Customs duty is a tax imposed by a government on goods when they are imported into (and sometimes exported from) a country, calculated on the value, quantity or classification of the goods.
Customs duty is a tax that a government charges on goods when they cross its border — most often on imports, and in some cases on exports. It is one of the oldest forms of taxation and remains a key factor in the total landed cost of any international shipment. Understanding customs duty is essential for importers, exporters and B2B buyers who need to calculate accurate prices.
The amount of duty depends on the classification of the goods, their customs value and their country of origin. Trade agreements, exemptions and special schemes can all change how much duty is actually payable.
Customs duty is a charge levied by customs authorities on goods entering (or sometimes leaving) a country. Governments use customs duties to raise revenue, protect domestic industries, and regulate the flow of specific goods. The duty becomes payable when the goods are cleared for the domestic market during customs clearance.
The rate that applies is set out in the country's tariff schedule and is linked to the product's HS Code. Because the HS classification drives the rate, correct classification is essential to pay the right amount and avoid penalties.
Customs duty is typically calculated on the customs value of the goods, which usually reflects the transaction value shown on the commercial invoice, and may include freight and insurance depending on the valuation method and Incoterms. There are three common ways duty is charged:
In addition to basic customs duty, imports may attract other charges such as domestic taxes, surcharges or anti-dumping duties, depending on the country and the product.
Customs duties come in several forms, including basic import duty, protective duties designed to shield domestic industry, anti-dumping duties applied to unfairly low-priced imports, countervailing duties that offset foreign subsidies, and export duties charged on certain goods leaving a country. The exact structure varies by national law.
One of the most powerful ways to lower customs duty is through a trade agreement. When two countries share a free trade agreement, qualifying goods may enter at a reduced or zero duty rate. To claim this benefit, the goods must meet the agreement's rules of origin and be supported by a valid Certificate of Origin. For buyers, this can dramatically reduce landed cost.
India applies customs duties based on an eight-digit classification derived from the Harmonized System. Buyers importing from India, and Indian importers sourcing components from abroad, should confirm the applicable duty using the correct HS classification and check whether any preferential rate applies under India's trade agreements. Duty-deferral options such as bonded warehouses and Special Economic Zones can also affect when and whether duty is paid.
To manage duty well, businesses should classify products correctly under the HS system, declare an accurate customs value, check for applicable trade-agreement rates, and keep documentation consistent across the invoice, packing list and certificate of origin. Errors in classification or valuation are among the most common causes of overpaid duty, clearance delays and penalties.
Customs duty is a central element of international trade and a major component of landed cost. Calculated from the classification, value and origin of goods, it can be reduced through trade agreements and managed through correct documentation and duty-deferral schemes. Importers and B2B buyers who understand how customs duty works can price more accurately, source more competitively and avoid costly compliance mistakes.