Economic Effects of Import Tariffs

An import tariff is a tax imposed by the importing country on goods entering its customs territory. It raises the tariff-inclusive cost of imports, while tariff pass-through determines how much of that increase reaches domestic prices, production costs and foreign exporters. When the taxed good is an intermediate input, the tariff can propagate through downstream manufacturing supply chains.

Basic price transmission

In the competitive small-country model, the world price is fixed. A specific tariff of t raises the domestic import price from Pw to approximately Pw + t, while an ad valorem tariff at rate τ raises it to approximately Pw(1 + τ), before domestic distribution costs and taxes.

• Higher import prices reduce import demand and encourage substitution towards domestic or foreign alternatives.
• Domestic producers may also raise prices because tariff-protected imports provide a higher price benchmark and weaken competition.

Transmission through manufacturing inputs

A tariff on intermediate inputs directly raises the acquisition cost of imported components, raw materials or capital goods. It can also raise domestic input prices as local suppliers gain pricing space, transmitting the shock indirectly to firms that do not import themselves.

• Downstream manufacturers may absorb the higher cost through lower margins, raise output prices, substitute inputs, change suppliers or reduce production and investment.
• The effect is larger when the taxed input has a high cost share and few substitutes, and when downstream markets permit price increases.
• An inverted duty structure, with higher duties on inputs than on finished goods, can disadvantage domestic processing because imported final goods do not bear the same domestic input-cost burden.
• Inventories, contracts and supply-chain adjustments may delay transmission.

Incidence, competitiveness and wider effects

Although customs authorities collect the tariff from the importer, its economic incidence may be shared among consumers, importers, retailers, downstream producers and foreign exporters. Full pass-through raises prices by the tariff-equivalent amount; partial pass-through occurs when firms or suppliers absorb part through lower margins or export prices.

• A large importing country may induce foreign exporters to reduce pre-tariff prices, limiting the domestic price increase.
• A foreign tariff raises an export's landed price relative to less-taxed rivals, weakening its price competitiveness unless offset by lower export prices, productivity gains or exchange-rate movements.
• The effect is stronger when buyers can readily substitute towards rival suppliers, and weaker for differentiated goods with less price-sensitive demand.
• Aggregate price effects depend on expenditure weights, substitution, market competition, exchange rates and demand and supply responsiveness.