This study provides an exhaustive analysis of the United States federal and Wisconsin state research and development tax credit frameworks as applied to the industrial ecosystem of Oshkosh, Wisconsin. By examining specific regional industries through the lens of recent legislative changes and case law, this document establishes a definitive guide to tax credit eligibility and compliance.

The Statutory and Regulatory Framework of R&D Tax Credits

The landscape of research and development (R&D) tax incentives is governed by a highly intricate interplay of federal statutes, state laws, and evolving judicial precedents. To understand how the diverse commercial enterprises in Oshkosh, Wisconsin, can successfully leverage these incentives, it is imperative to first deconstruct the underlying legal requirements, recent legislative overhauls, and the specific compliance mechanisms mandated at both the federal and state levels.

United States Federal R&D Tax Credit (IRC § 41, § 174, and § 174A)

The federal R&D tax credit, codified under Internal Revenue Code (IRC) Section 41, is a central pillar of United States economic policy designed to incentivize domestic businesses to incur research and experimental (R&E) expenditures. To qualify for the credit, a taxpayer’s activities must strictly adhere to a four-part statutory test established by the Internal Revenue Service (IRS) and refined through decades of tax court litigation. Every element of this test must be satisfied simultaneously for an activity to generate qualified research expenses (QREs).

The federal landscape for R&E expenditures has undergone extreme volatility due to recent legislative shifts. Under the Tax Cuts and Jobs Act (TCJA), taxpayers were stripped of their ability to immediately deduct domestic R&E expenditures. For tax years beginning after December 31, 2021, the TCJA mandated that all such expenditures be capitalized and amortized over five years for domestic research and fifteen years for foreign research. This capitalization requirement severely impacted the cash flow of research-intensive manufacturing firms.

However, the enactment of the One Big Beautiful Bill Act (OBBBA) on July 4, 2025, fundamentally reversed this paradigm, creating a highly favorable environment for domestic innovation. The OBBBA introduced IRC Section 174A, which permanently restored the ability for businesses to immediately deduct domestic R&E expenditures in the tax year they are incurred, effective for tax years beginning in 2025. The legislative intent was to create a sharp distinction between domestic and foreign R&D to incentivize onshore research; thus, foreign R&E expenditures must still be capitalized and amortized ratably over a 15-year period under the existing Section 174.

The OBBBA also provided critical, yet complex, transition rules for unamortized domestic R&E costs that accumulated during the 2022–2024 TCJA capitalization period. Taxpayers possess several strategic options to recover these costs. They may elect to deduct the full remaining balance in the 2025 tax year, or they may spread the deduction evenly across a two-year period spanning 2025 and 2026 to manage taxable income and prevent the triggering of tax shelter classifications under Section 448(c). Alternatively, taxpayers classified as an “eligible small business”—defined as having average annual gross receipts under $31 million over the prior three tax years—may elect to apply Section 174A retroactively. This retroactive election allows small businesses to amend their 2022–2024 taxable returns to deduct domestic R&E costs immediately rather than amortizing them, provided the amended returns are filed no later than July 6, 2026.

Furthermore, taxpayers must carefully coordinate the immediate deduction under Section 174A with the generation of the Section 41 R&D tax credit. Under the coordination rules of Section 280C(c), the deduction taken under Section 174A must generally be reduced by the amount of the R&D credit claimed under Section 41. Taxpayers may circumvent this by electing to take a reduced credit, requiring complex financial modeling to optimize overall corporate cash flow.

Wisconsin State Research Expense Credit (Wis. Stat. § 71.28(4))

The State of Wisconsin offers a robust Research Expense Credit that complements the federal incentive but operates under highly distinct statutory rules and apportionment mechanics. Wisconsin statutes define eligible expenses by directly referencing the federal definition of “qualified research” found in IRC Section 41. However, Wisconsin operates on a fixed conformity date. The state specifically utilizes the federal Internal Revenue Code in effect on December 31, 2021. Consequently, Wisconsin has not adopted the post-2021 federal capitalization changes of the TCJA, nor the recent OBBBA Section 174A immediate expensing mechanisms for state tax computation purposes, meaning pre-2022 federal provisions generally apply for calculating the Wisconsin benefit.

