Prime Inc. Sues IRS for $11 Million in Disputed Reefer Fuel Tax Credits

SPRINGFIELD, Mo. — Major refrigerated trucking carrier Prime Inc. has filed a lawsuit against the Internal Revenue Service, seeking to recover approximately $11 million in federal excise taxes it paid on diesel fuel. The suit, filed in federal court, contends the taxes were improperly collected on fuel used to power its temperature-controlled trailer units, a claim that echoes previous successful legal challenges by other large carriers and highlights a significant tax credit opportunity available to transportation companies of all sizes.

The lawsuit centers on tax years 2018 and 2019 and the application of the 24.4 cents-per-gallon federal excise tax on diesel fuel. This tax is designated to fund the Highway Trust Fund, which pays for road and bridge construction and maintenance. As such, the tax is intended to apply only to fuel consumed for “on-highway” purposes, meaning the propulsion of vehicles on public roads. Prime argues that the diesel used in its refrigerated units, commonly known as reefers, constitutes an “off-highway” business use and should therefore be exempt from the tax.

Reefer units are self-contained systems with their own small diesel engines and fuel tanks, separate from the truck’s main engine. Their sole function is to power the refrigeration equipment that maintains a consistent temperature inside the trailer, protecting perishable goods like food and pharmaceuticals. Because this fuel is not used to move the truck itself, it falls under the IRS definition of off-highway use, making the excise tax paid on it eligible for a refund or a credit against income tax liability.

For large carriers like Prime, which operates thousands of refrigerated trailers, the accumulated tax amounts to a substantial sum. The company’s legal filing asserts that it can accurately track the fuel consumed by these units through onboard hour meters, which record the engine's run time. By multiplying the hours of operation by the engine manufacturer's specified fuel consumption rate, carriers can calculate the volume of off-highway fuel used and the corresponding tax paid.

This legal action is not the first of its kind. The path for such claims was largely cleared by previous court victories for other transportation firms. In a landmark 2019 case, refrigerated carrier C.R. England successfully sued the IRS and won a refund of $2.2 million. Stevens Transport, another major player in the refrigerated sector, also prevailed in a similar legal battle. These precedents have established that fuel used in trailer refrigeration units qualifies for the tax credit, provided the consumption can be adequately documented.

The IRS has historically challenged these claims, often arguing that it is difficult for companies to precisely substantiate the amount of fuel used for off-highway versus on-highway purposes, particularly in older systems where a reefer unit might draw fuel from the same tanks as the truck’s main engine. However, the industry’s increasing use of separate fuel tanks for reefers and sophisticated tracking technology like hour meters has strengthened the carriers' position in court, making it easier to provide the detailed documentation the IRS requires.

While Prime’s $11 million lawsuit captures headlines, the underlying tax principle is equally relevant to small and mid-sized carriers and even individual owner-operators running refrigerated loads. Any business that pays the federal excise tax on fuel used for off-highway purposes can claim a refund. The process involves filing IRS Form 4136, “Credit for Federal Tax Paid on Fuels,” with the company's annual income tax return. The potential savings can be significant. A single reefer unit running for 3,000 hours in a year might consume around 3,000 gallons of diesel, translating into more than $730 in tax credits for that one trailer alone.

For a small fleet, these credits can add up to thousands of dollars in annual savings, directly improving cash flow and profitability in an industry with notoriously thin margins. However, awareness of this specific provision remains surprisingly low among smaller operators, many of whom may be leaving money on the table simply because they are unaware of the credit or unsure how to navigate the documentation and filing process.

In our experience, the complexity of the U.S. tax code means that valuable credits and deductions are frequently overlooked, especially by small and mid-sized business owners focused on daily operations. This lawsuit from a major industry player like Prime is a powerful reminder that diligent tax strategy is not just about compliance, but about actively recovering overpaid funds. For companies in capital-intensive sectors like transportation, every dollar recovered through legitimate means like the off-highway fuel credit is a dollar that can be reinvested into the business. We see many business owners who are entitled to these refunds but lack the specific knowledge or resources to claim them. Proper tax preparation and compliance is an active, not a passive, process. The team at C&S Finance Group LLC helps clients identify and secure these types of specialized credits, ensuring they are not overpaying the government. Business owners can learn more at csfinancegroup.com.

The outcome of Prime's lawsuit will be closely monitored throughout the trucking industry. While legal precedent appears to be firmly on the company's side, another high-profile court loss for the IRS on this issue could pressure the agency to streamline the claims process or issue clearer guidance for all carriers. For now, the case serves as a crucial reminder for all refrigerated carriers to review their fuel tax payments and ensure they are claiming the credits they are rightfully owed.