Import Tariff
An import tariff is a tax levied on goods and services imported into a country. It may be charged as a percentage of the value of the import, an ad valorem tariff, or as a fixed amount per unit, a specific tariff, or as a combination of the two. Tariffs raise revenue for the government, raise the domestic price of imported goods, and protect domestic producers, and they are among the oldest and most widely used instruments of trade policy. Their effects are analysed with the tools of supply, demand, and economic surplus.
Types and structure
An ad valorem tariff is expressed as a percentage of the customs value of the imported good, and it scales automatically with price changes. A specific tariff is a fixed charge per unit, which provides more protection when prices are low and less when they are high, and which can protect against under-invoicing. A compound tariff combines the two. Tariff schedules may distinguish by product, by country of origin, and by the purpose of import, and preferential rates are common under free trade agreements.
Tariffs can be designed in complex ways. A tariff escalation structure imposes higher rates on processed goods than on raw materials, protecting domestic processing industries. Tariff rate quotas allow a quantity to enter at a low rate and impose a higher rate above that threshold. Bound rates, agreed in international commitments, set ceilings on applied rates, providing predictability for traders and limiting arbitrary increases.
Economic effects
A tariff raises the domestic price of the imported good above the world price, benefiting domestic producers, who receive a higher price and expand output, and the government, which collects revenue. It harms domestic consumers, who pay higher prices and reduce consumption, and it creates deadweight loss, because some mutually beneficial trades do not occur and because resources are diverted to less efficient domestic production. The distribution of these effects depends on the elasticities of supply and demand.
The incidence of a tariff, that is, how the burden is shared between domestic consumers and foreign producers, depends on the elasticities. If foreign supply is highly elastic, domestic consumers bear most of the cost through higher prices. If domestic demand is highly elastic, foreign producers may bear part of the cost by lowering their export prices. The welfare cost to the importing country is the sum of the consumption distortion, the production distortion, and any terms-of-trade effect.
Rationales
Several rationales are offered for tariffs. Revenue is important for governments with limited capacity to collect other taxes, although tariffs distort trade and fall on consumers and importers. Protection of infant industries is argued to allow domestic firms to grow until they can compete internationally, although the policy risks creating permanent dependence. National security arguments justify protection of industries deemed essential, and strategic trade arguments suggest that protection can shift profits to domestic firms in imperfectly competitive markets.
Counterarguments emphasise the costs. Tariffs raise prices for consumers and for firms that use imported inputs, reducing competitiveness. They invite retaliation, which can escalate and harm all parties. They protect inefficient producers and slow the reallocation of resources to more productive uses. Empirical evidence generally finds that liberalisation raises productivity and growth, and that protection imposes larger costs than the benefits it confers, although the effects vary with the circumstances.
Policy and institutions
Tariffs are governed by international rules that seek to reduce barriers and to prevent arbitrary increases. Negotiations have lowered tariffs substantially over successive rounds, and commitments bind applied rates. Dispute settlement provides a mechanism for resolving complaints, and preferential agreements create lower tariffs among members, raising the question of whether such agreements promote or divert trade. Trade facilitation measures complement tariff reduction by reducing the time and cost of moving goods across borders.
Countries use a combination of tariffs and other measures. Non-tariff measures, including standards, quotas, and licensing, may be used where tariffs are constrained, and their effects can be similar or larger. The design of trade policy therefore requires attention to the full set of instruments and to their interaction, and to the adjustment costs that accompany changes in protection. The objective is to secure the gains from trade while managing the disruption that openness can bring.
Tariffs in a global context
Tariffs operate within a global trading system governed by rules and agreements. Successive rounds of multilateral negotiations have lowered tariffs substantially, and countries have bound their rates, providing predictability for traders. Preferential agreements create lower tariffs among members, but they also raise questions about trade diversion, in which imports are switched from more efficient non-members to less efficient members, and about the consistency of overlapping agreements.
Disputes over tariffs are resolved through agreed procedures, and the threat of retaliation disciplines unilateral increases. The system is imperfect, and disagreements arise about whether measures are consistent with commitments, about the treatment of state enterprises, and about the scope of rules in new areas such as digital trade and the environment. The framework nonetheless provides a basis for limiting protectionism and for resolving conflicts.
Tariffs and domestic industry
Tariffs affect domestic industry in complex ways. They protect producers of the tariffed good, raising their output and employment, but they raise costs for industries that use the good as an input, reducing their competitiveness. The net effect on employment depends on the relative sizes of the protected and user industries, and it may be smaller than the gross gains in the protected sector, because the losses are dispersed.
Over time, protection can reduce incentives to improve efficiency, and industries that are shielded from competition may fall behind. Where protection is temporary and accompanied by measures to raise productivity, the outcome can be different, but the evidence suggests that protection often persists and that the intended adjustment does not occur. The design of any protection must therefore consider its duration and its interaction with other policies.
Reform and adjustment
Trade liberalisation involves adjustment. Removing a tariff lowers prices for consumers and users, but it also reduces output and employment in the protected industry, and workers and regions may face transition costs. Programs to support adjustment, including retraining, relocation assistance, and support for affected communities, can ease the transition and make liberalisation more sustainable, and their design affects the political feasibility of reform.
The sequencing and pace of reform also matter. Gradual liberalisation, with clear and credible commitments, gives firms and workers time to adapt, while abrupt changes can cause disruption. Complementary policies, including investment in infrastructure and in education, can help to ensure that the gains from trade are realised and that they are shared. The objective is to capture the benefits of openness while managing the costs for those who are affected.