The structure of a country’s tax code remains a decisive factor in its overall economic performance, balancing the need to raise sufficient public revenue with the imperative to promote sustainable growth. According to the 2026 International Tax Competitiveness Index released by the Tax Foundation, a well-structured tax code should be straightforward for taxpayers to comply with, minimizing market distortions and avoiding unnecessary economic costs. Conversely, poorly designed tax systems can distort economic decision-making, burden domestic markets, and ultimately harm long-term economic development.
Over the past few decades, many nations within the Organisation for Economic Co-operation and Development (OECD) have recognized these risks and implemented major structural reforms. Across the developed world, marginal tax rates on both corporate and individual income have declined significantly. Today, the majority of OECD nations raise a substantial share of their tax revenue from broad-based mechanisms such as payroll taxes and value-added taxes (VAT).
However, recent policy shifts among developed economies have not universally enhanced tax system neutrality. While countries like Austria have lowered corporate income tax rates by several percentage points, others—including France, the Slovak Republic, and Slovenia—have moved in the opposite direction by raising them. At the same time, improvements to the corporate tax base have been advanced in nations such as Canada, Germany, Lithuania, the United Kingdom, and the United States, whereas countries like the Czech Republic and Slovenia have enacted changes that make their corporate tax bases less competitive. Notably, Germany and Finland are currently 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, international tax policy has increasingly drifted away from its traditional economic foundations of raising revenue and encouraging investment. Instead, tax policy has frequently been co-opted into a broader toolkit for international trade and geopolitical disputes, with import tariffs, digital service levies, and extraterritorial taxes deployed to exert economic pressure. Experts emphasize that in this volatile environment, policymakers should refocus on neutral, internationally competitive tax policies designed to fund government priorities with minimal harm to investment and economic growth.
Measuring Competitiveness and Neutrality
To evaluate how different developed economies compare in this complex landscape, the International Tax Competitiveness Index provides a relative comparison of OECD tax systems, focusing on two core principles: competitiveness and neutrality.
A competitive tax code keeps marginal effective tax rates low. In an increasingly globalized world where capital is highly mobile, businesses can freely invest across international borders to find the highest possible rate of return. If a country’s tax burden is excessively high, it risks driving investment elsewhere, resulting in slower domestic economic growth. Furthermore, high marginal tax rates can impede domestic investment and encourage aggressive tax avoidance. Research from the OECD indicates that corporate income taxes are historically the most harmful for economic growth, followed by personal income taxes and consumption taxes, while taxes on immovable property have the smallest negative impact.
Simultaneously, a neutral tax code aims to raise maximum revenue with minimal economic distortions. A neutral system does not artificially favor consumption over saving—a common pitfall of investment and wealth taxes—and avoids targeted tax breaks for specific commercial activities or individuals. As tax laws grow increasingly intricate, they frequently lose their neutrality. When complex rules allow large corporations or wealthy individuals to alter their behavior specifically to secure tax advantages, the foundational integrity of the tax system is undermined.
The index evaluates these dynamics by analyzing more than 40 distinct tax policy variables across a country’s tax code, covering corporate taxes, individual income taxes, consumption taxes, property taxes, and the treatment of overseas profits.
2026 Rankings and Country Highlights
For the thirteenth consecutive year, Estonia claims the title of having the best tax code in the OECD. Estonia’s leading performance is anchored by four key structural features: a 22 percent corporate income tax rate applied exclusively to distributed profits, a flat 22 percent personal income tax that exempts distributed dividends, a property tax levied solely on the value of land rather than real property or capital, and a territorial tax system that fully exempts foreign profits earned by domestic corporations without restrictive conditions.
Other top-ranking nations achieve high scores through excellence across specific tax categories. Latvia, which recently adopted the Estonian corporate tax model, maintains an efficient labor taxation system. New Zealand features a low-rate, flat individual income tax that largely exempts capital gains, a broad-based VAT, and no taxes on inheritance, property transfers, assets, or financial transactions. Switzerland combines a competitive 19.5 percent corporate tax rate with a broad-based consumption tax and partial capital gains exemptions. Lithuania maintains a 17 percent corporate tax rate, permits full expensing for machinery and equipment, and levies a low, flat individual income tax. Luxembourg leverages a broad-based VAT covering 87 percent of final consumption alongside an accommodating cross-border regime free of withholding taxes on interest or royalties.
