A tariff is a tax paid by domestic buyers. The label says “import duty.” The economics say “consumption tax.” Understanding why requires following the money through the supply chain rather than stopping at the border.

When a government places a tariff on an imported good, it raises the price that a domestic importer must pay at customs. How that cost splits depends on bargaining power. If the foreign seller needs US market access and faces stiff competition, the importer can negotiate a lower pre-tariff price, forcing the seller to absorb part of the duty. If the product has no domestic substitute and demand is inelastic, the importer passes the full cost forward to the end buyer. In practice, both sides share the burden in some ratio determined by leverage, not policy intent. The portion that lands on domestic buyers functions identically to a sales tax applied selectively to foreign goods.

The burden concentrates on products with few domestic substitutes. When buyers cannot switch to a locally made alternative, they absorb nearly the full tariff as a price increase. This is the core constraint: tariffs raise the most revenue precisely in the categories where domestic production is weakest, which means the cost lands squarely on the buyers who have the fewest options.

This pattern is observable in recent history. After the United States imposed tariffs on imported washing machines in 2018, retail washer prices rose roughly 12% within a few months. Dryer prices also climbed, even though dryers carried no tariff, because retailers price appliance pairs together. The foreign manufacturers did not cut their prices to offset the duty. Domestic consumers paid more, and the treasury collected the difference.

A concrete example makes the mechanism plain. Consider a $500 imported steel component used in American-made industrial equipment. A 25% tariff adds $125 at the border. If the importer has leverage, it might negotiate the mill down to $450, splitting the pain. The mill eats $50, the importer still pays $75 more than before. If the importer has no alternatives, the mill holds at $500 and the full $125 lands domestically. Either way, some domestic entity pays. Multiply this across thousands of components and the arithmetic becomes a broad-based cost increase on domestic production and consumption.

The implication is structural, not partisan. Any government that funds itself partly through tariffs is, in economic terms, funding itself through a consumption tax that falls on buyers of imported goods. The incidence does not change based on who announces the tariff or what rationale accompanies it. Prices adjust, supply chains transmit costs, and the final bill arrives at the point of purchase. Recognizing this mechanism does not require choosing a side. It requires reading the receipt.