The structure of a country’s tax code remains a critical determining factor of its overall economic performance. A well-structured tax code facilitates compliance for taxpayers, promotes robust economic development, and raises sufficient revenue to meet a government’s core priorities. Conversely, poorly designed tax systems can introduce excessive compliance costs, distort vital economic decision-making, and inflict lasting harm on domestic economies.
Recognizing these principles, numerous nations have pursued meaningful tax reforms over recent decades. Across the Organisation for Economic Co-operation and Development (OECD), marginal tax rates on corporate and individual income have declined significantly. Today, most OECD nations rely heavily on broad-based revenue mechanisms, such as payroll taxes and value-added taxes (VAT), to fund public expenditures.
However, recent policy trajectories among OECD countries have not universally improved tax structures. While nations like Austria have reduced corporate income tax rates by several percentage points, others—such as France, the Slovak Republic, and Slovenia—have moved in the opposite direction by raising them. At the same time, improvements to corporate tax bases have been implemented in Canada, Germany, Lithuania, the United Kingdom, and the United States, whereas the Czech Republic and Slovenia have made their corporate bases less competitive. Notably, countries like Germany and Finland are phasing out temporary enhancements to their corporate tax bases that Lithuania, the United Kingdom, and the United States have chosen to make permanent and expand.
In recent years, tax policy has increasingly drifted away from its traditional roles of raising government revenue and encouraging productive investment. Instead, it has been integrated into the broader toolbox of international tax and trade disputes, with import tariffs, digital service levies, and extraterritorial taxes deployed to exert economic pressure. In this complex environment, policymakers are urged to refocus on neutral, internationally competitive tax policies that secure revenue while minimizing distortions to investment and growth.
To evaluate these diverse systems relative to one another, the International Tax Competitiveness Index (ITCI) offers a relative comparison of OECD countries based on two pillars: competitiveness and neutrality. A competitive tax code keeps marginal effective tax rates low in a globalized world where capital is highly mobile, preventing businesses from redirecting investments elsewhere in search of higher after-tax returns. Meanwhile, a neutral tax code seeks to raise revenue with the fewest economic distortions, avoiding biases against saving and minimizing targeted tax breaks for specific commercial activities. By assessing more than 40 tax policy variables—covering corporate, individual, consumption, and property taxes, alongside the treatment of overseas profits—the ITCI provides a comprehensive overview of how developed nations compare.
Estonia Continues Its Reign at the Top
For the 13th year in a row, Estonia claims the top spot for having the best tax code in the OECD. This leading position is anchored by four key features of its tax framework: a 22 percent corporate income tax rate applied exclusively to distributed profits; a flat 22 percent individual income tax that exempts personal dividend income; a property tax levied solely on the value of land rather than real property or capital; and a territorial tax system that fully exempts 100 percent of foreign profits earned by domestic corporations with minimal restrictions.
Other top-ranking nations achieve high scores through excellence across specific tax categories. Latvia, which recently adopted the Estonian corporate tax model, also maintains an efficient system for labor taxation. New Zealand combines a flat, low-rate individual income tax with capital gains exemptions, a broad-based VAT, and an absence of inheritance, property transfer, asset, or financial transaction taxes. Switzerland features a competitive 19.5 percent corporate tax rate, a broad-based consumption tax, and partial capital gains exemptions. Lithuania offers a 17 percent corporate tax rate paired with full expensing for machinery, equipment, and intangible rights. Luxembourg levies a broad-based VAT on a significant portion of final consumption, exempts long-term capital gains, and maintains a cross-border regime free of withholding taxes on interest or royalties.
At the other end of the spectrum, France ranks as having the least competitive tax system in the OECD, burdened by a top corporate tax rate of 36.1 percent, multiple surtaxes, distortive production taxes, and various property and wealth levies. Colombia follows as the second-least competitive system, featuring a net wealth tax, a financial transaction tax, a 35 percent corporate income tax rate that generally does not exempt foreign-earned income, and a narrow VAT base.
Notable Policy Shifts Across the OECD
Several member nations introduced significant legislative changes ahead of the 2026 index. Canada abolished its digital services tax, canceled a planned capital gains inclusion rate increase, and reinstated full expensing for machinery alongside accelerated investment incentives for buildings. Denmark added a personal income tax bracket in 2026, lifting its top rate from 55.9 to 60.5 percent while raising the top threshold. Finland phased out accelerated depreciation for machinery and equipment while reducing its top personal income tax rate from 57 to 50.4 percent.
Lithuania increased its corporate tax rate from 16 to 17 percent while substantially enhancing competitiveness through permanent full expensing for machinery, equipment, and intangible rights, alongside a broadened VAT base. Portugal continued incremental reductions to its top corporate tax rate, lowering it from 31.5 percent in 2024 to 29.5 percent in 2026, while also cutting taxes on long-term capital gains. The Slovak Republic increased its corporate rate to 24 percent, introduced a financial transaction tax, and raised its top personal income tax rate to 44.4 percent, leading to a drop in its overall rank. The United States reinstated permanent full expensing for plants and equipment while tightening cross-border rules by abolishing certain substance exclusions for foreign-earned income.
Evaluating Corporate, Individual, Consumption, and Property Taxes
Corporate income taxes continue to play a major role in shaping investment incentives, despite accounting for an average of just 11.9 percent of total government revenues across the OECD in 2023. Top statutory rates vary widely, ranging from Hungary’s low 9 percent and Ireland’s 12.5 percent to France’s 36.1 percent and Colombia’s 35 percent, against an OECD average of 24.2 percent. Cost recovery provisions, loss carryover rules, and inventory accounting methods further dictate the true tax burden on capital investment, with a growing number of countries adopting permanent full expensing to encourage capital formation.
Individual tax structures, comprising ordinary income taxes, payroll contributions, and capital gains or dividend levies, balance revenue generation with labor market incentives. Top statutory personal income tax rates—including employee social contributions—reach as high as 61.3 percent in Slovenia and 60.5 percent in Denmark, while nations like Estonia maintain flat structures at 22 percent. Double taxation of corporate profits through capital gains and dividend taxes continues to influence savings and investment decisions, though various integration mechanisms are utilized across member countries.
Consumption taxes, primarily structured as value-added taxes, remain among the most economically efficient revenue sources when applied broadly. While the OECD average consumption tax rate sits at 19.4 percent—with Hungary reaching a high of 27 percent—tax bases often face erosion due to reduced rates, exemptions, and high registration thresholds that favor smaller businesses.
Property taxes, ranging from recurrent taxes on immovable property to wealth, estate, and financial transaction taxes, demonstrate varying degrees of economic neutrality. Real property taxes that apply exclusively to land values, such as those in Estonia and Australia, are viewed as more economically efficient than those targeting physical structures and capital improvements. Meanwhile, cross-border tax rules are undergoing a profound transformation as nations navigate the ongoing implementation of global minimum tax frameworks, evolving participation exemptions, and changing anti-avoidance regulations.
