Candice Horbacz
The conventional argument in favor of tariffs posits them as a mechanism to compel foreign companies to pay for market access in the United States, thereby safeguarding domestic industries. However, a closer examination reveals a more intricate reality: a significant portion of these tariffs frequently impacts American business activities, often more extensively than commonly understood. Analysis indicates that approximately half of the tariff base originates from "related-party trade"—transactions occurring between affiliated entities within the same multinational corporation. Imposing tariffs on this intra-firm commerce effectively inflates costs for U.S. production and manufacturing, operating akin to a domestic tax on the intricate U.S. production network.
For years, numerous studies have consistently demonstrated that U.S. businesses and consumers ultimately bear a disproportionate share of the tariff burden, directly contradicting the assertions made by past administrations that foreign entities would absorb these costs. While more recent evidence suggests that foreign exporters might shoulder a somewhat larger share than initial assessments indicated, the fundamental structure of modern global production introduces a critical complexity to this analysis. The interconnected nature of multinational enterprises means that the line between a "foreign" and "domestic" impact becomes blurred, as costs are often internalized and passed along within integrated supply chains.
A Deeper Look at Intra-Firm Trade Dynamics
The cost implications of tariffs are particularly pronounced due to the substantial volume of U.S. imports that occur between related parties. This category encompasses a broad spectrum of transactions, including those between U.S.-based parent companies and their overseas affiliates, as well as trade involving U.S. subsidiaries of foreign-owned parent companies. Both types of arrangements are crucial contributors to U.S. employment figures and domestic investment, playing an integral role in the American economy. These aren’t merely accidental organizational structures; multinational firms meticulously strategize the location and operation of different stages of their production processes to maximize efficiency and productivity. This optimization is driven by a multitude of factors, such as access to highly specialized labor pools, proximity to essential raw materials, or strategic positioning near key suppliers and customer bases.
U.S. manufacturers, for instance, heavily depend on a global network to source imported parts, materials, and specialized equipment, which are vital inputs for their domestic production and, by extension, support jobs within the United States. A significant majority of these imports are classified as intermediate or capital goods—components that facilitate and enhance domestic production rather than substituting it. Consequently, when tariffs are levied on these crucial imports, they directly escalate the input costs for businesses operating within the U.S., diminishing their competitive edge and potentially forcing them to pass these increased costs onto consumers or absorb them through reduced margins.
Data compiled by the Census Bureau on related-party trade vividly illustrates this phenomenon. In 2024, nearly half—specifically, 49.5 percent—of all U.S. goods imports originated from related parties. This share has remained remarkably consistent over the past two decades, fluctuating within a narrow range of 46 to 51 percent of total imports since 2005. Minor dips were observed during significant economic downturns, such as the 2008 recession and the COVID-19 pandemic, reflecting broader disruptions in global trade and supply chains. This consistent trend underscores that tariffs, rather than exclusively targeting transactions between independent foreign and U.S. firms, frequently apply to commerce within multinational enterprises. The result is that tariffs often function as an indirect tax on the sophisticated global supply chains utilized by U.S.-based businesses, irrespective of whether they are foreign-owned or domestically owned, thereby increasing production costs for their domestic operations instead of solely burdening foreign producers.
A Chronology of Recent Tariff Actions and Their Rationale
The recent surge in tariff implementation, particularly under the Trump administration, provides a critical background context for understanding the current landscape. Beginning in 2018, the U.S. government imposed a series of tariffs on various goods, most notably on steel and aluminum imports from numerous countries, citing national security concerns. This was swiftly followed by extensive tariffs on a wide range of Chinese goods, initiated under Section 301 of the Trade Act of 1974, with the stated objective of addressing unfair trade practices, intellectual property theft, and forced technology transfers. The administration’s public rhetoric consistently framed these tariffs as a means to protect American industries, bring manufacturing jobs back to the U.S., and compel foreign nations, particularly China, to modify their trade policies. The promise was clear: foreign exporters would bear the cost, and American consumers and businesses would benefit from a more level playing field.
