Foreign Direct Investment (FDI) has long been regarded as a cornerstone of economic development, capital flow, and cross-border economic integration. For developed economies like the United Kingdom and the United States, FDI serves a dual role. It not only attracts international capital to domestic markets but also fosters transnational cooperation, promotes innovation, creates employment, and enhances productivity. Simultaneously, the influx of FDI presents complex challenges related to taxation, regulatory compliance, and legal sovereignty. In this chapter, we explore the evolving landscape of FDI regulation and taxation in the US and UK, conducting a comparative legal and financial analysis while contextualizing policy responses to globalization, tax base erosion, and international treaties.

This exploration is especially relevant in the post-Brexit and post-COVID world, where both nations are renegotiating their economic priorities, fiscal policies, and global positioning. Multinational corporations (MNCs) frequently route investments through multiple jurisdictions, often using holding companies, Special Purpose Vehicles (SPVs), and hybrid entities. Governments, in turn, respond with tax reform, anti-avoidance legislation, and foreign investment screening mechanisms to strike a balance between openness, national security, and tax justice.

The goal of this chapter is to examine the legal and financial frameworks governing foreign investment taxation in both jurisdictions, trace the evolution of these policies, and assess their implications for multinationals, sovereign tax bases, and legal predictability.

 

3.1.1 Foreign Direct Investment Legal Framework: UK vs USA

3.1.1.1 United Kingdom: Openness with Oversight

The United Kingdom has long positioned itself as one of the most attractive jurisdictions for foreign investment, combining liberalized capital markets, a predictable legal system, and globally integrated financial infrastructure. Since the Thatcher-era reforms of the 1980s, successive governments have embraced an open-door approach, promoting foreign direct investment (FDI) as a driver of economic growth, job creation, and technological innovation.¹ Today, the UK remains one of the largest recipients of inward FDI in Europe, despite Brexit-related uncertainties.² However, this openness has increasingly been balanced with national security concerns and regulatory safeguards to ensure that foreign investment aligns with the public interest.

Historically, the UK pursued a liberal policy relative to other progressed economies and placed few restrictions on the inflows of capital. The Enterprise Act of 2002 initially allowed the government to monitor mergers and acquisitions on the basis of national security with limited powers largely treated as nonexistent yet the global economic crisis of 2008 and the ensuing emergence of state-backed investors, especially those of the emerging economies, were enough to raise questions on the strategic consequences of foreign ownership in strategic industries.

The 2016 Brexit referendum also altered the situation, with the UK having to re-strategize its economic policies to attract and maintain foreign capital, rather than relying on the EU common market. The city of London remained a financial hub of the world yet the government came up with new policies to overcome economic sovereignty, technological competitiveness, and geopolitical threats.

3.1.2 The National Security and Investment Act 2021

The most significant development in recent years is the National Security and Investment Act 2021 (NSIA), which established the Investment Screening Unit (ISU) within the Department for Business and Trade. The Act created a comprehensive system for reviewing transactions that could pose risks to national security, representing the most far-reaching reform of the UK’s investment screening regime in decades.

The Act requires mandatory notification for acquisitions in 17 sensitive sectors, including artificial intelligence, advanced robotics, quantum technologies, military dual-use goods, and critical energy infrastructure.The government may block, impose conditions, or unwind transactions deemed harmful to national security. Unlike the earlier regime, the NSIA applies retroactively for up to five years where risks are identified.

Even though the law strengthens government control, it is structured in a way that it does not destroy investor confidence. The official statistics indicate that the great majority of transactions are cleared non-interventionally, which sends the message that the UK is open to business.

3.1.3 Corporate Regulation and Governance

In addition to the act of screening investments, foreign investors are bound to the Companies Act 2006, the main corporate law of UK. The Act is applicable to both the foreign and domestic companies registered in the UK and it sets the requirements concerning the incorporation, the responsibilities of the directors, rights of the shareholders and financial reporting. To give an example, directors have to act in good faith, in the good of the company to benefit the shareholders and to act in the best interest of the wider stakeholder.

The UK Corporate Governance Code, updated in 2018, supplements this framework by requiring listed companies to adhere to best practices in board independence, executive remuneration, and shareholder engagement.  Its “comply or explain” mechanism grants companies flexibility but enforces accountability through disclosure obligations. Foreign investors seeking to list on the London Stock Exchange must align with these standards, ensuring consistency in governance practices across ownership types.

3.1.4 Post-Brexit Landscape

Base Erosion and Anti-Abuse Tax (BEAT):

The Base Erosion and Anti-Abuse Tax (BEAT) was a new tax that was implemented in response to the apprehension that multinational enterprises (MNEs) were durably weakening the US tax base by means of aggressive profit-shifting activities. BEAT is treated as a minimum tax imposed on corporations whose gross receipts are averagely more than 500 million a year and have large deductible payments to foreign affiliates. It also focuses mainly on large multinational organizations who are able to reduce their US taxable income by making payments- royalties, interests, and management fees- outside the United States and into low-tax jurisdictions. In contrast to the enforcement of transfer pricing under IRC SS482 that involves a detailed examination of whether intercompany payment is reflective of an arm length price, BEAT is more of a formulaic based approach. It levies a minimum tax amounting to 10 percent of modified taxable income, without deduction of base erosion payments, so that highly aggressive tax planning will fail to fully shelter profits against US taxation.

