When an estate includes overseas assets, executors can find themselves facing tax demands in more than one country. Many assume relief is only available if the UK has a treaty with the other jurisdiction. In fact, the UK’s treaty network for Inheritance Tax (IHT) is limited, which is exactly why unilateral relief can be so important in cross-border estate administration.
Why overseas assets can create a double tax problem
Cross-border estates rarely announce themselves at the outset. The issue often emerges only once the administration is under way: a property abroad, an overseas account or a foreign tax authority bring a second tax system into play. At that point, the concern is no longer simply administrative. It is whether the same asset may be taxed twice.
For executors, that can be deeply unsettling. They may already be dealing with domestic reporting deadlines, valuations and family expectations. Adding a foreign tax charge can create the impression that the estate has wandered into specialist territory unexpectedly. Often, that impression is correct. Cross-border estates are not just UK estates with extra paperwork. They raise distinct questions about where assets are treated as situated, which country has taxing rights, and whether the UK will give credit for tax paid elsewhere.
The UK’s limited network of inheritance tax treaties
This is why unilateral relief deserves far more attention than it usually receives. There is limited scope for ‘treaty relief’: only 6 countries have a double tax treaty for IHT with the UK: South Africa, the USA, the Netherlands, the Republic of Ireland, Sweden and Switzerland. There are a further 4 treaties in existence for the predecessor to IHT, estate duty.
That is a limited network by any measure. Even where a treaty does exist, it may not resolve every issue cleanly. If executors assume that treaty protection is the only route to relief, they may conclude too quickly that a double tax burden is unavoidable. In practice, that may not be correct.
Why unilateral relief is often the real answer
In practical terms, unilateral relief can reduce a UK IHT charge where foreign tax has also been imposed on the same overseas asset on death. Whether relief is available depends on the relationship between the two charges and on the nature of the foreign tax involved. The position also turns on how the asset is treated for UK situs purposes. Even where relief is available, it will not shelter more than the UK tax attributable to that asset.
Common mistakes for executors
The most common mistake is to assume that the mere existence of foreign tax means relief will necessarily follow in the UK. In reality, executors need to examine whether the charge is capable of being credited at all, how the asset is characterised for UK purposes, and where it is treated as situated under UK law.
Why early specialist advice can reduce risk and cost
The value of specialist advice in a cross-border estate is not simply that it identifies a relief. It is that it identifies the right route early enough to shape the administration properly.
Where an estate includes overseas assets, the key questions should be asked at the outset are:
- Is there a treaty at all? If there is, does it fully solve the problem?
- If there is not, can unilateral relief reduce the UK charge? How should the asset be characterised and where is it situated for UK purposes?
Those questions directly affect the amount of tax the estate may ultimately bear.
In that sense, unilateral relief is more than a technical provision. It is often the dividing line between accepting double tax as inevitable and recognising that the estate may be entitled to meaningful credit in the UK. In a tax regime with a limited treaty network, that can make a very significant difference.
If you are acting as executor of an estate with overseas assets or advising on a UK estate with a foreign element, early advice can be crucial. Identifying the scope for treaty relief or unilateral relief at the outset can reduce tax leakage, avoid unnecessary delay and help protect executors from preventable risk. If you would like to discuss a cross-border estate, get in touch with our wills and estate planning lawyers who can help you assess the exposure and identify the most effective route through the administration.
Contributor
Associate
