United Kingdom & Portugal: UK ↔ Portugal: The IHT trap that follows you south
Portugal abolished inheritance tax twenty years ago. But that does not mean British nationals who retire to the Algarve have escaped the UK's reach. This guide explains the domicile trap, the absence of a bilateral inheritance treaty, the forced heirship interaction, and when planning is most urgent.
UK ↔ Portugal: The IHT trap that follows you south
Portugal abolished inheritance tax twenty years ago. But that does not mean British nationals who retire to the Algarve have escaped the UK’s reach.
Reading time: 8 minutes · Last reviewed: 2025
Two systems pulling in opposite directions
Portugal operates one of Europe’s most benign succession tax environments. There is no inheritance tax between direct family members — spouses, children, grandchildren, parents and grandparents are entirely exempt. Everyone else pays a flat 10% stamp duty on Portuguese-located assets, and nothing on assets held outside Portugal.
The UK operates one of the most persistent systems: inheritance tax follows UK domicile, not UK residence. A British national who moves to Portugal and lives there for twenty years may still be treated as UK-domiciled for IHT purposes — meaning their worldwide estate, including the Portuguese villa, is potentially subject to UK tax at 40% above the nil-rate band.
Understanding the interaction between these two systems is the first essential step for any British family with a foothold in Portugal.
UK IHT is governed by domicile — a concept based on long-term intent and connection, not simply where you live. Portuguese succession tax is governed by the location of assets and the residence of the deceased. The two systems use entirely different tests, which means the same estate can be in scope for both simultaneously — or for neither. Working out which applies to a given family requires detailed analysis.
What every UK-Portugal family needs to understand
The UK IHT clock runs on domicile, not residence
Moving to Portugal does not automatically sever UK domicile. Under the post-April 2025 long-term residence rules, you need to have been non-UK-resident for a sustained period before UK worldwide exposure falls away — and even then it tapers gradually, not immediately. Many British retirees in Portugal remain within the UK IHT net for years or even decades after departure.
Portugal has no inheritance tax — for direct family
Portuguese stamp duty (Imposto do Selo) at 10% applies only to assets located in Portugal and only when passed to anyone outside the direct family line. Spouses, children, grandchildren, parents and grandparents pay nothing. Notably, siblings and unmarried partners are not direct family in the Portuguese sense — they pay 10% on Portuguese assets.
No bilateral inheritance treaty exists
The UK and Portugal have a double taxation treaty updated in September 2025, but it covers income and capital gains — not inheritance. For succession purposes, there is no bilateral mechanism to allocate which country taxes first or eliminate overlap. UK unilateral relief may help offset Portuguese stamp duty paid against UK IHT, but it does not eliminate the risk of dual exposure.
Brussels IV gives you testamentary freedom — not tax freedom
UK nationals resident in Portugal can elect to have English, Scottish or Northern Irish law govern succession — overriding Portuguese forced heirship rules. This must be done explicitly in a Portuguese will. Crucially, Brussels IV has no effect on tax liability. A Brussels IV election changes who inherits; it does not change what taxes are owed on the inheritance.
Forced heirship and the Brussels IV solution
Portuguese succession law reserves a mandatory share of the estate — the legítima — for protected heirs. The reserved portion varies by family structure: with a spouse and two or more children, two-thirds of the estate is automatically allocated to them. The spouse must receive at least one quarter. These rules apply based on the deceased’s habitual residence at death.
UK nationals can override this by making an explicit election in their Portuguese will choosing English (or Scottish or Northern Irish) law under Article 22 of the EU Succession Regulation (Brussels IV). Portugal continues to apply Brussels IV to UK nationals despite Brexit. The election must be made during the person’s lifetime — heirs cannot make it after death.
Portugal takes a traditional view of family for both succession and tax purposes. Unmarried partners — even those in long-term relationships — have no automatic inheritance rights and are not treated as direct family for stamp duty purposes. Without a will and a Brussels IV election, a surviving partner who is not a spouse could be exposed to significant stamp duty and may receive less than intended from the estate.
What the end of NHR means for UK families
The original Non-Habitual Resident (NHR) programme closed to new applicants in January 2024, replaced by the narrower IFICI programme targeting scientific research and innovation professionals. The NHR regime, which attracted tens of thousands of British retirees to Portugal with its favourable income tax treatment, has no bearing on inheritance or succession tax — those are governed entirely by the stamp duty rules and the UK IHT regime described above.
However, the end of NHR has a significant planning implication: some UK nationals who relocated to Portugal under NHR may find that the tax calculus of their overall position has changed substantially once their ten-year NHR period expires. This includes how UK pension income is taxed in Portugal — not inheritance, but part of the same overall picture that a cross-border adviser needs to consider.
UK pensions: a new layer of complexity from April 2027
From April 2027, unused UK pension pots are to be brought within the UK IHT estate. Previously, most private pensions fell outside the estate and passed free of IHT. This change is material for UK nationals with significant pension savings living in Portugal, because it means assets that were once outside the UK IHT calculation will now be included.
The interaction between Portuguese stamp duty on Portuguese-located assets and UK IHT on the worldwide estate (potentially including pensions) represents a new layer of complexity that was not present for families who planned their affairs before this change.
Planning triggers for UK-Portugal families
Where you need a specialist
This guide explains the principles. It cannot tell you whether you have acquired a Portuguese domicile of choice, how long it will take for UK IHT exposure to taper under the post-2025 long-term residence rules, whether your existing wills are coordinated correctly, how your specific pension structure interacts with the April 2027 reform, or whether your estate would be subject to double taxation — and if so, how unilateral relief would operate in practice.
These are questions for a qualified cross-border estate specialist with experience in both UK and Portuguese law — ideally one who can advise on both the succession and tax dimensions together, since they are connected.
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Frequently Asked Questions — UK & Portugal Inheritance
Does Portugal have inheritance tax?
Is there a UK–Portugal inheritance tax treaty?
Does moving to Portugal under the NHR regime affect UK inheritance tax?
What is the domicile trap for UK nationals in Portugal?
Are UK pension funds exposed in the Portugal corridor?
What should I do first if I have assets in both the UK and Portugal?
These FAQs are for general educational purposes only. They do not constitute legal, tax or financial advice. Laws change and individual circumstances vary significantly. Always consult a qualified cross-border estate specialist before making decisions.
Ready to map your specific situation?
This guide explains the principles. The simulator helps you understand how they apply to your residency, assets, and family structure.