As the United States faces annual federal budget deficits approaching the staggering $2 trillion mark, the pressure on Capitol Hill to address long-term fiscal sustainability has reached a fever pitch. With both political parties under increasing scrutiny regarding the national debt, lawmakers are looking toward the U.S. tax code—not merely as a mechanism for revenue collection, but as a critical lever for economic policy.
The Tax Foundation’s latest comprehensive resource, Options for Reforming America’s Tax Code 3.0: A Policymaker’s Guide to Tax Reform Trade-Offs, arrives at a pivotal moment. The report offers a granular analysis of 86 distinct modifications to the federal tax system, specifically highlighting 52 options capable of reducing federal deficits on a dynamic basis over the next decade. However, the report cautions that the method of revenue collection is just as vital as the amount collected.
The Core Mandate: Efficiency vs. Revenue
In the landscape of modern fiscal policy, not all tax increases are created equal. Two different proposals might yield identical results on a conventional, static scoring basis, yet one may inadvertently stifle economic growth, increase administrative complexity, or erode neutrality. The fundamental challenge for 119th and 120th Congresses is to identify revenue-raising measures that adhere to the principles of sound tax policy: simplicity, transparency, neutrality, and stability.
Broadening the tax base—rather than merely increasing marginal rates—emerges as a recurring theme in the Tax Foundation’s analysis. By eliminating preferential treatments and narrowing exclusions, policymakers can achieve fiscal goals while minimizing the distortionary effects that often follow rate hikes.
1. The Fringe Benefit Paradox: Reevaluating Compensation
The tax code currently treats various forms of compensation differently, a practice that compromises the neutrality of the federal system. Employer-provided benefits—ranging from health insurance and retirement contributions to more niche perks like on-site gym access, student loan repayment assistance, and employee discounts—are frequently excluded from federal income tax.
The Mechanism of Inequality
Consider two employees earning $50,000 in total compensation. Worker A receives the full amount in cash wages, while Worker B receives $2,000 in tax-free fringe benefits. Under the current structure, Worker B pays less in federal income tax, despite enjoying the same level of economic resources as Worker A. This discrepancy creates an inefficient distortion in the labor market.
The Proposed Reform (Option 32)
The Tax Foundation proposes eliminating the income tax exclusion for these fringe benefits. By including the value of these perks in an employee’s taxable income, the government would significantly broaden the tax base. The projected result is a reduction in the primary deficit by approximately $396.8 billion between 2027 and 2036.
When compared to an alternative approach—such as raising the top marginal individual income tax rate to 50 percent—the benefits of base-broadening become clear. Increasing marginal rates acts as a direct deterrent to work and investment, whereas eliminating exclusions promotes a more transparent and neutral tax environment.
2. Housing and Markets: Scrutinizing Targeted Credits
For decades, the Low-Income Housing Tax Credit (LIHTC) and the New Markets Tax Credit (NMTC) have been cornerstones of bipartisan efforts to spur economic development. However, their efficacy is increasingly under the microscope.
Economic Inefficiency
Policy analysts have long criticized these credits for their inherent complexity and, in the case of LIHTC, the high cost per unit of housing created. Critics argue that the current structure is an inefficient mechanism for delivering actual affordable housing to vulnerable populations.
The Reform Path (Option 76)
Repealing these credits would broaden the business tax base, generating a dynamic reduction in the primary deficit of $202.7 billion over the coming decade. The alternative—capping the business State and Local Tax (SALT) deduction—would also broaden the base but would likely trigger a sharper decline in GDP and a significant loss in total employment. Thus, the repeal of targeted, inefficient credits presents a more sustainable fiscal path than blunt-force deductions.
3. The Municipal Bond Exclusion: Addressing Neutrality
Since the inception of the permanent income tax in 1913, interest earned on municipal (muni) bonds has been excluded from federal income tax. While this has been a popular tool for local governments to fund infrastructure, it represents a departure from the principle of a neutral tax system.
Distorting Investment
By favoring one type of savings vehicle over others, the muni bond exclusion allows local governments to secure lower interest rates than corporate or federal issuers, despite identical risk-adjusted returns. This distortion shifts capital toward projects that might not be the most economically productive.
