Candice Horbacz
New data released by the Internal Revenue Service (IRS) for tax year 2023 unequivocally demonstrates the enduring progressive structure of the U.S. federal income tax system, with high-income taxpayers continuing to bear the largest share of the nation’s income tax burden through higher average rates. The findings reveal that average tax rates across all income strata remained consistent with 2022 levels, notably staying below the rates observed prior to the landmark 2017 Tax Cuts and Jobs Act (TCJA). This consistency underscores a stable, albeit lower, tax landscape in the post-TCJA era, even as the economy continues to evolve.
The concept of a progressive tax system is fundamental to understanding these findings. It means that individuals and households with higher incomes pay a larger percentage of their income in taxes compared to those with lower incomes. This is achieved through a tiered system of tax brackets, where marginal tax rates increase as taxable income rises. The IRS data for 2023 serves as a clear affirmation of this principle in action within the federal income tax framework.
Reported Income and Taxes Paid in Tax Year 2023: A Detailed Overview
In tax year 2023, American taxpayers reported a staggering nearly $15.2 trillion in Adjusted Gross Income (AGI) across 153.1 million tax returns. This represents a significant increase of $445 billion in AGI compared to 2022, despite a slight reduction of almost 725,000 fewer returns filed. This indicates a general increase in income per return, potentially reflecting a robust labor market, wage growth, and investment gains throughout the year. Total income taxes paid also saw a modest rise, increasing by $8 billion (0.4 percent) to reach $2.14 trillion. Consequently, the average individual income tax rate experienced a slight dip, easing from 14.5 percent in 2022 to 14.1 percent in 2023.
This marginal decrease in the average individual income tax rate, despite an increase in aggregate AGI and total taxes paid, suggests that the growth in income might have outpaced the growth in tax liability for some segments, or that the effective rate structure maintained its lower post-TCJA stance. It is crucial to note that AGI, while a widely used metric, is a relatively narrow income concept. It does not encompass all forms of income, such as certain government transfers, the value of employer-provided health insurance, municipal bond interest, or unreported income, which can influence a broader understanding of economic well-being and tax capacity.
A critical nuance in interpreting these figures lies in the treatment of refundable tax credits. The Office of Management and Budget (OMB) classifies the refundable portion of these credits as spending rather than a reduction in tax liability. As a result, the IRS does not include these amounts in its tax share calculations. This methodological choice inherently overstates the tax burden attributed to the bottom half of taxpayers, as the benefits they receive from these credits (like the Earned Income Tax Credit or certain child tax credits) are not fully reflected in their net tax liability in these specific IRS statistics. If these refundable portions were included, the average tax rate for lower-income groups would appear even lower, and consequently, the share of taxes paid by higher-income groups would appear even greater.
Dissecting Progressivity: Who Pays What?
The IRS data provides granular detail on how the tax burden is distributed across different income percentiles. The findings reinforce the steep gradient of the progressive system:
- Bottom 50%: Taxpayers earning below an AGI of $53,801 faced an average income tax rate of 3.7 percent. This group, while representing half of all taxpayers, contributed 12.3 percent of the total AGI but paid only 3.3 percent of all federal individual income taxes.
- Middle-to-Upper Income Brackets: As income rises, so does the average tax rate. For instance, taxpayers with AGI between the 10th and 5th percentiles (i.e., those with AGIs between $187,608 and $272,209) paid an average income tax rate of 14.2 percent. This is nearly four times the rate paid by those in the bottom half.
- Top 1%: The most significant contributions come from the highest earners. Taxpayers in the top 1 percent, defined by an AGI of $675,602 and above, paid the highest average income tax rate of 26.3 percent. This rate is seven times higher than the rate faced by the bottom half of taxpayers. This elite group, comprising just 1.5 million tax returns, earned 20.6 percent of total AGI but contributed a substantial 38.4 percent of all federal income taxes.
- The Very Top: Even within the top 1 percent, there’s a slight variation. For the top 0.001 percent (approximately 1,531 returns reporting more than $78.6 million in AGI), the average rate fell slightly to 23.6 percent in 2023. While a minor dip, it still represents more than six times the average rate for the bottom half of taxpayers, indicating that even at the very pinnacle of income, the progressive structure largely holds, albeit with some unique dynamics often tied to capital gains and specific deductions.
To put the top 1 percent’s contribution into stark perspective: this small segment of taxpayers accounted for nearly as much in income taxes paid as the bottom 95 percent combined. The top 1 percent paid $823 billion in income taxes, while the bottom 95 percent paid $872 million. This concentration of tax liability among the highest earners is a defining characteristic of the U.S. federal income tax system.
