Candice Horbacz
The Tax Foundation’s recently published book, Options for Reforming America’s Tax Code 3.0: A Policymaker’s Guide to Tax Reform Trade-Offs, provides an exhaustive analysis of 86 potential modifications to the U.S. tax code, meticulously modeling their economic, distributional, and revenue impacts. Among the critical areas explored are four specific tax deductions, introduced under what the book refers to as the "One Big Beautiful Bill Act (OBBBA)," which are slated to expire after 2028. These provisions—the enhanced senior deduction, the overtime deduction, the tips deduction, and the auto loan interest deduction—have garnered significant attention, with support for their extension voiced by figures such as former President Trump and members of Congress across the political spectrum. However, extending these "no tax on" provisions carries substantial fiscal costs and raises fundamental questions about tax code complexity and neutrality, as highlighted by the Tax Foundation’s research.
The Looming Sunset: Understanding the OBBBA Provisions and Their Political Landscape
The four deductions in question were designed as temporary measures, generally effective from 2025 through 2028, with the enhanced senior deduction specifically set to expire in 2029. The concept of temporary tax provisions, often featuring "sunset clauses," is a common legislative tool. These clauses allow policymakers to introduce tax cuts or incentives without locking in permanent revenue losses, providing an opportunity for future review based on their effectiveness and fiscal sustainability. However, temporary provisions frequently create political pressure for extension as their expiration date approaches, particularly when they benefit specific constituencies or industries.
The political discourse surrounding these particular deductions underscores this dynamic. President Trump’s public backing, coupled with reported bipartisan interest in Congress, signals a strong push to make these temporary cuts permanent. Proponents often argue that these deductions offer targeted relief to specific groups—seniors, hardworking individuals earning overtime, service industry workers, and those purchasing new American-made vehicles—thereby stimulating economic activity or alleviating financial burdens. The "no tax on" moniker itself is a powerful rhetorical device, suggesting a straightforward benefit to taxpayers. Yet, the Tax Foundation’s analysis delves beyond the immediate appeal, scrutinizing the broader implications of such extensions.
A Significant Fiscal Burden: The Cumulative Cost of Extension
The financial implications of extending these four OBBBA deductions are substantial. According to the Tax Foundation’s conventional scoring, making them permanent would cumulatively increase the primary deficit by an estimated $577.3 billion over the 10-year budget window from 2027 through 2036. This figure represents a significant claim on future federal revenue and adds to the nation’s burgeoning debt. It is crucial to note that the combined cost is projected to be slightly smaller than the sum of their individual standalone estimates. This phenomenon is due to interactions between the provisions within the complex framework of the tax code, where one deduction might reduce the taxable income that another deduction would otherwise apply to, or affect the number of taxpayers eligible for another provision.
Beyond the immediate fiscal cost, the report emphasizes that these deductions contribute to a more intricate and less neutral tax system. Tax neutrality, a cornerstone of sound tax policy, suggests that the tax code should interfere as little as possible with economic decisions, avoiding preferential treatment for specific activities, industries, or forms of income. These targeted deductions, however, inherently create preferences, leading to distortions in economic behavior and inspiring calls for additional "carveout" proposals, further exacerbating the code’s complexity.
Deep Dive into Individual Provisions: Costs, Complexities, and Criticisms
Each of the four deductions presents its own set of unique characteristics, benefits, and drawbacks. The Tax Foundation’s detailed modeling provides insights into why extending them might not align with principles of efficient and equitable tax policy.
The Overtime Pay Deduction: Incentivizing Work, Complicating Compliance
Option 34 in the Tax Foundation’s guide specifically addresses making permanent the deduction of overtime pay from taxable income. From 2025 to 2028, eligible taxpayers can deduct up to $12,500 of qualified overtime pay ($25,000 for married couples filing jointly). A key detail is that this deduction applies only to the "half" portion of time-and-a-half overtime pay mandated by the Fair Labor Standards Act (FLSA). For instance, if a worker earns $30/hour and works 10 hours of overtime, their overtime pay is $450 ($30 1.5 10 hours). The deduction would apply to the $150 "half" portion of that overtime, meaning the extra premium paid for working beyond standard hours.