The introduction of BEAT brought a major change in the US war strategy against erosion of bases. Where prior measures were based upon each case being adjusted case-by-case, and the judicial doctrine that the substance of the transaction should be applied instead of its form, BEAT is an automatic process that would punish overreliance on related-party payments. Its expanse portrays increasing anger regarding the shortcomings of the conventional transfer pricing enforcement, particularly where intangible assets are quite common in the industries. As an illustration, intercompany licensing is a common arrangement used by digital companies to bring the profits back to the US and then transfer them to subsidiaries in jurisdictions where there is a low or zero tax. BEAT decreases the incentive to use such strategies directly, by disallowing deductions on such payments in the event they are over a specified limit. Critics on the other hand point to the fact that BEAT has the risk of taxing bona fide commercial transactions and in cases where payment has already been taxed in the recipient jurisdiction, a second taxation would occur.

3.1.5 Foreign Investor implications and Comparative implications.

BEAT has brought in yet another level of complexity and compliance costs to foreign investors. International firms whose headquarters are located outside the US but with American affiliate companies have to reconsider their cross-border payments and whether they can fall under the definition of base erosion and, accordingly, modify their tax planning. This poses specific problems to international banking, insurance, and pharmaceutical companies, which usually depend on bank-to-bank financing and the licensing of intellectual property rights. Moreover, since BEAT usually does not grant foreign tax credits on taxes paid in a foreign country, corporations are at the risk of effective foreign taxation, which degrades the appeal of the US investment in capital-intensive or IP-heavy industry. Other companies have reacted by reorganizing supply chains, re-defining intra-group service contracts or capitalizing subsidiaries so as to minimize dependency on deductible payments.

BEAT is a unilateral US action, which in the global scenario is found to be incompatible with multi-lateral initiatives like the OECD Base Erosion and Profit Shifting (BEPS) project. Whereas OECD has focused on harmonized rules and arm-length pricing, BEAT has imposed a minimum tax regardless of what has been agreed on internationally. This has caused other trading partners to criticize BEAT as being contrary to the principles of past treaties, especially the ban on discriminatory taxation of cross-border transactions. However, policy-wise BEAT reemphasizes the US intent to shield its domestic tax base against aggressive planning and to deter the use of intangible-intensive schemes that drain profits overseas.

Moving forward, the Biden administration and Congress have discussed BEAT reform, including substituting it with the Stopping Harmful Inversions and Ending Low-Tax Developments (SHIELD) proposal, which would be closer to the global minimum tax proposals in the OECD under Pillar Two. Regardless of whether BEAT will be substituted, the action puts into the limelight the conflict between the need to provide a favorable investment environment and protection against tax base erosion. The US market is still profitable to foreign investors, but the introduction of BEAT will mean that profitability will be balanced with increased compliance costs and a more difficult anti-avoidance environment. Finally, BEAT can be viewed as the general trend of developed economies switching to minimum tax regimes in order to meet the challenges of globalization, digitalization as well as more mobile capital.

3.1.6 Equal Treatment in Taxation

UK has a non-discriminatory tax system to foreign investors. The same corporation tax regulations apply to both domestic and foreign-owned entities, as long as they are registered entities in the UK, recent reforms, including the introduction of the 25% main rate of corporation tax as of 2023, have placed an additional burden on businesses, but the UK still presents itself as a favorable place to conduct business due to high tax predictability, a large number of treaties, and an effective dispute resolution system.¹⁴

3.1.7 Investor Protections and Transparency

A key feature of the UK system is the emphasis on investor protections and transparency. The Companies Act requires disclosure of beneficial ownership through the People with Significant Control (PSC) register, reducing opportunities for opaque structures.Furthermore, the UK is a signatory to numerous bilateral investment treaties (BITs), which provide protections such as fair and equitable treatment, protection against expropriation, and access to international arbitration.

The emphasis on transparent governance has enhanced investor confidence, though critics argue that increased regulatory burdens, combined with Brexit uncertainty, may reduce the UK’s competitiveness compared to EU markets.

The UK has managed to sustain its reputation as an attractive destination for foreign investment by combining an open market philosophy with a robust legal and regulatory framework. The National Security and Investment Act 2021 represents a clear shift towards safeguarding national interests in an era of geopolitical uncertainty, while the Companies Act 2006 and the UK Corporate Governance Code provide transparency and accountability for both domestic and foreign-owned enterprises.

In the future, the UK will have to strike a balance between national security and economic openness, especially in such emerging fields as artificial intelligence, biotechnology, and renewable energy. However, the liberal economic policies, well-developed corporate law system and the image of legal certainty remain what make it one of the most desirable investment destinations in the world.

