Trade rebates face economic hurdles

The U.S. Supreme Court ruled on February 20, 2026, that tariffs imposed in early 2025 under the International Emergency Economic Powers Act were illegal. The decision led to litigation after the U.S. Court of International Trade ordered the collected tariff revenue reimbursed to importers of record—those who originally paid the duties.

Reimbursement sparked a dispute over who ultimately bore the cost. Downstream purchasers, including distributors and retailers, sued importers, claiming they absorbed price increases tied to the tariffs. The question of whether and to what extent importers passed those costs along emerged as a central issue.

Pass-through as a key legal issue

Economists have studied how cost increases—from tariffs, taxes, or supply shocks—spread through supply chains. The outcome varies by industry, product, and region, making a single legal standard difficult to apply.

In antitrust cases, courts have sometimes rejected pass-through models, denying class certification for indirect purchasers. In In re Graphics Processing Units Antitrust Litigation, a federal court ruled that proving pass-through required case-by-case evidence. Yet in In re TFT-LCD (Flat Panel) Antitrust Litigation, courts allowed class-wide claims, showing inconsistency in the legal approach.

The IEEPA tariffs created widespread disruption. Unlike targeted trade measures, these duties applied broadly, causing rapid shifts in supply chains and bargaining power. Traditional economic models may not fully capture these changes, especially when other policies overlapped with the IEEPA duties.

Pass-through also depends on who could resist price increases. Large retailers often negotiate rebates or pressure suppliers to absorb costs. Consumers, with little leverage, may simply stop buying if prices rise too much. Outcomes vary: some firms absorbed costs entirely, while others passed them on fully, depending on market conditions.

Measuring the ripple effect

Economists use different methods to estimate pass-through, each with limitations. Regression models link upstream costs to downstream prices but struggle with complex supply chains. Quasi-experimental designs compare affected products to similar but unaffected ones, though finding a true control group is difficult when tariffs affect entire economies.

Structural models simulate policy impacts but need detailed data. In WTO disputes, these models help quantify antidumping duties, though they may not fit the rapid, economy-wide shocks of IEEPA tariffs.

The challenge grows when considering inventory delays. Retailers may have sold pre-tariff stock for months before adjusting prices. Studies on retail pass-through show wide variation—some found rates as low as 14%, while others saw prices rise beyond the tariff amount.

Border pass-through adds complexity. Foreign exporters sometimes reduce pre-tariff prices, shifting part of the burden away from U.S. importers. The difference suggests costs were absorbed elsewhere in the supply chain.

Other economic factors play a role. Inflation, exchange rates, and policy changes can obscure the tariffs’ impact. Companies may avoid tariffs by moving production. These shifts often bring new costs—higher labor expenses or longer shipping times—which may or may not reach consumers.

The Supreme Court’s decision created legal and economic uncertainty. Courts must now determine if pass-through can be proven broadly or if each case requires its own evidence. The answer remains unclear.