICI will protect the tax treatment of an existing ISA.
How to Manage Concerns About the Impacts of Moving to Portugal on Your UK Savings
Reviewing your savings, investments and retirement arrangements before or shortly after becoming a Portuguese tax resident can help you understand how local tax rules may affect your financial plans.
This has become particularly important following the closure of Portugal’s former Non-Habitual Resident (NHR) regime. Whether you had expected to qualify for NHR or your existing benefit period is approaching its end, now may be an appropriate time to review how your UK savings and investment income will be treated going forward.
Should you be planning a move to Portugal or are already living there and would like to discuss the wider financial planning implications, a Chase Buchanan adviser can help review the financial-planning implications of retaining or changing an ISA. Advice on Portuguese tax treatment should be obtained from a suitably qualified Portuguese tax professional.
© Chase Buchanan Private Wealth Management.
Chase Buchanan Ltd is authorised and regulated by the Cyprus Securities and Exchange Commission with CIF Licence 287/15 and offers its services in the EU on a cross-border basis as per the provisions of MiFID.
Chase Buchanan Insurance Services, Agents & Advisors is authorised and regulated by the Cyprus Insurance Companies Control Service with License No 6883 and offers services in the EU on a cross-border basis as per the provisions of the Insurance Distribution Directive (IDD).
Investing in financial instruments involves risk and may not be suitable for all investors. The value of investments may go up as well as down and past performance is not a reliable indicator of future results. You may lose part or all of your invested capital.
*Information correct as at September 2026