3.1.7.1 United States: Security-First Approach

The United States remains one of the world’s most attractive destinations for foreign direct investment (FDI), with a combination of vast consumer markets, technological leadership, and relatively liberalised capital mobility.¹ At the same time, the US adopts a more guarded and security-conscious approach to foreign ownership compared with the United Kingdom. While welcoming capital inflows, the US has historically balanced openness with concerns about national security, technological competitiveness, and economic sovereignty.² The regulatory environment, therefore, reflects a dual character: promotion of investment opportunities through incentives, alongside a robust system of screening and restrictions in sensitive sectors.

3.1.7.2 CFIUS and the Expansion of Review Powers

The Committee on Foreign Investment in the United States (CFIUS) is the foundation of the foreign investment screening regime of the US. It is an interagency committee with US Treasury Department as the chair and the representatives of Departments of Defense, State, Homeland Security among others. CFIUS can review, prevent or require foreign acquisitions which can cause risks to national security.

In 2018, the Foreign Investment Risk Review Modernization Act (FIRRMA) increased the jurisdiction of CFIUS. In the past, CFIUS was primarily concerned with those transactions that give control of a US business. However, under FIRRMA, CFIUS now has the ability to review non-controlling minority investments by businesses that deal with critical technologies or critical infrastructure or sensitive personal data. This growth indicates the increasing anxieties with regards to foreign investment especially Chinese in the sectors that are at the heart of national security and future technological superiority.

Interestingly, FIRRMA also came up with a mandatory filing rule on selected transactions of critical technology businesses. This was a change to the previously voluntary notification regime, providing greater predictability, but raising compliance costs on foreign investor.

In addition to CFIUS, the US has sectoral prohibitions on foreign investment. The Communications Act 1934 limits foreign ownership of broadcast licenses to 25 percent except where the Federal Communications Commission (FCC) grants a greater limit. In the same way, the Defense Production Act, and similar laws restrict foreign access to the defense procurement and supply chains reflecting national security sensitivities.

Other industries, including the public utilities, air transport and maritime, are also restricted by statutes like the Merchant Marine Act 1920 (Jones Act) which mandates that domestic shipping be done by the US built, owned and operated vessels. In telecommunications, joint interagency reviews In telecommunication, CFIUS and a specially constituted interagency working group called Team Telecom conduct national security reviews.

Such restrictions establish a space in which, in contrast to the UK, foreign investors will need to by-pass sector-specific regulatory obstacles, on top of the broad compliance with the corporate and securities laws.

3.2 Promotion of FDI: Federal and State-Level Incentives

In spite of its protectionist policy, the US actively encourages FDI. The Selects program, which is managed by the Department of Commerce, promotes the US as an investment destination, facilitates the process of foreign companies to navigate regulatory procedures, and links investors and opportunities at the state level.

On the state level, the governments are highly competitive to attract FDI through tax credits, grants, training of the workforce and providing of infrastructure support. To illustrate this, a state of Nevada incentives package of 1.3 billion dollars favored Tesla by Gigafactory, which demonstrates the competitive federalist approach to attracting investment.

Foreign investors are also assisted by bilateral investment treaties (BITs) and trade agreements which offer them legal protection including national treatment, most-favored-nation (MFN) and rights to arbitration. Despite US being increasingly wary when it comes to negotiating new BIT, its wide net of treaties still supports investor confidence.

3.2.1 Comparative Observations with the UK

Compared to the UK where the screening of investment has been recently empowered by the National Security and Investment Act 2021, the US regime has long institutionalized the high-quality scrutiny via CFIUS. Unlike the UK which focuses on the transparency and equal treatment after they are incorporated within the country, the US focuses on the pre-acquisition checks and sector-related limitations, especially in those areas that are associated with national security and competitiveness in the technological field.

Using the example of an UK based company investing in telecommunications in the US, the UK would have limitations under the Communications Act, and the American investor in the UK would not have as many obstacles (excepting regulatory licensing requirements). This depicts the inequality in openness to investments whereby the US is more protective of the strategic sensitive sectors.

3.2.2 Modern Day Problems and International Introspection.

The emergence of geo-economics rivalry with China has heightened the questions about foreign investments in the US. Sales of semiconductors, artificial intelligence and biotechnology are practically routinely reviewed now. The Biden administration has also gone further to extend the outbound investment screening proposals, indicating the US is likely to regulate not only the inbound but also the outbound flows to sensitive sectors as well.

Critics believe that this will discourage positive capitals inflows, particularly in capital intensive sectors such as infrastructure and manufacturing, as the US invests law becomes stricter. Proponents, though, argue that such measures are necessary to safeguard the national security and technological advantage, especially, in the face of worldwide rivalry on the essential technologies.

The future of US FDI policy will likely entail a trade-off between openness and resilience so that the economy becomes an attraction to global investment policies as well as protecting national security interests.