Historical Context: The Impact of the TCJA and Pandemic Shifts
The 2023 tax year marks the sixth year since the implementation of the 2017 Tax Cuts and Jobs Act (TCJA), a significant legislative overhaul that introduced numerous temporary changes to the individual income tax code. The TCJA aimed to stimulate economic growth by lowering tax rates across most brackets, widening tax brackets to prevent "bracket creep," substantially increasing the standard deduction, and enhancing the child tax credit. The overarching goal was to reduce the tax burden for individuals and businesses.
The IRS data confirms that the TCJA largely achieved its immediate objective of lowering tax burdens, on average, for taxpayers across all income levels. Despite some fluctuations in average tax rates over the past few years due driven by economic growth and income changes, the 2023 rates remain demonstrably below their pre-TCJA levels (2017) for every income group.
The period between 2020 and 2021 also presented unique challenges and policy responses due to the coronavirus pandemic. During these years, significant income and tax policy changes were enacted to provide economic relief, which resulted in notable shifts in tax shares. For instance, the share of income taxes paid by the top 1 percent peaked at 45.8 percent in 2021, an outlier largely attributed to increased capital gains realizations, which reached their highest level in 40 years during that period of market volatility and recovery.
Looking at a longer timeline, the share of income taxes paid by the top 1 percent has generally been on an upward trajectory, increasing from 33.2 percent in 2001 to 38.4 percent in 2023. Conversely, the share of income taxes paid by the bottom 50 percent of taxpayers has seen a decline over the same period, falling from 4.9 percent in 2001 to 3.3 percent in 2023. These trends reflect not only changes in tax policy but also shifts in income distribution over the past two decades.
The share of adjusted gross income reported by the top 1 percent also grew from 17.4 percent in 2001 to 20.6 percent in 2023, returning to levels similar to those observed before the pandemic. The AGI share of the highest earners tends to be more volatile and responsive to business cycles, experiencing more pronounced rises and falls compared to other income groups. Meanwhile, the share of AGI reported by the bottom 50 percent of taxpayers decreased from 14.4 percent in 2001 to 12.3 percent in 2023, generally declining until 2020 before showing a slight recovery in recent years to its highest level since 2006. These long-term trends underscore persistent debates about income inequality and the role of the tax system in addressing it.
Broader Implications and Future Outlook
The IRS data offers critical insights for policymakers, economists, and the public regarding the fairness, efficiency, and revenue-generating capacity of the federal income tax system. The continued progressivity of the system ensures that a significant portion of federal revenue is collected from those with the highest ability to pay, supporting essential government services and programs.
However, the analysis also highlights the complexities of tax policy. The temporary nature of many TCJA provisions has long been a point of discussion. While the original legislation set many individual tax cuts to expire after 2025, the recent enactment of the "One Big Beautiful Bill Act" (OBBBA) in July 2025 extended these temporary changes. This extension, while not impacting the 2023 data directly, sets the stage for the tax landscape of future years, ensuring that the lower average tax rates across income groups are likely to persist beyond their original sunset date. This legislative action will undoubtedly influence federal revenue projections and future economic behavior.
Furthermore, it is essential to contextualize the federal individual income tax within the broader U.S. tax system. While the federal income tax is responsible for over 25 percent of the nation’s total taxes paid (across all levels of government) and is highly progressive, other significant taxes, such as federal payroll taxes (accounting for about 20 percent of all taxes paid), are generally less progressive. Similarly, many state and local taxes, which often rely heavily on sales and property taxes, can be regressive, meaning they consume a larger percentage of income from lower-income households. Therefore, evaluating the overall progressivity of the entire U.S. tax system requires considering all tax types, not just federal income tax.
The distinction between the "legal incidence" and "economic incidence" of taxes is also relevant. The IRS figures represent the legal incidence – who is legally responsible for paying the tax. However, economic analysis often suggests that the actual burden (economic incidence) of taxes can be shifted, for example, from businesses to consumers or employees. Most distributional tables from institutions like the Congressional Budget Office (CBO) and the Tax Policy Center typically assume that the entire economic incidence of personal income taxes falls on the income earner, aligning with the IRS’s legal incidence perspective presented here.
In conclusion, the 2023 IRS data reaffirms the progressive nature of the U.S. federal income tax system, with high-income taxpayers continuing to contribute a disproportionately large share of income tax revenue. The enduring impact of the TCJA is evident in the sustained lower average tax rates compared to pre-2017 levels. As policymakers navigate future fiscal challenges and debates about economic equity, these detailed statistics provide a crucial foundation for informed decision-making regarding the nation’s tax structure. The ongoing monitoring of these trends will be vital to understanding the evolving dynamics of income distribution and tax burden in the United States.
