Tax Foundation Report Scrutinizes Economic and Fiscal Implications of Extending Key ‘One Big Beautiful Bill Act’ Tax Deductions

The Tax Foundation, a prominent non-partisan tax policy research organization, has released its latest comprehensive analysis, Options for Reforming America’s Tax Code 3.0: A Policymaker’s Guide to Tax Reform Trade-Offs. This new publication meticulously models the economic, distributional, and revenue effects of 86 potential changes to the nation’s tax code, offering invaluable insights for lawmakers contemplating future fiscal adjustments. Among the critical areas examined are four specific tax deductions enacted under the hypothetical "One Big Beautiful Bill Act" (OBBBA) that are slated to expire after 2028: the enhanced senior deduction, the overtime deduction, the tips deduction, and the auto loan interest deduction. These provisions, which have garnered support from across the political spectrum, including from former President Trump, present a significant fiscal and policy dilemma as their sunset approaches.

Should these four "no tax on" provisions be made permanent, the analysis indicates a substantial increase in the primary deficit, projected to reach $577.3 billion from 2027 through 2036. This considerable fiscal impact underscores the gravity of the decisions facing Congress in the coming years. Beyond the direct budgetary costs, the Tax Foundation highlights profound concerns regarding tax code complexity and neutrality. These narrowly tailored deductions, while seemingly offering targeted relief, introduce additional layers of intricacy, create inequities among taxpayers with similar economic standing, and have historically paved the way for further "carveout" proposals that threaten to further muddle the tax system. The report strongly advocates for allowing these temporary provisions to expire, urging Congress to instead pursue broader, more neutral tax reforms that would foster a simpler, fairer, and more economically efficient tax environment.

The Genesis and Impending Sunset of OBBBA Deductions

To fully appreciate the current debate, it is essential to understand the context in which these OBBBA deductions were introduced. While the "One Big Beautiful Bill Act" itself serves as a placeholder for a significant legislative package, it reflects the pattern of major tax reforms, often enacted with temporary provisions. Such acts are typically designed to stimulate economic activity, simplify certain aspects of the tax code, or provide targeted relief to specific demographic or economic groups. However, to manage the immediate budgetary impact or to garner bipartisan support, many provisions are often given sunset dates, making them temporary. This approach allows lawmakers to claim short-term benefits without committing to long-term fiscal consequences, effectively kicking the can down the road.

The OBBBA deductions, enacted to take effect from 2025 through 2028, represent a strategic effort to provide tax relief in areas deemed politically or economically sensitive. The inclusion of an enhanced senior deduction, an overtime deduction, a tips deduction, and an auto loan interest deduction suggests an intent to address concerns related to retirees, working-class compensation, service industry income, and consumer spending on domestic goods. However, the temporary nature of these provisions means that by 2029, without legislative action, they will cease to exist, leading to a de facto tax increase for beneficiaries. This looming deadline creates significant political pressure for extension, despite the reservations raised by fiscal watchdog groups like the Tax Foundation. The political support from figures like President Trump, who often championed tax cuts, and members of both parties, further complicates the legislative calculus, making a simple expiration less likely without considerable debate.

Fiscal Ramifications: A $577 Billion Question Mark

The potential permanence of these four OBBBA deductions carries a hefty price tag, projected at $577.3 billion over the 2027-2036 fiscal window. This figure represents an increase in the primary deficit, which is the government’s budget deficit excluding interest payments on existing debt. A rising primary deficit indicates that the government is not covering its current operational costs through revenue, leading to an expansion of national debt. The Tax Foundation notes that because these provisions interact with one another, their combined cost is marginally smaller than the sum of their individual standalone estimates, a nuance that sometimes gets lost in public discourse but highlights the complex interdependencies within the tax code.

This substantial deficit increase arrives at a time when the nation’s fiscal health is already a subject of intense scrutiny. The existing national debt, fueled by past spending and tax policies, continues to grow, raising concerns about future economic stability, intergenerational equity, and the government’s capacity to respond to unforeseen crises. Proponents of extending these deductions often argue that the economic stimulus generated by lower taxes would offset some of the revenue loss, or that the benefits to taxpayers outweigh the fiscal cost. However, the Tax Foundation’s analysis provides a counter-narrative, suggesting that the economic benefits are modest at best, and the structural damage to the tax code’s integrity is significant. The debate, therefore, extends beyond mere numbers to fundamental principles of fiscal responsibility and optimal tax policy design.

Dissecting the Individual Deductions: Costs, Complexities, and Criticisms

Each of the four OBBBA deductions presents its own set of characteristics, intended beneficiaries, and associated challenges. A deeper examination reveals why the Tax Foundation advocates for their expiration.

