The structure of a country’s tax code remains a decisive factor in its overall economic performance, balancing the need to raise sufficient government revenue with the promotion of sustainable economic development. A well-structured tax code is straightforward for taxpayers to navigate and complies with international standards, whereas poorly structured tax systems can impose heavy compliance costs, distort vital economic decisions, and ultimately harm domestic economies.

Recognizing these dynamics, many nations have undertaken significant tax reforms over the past few decades. Across the Organisation for Economic Co-operation and Development (OECD), marginal tax rates on both corporate and individual income have declined substantially. Today, the majority of OECD nations raise a large portion of their public revenues through broad-based mechanisms such as payroll taxes and value-added taxes (VAT).

However, recent shifts in tax policy have not universally improved system structures; some policy directions have introduced fresh headwinds. While nations like Austria have reduced their 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. Meanwhile, improvements to corporate tax bases have been implemented in Canada, Germany, Lithuania, the United Kingdom, and the United States, whereas countries like the Czech Republic and Slovenia have made their corporate bases less competitive. Notably, Germany and Finland are phasing out temporary enhancements to their corporate tax bases that Lithuania, the United Kingdom, and the United States have made permanent and expanded.

Compounding these structural shifts, international tax policy has increasingly drifted away from its traditional roles of raising public revenue and encouraging productive investment. Instead, tax systems are frequently deployed as tools in international trade and diplomatic disputes, with import tariffs, digital service levies, and extraterritorial taxes utilized to exert economic pressure. In this complex environment, policymakers are urged to refocus on neutral, internationally competitive tax policies designed to generate revenue with minimal friction on investment and economic growth. Evaluating these diverse national approaches relative to one another is the core purpose of the International Tax Competitiveness Index (ITCI), a relative comparison of OECD tax systems focusing on competitiveness and neutrality.

The International Tax Competitiveness Index

The International Tax Competitiveness Index seeks to measure the extent to which a country’s tax system adheres to two foundational principles of tax policy: competitiveness and neutrality.

A competitive tax code keeps marginal effective tax rates low. In an increasingly globalized world, capital is highly mobile, and businesses can choose to invest across numerous jurisdictions to secure the highest possible return. Consequently, enterprises naturally look for countries with lower tax burdens on investment to maximize their after-tax profitability. If a nation’s tax rates are excessively high, investment capital is driven elsewhere, resulting in slower domestic economic growth. Furthermore, high marginal tax rates can impede domestic capital formation and encourage tax avoidance strategies. According to long-standing research from the OECD, corporate income taxes are the most harmful for economic growth, followed by personal income taxes and consumption taxes, while taxes on immovable property have the smallest negative impact on economic expansion.

Conversely, a neutral tax code aims to raise the required level of revenue with the fewest possible economic distortions. This means the system does not artificially favor consumption over saving—a pitfall common in systems relying heavily on investment or wealth taxes—and avoids targeted tax breaks or preferential preferences for specific business or individual activities. As tax laws grow increasingly intricate, they tend to lose neutrality. When rules are written such that large corporations or wealthy individuals can alter their behavior to secure special tax advantages, the foundational fairness and neutrality of the system are undermined.

To evaluate whether a country’s tax system achieves these standards, the ITCI analyzes more than 40 distinct tax policy variables. These factors measure not only headline tax rates but also the underlying architecture of corporate taxes, individual income taxes, consumption taxes, property taxes, and the regulatory treatment of overseas earnings. Due to data limitations, recent tax changes in certain countries may not be fully captured in the current edition.