Crucially, the Wisconsin credit is geographically restricted. It applies exclusively to qualified research expenses incurred for research physically conducted within the state of Wisconsin. This includes expenses for wages paid to employees engaging in research, supplies consumed in the research process, and a percentage of contract research paid to third parties located within the state. Wisconsin does not follow federal provisions regarding the aggregation of expenditures for controlled groups or collaborative energy research consortia, requiring entities to compute their eligible in-state expenditures independently.

The state provides a tiered credit structure designed to reward companies that consistently increase their research investments, with specific bonuses for research related to energy efficiency and internal combustion engines:

A major evolution in the Wisconsin credit framework is its transition from a strictly non-refundable credit to one with increasing refundability, providing immediate cash liquidity even for manufacturers in a net operating loss position. For taxable years beginning after December 31, 2017, the credit was 10% refundable; this increased to 15% for years beginning after December 31, 2020. For taxable years beginning on or after January 1, 2024, up to 25% of the research credit is refundable. The refundable portion is calculated using Wisconsin Schedule R, taking the lesser of the current year credit remaining after offsetting tax, or the applicable 25% of the total current year credit. Any unused research credit that is not refundable may be carried forward for up to 15 years, requiring meticulous tracking on Schedule CF.

The Geographic and Historical Industrialization of Oshkosh

To thoroughly analyze the application of R&D tax credits to specific business components in Oshkosh, one must examine the profound geographic and historical forces that shaped its industrial base. The city is located on the western shore of Lake Winnebago, midway between the Fox Cities and Fond du Lac, at the precise point where the waters of the Fox River empty into the lake. Long inhabited by the Ho-Chunk and Menominee Indians, the site saw its first permanent white settlement in 1836 when Webster Stanley established a trading post and tavern. By 1840, the merging villages of Brooklyn and Athens adopted the name Oshkosh in honor of the local Menominee chief.

The region’s topography dictated its initial economic destiny. As the Fox River flows north over the course of 35 miles, it falls 170 feet—a drop roughly equivalent to the height of Niagara Falls. This immense hydraulic potential attracted heavy industry. Simultaneously, the Wolf River, a massive waterway that mingles with the Fox River just above Lake Winnebago, provided a deep and broad channel stretching directly into the dense pine forests of northern Wisconsin. Oshkosh became the natural chokepoint and processing hub for the midwestern timber trade.

In 1847, Morris Firman built the city’s first sawmill, and the industry exploded shortly thereafter. The Great Chicago Fire of 1871 proved to be a massive economic catalyst, as Oshkosh mills supplied the vast majority of the lumber required to rebuild the metropolis. By 1873, Oshkosh boasted 24 sawmills, 15 shingle mills, and seven sash and door factories, earning the city the famous moniker “Sawdust City”. This concentration of labor was not without friction; in 1898, 1,500 Oshkosh woodworkers launched a massive 14-week strike demanding better wages, an event characterized by intense civil unrest and the participation of female laborers clashing with deputies.

As the natural supply of easily accessible timber shifted and dwindled by the late 19th and early 20th centuries, the industrial base of Oshkosh and the broader Fox Valley demonstrated remarkable adaptability. The region transitioned away from raw lumber milling toward advanced paper manufacturing, textiles (such as the founding of OshKosh B’Gosh in 1895), and the fabrication of complex mechanical machinery. Today, the Oshkosh-Neenah Metropolitan Statistical Area boasts a massive concentration of heavy manufacturing and engineering. The sector remains the area’s top industry, employing over 22,000 people across more than 300 manufacturing-related businesses. The local workforce exhibits a high concentration of engineering, production, and mechanical trades, creating a rich ecosystem for technological development.

The following case studies detail five unique industries that developed out of this historical context, meticulously analyzing how their specific R&D activities meet the strict parameters of United States federal and Wisconsin state tax laws, supported by relevant judicial precedents.

