London continues to attract significant interest from US buyers, drawn by its stability, global reputation and relative value compared with other international luxury markets. Yet behind the appeal of a Prime Central London acquisition lies a web of legal, tax and estate-planning considerations that differ markedly from those in America.
To help unpack the realities of buying property across two jurisdictions, we asked Emma Gillies, a Private Client Partner and high-net-worth specialist at UK law firm, Forsters. From inheritance tax exposure and ownership structures to cross-border estate planning and family law considerations, Emma explains why early advice is essential to ensuring a London property purchase delivers the investment and lifestyle benefits buyers expect.
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London’s enduring appeal to American buyers is not difficult to understand. A combination of cultural familiarity, a strong rule of law, world-class education and at least in relative terms, perceived value in prime property continues to draw high-net-worth US families across the Atlantic.
Even amid economic headwinds and shifting tax regimes, demand from the United States has proven resilient, with Americans now among the leading overseas purchasers of residential property in Prime Central London.
Alongside this opportunity, however, sits a more nuanced legal and tax landscape. For American buyers, acquiring property in London is not simply a transactional exercise.
It involves navigating two sophisticated and often conflicting jurisdictions which interact in complex ways. With the right advice, these complexities can be managed effectively, but early planning is key to avoiding unexpected outcomes.
The price of entry – what US buyers don’t see coming
At the most immediate level, transaction costs alone can come as a shock. UK stamp duty land tax (SDLT) rates for residential property have steadily increased, with additional surcharges layered on top for non-residents and owners of multiple properties.
As a result, some buyers now face effective rates as high as 19%, a figure that can materially alter the economics of a purchase. These costs are compounded by wider market pressures – notably rising borrowing costs and restrictions on mortgage deductibility – which further diminish net returns for investors.
The need for careful planning becomes more pronounced once ownership is established. Perhaps the most significant legal hurdle is exposure to UK inheritance tax (IHT).
Unlike the US federal system, which currently allows up to US $15 million to pass free of estate tax, the UK imposes IHT at a flat rate of 40% on UK-situated assets above a relatively modest nil-rate band of £325,000.
For US buyers accustomed to far more generous thresholds, this represents a fundamental shift in estate planning assumptions.
Why old planning routes no longer work
Historically, wealthy international buyers relied on offshore corporate structures to shield UK property from IHT. That strategy has largely been dismantled. Since 2017, shares in non-UK companies deriving value from UK residential property are themselves subject to IHT, closing a long-standing planning route.
The result is that most US buyers must now confront the reality of direct exposure, with few effective mitigation tools available.
Mortgage structuring can offer some relief. While borrowing can reduce the taxable value of an estate for IHT purposes, accessing suitable lending from UK institutions is not straightforward for US borrowers.
Banks often require income denominated in sterling and paid into UK accounts, creating practical barriers for internationally structured wealth. More complex still are the potential US tax consequences of certain mortgage products, particularly flexible arrangements, which can trigger unintended liabilities on the US side.
These cross-border differences extend into nearly every aspect of ownership. A striking example is the treatment of the family home. While UK rules provide full capital gains tax (CGT) relief on a principal residence, US tax law limits its equivalent exemption to $250,000 per individual, effectively negating the UK relief on gains over that amount.
Consequently, US purchasers might look at placing the property in the name of a non-US spouse, but this strategy can be hindered by US gift tax rules.
Administrative matters should also be managed proactively. The question of wills illustrates this well. Without an English will to cover the UK property, executors may face additional procedural hurdles in obtaining probate, including the need for affidavits of foreign law and associated delays.
Therefore, with the right estate administration framework in place, these processes can be handled more simply at a time when certainty is most valuable.
Trusts, pre-nups and family law divergence
Trust structures, often favoured in US planning, require careful consideration in a cross-border context. In the UK, trusts holding residential property can be subject to periodic inheritance tax charges and may still be treated as part of the settlor’s estate in certain circumstances.
Furthermore, in family law contexts, trusts may be scrutinised as potential financial resources or even altered by courts in divorce proceedings – a stark contrast to their generally robust status in the United States.
This divergence in legal philosophy extends further into family law. Pre-nuptial agreements, widely enforceable in the US, are not automatically binding in England and Wales. Instead, their effectiveness depends on fairness and procedural safeguards, including independent legal advice and full disclosure.
For relocating American families, this subtle but crucial difference can have significant implications for asset protection.
Taken together, these considerations underline an important point. Buying property in London as an American is not simply a financial decision, but a cross-border legal exercise requiring careful orchestration. The risks are not abstract. The objective is not to avoid complexity, but to understand it and plan for it with confidence.
The reasons to remain optimistic
Encouragingly, despite these hurdles, the flow of US capital into London property remains robust. The city’s enduring strengths – transparency, stability and global prestige – continue to outweigh the complexities for many buyers.
The focus should be on preparation rather than precaution. By engaging the right legal and tax advisers early, buyers can navigate the process smoothly, avoid unexpected costs and ensure that their investment works as intended.
In this market, it is thoughtful planning, as much as the property itself, that ultimately determines whether an American buyer’s London ambition proves to be a sound investment or an expensive lesson.
More information about Forsters LLP and the how they advise high-net-worth property buyers and sellers globally, visit www.forsters.co.uk