The chronology of these tariffs involved several rounds of escalating duties, with lists of targeted goods expanding and tariff rates increasing. For example, initial tariffs on $50 billion worth of Chinese imports were quickly followed by duties on an additional $200 billion, eventually encompassing a significant portion of all goods imported from China. Throughout this period, businesses and trade associations across various sectors voiced concerns about rising input costs, supply chain disruptions, and the erosion of competitiveness. The government, in response to these domestic pressures, introduced a complex and often cumbersome exemption process, allowing some U.S. companies to apply for relief from specific tariffs if they could demonstrate that the imported goods were not available domestically or that the tariffs would cause severe economic hardship. This very mechanism of granting exemptions, however, implicitly acknowledged the domestic burden imposed by broad-based tariffs, highlighting the challenge of applying such measures in an economy deeply integrated into global production networks. The frequency of changes to tariff rates, exceeding 50 modifications since March 2025 (a reference to future uncertainty rather than past action, highlighting the ongoing volatility), further exacerbated this uncertainty, making long-term strategic planning exceptionally difficult for multinational firms.
The Direct Impact on Domestic Economy and Competitiveness
The high proportion of related-party imports into the U.S. carries profound implications for the actual incidence of tariffs and their broader impact on the domestic economy. Even after accounting for specific goods exemptions, it is estimated that 45.6 percent of the current tariff base consists of imports between related parties. In certain critical sectors, such as automotive and pharmaceutical imports, the share of related-party trade soars, often exceeding 80 percent.
Consider the automotive industry: if a Japanese automaker operates a manufacturing plant in the U.S. to produce vehicles for the North American market, it contributes significantly to domestic investment and employment. Tariffs on imported components—even if sourced from an affiliate of the same Japanese parent company—would directly increase the cost of operating that U.S. plant. This cost increase could disincentivize future investment, reduce hiring, or even lead to scaling back manufacturing operations in the U.S., thereby undermining domestic job growth and investment, despite the parent company being a foreign entity. Similarly, in the pharmaceutical sector, where related-party trade constitutes an overwhelming majority of imports, tariffs could raise the cost of essential ingredients or intermediate products, potentially impacting drug development costs, availability, and prices for American consumers.
Therefore, the argument that tariffs primarily tax foreign entities is substantially weakened by the pervasive nature of intra-firm trade and its demonstrable effects on the domestic economy. These tariffs raise operational costs for multinational production networks that businesses have painstakingly constructed over years to achieve maximum efficiency and productivity. These sophisticated structures often represent substantial, long-term investments in facilities, specialized worker training, and intricate logistics—assets that cannot be easily reconfigured in response to fluctuating tariff policies. The immediate consequence is an increase in costs for businesses operating within these networks. Any subsequent long-term adjustments, such as reshoring production or fundamentally altering supply chains, tend to result in reduced overall efficiency, as firms are compelled to optimize for tariff avoidance rather than for inherent productivity gains.
While Census data does not always delineate between imports from U.S. companies’ overseas operations and those from foreign-owned parent companies, a significant portion of what is typically perceived as imports from "foreign" companies is, in fact, sourced from American-owned affiliates. In scenarios where the importer and exporter are related entities, the conventional distinction of whether the importer or exporter absorbs the cost largely collapses, as the cost is internalized within the broader corporate structure. Even in cases of related-party trade between a foreign parent company and its U.S. subsidiary, these increased costs inevitably have repercussions for employment levels and investment decisions concerning the portion of the business conducted within the United States.
Broader Economic Fallout and Policy Uncertainty
The bottom line is that tariffs elevate costs for multinational firms, creating pressure to either increase prices for U.S. consumers or mitigate costs by slowing hiring, delaying expansions, or reducing other investments. These pricing and efficiency challenges also inevitably diminish the competitiveness of U.S. businesses in international markets. Tariffs imposed on inputs for goods manufactured in the U.S. mean that these products must either be sold at a higher price when exported to foreign markets or accepted with a reduced profit margin. This situation makes it exceedingly difficult for tariff-affected goods produced in the U.S. to compete effectively with products from lower-cost supply chains that bypass the U.S. entirely.