Case Study: Specialty Vehicles, Tactical Defense, and Heavy Electrification

Historical Development in Oshkosh

The genesis of heavy vehicle manufacturing in Oshkosh represents a direct evolution from the city’s early mechanical prowess in milling and logging equipment. In 1915, inventors William Besserdich and Bernhard Mosling patented a revolutionary four-wheel-drive system designed to navigate treacherous, unpaved terrain. Unable to sell their patent to established automakers, they founded the Wisconsin Duplex Auto Company in 1917, which was swiftly reorganized and renamed to reflect its geographic roots, eventually becoming the globally recognized Oshkosh Corporation.

The city’s existing workforce, accustomed to fabricating heavy iron for sawmills, provided the perfect labor pool for severe-duty automotive manufacturing. Oshkosh Corporation rapidly expanded by securing critical military contracts. Between 1943 and 1945, the company delivered 988 powerful W-Series snowplow trucks to the U.S. military, ensuring that airfields and bases in harsh winter climates remained operational. This established a century-long legacy of designing mission-critical defense and municipal vehicles, eventually leading to the acquisition of numerous specialty brands including Pierce Manufacturing, JLG Industries, and McNeilus.

Modern R&D Activities

Today, specialty vehicle manufacturing in Oshkosh involves extreme technological complexity, far removed from standard automotive assembly. Oshkosh Corporation conducts extensive R&D in electric and hybrid mobility, autonomous systems, and advanced suspension dynamics. For example, the development of the McNeilus Volterra ZSL—a fully integrated, zero-emission electric refuse collection vehicle—requires significant engineering to manage lithium-ion battery thermal loads and integrate revolutionary electric-axle systems capable of handling severe municipal stop-and-go duty cycles without losing mechanical power. Similarly, the Pierce Volterra electric fire truck requires a patented parallel-electric drivetrain that allows for zero-emission driving operation while ensuring an internal combustion engine can seamlessly and instantly engage to provide continuous high-pressure water pumping during emergency response.

Further R&D involves advanced mobility for tactical defense. Oshkosh engineers developed the TAK-4i Intelligent Independent Suspension system during the design of the Joint Light Tactical Vehicle (JLTV). This required moving away from traditional solid axle springs to experimental high-pressure gas struts, an innovation that allows for up to 70% faster off-road travel over hostile terrain while protecting the crew from concussive forces. Additionally, the company is heavily invested in autonomous “Leader-Follower” capabilities. This requires deploying AI-powered perception systems utilizing LiDAR, RADAR, and complex machine learning algorithms to allow unmanned military convoys to navigate battlefields, negotiate complex terrain, and autonomously avoid obstacles.

Tax Credit Eligibility and Legal Precedents

These activities fundamentally align with the four-part test of IRC Section 41. The development of parallel-hybrid drivetrains and AI perception systems seeks to eliminate severe technical uncertainty regarding heavy vehicle performance under extreme stress (satisfying the Section 174 test), relies heavily on electrical engineering and computer science (satisfying the Technological in Nature test), and involves iterative physical prototyping, computational modeling, and field testing (satisfying the Process of Experimentation test). Because much of this research touches upon the optimization of internal combustion engines and energy efficiency (such as the JLG DaVinci all-electric scissor lift that recovers energy during descent), these expenses are highly likely to qualify for Wisconsin’s elevated 11.5% research credit tier under Wis. Stat. § 71.28(4)(ad)5-6.

However, defense and municipal manufacturing carries a massive and frequently litigated tax compliance risk: the “funded research” exclusion. Under IRC § 41(d)(4)(H), research funded by any contract, grant, or governmental entity does not constitute qualified research. To overcome this exclusion, the taxpayer must prove two elements: they must bear the financial risk of failure, and they must retain substantial rights to the research results.

The application of this rule requires exhaustive scrutiny of the underlying development contracts. In Dynetics Inc. and Subsidiaries v. United States, the U.S. Court of Federal Claims denied R&D credits for a defense contractor after reviewing over 100 contracts, determining that the payment terms guaranteed reimbursement regardless of technical success, rendering the research “funded”. Conversely, in the landmark case Fairchild Industries Inc. v. United States, the court allowed the credit for the development of a military trainer aircraft. The court ruled that because Fairchild’s fixed-price incentive contract with the Air Force made payment contingent on the ultimate success of the rigorous, 1,000-page technical specifications, the taxpayer bore the financial risk.