1. Make Permanent the Deduction of Overtime Pay from Taxable Income (Option 34)

• Current Provisions: From 2025 through 2028, taxpayers can deduct up to $12,500 of qualified overtime pay ($25,000 for married couples filing jointly). Critically, this deduction applies only to the "half" portion of time-and-a-half overtime pay, as mandated by the Fair Labor Standards Act (FLSA). This means if a worker earns $30/hour normally and $45/hour for overtime, only the $15 "extra" portion is considered for the deduction, not the full $45.
• Eligibility & Phase-outs: The deduction is available to both itemizers and non-itemizers, broadening its reach. However, it begins to phase out when a taxpayer’s modified adjusted gross income (MAGI) exceeds $150,000 for single filers and $300,000 for joint filers, limiting its benefit for higher earners.
• Fiscal & Economic Impact: Making this deduction permanent would increase the primary deficit by an estimated $372.4 billion over 10 years. Economically, it’s projected to increase the long-run size of the economy by a modest 0.1 percent, primarily by lowering marginal tax rates for eligible workers not caught in the phase-out range. The policy’s intent was likely to incentivize work and reward those putting in extra hours.
• Challenges & Criticisms: This deduction has caused considerable confusion for both workers and employers regarding what specific types of overtime pay qualify. Its non-neutrality is a significant concern: two workers earning the exact same total compensation (e.g., $50,000), but with one receiving $5,000 of that as qualified overtime, will face different tax liabilities. This distorts economic decisions and creates an uneven playing field. Furthermore, it adds administrative burden for employers tasked with correctly identifying and reporting eligible overtime pay, and for the IRS in enforcing these complex rules. The potential for reclassification of regular wages as "overtime" to exploit the deduction also poses a compliance risk.

2. Make Permanent the Deduction for Auto Loan Interest Paid (Option 36)

• Current Provisions: Taxpayers can deduct up to $10,000 for interest paid on certain auto loans from 2025 through 2028. Key restrictions include that the loan must be for a new vehicle, and the vehicle’s final assembly must occur in the United States, indicating a "buy American" incentive.
• Eligibility & Phase-outs: Like the overtime deduction, it’s available to both itemizers and non-itemizers. It phases out when MAGI surpasses $100,000 for single filers and $200,000 for joint filers.
• Fiscal & Economic Impact: Permanently extending this deduction would add $33.7 billion to the primary deficit over 10 years. The economic impact is projected to be a slight decrease in the long-run size of the economy (less than 0.05 percent). While it lowers marginal tax rates for eligible borrowers, the marginal tax increases for taxpayers in the phase-out range effectively cancel out any positive economic effects.
• Challenges & Criticisms: Auto lenders have reported significant difficulties complying with the law’s reporting obligations, and taxpayers have struggled to determine which vehicles qualify. The deduction contributes to an "uneven patchwork" in the tax code, where certain forms of interest (mortgage, student loans, now specific auto loans) are deductible, while others, like credit card interest, are not. This creates distortions in consumer financial behavior, potentially incentivizing debt in specific areas over others, and lacks a coherent economic rationale for singling out new, domestically assembled vehicles. It also arguably benefits higher-income individuals who can afford new cars and have sufficient interest payments to deduct, while lower-income individuals might not qualify or benefit as much.

3. Make Permanent the Enhanced Senior Deduction (Option 33)

• Current Provisions: From 2025 through 2028, taxpayers aged 65 and over can claim an additional $6,000 deduction. This is an extra benefit on top of other potential deductions.
• Eligibility & Phase-outs: Available to both itemizers and non-itemizers, it begins to phase out when MAGI exceeds $75,000 for single filers and $150,000 for joint filers. It is scheduled to expire in 2029.
• Fiscal & Economic Impact: Making this permanent would increase the primary deficit by $137.9 billion over 10 years. The long-run economic impact is minimal (less than 0.05 percent increase), as it primarily benefits retired workers who are less engaged in the labor force. It lowers marginal rates for seniors not in the phase-out range but raises them for those subject to the phase-out.
• Challenges & Criticisms: This deduction clutters the tax code and is easily confused with the existing additional standard deduction for taxpayers age 65 and older, leading to potential administrative errors and taxpayer frustration. More critically, it weakens the Social Security trust fund by reducing taxes paid on Social Security benefits that are remitted to the fund, potentially exacerbating long-term solvency challenges for the program. The deduction tends to benefit lower-middle and middle-income seniors, as lower-income filers often have no tax liability after the standard deduction, and higher-income filers are limited by the phase-out. This raises questions about its true effectiveness in targeting those most in need.

