As the 2028 expiration date for the provisions established under the "One Big Beautiful Bill Act" (OBBBA) approaches, Washington is bracing for a significant fiscal debate. A new comprehensive study by the Tax Foundation, titled Options for Reforming America’s Tax Code 3.0: A Policymaker’s Guide to Tax Reform Trade-Offs, provides a sobering look at the economic and revenue consequences of making these temporary tax cuts permanent.
The study models 86 potential changes to the federal tax code, with a spotlight on four specific "no tax on" provisions that have garnered bipartisan support: the overtime pay deduction, the auto loan interest deduction, the tips deduction, and the enhanced senior deduction. While these measures are framed as popular relief for working families and retirees, the Tax Foundation’s analysis suggests that they come at a steep price: a cumulative $577.3 billion increase in the primary deficit between 2027 and 2036.
The Core Provisions Under Review
The OBBBA, enacted to provide targeted relief, created a series of deductions that are scheduled to sunset after the 2028 tax year. These provisions were designed with specific thresholds and eligibility requirements, creating a complex patchwork of rules that taxpayers, employers, and the Internal Revenue Service (IRS) must navigate.
1. The Overtime Pay Deduction (Option 34)
Currently, taxpayers can deduct up to $12,500 ($25,000 for joint filers) of qualified overtime pay. This deduction applies strictly to the "half" portion of time-and-a-half pay required by the Fair Labor Standards Act (FLSA). The policy aims to reward those working additional hours, but it introduces significant administrative friction. If made permanent, this measure would cost the federal treasury an estimated $372.4 billion over a decade.
2. The Auto Loan Interest Deduction (Option 36)
This provision allows for a $10,000 deduction on interest paid for new, U.S.-assembled vehicles. With a phaseout starting at $100,000 for single filers and $200,000 for joint filers, the policy is aimed at the middle class. However, the fiscal cost is estimated at $33.7 billion, and analysts point to the "uneven" nature of the policy, which favors certain consumer debts over others, such as credit card interest, which remains non-deductible.
3. The Enhanced Senior Deduction (Option 33)
Targeting those 65 and older, this provision provides an additional $6,000 deduction. While intended to assist seniors on fixed incomes, the policy faces criticism for its interaction with Social Security. By reducing taxable income, the deduction also reduces the taxes remitted to the Social Security trust fund, potentially accelerating the program’s long-term funding challenges. The projected cost is $137.9 billion over ten years.
4. The Deduction for Tip Income (Option 35)
Designed to assist service-sector employees, this policy allows a deduction of up to $25,000 in tips. The Tax Foundation notes that this provision suffers from "targeting issues," as many low-income workers already have zero tax liability due to the standard deduction, rendering the benefit less effective for those it ostensibly aims to help.
Chronology of the "No Tax On" Movement
The emergence of these provisions marked a pivot in tax policy rhetoric, shifting from broad-based tax reform to the "carveout" model.
- 2025–2028 (Implementation Phase): The OBBBA provisions take effect. During this period, the IRS and the Department of Labor struggle to issue clear guidance, leading to widespread confusion among workers and businesses regarding which income types and interest payments qualify for deductions.
- 2026 (The Compliance Crunch): Reports emerge from the financial and accounting sectors noting that the reporting obligations for auto loan interest are overly burdensome for lenders. Simultaneously, tax practitioners report a flood of ineligible claims as workers attempt to categorize various forms of income as "tips" or "overtime."
- 2027–2028 (The Policy Debate): As the sunset date nears, political pressure mounts to make the provisions permanent. President Trump and key members of both parties continue to champion these measures as essential support for the middle class, setting the stage for the current legislative standoff.
- 2029 and Beyond (The Fiscal Cliff): If these provisions are not extended, taxpayers will face a sudden tax increase. Conversely, if made permanent, the federal government faces a combined revenue loss of over half a trillion dollars.
Supporting Data: Economic and Fiscal Impacts
The Tax Foundation’s modeling highlights a critical disconnect between the political popularity of these deductions and their economic efficiency.
| Provision | 10-Year Deficit Impact | Economic Growth (Long-Run) |
|---|---|---|
| Overtime Deduction | $372.4 Billion | +0.1% |
| Auto Loan Interest | $33.7 Billion | < 0.05% (Decrease) |
| Enhanced Senior Deduction | $137.9 Billion | < 0.05% |
| Tip Income Deduction | $45.9 Billion | < 0.05% |
The data indicates that while the overtime deduction offers a marginal boost to the economy by lowering tax rates for some, the other provisions provide negligible growth. In the case of the auto loan interest deduction, the phaseout mechanisms—which effectively raise marginal tax rates for those in the middle of the income spectrum—actually result in a net decrease in long-term economic size.
Official Responses and Political Implications
The political consensus behind these "no tax on" provisions is broad but arguably fragile. Supporters argue that these deductions provide immediate relief to working-class Americans struggling with inflation and the rising cost of living. By exempting specific income streams or interest costs, policymakers feel they are providing tangible, recognizable benefits to their constituents.
However, the professional tax community, including the Tax Foundation, warns of the "neutrality" problem. A neutral tax code should treat similar taxpayers similarly. Under the current OBBBA rules, two workers earning identical total compensation can face vastly different tax burdens simply based on the form of their pay—for example, whether that pay comes in the form of base salary or overtime/tips. This creates an incentive for "tax planning" and income misclassification, which distorts labor markets and increases the administrative burden on the IRS.
Furthermore, economists point to the "phaseout trap." As these deductions are phased out for higher earners, the marginal tax rates for those individuals increase, creating "cliffs" where earning an extra dollar results in a disproportionate increase in tax liability.
Implications for Future Tax Reform
The implications of extending these temporary carveouts are profound. By moving further away from a broad-based, low-rate tax system toward a system of narrow, targeted deductions, Congress risks permanently complicating the tax code.
The Cost of Complexity
Every new deduction requires definitions, guardrails, and compliance oversight. The current confusion surrounding which vehicles qualify for the auto loan deduction or which occupations qualify for the tip deduction illustrates the high cost of this complexity. Businesses are forced to spend resources on tax compliance rather than innovation or expansion, while taxpayers are left to rely on potentially inaccurate tax advice.
The "Slippery Slope" of Carveouts
The success of these four provisions has already inspired a wave of new, similar proposals. If the government continues to offer tax relief through narrow carveouts, the tax code will become increasingly fragmented. Each new exception creates a new lobby, a new compliance burden, and a new opportunity for future political negotiation, making comprehensive, pro-growth reform significantly more difficult to achieve.
A Call for Neutrality
The Tax Foundation concludes its analysis with a clear recommendation: let the temporary provisions expire after 2028. Instead of extending these "patchwork" policies, Congress should prioritize broad, structural reforms. A simplified tax code that eliminates narrow provisions while maintaining lower, more uniform rates would provide a more stable environment for both businesses and individuals.
As Congress weighs its options, the debate will likely center on the tension between the immediate political appeal of "no tax on" policies and the long-term economic necessity of a transparent, neutral, and efficient tax system. The $577 billion price tag is not merely a number—it represents a choice about the future architecture of the American economy. Whether policymakers choose the path of popular, targeted relief or the path of sustainable, pro-growth structural reform remains the defining question of the upcoming legislative session.
