Federal Court Upholds $10,000 SALT Deduction Cap, Rejecting New Jersey Challenge

A federal court in New Jersey has upheld the constitutionality of the $10,000 cap on the federal deduction for state and local taxes (SALT), dealing another blow to high-tax states seeking to overturn the controversial provision of the 2017 Tax Cuts and Jobs Act (TCJA).

The ruling, issued by the U.S. District Court for the District of New Jersey, dismissed a lawsuit brought by the state of New Jersey. The state had argued that the cap unconstitutionally infringes on its sovereign authority to set its own tax policy and unfairly targets its residents. This decision aligns with previous rulings from other federal courts that have consistently rejected similar legal challenges, reinforcing the legal standing of the cap as its 2025 expiration date approaches.

For business owners in high-tax states, this ruling solidifies a challenging tax reality that has existed since 2018. The cap directly impacts the bottom line for owners of pass-through entities like S-corporations and partnerships, whose business income is taxed on their personal returns. By limiting the deductibility of their state and local taxes, the cap effectively increases their federal taxable income and overall tax liability, constraining cash flow that could otherwise be used for reinvestment, expansion, or hiring. While legislative efforts to repeal or modify the cap are perpetually debated in Washington, their success remains highly uncertain.

In our experience, waiting for a political solution is not a viable business strategy. The focus must be on proactive planning with the tax code as it exists today. This is precisely where strategic tax preparation and compliance becomes critical for mitigating the cap's impact. Business owners can explore state-level workarounds, such as Pass-Through Entity Taxes (PTET), optimize their entity structure, and manage the timing of income and deductions to navigate these complex rules. To understand how this ruling and the broader SALT landscape affect your specific business, contact C&S Finance Group LLC at csfinancegroup.com for a comprehensive review.

The core of New Jersey’s argument in the case, New Jersey v. Yellen, was that the SALT cap coerces states into lowering their own taxes, thereby interfering with their sovereign power under the Tenth Amendment. The state contended that the deduction, which had been unlimited for over a century before the TCJA, was a fundamental feature of the federal-state fiscal relationship. By capping it, New Jersey argued, the federal government was effectively penalizing states that choose to provide more robust public services funded by higher taxes.

The court, however, was not persuaded. In its decision, the judge reasoned that Congress has broad constitutional authority to lay and collect taxes and that the SALT cap falls within this power. The court found that the cap does not directly command or coerce states to act in any particular way. Instead, it influences decisions through financial incentives, a practice that federal courts have repeatedly found to be permissible. The ruling noted that states remain free to maintain their own tax systems, even if the federal tax consequences are less favorable for their residents than they were previously.

This outcome is the latest in a string of legal defeats for states challenging the SALT cap. In 2019, a similar lawsuit filed by New York, Connecticut, Maryland, and New Jersey was dismissed by the Southern District of New York. That decision was later upheld in 2021 by the U.S. Court of Appeals for the Second Circuit, which found that the states had failed to show that the cap was unconstitutionally coercive. These consistent judicial precedents have created a high legal barrier for any future challenges.

The financial implications for small and mid-sized businesses, particularly in states like New Jersey, New York, California, and Illinois, are significant. Owners of pass-through businesses pay state income tax on their share of the company's profits. Before the TCJA, this entire amount could be deducted on their federal return. With the $10,000 cap, an owner with a $100,000 state income tax bill can only deduct $10,000, leaving $90,000 of that expense non-deductible for federal purposes and subject to federal income tax.

In response to the cap, more than 30 states have enacted a popular workaround known as a Pass-Through Entity Tax (PTET). These state-level laws allow partnerships and S-corporations to elect to pay state income tax at the entity level, rather than at the individual owner level. The tax paid by the entity is then treated as a deductible business expense on the federal return, which is not subject to the individual $10,000 SALT cap. While this has provided crucial relief for many business owners, it has also introduced a new layer of complexity and variability to state tax compliance.

With the judicial pathway to overturning the cap appearing closed, all eyes are now on Congress. The entire individual tax framework of the TCJA, including the $10,000 SALT cap, is set to expire automatically at the end of 2025. This sets the stage for a major legislative battle over the future of federal tax policy. Democrats from high-tax states have made a full repeal of the cap a top priority, while many Republicans advocate for making the cap permanent, arguing it prevents high-tax states from exporting their tax burden to the rest of the country.

Looking ahead, New Jersey has the option to appeal the district court’s decision to the U.S. Court of Appeals for the Third Circuit. However, given the consistent rulings in other circuits, the primary battleground over the SALT deduction will likely be legislative. The outcome of the upcoming elections will heavily influence the negotiations in 2025, leaving business owners to navigate the current uncertainty with careful, strategic tax planning.