Therefore, manufacturers in Oshkosh developing platforms like the Next Generation Delivery Vehicle (NGDV) for the USPS or the JLTV for the Department of Defense must meticulously structure their contracts. Contracts must be drafted to ensure payment is strictly tied to technical success and performance milestones rather than guaranteed time-and-materials reimbursement. Only by bearing this financial risk can these firms secure federal and Wisconsin R&D credit eligibility.

Case Study: Aviation, Aerospace, and Experimental Aircraft Design

Historical Development in Oshkosh

Aviation is inextricably woven into the cultural and economic identity of Oshkosh, driven primarily by the legacy of aviator and designer Sylvester J. (Steve) Wittman, and the subsequent relocation of the Experimental Aircraft Association (EAA) to the city. Wittman, who remarkably earned his pilot certificate signed by Wilbur Wright despite initial medical rejections for defective vision, managed the Oshkosh airport from 1931 to 1969. He was an unmatched pioneer in aircraft design, famously building highly successful closed-course racers like “Chief Oshkosh,” “Bonzo,” and the “Buster”.

In 1937, operating out of his Oshkosh hangar, Wittman designed the “Buttercup,” a two-place aircraft featuring patented leading-edge flaps that allowed for incredibly slow flight while maintaining stability. He also invented and patented a revolutionary single-piece flat steel landing gear that absorbed extreme shock; this design was subsequently utilized on nearly all Cessna aircraft and remains an industry standard today. The Buttercup design was so advanced that when Wittman chance-landed at the Fairchild Aircraft factory in Maryland, their engineers noted it outperformed all their production models, leading to discussions of mass commercial production that were only halted by the onset of World War II. Later, he developed the Wittman Tailwind, maximizing speed by mating an 85-horsepower Continental engine to uniquely short Hershey-bar wings.

Simultaneously, the homebuilt aircraft movement was gaining traction. Founded in a Milwaukee basement in 1953 by Paul Poberezny, the EAA held its first fly-in at Wright-Curtiss Field. As the event grew exponentially, it moved to Rockford, Illinois, but quickly outgrew that facility as well. Recognizing the need for a massive venue, Steve Wittman suggested the Oshkosh airport. Its vast surrounding acreage and non-intersecting east/west and north/south runways allowed for unprecedented traffic movement. The EAA relocated its fly-in to Oshkosh in 1970, permanently transforming the city into the global epicenter of experimental aviation, drawing nearly 700,000 attendees and making the Wittman Regional Airport control tower the busiest in the world for one week every July.

Modern R&D Activities

The aerospace sector in Oshkosh today encompasses both the grassroots experimental prototyping championed by EAA builders and advanced defense aerospace engineering. Companies engaged in this sector conduct rigorous R&D to optimize airframe structures, reduce drag, and improve fuel efficiency. This requires utilizing computational fluid dynamics (CFD) simulations to balance lift, weight, and aerodynamics while meeting stringent FAA certification standards.

Furthermore, modern R&D extends to the development of hybrid or fully electric propulsion units for aircraft and unmanned aerial vehicles (UAVs). This involves building and testing thrust vector control mechanisms and engineering solutions to solve severe thermal management challenges encountered in high-altitude, low-oxygen environments. The legacy of Steve Wittman’s landing gear and structural innovations continues as modern aerospace firms in the region experiment with advanced composite materials—such as carbon fiber, Kevlar, and titanium alloys—to reduce gross weight while maintaining structural integrity under extreme G-forces.

Tax Credit Eligibility and Legal Precedents

Aerospace engineering inherently faces massive technical uncertainty, making it a prime candidate for R&D tax credits under both federal and Wisconsin law. The iterative testing of wing geometries in wind tunnels or via sophisticated CFD software clearly satisfies the “Process of Experimentation” requirement by systematically evaluating alternatives to achieve a specific performance metric, guided by the principles of physics and fluid dynamics.

A critical legal precedent for the aviation industry is the treatment of production expenses incurred in developing experimental “pilot models.” Building an experimental aircraft is incredibly capital-intensive. In the recent Tax Court case Intermountain Electronics, Inc., the IRS attempted to challenge the definition of a process of experimentation and the validity of expenses tied to physical prototypes. The court evaluated the treatment of production costs incurred to develop a pilot model, affirming that expenses related to designing, building, and destructively testing a prototype before it is ready for commercial production fundamentally qualify for the credit under IRC § 174. Therefore, Oshkosh aviation firms can capture the massive material and labor costs associated with building full-scale experimental testbeds.