The Impact of Repeal (Option 29)
Eliminating the muni bond income tax exclusion would generate $155.2 billion in deficit reduction through 2036. While some argue that this would harm local government financing, the alternative of eliminating the broader SALT deduction would be far more damaging to the national economy, as it would directly spike marginal tax rates on labor and business income across the board.
4. Itemized Deductions and the 2025 Legislative Legacy
The One Big Beautiful Bill Act of 2025 introduced a new cap on itemized deductions, limiting their value to 35 percent for high-income earners in the top tax bracket.
Tightening the Cap (Option 24)
The proposal suggests tightening this limit further to 28 percent. This move would broaden the tax base by reducing the preferential value of itemization, potentially encouraging more taxpayers to opt for the simplicity of the standard deduction. This shift is estimated to reduce the primary deficit by $139 billion over a decade. Crucially, this approach is less economically punitive than taxing capital gains and dividends at ordinary income rates, which would discourage investment and capital formation.
5. Modernizing Infrastructure Funding: The VMT Tax
The Highway Trust Fund (HTF), established in 1956, is currently facing a long-term solvency crisis. Its primary funding source—the federal gas tax—has not been adjusted for inflation since 1993. Furthermore, the rise of electric and hybrid vehicles means that a growing segment of the population uses the nation’s roads while contributing little to nothing toward their maintenance.
The Transition to VMT
A Vehicle Miles Traveled (VMT) tax, adjusted by vehicle weight, offers a modern solution. Under this proposal, passenger vehicles would be taxed at roughly 0.9 cents per mile, while heavy freight vehicles would pay 10.6 cents per mile.
Long-Term Sustainability
This transition would reduce the primary deficit by $133.7 billion over ten years. While an increase in the federal gas tax would raise more immediate revenue, it would result in greater job losses and would not address the fundamental issue of the shrinking gas-tax base as the automotive market shifts toward electrification.
Chronology of Fiscal Challenges
The path to this moment has been paved by decades of deficit spending and incremental tax policy adjustments:
- 1913: The introduction of the federal income tax and the initial exclusion for municipal bond interest.
- 1956: The creation of the Highway Trust Fund, linking fuel consumption to infrastructure funding.
- 1993: The last major inflation adjustment to the federal gasoline tax.
- 2017: The Tax Cuts and Jobs Act (TCJA), which altered the landscape of itemized deductions and SALT.
- 2025: The implementation of new caps on itemized deductions, signaling a shift toward base-broadening.
- 2026 and beyond: The current era, characterized by annual deficits approaching $2 trillion and the urgent need for structural reform.
Implications for Policymakers
The Policymaker’s Guide to Tax Reform Trade-Offs serves as a stark reminder that the "easy" path—simply raising rates—often carries the highest long-term economic cost. As Congress prepares for future legislative sessions, the following principles should remain at the forefront:
- Simplicity: Tax codes should be easy to navigate, reducing the compliance burden on both businesses and individuals.
- Neutrality: The tax code should not influence economic decision-making by favoring one type of investment or compensation over another.
- Transparency: Revenue-raising measures should be clear, predictable, and devoid of hidden incentives.
- Stability: Long-term fiscal health depends on policies that do not require constant, disruptive adjustments.
The fiscal trajectory of the United States is currently unsustainable. However, by prioritizing base-broadening over rate increases and targeting inefficient tax expenditures, policymakers can stabilize the budget without sacrificing the economic dynamism that drives American prosperity. The challenge lies in the political will to enact these reforms—a challenge that will define the legislative legacy of the next decade.
Official Responses and Outlook
While reactions from various caucuses remain divided, there is growing bipartisan consensus that the current structure of the Highway Trust Fund and the complexity of business tax credits are unsustainable. Treasury officials and members of the Congressional Budget Office (CBO) have repeatedly warned that absent reform, the interest on the national debt will continue to crowd out critical government services. The Tax Foundation’s guide provides the technical roadmap; it remains to be seen whether the political courage will follow.