The United States is a paradise in dealing with foreign investment: on the one hand, it has one of the most open and dynamic economies in the world, on the other hand, it has some of the most restrictive screening and sectoral restrictions amongst the developed economies. With the help of FIRRMA 2018, CFIUS has revolutionized the world of investment by expanding the scope of its control to non-dominant ownership of sensitive industries. This, together with legal obstacles to defense, telecommunication and utilities, makes the US a more cautious place to be compared to the UK.

However, bountiful state level incentives, federal promotion programs, and the sheer size of the US market still keep drawing record FDI. In the future, the key dilemma will be to achieve a compromise between being open to foreign capital and finding a way to accommodate the justifiable security and geopolitical interests.

3.3 Taxation of Foreign Investment in the US and UK

• Overview of FDI Taxation Principles

The United Kingdom is largely guided in taxing foreign investors based on the idea that firms ought to be taxed on the income earned as a result of economic activity in the jurisdiction. The UK system of corporation tax is not just imposed on the domestic business, but all foreign companies that earn their revenues in the UK territory. The extent of taxation is however determined by the presence of a recognised permanent establishment (PE) of the foreign company in UK. The definition of PE is in line with the international standards, especially OECD Model Tax Convention which the UK has incorporated in its Corporation Tax Act. The PE is normally formed when a company is physically located in the UK, through the presence of a branch, office or factory and, or through an independent agent who has the power to enter into contracts on behalf of a business in the UK. The profits of a PE that have been established are liable to UK corporation tax in the same manner that the profits of domestic companies are liable.

 

The rate of corporation tax in the UK has been through a series of changes over the last few years that can be attributed to a wider international movement on balancing between being competitive and preserving revenue. As of April 2023, the rate is 25% on firms whose profits are more than 250,000 and a small profits rate of 19 on firms with profits of less than 50,000. At these limits, a marginal relief system will guarantee that the effective taxation rises progressively with profits. The latter dual-rate mechanism has been of particular importance to foreign investors since it affects the structuring and financing choices of investments. Large multinational companies with a UK PE could be subject to higher rate, but smaller or more focused companies could be subject to the lower rate.

In the case of foreign investors, it is crucial whether a PE exist or not. In the absence of a PE, the only income subjected to tax is that sourced in the UK, e.g. rental income on property or some royalties. In a PE, though, the horizons of taxation extend to cover trading gains directly associated with the activities of the UK. This difference is a reminder of the need to carefully design it: multi-national businesses tend to avoid exposure minimisation through representative offices or other limited operations not meeting PE status. However, the HMRC tax authority in the UK utilises substance-over-form, so that artificial arrangements with the aim of not being subject to PE classification are reviewed.

On top of headline rates, the UK has a number of tax reliefs and incentives that determine how effective the burden on imported investors is. An illustration of such is the Research and Development (R&D) Expenditure Credit regime which grants relief to investments in innovation by companies, and the Patent Box regime which imposes a lower effective rate of 10 on qualifying intellectual property income. These policies are aimed at attracting high value sector investment to match the UK government industrial policy objectives. Meanwhile, anti-avoidance legislation (including transfer pricing legislation and the diverted profits tax) means that multinational companies cannot strip out the UK tax base through aggressive profit-shifting approaches.

Relative to the UK, the taxation regime towards foreign investor is aimed at achieving a compromise between openness and protection. Its comparatively moderate corporate taxes coupled with a transparent legal system and international standards get it a good destination to invest in. Nevertheless, the growing complexity of regulations of PEs, and the tightening of the position on avoidance imply that investors need to operate within the system cautiously. UK is not merely playing the tax rate game but rather using incentives of targeted incentives to draw high-value investment, and guarded against base erosion and profit shifting. This presents a two-fold challenge to multinational investors: how to maximise the available reliefs whilst remaining within a more complex and more advanced anti-avoidance regime

 

3.3.1 Withholding Taxes and Treaties

The UK imposes a withholding tax of 20% on interest and royalties, though dividend payments to foreign shareholders are generally exempt. This framework reflects the UK’s long-standing objective of maintaining an attractive investment environment while ensuring a fair allocation of taxing rights. Importantly, the operation of withholding tax is mitigated by the UK’s extensive network of double taxation treaties (DTTs), which reduce or eliminate withholding obligations depending on the jurisdiction of the recipient. With more than 130 treaties in force, the UK’s treaty network is among the largest globally, reinforcing its reputation as a hub for international investment and finance. These treaties are designed not only to prevent double taxation but also to enhance transparency, foster cooperation between tax authorities, and encourage cross-border flows of capital and technology.

In practice, foreign investors benefit significantly from the UK’s approach. For example, where treaty provisions apply, the statutory 20% withholding tax on interest or royalties can be reduced substantially, often to 10%, 5%, or even 0%. This ensures that the UK remains competitive in attracting multinational enterprises seeking efficient structures for intellectual property licensing, intra-group financing, and cross-border transactions. Furthermore, exemptions for dividends make the UK particularly appealing as a holding company jurisdiction, especially when combined with its participation exemption for capital gains on disposals of substantial shareholdings.

