By Nana Muazin 
For decades, a prevailing narrative in American political discourse has suggested that the U.S. tax code is insufficiently progressive—that it favors the wealthy while placing an outsized burden on the working and middle classes. However, a groundbreaking new study from the Fraser Institute challenges this conventional wisdom. By analyzing tax structures across 33 Organisation for Economic Co-operation and Development (OECD) economies, the report concludes that the United States possesses the most progressive tax system of all jurisdictions studied.
This finding adds a critical layer to the ongoing debate over fiscal policy. As policymakers in Washington and state capitals consider future tax reforms, the Fraser Institute’s data suggests that the U.S. system is already calibrated to place a significantly higher relative burden on high-income earners than the systems of its international peers.
The Complexity of Measuring Progressivity
Measuring the "progressivity" of a tax system is notoriously difficult. Tax codes are multifaceted, often conflated with broader government transfer programs, social spending, and welfare policies. In many countries, high taxes on the wealthy are offset by expansive government benefits, while in others, low taxes are coupled with minimal public services.
The Fraser Institute study sought to untangle this knot by creating a specialized index. Rather than looking at the ultimate "fiscal incidence"—which considers how tax revenue is spent—the study focuses exclusively on the design of the tax code. By isolating tax policy from spending policy, the index provides a cleaner look at how countries raise their revenue, offering a more precise tool for international comparison.
Chronology and Methodology: How the Index Was Built
To ensure a rigorous comparison, the researchers developed an index based on five distinct metrics, sampling 45 jurisdictions across 33 OECD countries (excluding nations like Mexico and Chile due to data gaps). The index was designed to be both comprehensive and replicable.
The Five Pillars of the Index
The methodology centers on key indicators that define how a tax system treats different income levels:
- Marginal PIT Rate Range: Measuring the spread between the lowest and highest statutory Personal Income Tax (PIT) rates.
- Distance to Top Bracket: Evaluating how quickly an earner reaches the top marginal tax rate relative to the average wage.
- Low-Income Tax Protection: Assessing the value of standard deductions and exemptions for the lowest earners.
- Income Tax Share of Revenue: Measuring the reliance on progressive income taxes versus other forms of revenue.
- Consumption Tax Share of Revenue: Analyzing the degree to which a country relies on regressive consumption taxes (like Value Added Taxes, or VAT).
To ensure the U.S. representation was accurate, the study analyzed states like California and Texas—the former representing high-tax, high-progressivity environments, and the latter representing low-tax, no-income-tax environments. By calculating federal and state PIT structures together, the study accounted for the substantial authority subnational governments hold in the U.S. fiscal landscape.
Supporting Data: Where the U.S. Stands
The results of the Fraser Institute’s rankings were striking. California topped the list as the single most progressive jurisdiction in the OECD. Texas, despite its reputation for low taxes, still ranked fourth globally, trailing only Newfoundland & Labrador and Korea.
The U.S. success in these rankings is driven largely by two factors: the high reliance on income taxes and the notable absence of a federal Value Added Tax (VAT). In the OECD, many countries rely heavily on VATs, which are generally considered regressive because lower-income households spend a larger share of their income on consumption. Because the U.S. lacks such a national consumption tax, its tax revenue is skewed heavily toward progressive income-based levies.
Furthermore, in the "income tax share of tax revenue" category, the United States ranks second only to Denmark. This suggests that the U.S. federal government is significantly more reliant on taxing individual income to fund its operations than most of its global counterparts, placing it at the forefront of progressive revenue collection.
The Strengths and Weaknesses of the Index
The Fraser Institute’s approach is praised for its ability to isolate "tax structure" from "redistribution." By focusing on how revenue is raised, the index highlights the specific mechanisms that define a country’s tax burden.
However, the study also acknowledges its limitations. Critics point out that the index relies heavily on statutory rates and standard deductions, often failing to account for the impact of tax credits. In the United States, refundable tax credits (such as the Earned Income Tax Credit or the Child Tax Credit) are powerful tools for progressivity. By ignoring these, the index may understate the true relief provided to lower-income households.
Moreover, the index faces challenges regarding international reporting standards. For instance, the U.S. "pass-through" sector—where business income is taxed under the individual income tax code—inflates the measured income concentration of the wealthy. Without adjusting for how different countries report business versus personal income, comparisons can sometimes reflect administrative differences rather than true economic disparity.
Implications for Future Policy
The findings of the Fraser Institute have profound implications for the U.S. policy agenda. As the debate over the future of the Tax Cuts and Jobs Act (TCJA) and other fiscal measures intensifies, the data serves as a cautionary tale.
1. The Diminishing Returns of Higher Rates
The study echoes warnings from economic experts regarding the "Laffer Curve" effect. As marginal tax rates increase, the potential for economic growth can decrease, and the incentive for tax avoidance grows. When a system is already among the most progressive in the world, further increasing marginal rates may yield diminishing returns—collecting little additional revenue while potentially stifling private investment.
2. The Global Context
Policymakers often compare the U.S. to European social democracies, assuming that these nations have more progressive tax codes. The Fraser Institute’s findings suggest that the opposite is true: the U.S. is already at the extreme end of the progressivity spectrum. Understanding this international context is vital for those who claim the U.S. is "lagging" in fairness. If the U.S. is already the most progressive, the question may no longer be about "making the rich pay more," but about the efficiency of the current structure.
3. Structural Reform vs. Rate Hikes
The study suggests that if the U.S. wishes to address inequality, it might look toward structural reforms rather than simply raising rates on top earners. By streamlining the tax code, reducing the complexity of the pass-through sector, and perhaps better utilizing tax credits, the U.S. could maintain its high ranking in progressivity while fostering a more stable and efficient economic environment.
The Bottom Line
The Fraser Institute’s report provides a necessary, data-driven perspective on a heated political topic. While no single index can capture the entirety of a nation’s fiscal health, the consistency of these findings—pointing toward the U.S. as a global leader in progressive taxation—cannot be ignored.
For taxpayers and policymakers alike, the lesson is clear: the U.S. tax system is not the "flat" or "regressive" outlier that critics often claim. On the contrary, it is a highly tuned, progressive engine. As the country moves toward future fiscal decisions, recognizing this reality is essential to crafting policy that balances the need for revenue with the necessity of a vibrant, competitive, and growing economy.
By grounding the conversation in international benchmarks, the Fraser Institute has provided a framework that challenges the status quo and encourages a more nuanced, evidence-based approach to the future of American taxation.
Neng Nana 
Nana 