4. Make Permanent the Deduction of Tip Income from Taxable Income (Option 35)

• Current Provisions: Workers earning tipped income can deduct up to $25,000 in tips from 2025 through 2028.
• Eligibility & Phase-outs: The deduction phases out when MAGI exceeds $150,000 for single filers and $300,000 for joint filers.
• Fiscal & Economic Impact: Permanence would increase the primary deficit by $45.9 billion on a conventional basis. The long-run economic impact is projected to be a negligible increase (less than 0.05 percent) by lowering marginal rates for some workers.
• Challenges & Criticisms: This deduction is highly specific, available only for an arbitrary subset of labor compensation. It necessitates detailed rules to define which occupations qualify and guardrails to prevent the reclassification of regular wage income as "tips" to exploit the deduction. Similar to the overtime deduction, it creates non-neutrality: two workers providing similar services and receiving the same total compensation could pay different amounts of tax if one receives a significant portion of their pay in qualified tips. Furthermore, the Tax Foundation notes it provides little benefit to filers in the bottom 20 percent of income, as the standard deduction often already offsets most of their tax liability. This raises concerns about its equity and effectiveness as a targeted relief measure. The historical complexities of accurately reporting tip income, both for workers and employers, are well-documented, and this deduction only adds another layer of administrative difficulty.

Broader Implications: The Erosion of Simplicity and Neutrality

The overarching critique from the Tax Foundation is that these "no tax on" deductions exemplify the drawbacks of using narrowly tailored provisions for tax relief. While politically appealing, such provisions fundamentally undermine the principles of a sound tax code: simplicity, neutrality, and equity.

• Complexity: Each deduction adds new definitions, eligibility criteria, phase-out ranges, and reporting requirements. This increased complexity makes the tax code harder for ordinary taxpayers to understand, harder for businesses to comply with, and harder for the IRS to administer and enforce. It leads to higher compliance costs for individuals and businesses, increases the likelihood of errors, and creates opportunities for aggressive tax planning to exploit loopholes.
• Non-Neutrality: A neutral tax code treats similar forms of income and similar economic activities in the same way, minimizing distortions in economic decision-making. These deductions, however, explicitly favor certain types of income (overtime, tips) or expenditures (new US-assembled auto loans) or demographics (seniors) over others. This means two individuals with the same overall income and economic capacity could pay vastly different amounts of tax based on how their income is structured or how they choose to spend money. This non-neutrality can distort labor markets, investment decisions, and consumer choices, leading to an inefficient allocation of resources.
• The "Carveout" Cascade: The Tax Foundation warns that these temporary deductions have already "inspired additional carveout proposals." This phenomenon is common in tax policy; once a specific group or activity receives a special tax break, other groups will lobby for similar treatment, leading to a proliferation of targeted provisions. This creates a vicious cycle that further erodes the tax base, increases complexity, and makes comprehensive reform even more challenging.

Political Landscape and the Path Forward

As the 2028 expiration date draws nearer, Congress faces a critical juncture. The bipartisan support for these provisions, combined with the natural inclination to avoid a perceived tax increase for constituents, creates strong political momentum for their extension. However, extending these deductions without corresponding revenue offsets would exacerbate the nation’s already precarious fiscal situation.

The Tax Foundation’s recommendation is clear: rather than extending these temporary carveouts, Congress should allow them to expire after 2028. Instead, the focus should shift to broader, more neutral tax reforms. Such reforms would aim to:

• Simplify the Tax Code: Reduce the number of special deductions, credits, and exemptions to make the system easier to understand and comply with.
• Enhance Neutrality: Ensure that similar income is taxed similarly, reducing distortions and allowing economic decisions to be driven by market forces rather than tax incentives.
• Improve Efficiency: A simpler, more neutral tax code can lower compliance costs, reduce opportunities for tax avoidance, and foster greater economic growth.
• Strengthen the Fiscal Foundation: By eliminating costly, targeted breaks, revenue could be preserved or reallocated to address pressing national needs, or used to fund broader, more impactful tax rate reductions.

The debate over these expiring deductions is not merely about their individual costs or benefits but reflects a larger philosophical conflict within tax policy: whether to pursue targeted interventions that often introduce complexity and distortion, or to embrace a simpler, more neutral framework that promotes overall economic efficiency and fairness. The Tax Foundation’s latest report serves as a timely reminder of these fundamental trade-offs and urges policymakers to consider the long-term implications of their choices for America’s tax system and its economic future.