• Controlled Foreign Companies (CFC) Rules

The UK’s Controlled Foreign Companies (CFC) regime, codified under the Taxation (International and Other Provisions) Act 2010 (TIOPA), serves as a critical safeguard against tax base erosion. It enables HM Revenue & Customs (HMRC) to attribute profits of non-UK resident subsidiaries to their UK parent where those profits are considered to have been artificially diverted from the UK. The regime targets arrangements that exploit differences in international tax systems to shift profits into low-tax jurisdictions, thereby undermining the UK tax base.

The CFC rules strike a balance between anti-avoidance measures and maintaining competitiveness. Exemptions exist for genuine commercial activities carried out overseas, ensuring that the rules do not discourage legitimate business operations. For example, subsidiaries engaged in substantive economic activities—such as manufacturing or service provision—are generally outside the scope of the regime. Instead, the rules focus on profits arising from passive income, intellectual property, and financing structures where there is limited economic substance.

Since the corporate tax reforms of 2012, the CFC regime has been recalibrated to reflect the UK’s broader policy shift towards a more territorial tax system. This reform sought to encourage multinational groups to locate their headquarters in the UK by providing certainty, flexibility, and competitive tax treatment, while at the same time preserving safeguards against abusive profit-shifting. The introduction of a “gateway test” ensures that only profits that have a real risk of artificial diversion are subject to HMRC challenge.

Overall, the combination of treaty-based reliefs, favorable withholding tax exemptions, and robust but targeted CFC rules demonstrates the UK’s attempt to balance its dual objectives: encouraging inward investment while protecting the integrity of its corporate tax base. These measures align with the OECD’s Base Erosion and Profit Shifting (BEPS) recommendations and illustrate the UK’s commitment to fostering a transparent and resilient tax environment that accommodates global business activity without sacrificing fiscal sovereignty.

3.3.2 United States Taxation of Foreign Investors

1. Income Sourcing and Entity Classification

The United States taxes foreign corporations on income that is “effectively connected” with a US trade or business under IRC §882. This includes income from permanent establishments or fixed bases in the US. Foreign investors may structure their operations through Limited Liability Companies (LLCs) or C-Corporations, which have different tax treatments. LLCs, often treated as pass-through entities, are popular among private investors but pose complications under treaty eligibility.

3.3.3 Corporate Tax Rates and Repatriation

a. The Tax Cuts and Jobs Act and Its Impact on FDI

The Tax Cuts and Jobs Act (TCJA) of 2017 represented one of the most significant overhauls of the US tax code in decades, with profound implications for foreign direct investment (FDI). By reducing the federal corporate tax rate from 35%—one of the highest among OECD countries—to a flat 21%, the US positioned itself as a far more attractive location for multinational investment. This dramatic shift in headline taxation enhanced the competitiveness of the American economy in relation to its peers, particularly those within the European Union, where average corporate rates had already been declining. For foreign investors, the lower rate meant that profits derived from US operations were subject to a lighter fiscal burden, thereby increasing after-tax returns. The reform also reduced the incentive for profit-shifting abroad, as the gap between US taxation and foreign effective tax rates narrowed considerably. In addition, the flat rate structure eliminated the graduated system, providing simplicity and predictability for cross-border investors evaluating long-term projects in the US market.

Beyond the rate reduction, the TCJA introduced the Global Intangible Low-Taxed Income (GILTI) regime, targeting income earned by controlled foreign corporations (CFCs) from intangible assets such as intellectual property. GILTI requires US shareholders of CFCs to include in their taxable income a portion of low-taxed foreign earnings, thereby limiting the ability of multinational enterprises to shift profits into low-tax jurisdictions. This provision has been particularly consequential for technology, pharmaceutical, and digital services firms, where intangible assets play a central role in value creation. By discouraging the artificial allocation of intangible profits overseas, GILTI not only sought to protect the US tax base but also signaled a broader shift towards international tax coordination. Foreign investors have had to carefully evaluate how the GILTI regime interacts with existing transfer pricing rules and bilateral treaties, as the regime represents a departure from traditional territorial taxation principles.

Another major innovation of the TCJA was the introduction of a participation exemption system for dividends received by US parent companies from foreign subsidiaries. Under this measure, qualifying dividends are exempt from US taxation, effectively moving the US closer to a territorial tax system. For decades, the worldwide taxation approach—where US multinationals were taxed on global earnings with foreign tax credits—was criticized as uncompetitive and distortionary. The participation exemption has largely removed the repatriation tax barrier, encouraging US companies to bring back foreign earnings without triggering additional federal liability. From a foreign investor perspective, this reform created a more level playing field, as US multinationals could now allocate capital more freely without suffering a tax disadvantage relative to foreign rivals headquartered in territorial regimes. However, this policy also raised concerns about potential base erosion, hence its coupling with the GILTI and BEAT (Base Erosion and Anti-Abuse Tax) provisions to preserve revenue integrity.