The deduction is available to both itemizers and non-itemizers, broadening its potential reach. However, it phases out for single filers with modified adjusted gross income (MAGI) above $150,000 and joint filers above $300,000.
Making this deduction permanent would incur a substantial fiscal cost, increasing the primary deficit by an estimated $372.4 billion over 10 years on a conventional basis. From an economic perspective, the Tax Foundation projects a modest long-run increase in the size of the economy by 0.1 percent, primarily by lowering marginal tax rates for eligible workers who are not in the phaseout range. This could, theoretically, incentivize more individuals to work overtime.
However, the implementation of this deduction has been fraught with difficulties. Reports from tax practitioners and media outlets indicate significant confusion among both workers and employers regarding what constitutes "qualified" overtime pay, particularly concerning the distinction between the regular rate and the premium "half" portion. This ambiguity has led to compliance challenges and potential misapplication of the deduction. Furthermore, the overtime deduction introduces a clear non-neutrality into the tax code. Consider two individuals earning the same total compensation of $50,000. If one earns $5,000 of that through qualified overtime, they will pay less in taxes than the other worker whose entire $50,000 comes from regular wages. This creates an uneven playing field based on the composition of income rather than the total amount earned, complicating tax planning and potentially distorting labor market decisions.
The Auto Loan Interest Deduction: Driving Sales, Challenging Implementation
Option 36 evaluates the permanence of the deduction for auto loan interest paid. Currently active from 2025 through 2028, this provision allows taxpayers to deduct up to $10,000 in interest paid on loans for new vehicles, with a specific caveat: the vehicle’s final assembly must occur in the United States. This domestic assembly requirement is a clear example of how tax provisions can be used to promote specific industrial policies, aiming to support American manufacturing jobs.
Similar to the overtime deduction, this benefit is accessible to both itemizers and non-itemizers, and it features a phaseout beginning at a MAGI of $100,000 for single filers and $200,000 for joint filers.
Extending this deduction permanently would add an estimated $33.7 billion to the primary deficit over 10 years. While it might offer a slight reduction in marginal tax rates for eligible borrowers, the Tax Foundation’s analysis indicates that any potential positive economic effects are likely to be canceled out by marginal tax increases for taxpayers caught in the phaseout range. Consequently, a permanent auto loan interest deduction is projected to decrease the long-run size of the economy by less than 0.05 percent, suggesting minimal, if any, net economic benefit.
Operationally, this deduction has also faced hurdles. Auto lenders have reported significant challenges in complying with the reporting obligations associated with the law, citing complexities in verifying vehicle assembly origins and tracking eligible interest payments. Taxpayers, in turn, have expressed confusion regarding which specific vehicles qualify for the deduction, leading to potential misinterpretations and administrative burdens. Moreover, the auto loan interest deduction contributes to an already inconsistent landscape of consumer interest deductions. While certain mortgage interest, student loan interest, and now specific auto loan interest are deductible, other common forms of consumer interest, such as credit card interest, remain non-deductible. This "patchwork" approach creates arbitrary distinctions and undermines the principle of a broad, neutral tax base.
The Enhanced Senior Deduction: Targeting Relief, Impacting Social Security
Option 33 focuses on making the enhanced senior deduction permanent. From 2025 through 2028, taxpayers aged 65 and over are eligible to claim an additional $6,000 deduction. This deduction is also available to both itemizers and non-itemizers and begins to phase out when the taxpayer’s MAGI exceeds $75,000 for single filers and $150,000 for joint filers. Unlike the other deductions, which expire after 2028, this specific provision is scheduled to sunset in 2029.
Making this deduction a permanent fixture would increase the primary deficit by an estimated $137.9 billion over 10 years. The Tax Foundation projects a long-run increase in the size of the economy by less than 0.05 percent, resulting from lower marginal tax rates for seniors outside the phaseout range. However, for those within the phaseout, it would effectively raise marginal tax rates. The overall economic impact is smaller compared to other labor-related tax changes, primarily because this deduction disproportionately benefits retired workers, who generally have a lower labor force participation rate.