At the opposite end of the spectrum, France ranks as having the least competitive tax system in the OECD. France maintains the highest top corporate tax rate in the developed world at 36.1 percent—bolstered by multiple surtaxes and distortive production taxes—alongside complex property taxes, estate levies, bank asset taxes, financial transaction taxes, and a real estate wealth tax. Colombia follows closely as the second-least competitive tax system, constrained by a net wealth tax, a financial transaction tax, a 35 percent corporate rate that does not generally exempt foreign-earned subsidiary income, and a narrow VAT base.
Overall, countries ranking poorly on the index typically impose high marginal tax rates on corporate income or maintain layered, complex tax rules. Four of the five lowest-ranking nations feature higher-than-average combined corporate tax rates, unusually narrow VAT bases covering between 35 and 50 percent of final consumption, and a heavy reliance on distortive levies such as digital services taxes, financial transaction taxes, wealth taxes, and capital duties.
Notable Policy Changes Across Member States
Several significant national tax reforms have reshaped the international tax landscape over the past year.
In Canada, authorities abolished the digital services tax, canceled a planned increase in the capital gains inclusion rate, and reinstated full expensing for machinery alongside accelerated investment incentives for buildings. Canada maintains its 15th-place ranking.
Denmark introduced a new personal income tax bracket, raising its top statutory rate from 55.9 percent to 60.5 percent while adjusting the top rate threshold. Consequently, Denmark’s ranking slipped from 29th to 31st place.
Finland phased out accelerated depreciation for machinery and equipment, reducing the share of investment costs businesses can recover. However, Finland simultaneously lowered its top personal income tax rate from 57 percent to 50.4 percent, allowing the country to hold steady at 22nd place.
Lithuania raised its corporate tax rate slightly from 16 to 17 percent while significantly enhancing the competitiveness of its tax base by introducing permanent full expensing for machinery, equipment, and intangible rights, alongside a broadened VAT base. Lithuania retains its 5th-place ranking.
Portugal continued incremental reductions to its top corporate tax rate, lowering it from 31.5 percent in 2024 to 29.5 percent by 2026, while also reducing its tax rate on long-term capital gains. Portugal remains ranked 33rd.
The Slovak Republic increased its corporate tax rate from 21 to 24 percent in 2025, introduced a financial transaction tax, and raised its top personal income tax rate to 44.4 percent in 2026. These shifts caused the Slovak Republic’s ranking to decline from 9th to 12th place.
The United States reinstated full expensing for plants and equipment while expanding the policy to selected industrial buildings. Starting in 2026, the U.S. also tightened its cross-border rules by replacing previous intangible income provisions with broader foreign-source income minimum taxes. The U.S. ranking adjusted from 16th to 17th place.
Methodological Updates and Structural Categories
To maintain analytical accuracy, index evaluators regularly review and refine the methodology used to measure competitiveness and neutrality. For the 2026 edition, adjustments were introduced regarding how corporate taxes, individual taxes, and cross-border rules are evaluated. These changes have been applied retroactively to prior years within the project’s public repository to ensure consistency over time, though results from the 2026 report cannot be directly compared with editions published prior to this methodological update.
The corporate income tax category evaluates combined top marginal rates, cost recovery provisions—including loss carryforwards, loss carrybacks, capital allowances for machinery and buildings, inventory accounting methods, and allowances for corporate equity—and structural complexity, including the presence of patent boxes, R&D tax subsidies, digital services taxes, and turnover levies.
Individual income tax evaluations focus on ordinary wage taxation, top statutory rates, income thresholds, labor tax efficiency, and the double taxation of corporate profits through capital gains and dividend taxes. Consumption taxes are assessed based on standard tax rates, registration thresholds, and the breadth of the VAT or sales tax base relative to total national consumption. Property taxes examine recurrent real property levies, wealth taxes, estate and inheritance duties, and business asset or financial transaction taxes.
Finally, cross-border tax rules measure territoriality through dividend and capital gains exemptions, withholding taxes on international payments, the breadth of bilateral tax treaty networks, and anti-avoidance regulations such as controlled foreign corporation rules, interest deduction limitations, and the ongoing implementation of global minimum tax frameworks.