Despite these reforms aimed at fostering competitiveness, foreign investors remain subject to a 30% withholding tax on US-source fixed, determinable, annual, or periodical (FDAP) income. This includes payments of interest, dividends, royalties, and certain other types of passive income. While double taxation treaties (DTTs) often reduce this rate substantially, the statutory 30% levy remains a significant consideration for inbound investment structuring. The withholding framework reflects the US policy of taxing income at source, ensuring that profits generated within its jurisdiction contribute to the domestic revenue base. For foreign investors, the extent of treaty relief available can make a decisive difference in effective tax burdens. For instance, investors from treaty jurisdictions such as the UK, Germany, or Japan often benefit from reduced rates ranging between 0% and 15% depending on the income type. By contrast, investors from countries without comprehensive treaties with the US face the full 30% rate, rendering certain cross-border financing or licensing arrangements less attractive. The interplay between withholding obligations and treaty networks illustrates how international tax diplomacy directly influences FDI decisions.

In practice, the combination of a lowered corporate tax rate, territorial features, and enhanced anti-avoidance rules has created a more nuanced tax environment for inbound and outbound investors. While the TCJA has succeeded in improving headline competitiveness, its complex provisions particularly GILTI and BEAT have introduced new compliance burdens and uncertainties. For foreign investors, the reforms offer both opportunities in terms of lower effective rates and challenges in navigating a system increasingly vigilant against erosion of the US tax base. Ultimately, the TCJA reflects a balancing act: positioning the US as an attractive destination for capital while simultaneously safeguarding fiscal sovereignty in a globalized and mobile economy.

3.4 Foreign Investment in Real Property Tax Act (FIRPTA)

Enacted in 1980, FIRPTA requires foreign investors disposing of real property interests in the US to pay tax on the gain. The rationale is that real estate is inherently tied to US jurisdiction. FIRPTA has been frequently amended to include publicly traded REITs and other complex structures, indicating the US’s vigilance in taxing asset-based FDI.

3.4.1 BEAT and Base Erosion Concerns

Base Erosion and Anti-Abuse Tax (BEAT): History and Purposes.

The Base Erosion and Anti-Abuse Tax (BEAT) was a new tax that was implemented in response to the apprehension that multinational enterprises (MNEs) were durably weakening the US tax base by means of aggressive profit-shifting activities. BEAT is treated as a minimum tax imposed on corporations whose gross receipts are averagely more than 500 million a year and have large deductible payments to foreign affiliates. It also focuses mainly on large multinational organizations who are able to reduce their US taxable income by making payments- royalties, interests, and management fees- outside the United States and into low-tax jurisdictions. In contrast to the enforcement of transfer pricing under IRC SS482 that involves a detailed examination of whether intercompany payment is reflective of an arm length price, BEAT is more of a formulaic based approach. It levies a minimum tax amounting to 10 percent of modified taxable income, without deduction of base erosion payments, so that highly aggressive tax planning will fail to fully shelter profits against US taxation.

The introduction of BEAT brought a major change in the US war strategy against erosion of bases. Where prior measures were based upon each case being adjusted case-by-case, and the judicial doctrine that the substance of the transaction should be applied instead of its form, BEAT is an automatic process that would punish overreliance on related-party payments. Its expanse portrays increasing anger regarding the shortcomings of the conventional transfer pricing enforcement, particularly where intangible assets are quite common in the industries. As an illustration, intercompany licensing is a common arrangement used by digital companies to bring the profits back to the US and then transfer them to subsidiaries in jurisdictions where there is a low or zero tax. BEAT decreases the incentive to use such strategies directly, by disallowing deductions on such payments in the event they are over a specified limit. Critics on the other hand point to the fact that BEAT has the risk of taxing bona fide commercial transactions and in cases where payment has already been taxed in the recipient jurisdiction, a second taxation would occur.

3.5 Foreign Investor implications and Comparative implications.

BEAT has brought in yet another level of complexity and compliance costs to foreign investors. International firms whose headquarters are located outside the US but with American affiliate companies have to reconsider their cross-border payments and whether they can fall under the definition of base erosion and, accordingly, modify their tax planning. This poses specific problems to international banking, insurance, and pharmaceutical companies, which usually depend on bank-to-bank financing and the licensing of intellectual property rights. Moreover, since BEAT usually does not grant foreign tax credits on taxes paid in a foreign country, corporations are at the risk of effective foreign taxation, which degrades the appeal of the US investment in capital-intensive or IP-heavy industry. Other companies have reacted by reorganising supply chains, re-defining intra-group service contracts or capitalising subsidiaries so as to minimise dependency on deductible payments.

 

BEAT is a unilateral US action, which in the global scenario is found to be incompatible with multi-lateral initiatives like the OECD Base Erosion and Profit Shifting (BEPS) project. Whereas OECD has focused on harmonised rules and arm-length pricing, BEAT has imposed a minimum tax regardless of what has been agreed on internationally. This has caused other trading partners to criticize BEAT as being contrary to the principles of past treaties, especially the ban on discriminatory taxation of cross-border transactions. However, policy-wise BEAT reemphasizes the US intent to shield its domestic tax base against aggressive planning and to deter the use of intangible-intensive schemes that drain profits overseas.