Analysis suggests this deduction tends to benefit filers in the lower-middle and middle-income quintiles. Lower-income seniors often have little to no tax liability after accounting for the standard deduction, while higher-income seniors are limited by the deduction’s phaseout thresholds. A significant concern raised by the Tax Foundation is the deduction’s potential to weaken the Social Security trust fund. By reducing taxes paid on Social Security benefits, which are typically remitted to the fund, this deduction indirectly impacts the solvency of a critical federal program. Furthermore, the enhanced senior deduction adds another layer of complexity, potentially causing confusion with the long-standing "additional standard deduction" already available for taxpayers aged 65 and older. This overlap creates unnecessary duplication and complicates tax preparation for an demographic that often seeks simplicity.
The Tipped Income Deduction: Supporting Service, Raising Equity Concerns
Option 35 examines the proposal to make permanent the deduction of tip income from taxable income. This provision, in effect from 2025 through 2028, allows workers earning tipped income to deduct up to $25,000 in tips. The deduction phases out when MAGI exceeds $150,000 for single filers and $300,000 for joint filers.
Permanently extending this deduction would increase the primary deficit by an estimated $45.9 billion on a conventional basis over 10 years. The long-run size of the economy is projected to increase by less than 0.05 percent, primarily due to marginal rate reductions for some tipped workers. This deduction aims to provide tax relief to a segment of the workforce heavily reliant on tips, such as those in the hospitality industry.
However, the tipped income deduction faces several criticisms concerning its design and equity. It targets an arbitrary subset of labor compensation, necessitating intricate rules to define which occupations qualify and to prevent the re-categorization of other forms of labor income as tips to exploit the deduction. This raises questions of fairness and creates opportunities for tax avoidance. For example, two individuals providing comparable services and earning the same total compensation could face different tax burdens if one receives a significant portion of their income in "qualified tips" while the other is paid entirely in wages. Such a disparity undermines tax equity.
Moreover, the Tax Foundation notes that this deduction provides little to no tangible benefit for filers in the bottom 20 percent of income. For many low-income workers, the existing standard deduction already offsets most, if not all, of their tax liability, rendering the additional tipped income deduction largely superfluous. This suggests that the deduction may not effectively target those most in need of tax relief, instead disproportionately benefiting higher-earning tipped workers.
Broader Implications: Complexity, Neutrality, and the Future of Tax Reform
The collective analysis of these four "no tax on" deductions underscores broader challenges in tax policy. The Tax Foundation argues that using narrowly tailored provisions to deliver tax relief, while politically appealing, often introduces significant drawbacks. While the combined effect of making these deductions permanent might modestly increase the long-run size of the economy, this comes at the cost of retaining complex phaseouts that can perversely raise marginal tax rates for some taxpayers, leading to eligibility disputes and treating otherwise similar taxpayers differently based on the source or nature of their income.
The foundational principle of a good tax system—simplicity, neutrality, efficiency, and fairness—is challenged by such targeted carveouts. A tax code riddled with special deductions, exemptions, and credits becomes difficult for taxpayers to understand, costly for businesses to comply with, and cumbersome for the government to administer. It also creates avenues for tax planning that prioritize tax minimization over economically productive activities.
The book Options for Reforming America’s Tax Code 3.0 serves as a guide for policymakers grappling with these trade-offs. It implicitly critiques the temptation to layer new, temporary provisions onto an already complex system, especially when those provisions contribute to non-neutrality and administrative burdens.
The Path Forward: Calls for Comprehensive Reform
In conclusion, the Tax Foundation’s research strongly suggests that rather than extending these temporary and narrowly targeted OBBBA deductions, Congress should allow them to expire as scheduled after 2028. The report advocates for a pivot towards broader, more neutral tax reforms. A simpler tax code, characterized by fewer specific provisions and a more consistent treatment of similar income, would not only reduce compliance burdens for individuals and businesses but also minimize opportunities for tax planning solely aimed at exploiting loopholes. Such a reformed system would provide a more durable and predictable foundation for pro-growth tax policy, fostering economic efficiency and equity. The debate surrounding these expiring deductions is therefore not just about specific tax cuts but about the fundamental direction of U.S. tax policy and its long-term impact on the economy and society.
Note: Reform options presented within Options for Reforming America’s Tax Code 3.0 illustrate the economic, revenue, and distributional tradeoffs of each tax option and are not necessarily endorsed or opposed by Tax Foundation.