Furthermore, because Wisconsin calculates its credit based solely on QREs physically incurred within the state, the high concentration of aerospace testing facilities, wind tunnels, and experimental hangars situated directly at Wittman Regional Airport provides a distinct geographic advantage for capturing the state credit.

Case Study: Advanced Paper Converting and Sustainable Packaging

Historical Development in Oshkosh

The Fox River Valley, encompassing Oshkosh, Neenah, Menasha, and Appleton, is historically revered as the “Paper Valley”. The industry’s origins lie in the 1850s, when entrepreneurs realized that the Fox River’s massive 170-foot drop provided the ideal hydropower required to process the region’s vast northern timber reserves into pulp. The area’s first paper mill opened in Appleton in 1853, and the Neenah Paper Mill, opened in 1865, quickly became highly profitable. While early mills produced basic newsprint from rags, straw, and waste paper, the dramatic shift to wood pulp technology in the 1870s catalyzed a manufacturing boom that made Wisconsin the nation’s leader in paper production.

The region’s manufacturers continually evolved to survive shifting economic demands, transitioning from basic printing paper to complex converted products. A prime example of this evolution is the trajectory of the Bemis Company. Founded in 1858 in St. Louis by Judson Moss Bemis as a bag manufacturing business, Bemis eventually headquartered its massive technical operations in Neenah, directly adjacent to Oshkosh. Bemis grew into a global supplier of flexible and rigid plastic packaging, developing a deep technical base in polymer chemistry, film extrusion, and laminating. In 2019, Amcor acquired Bemis in a massive $6.8 billion all-stock merger, creating the undisputed global leader in consumer packaging. This concentration of capital and technical expertise has cemented the Oshkosh region as a permanent hub for advanced packaging engineering.

Modern R&D Activities

The modern packaging industry faces immense global pressure to develop sustainable, eco-friendly materials without compromising product protection, barrier properties, or shelf life. R&D activities in Oshkosh include discovering chemical methods to utilize post-consumer recycled (PCR) plastics in food-grade packaging, which presents severe contamination and structural challenges. Engineers are also developing entirely new biodegradable or plant-based films, and innovating multi-layer laminate structures that prevent oxygen and moisture permeation for medical and pharmaceutical applications.

Furthermore, packaging companies invest heavily in process engineering. This includes designing new manufacturing line processes to increase high-speed automation, streamline extrusion operations, and reduce greenhouse gas emissions and raw material waste during production. Engineers rely on 3D CAD modeling and rapid physical prototyping to test new packaging geometries that enhance the speed of filling operations on the assembly line, ensuring that novel eco-friendly materials do not jam high-speed commercial packaging machinery.

Tax Credit Eligibility and Legal Precedents

Developing new polymer blends, multi-layer extrusion techniques, and biodegradable adhesives unequivocally relies on the hard sciences of chemistry and mechanical engineering, thereby cleanly passing the “Technological in Nature” test. The iterative formulation of these chemical structures and the stress-testing of their barrier properties under thermal and kinetic stress constitutes a valid process of experimentation.

However, the packaging industry must be acutely aware of judicial precedents that restrict claiming credits for routine quality control or purely cosmetic changes. In Phoenix Design Group, Inc. v. Commissioner, the Tax Court denied research credits to an engineering firm entirely. The court ruled that the taxpayer failed to demonstrate that substantially all its activities involved a systematic evaluation of alternatives using the scientific method, noting that simply complying with building codes or industry standards constitutes “routine engineering” rather than qualified research under IRC § 41.

Applied to the packaging sector in Oshkosh, this means a firm cannot claim R&D credits for standard quality assurance testing of an existing box design or making simple dimensional changes to a plastic bottle. Contemporaneous documentation must exist to prove that the firm tested multiple, distinct chemical formulations or mechanical designs to overcome a specific technical failure, such as the unexpected delamination of a newly developed recyclable film under high heat. Establishing the baseline uncertainty and documenting the failed iterations is critical to defending the credit upon an IRS or Wisconsin DOR examination.