 

Moving forward, the Biden administration and Congress have discussed BEAT reform, including substituting it with the Stopping Harmful Inversions and Ending Low-Tax Developments (SHIELD) proposal, which would be closer to the global minimum tax proposals in the OECD under Pillar Two. Regardless of whether BEAT will be substituted, the action puts into the limelight the conflict between the need to provide a favourable investment environment and protection against tax base erosion. The US market is still profitable to foreign investors, but the introduction of BEAT will mean that profitability will be balanced with increased compliance costs and a more difficult anti-avoidance environment. Finally, BEAT can be viewed as the general trend of developed economies switching to minimum tax regimes in order to meet the challenges of globalisation, digitalisation as well as more mobile capital.

3.4.1 Comparative Tax Treaty Networks and Strategic Treaty Use

Both the United Kingdom and the United States boast comprehensive tax treaty networks designed to eliminate double taxation, foster cross-border investments, and establish cooperative mechanisms for information sharing and dispute resolution. However, their respective treaty policies reflect divergent economic priorities and legal frameworks.

1. UK Treaty Network

The UK maintains over 130 double taxation agreements (DTAs), one of the largest treaty networks in the world. These treaties are based on the OECD Model Tax Convention, and they often provide generous reliefs on withholding taxes, define clear PE standards, and include provisions for arbitration under the Mutual Agreement Procedure (MAP).

For example, under the UK-UAE Double Taxation Treaty, dividends, interest, and royalties may be taxed in the source country but are often subject to reduced or zero withholding tax in line with Article 10–12 of the OECD model. This has significantly enhanced London’s position as a hub for holding and financing investments from Middle East investors.

2. US Treaty Network

The United States has tax treaties with over 60 countries, but unlike the UK, it does not follow the OECD model rigidly. Instead, it uses its own US Model Income Tax Convention, which includes distinct clauses such as Limitation on Benefits (LOB). These LOB provisions are designed to prevent treaty shopping and ensure that only residents with genuine connections to a country are eligible for treaty relief.

The US-UK Tax Treaty (2001, amended 2003) is one of the most comprehensive, with Article 7 defining taxation rights over business profits and Article 24 dealing with non-discrimination. The treaty enables UK companies operating in the US to receive relief from double taxation, subject to US sourcing and effective connection rules.

3. Treaty Shopping and Anti-Avoidance

Multinational corporations have historically engaged in treaty shopping—channeling investments through intermediary jurisdictions to avail lower tax rates. Both HMRC and the IRS now aggressively counter such strategies through LOB clauses, GAAR (General Anti-Abuse Rule) in the UK, and Section 7701(l) in the US, which allows for the recharacterization of transactions for tax purposes.

 

3.6 Case Studies of Corporate FDI Strategies

1. British Companies Investing in the US

BP plc, a British multinational oil and gas company, has extensive operations in the United States. Through its American subsidiary, BP America, the company invests in oil exploration, renewable energy, and refining. By establishing a taxable US presence, BP is subject to federal and state taxes but benefits from stability and treaty relief.

The company’s restructuring post-Deepwater Horizon incident involved shifting assets and liabilities within US subsidiaries to optimise loss deductions, capital allowance claims, and BEAT exemptions. BP also uses intercompany financing structures which are carefully reviewed under US transfer pricing rules (IRC §482).

Another example is Barclays Bank, which has operated in New York and Delaware through branches and subsidiaries. In 2015, Barclays reorganised its US holding structure to comply with the Dodd-Frank Act, creating a standalone Intermediate Holding Company (IHC). The IHC was tax-efficient due to deductibility of internal borrowings and compliance with both Federal Reserve and IRS requirements.

2. American Companies Investing in the UK

Amazon UK Services Ltd, though a subsidiary of Amazon.com Inc., has been under intense scrutiny for transferring UK profits to Luxembourg and other jurisdictions via royalty payments and transfer pricing mechanisms. In response to BEPS (Base Erosion and Profit Shifting), the UK introduced the Diverted Profits Tax (DPT), often dubbed the “Google Tax,” to tax profits perceived to be artificially shifted.

Apple Inc., similarly, operates in the UK through various entities that manage retail operations, logistics, and R&D. Post-Apple v Commission (Case T-778/16) ruling at the EU General Court, the group began restructuring IP ownership and tax residency to comply with UK’s CFC rules and avoid DPT exposure.

3. International Cooperation and Tax Governance

The Base Erosion and Profit Shifting (BEPS) project, led by the OECD and G20, has fundamentally reshaped international tax law. The UK and US, both members of the Inclusive Framework, have adopted multiple BEPS action points, particularly:

• Action 5: Harmful tax practices (patent box regimes reviewed)
• Action 6: Treaty abuse
• Action 13: Country-by-Country Reporting
• Action 14: Dispute resolution mechanisms

The OECD/G20 Two-Pillar solution aims to:

• Pillar One: Reallocate taxing rights to market jurisdictions regardless of physical presence.
• Pillar Two: Introduce a 15% global minimum corporate tax, which the UK has committed to implement from 2024.