The negative economic ramifications are further compounded by an environment of pervasive policy uncertainty. With tariff rates experiencing frequent adjustments—a volatile trend that shows no signs of abating—businesses are left in a precarious position, unable to make the long-term strategic decisions that are fundamental to the efficient operation of a multinational company. As this uncertainty persists, businesses are increasingly inclined to delay or entirely withhold new investments or hiring initiatives, opting instead to adopt a defensive posture to weather the unpredictable trade policy landscape ahead. This hesitancy stunts economic growth, dampens innovation, and undermines the very stability that businesses require to thrive.
Statements and Reactions from Key Stakeholders
The implications of these tariffs have not gone unnoticed by various stakeholders. Business organizations, such as the U.S. Chamber of Commerce and various manufacturing associations, have consistently lobbied against broad tariffs, highlighting the negative impact on their members’ supply chains, input costs, and global competitiveness. They often point to specific case studies of companies forced to scale back operations, delay investments, or even lay off workers due to tariff-induced cost increases. These groups frequently advocate for stable, predictable trade policies that foster rather than hinder international commerce.
Economists from across the political spectrum have largely echoed these concerns. Institutions like the Tax Foundation, the Federal Reserve, and numerous academic researchers have published studies repeatedly concluding that U.S. consumers and businesses are bearing the brunt of tariff costs. Their analyses often emphasize the macroeconomic drag caused by tariffs, including reduced GDP growth, lower wages, and decreased investment.
The very existence of a comprehensive exemption process for many of the implemented tariffs serves as an implicit acknowledgment by government policymakers of the domestic economic pain caused by these measures. While presented as a mechanism to alleviate specific hardships, the extensive and often complex nature of these exemptions reveals the inherent challenge of imposing broad tariffs in an economy characterized by highly intricate global supply chains and pervasive related-party trade. It suggests that even the administrations enacting these tariffs recognized that a blanket application would disproportionately raise costs for domestic manufacturers rather than unequivocally protect them.
Methodology
The estimates regarding the related-party share of U.S. imports subject to recent tariff actions are derived from the Census Bureau’s 2024 Related-Party Trade Data, which is published at the 6-digit NAICS (North American Industry Classification System) level. Relevant NAICS codes were carefully matched to each specific tariff, either directly or through the HTSUS (Harmonized Tariff Schedule of the United States) to NAICS concordance. The related-party share was then calculated as the ratio of related imports to total imports across all matched 2024 trade. Consideration was given to various exclusions and USMCA (United States-Mexico-Canada Agreement) utilization rates to refine the accuracy of the estimates. It is important to note that NAICS codes are generally coarser than the more granular HTSUS codes that precisely define the scope of tariffs. However, this precision gap is assumed to affect both related and total imports proportionally. As related-party trade data is not published below the NAICS6 level, these figures remain estimates constrained by that resolution rather than exact tariff-line calculations.
Conclusion: A Call for Nuance in Trade Policy
The assertion that tariffs primarily serve to tax foreign entities is significantly undermined when nearly half of the tariff base involves intra-firm trade, where costs are inevitably passed through to U.S.-based production networks. By artificially inflating the cost of intermediate goods, tariffs increase the cost of capital and weaken the incentive for businesses to invest in their domestic operations. Furthermore, they encourage economically inefficient supply chain reorganization, as businesses prioritize minimizing their tariff burden over optimizing for genuine productivity and efficiency. These accumulated costs ultimately translate into higher prices for consumers, downward pressure on wages, and decreased returns to both labor and investment. Given that nearly half of all international trade now occurs between related parties, the nuances of firm ownership and corporate structure must play a far more prominent role in how economists and policymakers analyze tariff incidence.
In an increasingly globalized world where multinational firms seamlessly integrate operations across borders, tariffs are far from the straightforward instrument of foreign economic pressure they are often portrayed to be. In an economy where American and foreign businesses alike navigate complex international supply chains, tariffs frequently punish efficient operations, stifle competitiveness, and actively deter investment, rather than effectively supporting it. Policymakers are thus urged to exercise extreme caution and adopt a more nuanced approach when considering tariffs, recognizing them as a blunt instrument capable of inflicting substantial harm on American production and economic well-being—even when ostensibly targeting a foreign business. The true cost of tariffs extends far beyond the border, resonating deeply within the domestic economy.