2026 Rankings and Notable Shifts

For the 13th consecutive year, Estonia claims the title of having the best tax code in the OECD. Its leading position is underpinned by four defining features of its fiscal framework: a 22 percent corporate income tax rate applied exclusively to distributed profits rather than retained earnings; a flat 22 percent individual income tax that exempts personal dividend income; a property tax levied solely on the underlying value of land rather than real property or physical capital; and a territorial tax system that completely 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-style corporate tax system, maintains an efficient labor taxation framework. New Zealand features a relatively flat, low-rate individual income tax with a combined top rate of 39 percent that largely exempts capital gains, alongside a broad-based VAT and an absence of inheritance, property transfer, asset, or financial transaction taxes. Switzerland combines a competitive 19.5 percent corporate tax rate with a broad-based, low-rate consumption tax and partial capital gains exemptions. Lithuania levies a low 17 percent corporate tax rate, permits full expensing for machinery and equipment investments, and maintains a flat, low individual income tax structure. Luxembourg applies a broad-based VAT covering 87 percent of final consumption, exempts long-term capital gains without substantial ownership requirements, and features a cross-border regime free of withholding taxes on interest and royalties.

At the opposite end of the spectrum, France ranks as having the least competitive tax system in the OECD. It maintains the highest top corporate tax rate in the developed world at 36.1 percent—inclusive of multiple surtaxes and distortionary production taxes—alongside a complex array of property, estate, bank asset, and financial transaction levies, plus a real estate wealth tax. Colombia follows as the second-least competitive system, hampered by a net wealth tax, a financial transaction tax, a 35 percent corporate income tax that does not broadly exempt foreign-sourced subsidiary earnings, and a narrow VAT base.

Countries ranking poorly on the ITCI typically impose high marginal tax rates on corporate income or rely on multilayered rules that create systemic complexity. Four of the bottom five countries feature higher-than-average combined corporate tax rates and unusually narrow VAT bases that cover only 35 to 50 percent of final consumption. They also tend to lean heavily on narrow, distortionary levies such as digital services taxes, financial transaction taxes, inheritance taxes, and wealth duties.

Notable policy changes across various countries over the past year have influenced individual trajectories. Canada maintained its 15th-place ranking after abolishing its digital services tax, canceling a planned capital gains inclusion rate increase, and restoring full expensing for machinery. Denmark fell from 29th to 31st place after introducing a new personal income tax bracket that elevated its top rate from 55.9 to 60.5 percent. Finland retained its 22nd position, phasing out accelerated depreciation for machinery while reducing its top personal income tax rate from 57 to 50.4 percent. Lithuania maintained its 5th-place rank by raising its corporate tax rate from 16 to 17 percent while introducing permanent full expensing for machinery and equipment. Portugal held steady at 33rd place following incremental reductions in its top corporate tax rate, bringing it down to 29.5 percent. The Slovak Republic saw its ranking slide further from 9th to 12th place after increasing its corporate tax rate to 24 percent, introducing a financial transaction tax, and raising its top personal income tax rate to 44.4 percent. Meanwhile, the United States slipped from 16th to 17th place as it reinstated permanent full expensing for plants and equipment while tightening cross-border rules by removing substance exclusions for foreign-earned multinational income.

Corporate Income Tax Dynamics

Corporate income taxes directly reduce the after-tax rate of return on corporate investment, thereby increasing the cost of capital and dampening overall economic output. Although corporate taxes exert a significant influence on business activity, they account for a relatively modest share of government revenue across the OECD, averaging 11.9 percent of total revenues.

The ITCI evaluates corporate tax systems across three primary subcategories: top statutory rates, cost recovery provisions, and incentives and complexity. France maintains the highest combined top marginal corporate income tax rate in the OECD at 36.1 percent, followed by Colombia at 35 percent and Germany at 30.1 percent. Conversely, Hungary levies the lowest rate at 9 percent, followed by Ireland at 12.5 percent and Lithuania at 17 percent, against an OECD average of 24.2 percent.

Cost recovery rules remain critical in determining how accurately a tax code defines true business profits. Provisions governing loss carryovers allow businesses to smooth earnings and risk across economic cycles. While 22 OECD countries allow indefinite loss carryforwards, others impose strict time limits or deductibility caps. Loss carryback provisions remain far more restrictive, with only Estonia and Latvian systems allowing unlimited carrybacks by design, while the vast majority of OECD nations permit no carrybacks at all.