Case Study: Marine Manufacturing and Naval Logistics

Historical Development in Oshkosh

Lake Winnebago, the largest inland lake entirely within Wisconsin, has profoundly influenced the geography, culture, and economy of Oshkosh. Before the installation of commercial dams in the 1850s, the surrounding upper pool lakes were vast marshes and wild rice fields. As the waterways were engineered, the presence of this massive body of water necessitated watercraft for early pioneer transportation and later spurred a booming recreational sailing and commercial marine industry. The Neenah and Oshkosh Yacht Clubs, established in 1863 and 1869 respectively, are among the oldest in the nation, fostering a local demand for high-performance marine manufacturing and racing craft.

This rich maritime environment attracted specialized companies like the Dunphy Boat Manufacturing Co., which relocated from Eau Claire to Oshkosh in 1935. Dunphy became nationally renowned for pioneering molded plywood boats and runabouts, an early form of composite manufacturing that revolutionized hull strength, hydrodynamics, and weight reduction long before the advent of fiberglass. Furthermore, the city developed a highly specialized marine textile and sailmaking industry; for instance, the massive 2,500-square-foot sail inventory for the globe-circumnavigating 65-foot schooner Utopia was custom-engineered and cut in Oshkosh in 1956 by local sailmaker Lincoln Foster, utilizing heavy power sewing machinery to withstand oceanic gales.

Modern R&D Activities

Today, the marine manufacturing legacy in Oshkosh has evolved far beyond recreational plywood boats into highly advanced naval engineering, additive manufacturing, and defense logistics. A critical modern example is the strategic public-private partnership (PPP) established between Oshkosh Defense and the United States Marine Corps’ Marine Depot Maintenance Command (MDMC). This partnership focuses on advanced manufacturing, specifically developing the Digital Manufacturing Exchange (DMX), a secure networked digital backbone designed to facilitate the additive manufacturing (3D printing) of prototype and replacement parts for tactical vehicles and amphibious naval systems directly at the point of need.

R&D in this sector involves complex reverse-engineering of legacy marine and amphibious components, developing highly secure digital technical data packages that safeguard intellectual property from cyber threats, and testing advanced polymer and metallic 3D printing techniques. Engineers must ensure that parts additively manufactured in austere or contested forward-operating environments possess the exact metallurgical compositions required to withstand the harsh corrosive environment of saltwater operations and immense combat stress.

Tax Credit Eligibility and Legal Precedents

The utilization of advanced additive manufacturing for marine and defense applications is laden with technical uncertainty. Determining the correct laser sintering parameters, powder bed fusion temperatures, and alloy cooling rates for a new 3D-printed naval component requires a rigorous, scientifically documented process of experimentation. The massive material costs associated with building and destructively stress-testing these prototypes are fully deductible under the newly restored IRC Section 174A as domestic R&E expenditures, and the labor and supply costs qualify for the Section 41 credit.

A highly relevant legal principle for this manufacturing sector is the strict definition of a “business component.” In United States of America v. Leonard L. Grigsby, a construction company failed to secure R&D credits partly due to a catastrophic inability to properly identify the specific business components (the distinct products or processes) being improved during their interrogatories. The court emphasized that the credit is evaluated on a component-by-component basis.

For Oshkosh marine manufacturers engaging in digital additive manufacturing, it is not legally sufficient to claim R&D on “general 3D printing operations” or “overall depot maintenance.” Taxpayers must meticulously document the specific marine part being developed (e.g., a specific amphibious hull bracket or a custom cooling impeller), establish the baseline performance metrics, articulate the exact hypotheses tested to improve tensile strength or saltwater corrosion resistance, and record the specific technological discoveries made during the printing trials.

Case Study: Industrial Information Technology and Digital Manufacturing

Historical Development in Oshkosh

As traditional heavy manufacturing faced intense global competition and supply chain complexities in the 21st century, the economic base of Oshkosh recognized the existential necessity of digital integration. The region actively cultivated an Information Technology (IT) sector to support its colossal manufacturing output, supported by community initiatives like “Amplify Oshkosh” and leveraging the deep technical talent pipelines flowing from the University of Wisconsin-Oshkosh and Fox Valley Technical College. Consequently, Oshkosh has seamlessly transitioned its identity from a traditional 19th-century “Sawdust City” into a modern hub of “Digital Manufacturing,” connecting physical assembly lines with advanced data architecture.