The US supports the global minimum tax in concept, but due to its GILTI and BEAT regimes, alignment with Pillar Two remains complex and politically contentious.

Although the UK has left the European Union, its previous alignment with EU Anti-Tax Avoidance Directives (ATAD), including interest limitation rules, hybrid mismatch rules, and exit taxation, continues to shape domestic legislation. Post-Brexit, the UK aims to maintain an attractive tax regime to retain inbound FDI, though without binding obligations to harmonise with EU tax law.

The Inflation Reduction Act 2022 and proposed tax reforms under the Biden administration seek to increase corporate tax rates, reform the GILTI regime, and adopt a minimum book tax on large corporations. While aiming to protect revenue, these changes may make the US less attractive for certain FDI, particularly in capital-intensive industries.

4. Emerging Risks and Planning Opportunities

1. Transfer Pricing Scrutiny

Transfer pricing remains one of the most scrutinised areas of cross-border investment taxation. Both HMRC and the IRS have intensified their review of intercompany transactions, with a focus on intangible assets, financing arrangements, and services. The UK’s updated transfer pricing guidelines (2023) require a local file, master file, and a UK-specific summary audit trail form. The US, on the other hand, enforces IRC Section 482, and penalises non-arm’s length pricing with steep adjustments.

A prominent example includes GlaxoSmithKline’s US transfer pricing settlement (2006)—a landmark case where the company paid $3.4 billion to the IRS over IP and marketing intangibles transferred to US affiliates. This case highlights the lasting implications of poor documentation and aggressive tax structuring.

1. Pillar Two Compliance and Global Minimum Tax

The introduction of the OECD’s Pillar Two global minimum tax (15%) introduces both compliance burdens and strategic shifts. UK multinationals are now preparing GloBE calculations to assess whether their overseas subsidiaries fall below the minimum tax rate. US-headquartered groups, with their GILTI regime, may not fully align with GloBE but must still navigate foreign tax credit limitations, BEAT, and proposed SHIELD rules under Congressional reforms.

HSBC has indicated in its 2023 annual report that Pillar Two could increase its effective tax rate in low-tax jurisdictions such as Hong Kong and UAE, thereby affecting group-level investment return metrics.

5. Rise of Domestic Anti-Avoidance Legislation

Both the UK and US have expanded domestic anti-avoidance provisions:

• The UK’s GAAR(General Anti-Abuse Rule) now covers not only artificial arrangements but also abusive ones, with penalties up to 60% of the tax advantage gained.
• The US Economic Substance Doctrine, codified in IRC §7701(o), requires that transactions have a substantial purpose and economic effect beyond tax savings.

The Apple “Double Irish with a Dutch Sandwich” structure, once common among US tech giants operating in Europe, is now defunct due to these laws, and new structures must prioritise transparency and defensibility.

6. Brexit-Induced Uncertainty

The UK’s departure from the EU has introduced considerable ambiguity for investors seeking EU-wide access. Previously, UK companies benefited from the Parent-Subsidiary Directive and Interest & Royalties Directive, allowing for tax-free intergroup payments within the EU. These are no longer applicable, forcing companies to re-evaluate their holding structures.

For instance, Unilever’s dual-headed structure (UK and Netherlands) was under review for potential simplification post-Brexit. The company ultimately opted for a single UK listing but continues to assess treaty access routes for operations across Europe.

8. Conclusion

The taxation of foreign investment in the United States and the United Kingdom presents a dynamic interplay between domestic tax law, treaty frameworks, and global economic policy. Both jurisdictions maintain attractive but complex regimes for inbound investment, balancing the need for competitiveness with regulatory oversight and anti-abuse enforcement.

The UK has emerged as a post-Brexit financial hub aiming to combine low corporate tax rates with extensive treaty coverage and investor-friendly incentives such as the Substantial Shareholdings Exemption (SSE) and Patent Box. At the same time, it remains committed to OECD tax reforms, environmental taxation, and digital economy regulations. Its departure from the EU, however, adds pressure to maintain bilateral treaties to preserve FDI flow.

Conversely, the US—with its powerful consumer market, advanced capital markets, and robust legal infrastructure—continues to attract foreign capital despite its higher nominal tax burdens. Its Internal Revenue Code, while notoriously complex, offers strategic advantages through like-kind exchanges, accelerated depreciation, and flexible financing options. Yet, compliance with BEAT, FATCA, and shifting state-level regimes can be burdensome, particularly for smaller multinationals.

Both countries are adapting to global demands for tax fairness and transparency, exemplified by their support for the OECD BEPS framework, Pillar One and Two initiatives, and increased multilateral cooperation through forums such as the Joint International Taskforce on Shared Intelligence and Collaboration (JITSIC).

Looking forward, multinational enterprises must move beyond aggressive tax planning toward integrated tax governance. Investment structures must be designed with foresight into evolving compliance expectations, tax justice considerations, and ESG alignment. As international tax continues to globalise, the UK and US will remain pivotal not only in shaping rules but in embodying the ideological contest between territoriality and global taxation.