Regarding capital cost recovery, businesses in most jurisdictions must write off capital investments in machinery, buildings, and intangibles over extended depreciation schedules rather than deducting expenses immediately. This delay diminishes the present value of write-offs due to inflation and the time value of money. On average across the OECD, businesses can write off 85.9 percent of investment costs in machinery, 50.3 percent of industrial buildings, and 78.2 percent of intangibles in real terms. Nations that have embraced permanent full expensing—such as the United Kingdom, the United States, and recently Lithuania—score significantly higher by eliminating tax-induced investment penalties.

Special tax incentives, such as patent boxes and research and development tax credits, continue to draw scrutiny. While intended to stimulate innovation, these targeted provisions frequently introduce economic distortions, complicate tax compliance, and invite rent-seeking behavior and lobbying expenditures. Similarly, the proliferation of digital services taxes across 10 OECD countries and the persistence of gross turnover taxes in several jurisdictions add layers of administrative complexity and economic drag.

Individual Taxation and Labor Market Impacts

Individual income taxes and payroll taxes serve as primary revenue sources for funding government operations and social insurance programs. These taxes directly influence individual decisions regarding labor force participation, hours worked, and savings behavior.

The top statutory personal income tax rate significantly impacts marginal work incentives. Slovenia maintains the highest all-in top statutory personal income tax rate at 61.3 percent, closely followed by Denmark at 60.5 percent and Belgium at 60 percent, while Estonia boasts the lowest at 22 percent. Beyond statutory rates, the economic cost of labor taxation is evaluated through the ratio of the marginal tax wedge to the average tax wedge. High ratios indicate that as workers earn additional income, the tax penalty grows, creating stronger disincentives against increasing work hours.

Capital gains and dividend taxes introduce an additional layer of taxation on corporate profits, creating a structural bias against saving and investment. Dividend tax rates vary widely across the OECD, with Ireland levying the highest top marginal dividend tax rate at 51 percent, compared to an OECD average of 24.7 percent, while Estonia and Latvia maintain a 0 percent rate through their cash-flow corporate tax systems.

Consumption Taxes and Property Levies

General consumption taxes, predominantly structured as value-added taxes, represent one of the most economically efficient methods for raising public revenue when applied broadly across final consumption without cascading impacts on business inputs. OECD consumption tax rates average 19.4 percent, ranging from a high of 27 percent in Hungary to population-weighted sales tax averages of 7.5 percent in the United States. However, exemptions, reduced rates, and high registration thresholds frequently narrow consumption tax bases, requiring higher headline rates to meet revenue needs.

Property taxes encompass recurrent levies on real estate, wealth duties, estate and inheritance taxes, and transaction charges. While recurrent taxes on the unimproved value of land are relatively efficient, taxes that capture the full value of physical capital and buildings increase the cost of capital and discourage structural improvements. Furthermore, wealth taxes, financial transaction taxes, and capital duties introduce substantial economic distortions, reducing capital availability and hindering long-term productivity growth.

Cross-Border Tax Rules in a Globalized Economy

As multinational enterprises expand across international borders, domestic tax codes must navigate complex cross-border rules. A decisive global trend has seen countries shift away from worldwide taxation toward territorial systems, which exempt foreign-earned dividends and capital gains through participation exemptions. Twenty-six OECD countries currently exempt all foreign-sourced dividends received by parent companies, while others maintain hybrid frameworks or impose anti-avoidance rules such as controlled foreign corporation (CFC) regulations and interest deduction limitations.

The international tax landscape is undergoing further transformation with the ongoing implementation of the global minimum tax framework under Pillar Two, featuring income-inclusion rules and undertaxed-profits rules across numerous OECD jurisdictions. These evolving rules, alongside domestic anti-base erosion measures like those in the United States, continue to reshape how multinational corporate profits are taxed worldwide, underscoring the enduring relevance of tax competitiveness and structural neutrality for policymakers navigating the global economy.