Modern R&D Activities

Oshkosh Corporation exemplifies this IT integration through its dedicated Digital Manufacturing team, which actively partners with academic institutions like Auburn University’s Interdisciplinary Center for Advanced Manufacturing Systems (ICAMS). R&D in this sector pushes the boundaries of software engineering, focusing on developing physics-based digital simulations, artificial intelligence (AI), and machine learning algorithms specifically tailored for supply chain integration and industrial cybersecurity.

Software engineers and data scientists in Oshkosh develop highly proprietary telematics and advanced analytics models. For instance, to manage a volatile global supply chain, Oshkosh developed a predictive model utilizing machine learning algorithms that can predict part shortages with over 80% accuracy based on historical data patterns. They also developed the Economic Order Quantity (EOQ) model, a proprietary algorithm that dynamically evaluates inventory levels against production schedules to optimize global ordering. Furthermore, companies are developing Augmented Reality (AR) and Virtual Reality (VR) solutions for workforce training and job site management. The JLG Equipment Explorer App, developed internally, leverages AR technology to allow construction operators to project virtual heavy machinery onto a physical job site via smartphones, calculating spatial constraints, visualizing attachment configurations, and modeling safety metrics before physical equipment ever arrives. Another significant project involved outfitting S-Series concrete mixers with specialized telematics packages to capture real-time operational data from active construction sites, integrating seamlessly into existing fleet management architectures.

Tax Credit Eligibility and Legal Precedents

Software development introduces unique and historically combative challenges under federal and Wisconsin tax law, particularly regarding the classification of Internal Use Software (IUS). Software developed by a taxpayer primarily for internal use (e.g., Oshkosh’s proprietary predictive supply chain EOQ model) must meet the standard four-part test plus an additional, highly restrictive three-part “High Threshold of Innovation” test as outlined in the Treasury Regulations and IRS Audit Guidelines.

To legally qualify for the R&D credit, the internal-use software must demonstrably be:

1. Innovative: The software must result in a reduction in cost, improvement in speed, or other measurable improvement that is substantial and economically significant. Minor performance tweaks do not qualify.
2. Involve Significant Economic Risk: The taxpayer must commit substantial resources to the development process, and there must be substantial uncertainty—due to technical risk—that those resources will be recovered within a reasonable period.
3. Commercially Unavailable: The software cannot be purchased off-the-shelf. The taxpayer must prove that no commercially available software could be utilized without modifications that would themselves satisfy the innovation and risk requirements.

The development of AI-driven telematics, machine-learning shortage predictors, and physics-based AR spatial simulations in Oshkosh generally meets these exceedingly high thresholds, as these are highly bespoke systems requiring custom algorithmic coding and advanced data science that cannot be purchased from standard software vendors. The wages paid to software engineers, the cloud hosting costs for dedicated development servers on which these algorithms are trained, and the fees paid to third-party academic researchers (such as the DOD-funded automation research or the Auburn University partnership) constitute highly eligible QREs for both the federal Section 41 credit and the Wisconsin state credit.

Procedural Precedents: Navigating the Wisconsin Tax Appeals Commission

While federal statutes and United States Tax Court case law dictate the broad boundaries of IRC § 41, businesses operating in Oshkosh must also navigate the specific procedural jurisprudence of the Wisconsin Tax Appeals Commission (WTAC) to successfully secure and defend their state-level tax benefits. The WTAC serves as the critical arbiter for disputes involving income, franchise, and manufacturing property taxes.

A landmark legal precedent originating directly from the city’s manufacturing base is the case of Oshkosh Truck Corporation v. Wisconsin Department of Revenue (Docket No. 03-I-343). The facts of this case provide a crucial defensive strategy for taxpayers. In July 2001, the Wisconsin DOR audited Oshkosh Truck Corporation and issued an assessment notice for additional franchise taxes related to the 1996 and 1997 tax years. Three years later, in 2004, the corporation filed an amended petition attempting to offset this additional franchise tax by claiming, for the very first time, newly calculated R&D tax credits for those exact same 1996 and 1997 years.

