For decades, multinational corporations have shifted profits across borders, reducing the tax revenue collected by the countries in which they operate. As governments move to close these loopholes, a new global tax system is taking shape. These changes are reshaping corporate strategies, transforming tax havens, and redefining how nations compete for investment.
A race to the bottom
The structure of the international tax system helps explain how this shift in profit occurred. The world’s largest multinational enterprises, such as Apple, Google, and Amazon, have taken advantage of a system that treats each branch of a multinational company as if it were an independent business, even though all subsidiaries ultimately belong to the same global company. As a result, these companies report less profits in higher-tax countries and allocate a significant share of their global earnings to jurisdictions with lower tax rates, such as Bermuda, Singapore, and Ireland. This tax strategy allows them to legally reduce their overall tax liability, and in some cases, almost eliminate it entirely.
This created what we now call the “tax haven” economy: a system where countries compete to attract global businesses by offering the lowest tax rates possible. Although this was not illegal, it meant that governments in high-tax countries were ultimately collecting less revenue despite rising corporate profits.
To stop this “race to the bottom,” over 140 nations — including Canada — congregated in 2021 to reform the international tax system under the leadership of the OECD, an organisation that coordinates global economic activity. The result was the Global Minimum Tax (often referred to as Pillar Two) which requires companies with consolidated annual revenues of €750 million or more to pay a tax rate of at least 15 per cent, regardless of where they operate. If a company shifts profits to a country with a lower tax rate, its home country can now collect the difference. In short, the 15 per cent rule closes the loopholes that once allowed profits to go untaxed.
From policy to practice
Implementation began in 2024 and has continued throughout 2025. For lawyers, accountants, and corporate executives, this has brought practical changes to how global taxes are planned, reported, and managed.
Countries that once relied on their low-tax appeal are now having to rethink how they attract global investment. Larger economies are regaining leverage — though not all have moved at the same pace. Several jurisdictions, including members of the European Union, Korea, and
Switzerland, have already introduced legislation to apply the 15 per cent minimum. Others, like Japan, Singapore, and India, are taking steps toward adoption, recognising the growing global pressure to align.
The United States, however, has taken a different route. Rather than implementing the OECD’s Pillar Two framework directly, it introduced its own Corporate Alternative Minimum Tax. Under the U.S. Minimum Tax, the government compares a company’s reported profits to the amount of U.S. tax it actually paid and ensures that it equals at least 15 per cent, collecting the difference in the United States if it falls short. This approach retains tax authority within the United States, prioritising its domestic competitiveness while creating uncertainty over how overlapping minimum tax regimes will be resolved.
Closing quiet loopholes
Furthermore, Canada has also entered the transition. Legislation introduced in 2024 aligns the country with the OECD framework. While the policy’s goal is to make sure profits tied to Canada are taxed fairly, it also raises new questions about competitiveness and coordination. For Canada, the challenge is not just about passing the legislation, it’s about making it work alongside other countries that are moving at different speeds. If the U.S. continues to hold back, Canadian enterprises could face higher effective tax rates than their American counterparts, which may discourage investment, pushing companies to shift operations south of the border. Nevertheless, the reform could help Canada recover lost tax revenue and demonstrate leadership in global cooperation.
The Global Minimum Tax has made it more difficult for firms to shift profits to low-tax locations, but it has not brought tax competition to an end. Many countries are now reinventing their tax systems by offering targeted tax credits, research and innovation incentives, and flexible corporate rules that still attract global firms while staying compliant with the 15 per cent minimum. Ireland offers a clear example of this shift. In response to Pillar Two, the country has restructured its refundable R&D tax credit and has increasingly emphasised its direct access to the EU market and international supply chain, highly skilled workforce, and stable business environment as central to its appeal for global companies, rather than its previous 12.5 per cent corporate tax rate.
Pillar Two represents more than a policy adjustment. It has real life consequences for households and society at large. By limiting the ability of multinational enterprises to shift profits to low-tax jurisdictions, the reform is expected to generate more stable and predictable government tax revenues. For citizens, this stability matters because it supports the continued provision of essential public services, including healthcare, education, infrastructure, and social support programs that directly affect quality of life. More consistent corporate tax revenues may also reduce the need for governments to place additional burdens on households through higher personal income or consumption taxes. At the same time, jurisdictions that previously relied on low corporate taxation may face short-term fiscal pressures as they adjust to the new framework, which could require difficult policy trade-offs. Yet the shift away from tax-driven competition encourages countries to prioritise jobs, productivity, and building stronger public institutions. Although the full effects of Pillar Two will take years to unfold, its success will be measured by how it affects everyday living standards and broader economic stability, rather than by corporate tax outcomes alone.