The DOR aggressively moved to dismiss the credit claim, arguing that the standard four-year statute of limitations under Wis. Stat. § 71.75(2) and § 71.28(4)(h) had definitively expired, rendering the claim legally “stale.” Furthermore, the Department argued that the taxpayer’s failure to calculate and claim the credits within the original timeframe demonstrated a lack of due diligence, accusing Oshkosh Truck of operating with “unclean hands”.

In a sweeping victory for the taxpayer, the WTAC ruled in favor of Oshkosh Truck Corporation by applying the judicial doctrine of equitable recoupment. The Commission held that a taxpayer may legally use a time-barred (“stale”) refund claim to offset a timely additional tax assessment made by the state, provided the dispute arises out of the “same transaction.” The WTAC defined the “same transaction” test simply as involving the “same year or income tax period”. The Commission firmly rejected the DOR’s “unclean hands” argument, stating that failing to claim tax credits on an original return is not wrongful or unlawful conduct.

This ruling is of paramount strategic importance for any Oshkosh firm undergoing a state tax audit. It establishes an absolute legal precedent that if the DOR audits an Oshkosh manufacturer and assesses additional franchise or income tax, the manufacturer possesses the legal right to conduct a retrospective R&D tax credit study for those specific audited years. Even if the normal statute of limitations has completely closed, the newly uncovered R&D credits can be utilized defensively under equitable recoupment to eliminate the audit assessment dollar-for-dollar. However, the WTAC carefully noted that equitable recoupment is a purely defensive mechanism; it can reduce the audit liability to zero, but it cannot generate a net cash refund check from the state for the stale years.

Furthermore, the WTAC closely scrutinizes the apportionment of income and the physical geographic location of research activities. Because the Wisconsin R&D credit mandates that the research must be physically conducted within the borders of Wisconsin, the WTAC frequently examines the interplay between a taxpayer claiming the benefit of the Wisconsin R&D credit while simultaneously attempting to source their software or product revenue outside the state to avoid the Wisconsin franchise tax. In cases involving manufacturing property and software sourcing, the Commission has rejected taxpayer “look-through” sourcing positions designed to shift receipts to the location of end-use rather than the location of development. Therefore, Oshkosh businesses must ensure their state apportionment factors and property classifications align logically and legally with their claims of substantial in-state research activity.

Final Thoughts

The city of Oshkosh, Wisconsin, represents a unique, continuous microcosm of American industrial evolution. From its 19th-century origins harnessing the immense hydropower of the Fox River to dominate the timber and paper industries as “Sawdust City,” to its modern, highly complex dominance in specialty defense vehicles, experimental aviation, advanced polymer packaging, and digital manufacturing, the region has proven to be an extraordinarily fertile ground for technological innovation and engineering resilience.

The reinstatement of immediate domestic R&E expensing under the federal OBBBA of 2025 fundamentally alters the financial calculus of innovation, removing the punitive capitalization requirements of the TCJA. Combined with Wisconsin’s lucrative and increasingly refundable 25% research expense credit, this presents an unprecedented financial opportunity for regional industries to subsidize their engineering efforts. However, this legal landscape is fraught with rigid statutory tests, highly stringent contemporaneous documentation requirements, and aggressive administrative scrutiny—particularly regarding the nuances of funded research in defense contracting and the high thresholds applied to internal-use software.

By closely aligning their physical and digital engineering activities with the federal four-part test, meticulously structuring government and municipal contracts to retain absolute financial risk, and intelligently utilizing the defensive legal precedents established by the Wisconsin Tax Appeals Commission, manufacturers in Oshkosh can successfully navigate this complex regulatory environment. Doing so ensures that the economic engine of the Fox River Valley continues to drive technological advancement into the next century.

The information in this study is current as of the date of publication, and is provided for information purposes only. Although we do our absolute best in our attempts to avoid errors, we cannot guarantee that errors are not present in this study. Please contact a Swanson Reed member of staff, or seek independent legal advice to further understand how this information applies to your circumstances.