Customs Duty
A tax imposed on goods when transported across international borders.
Definition
Customs duty is levied by a country on imports or exports to generate revenue or protect domestic industries.
Overview of Customs Duty
A customs duty is a tax levied by a national government on goods crossing an international border, typically assessed as a percentage of the declared customs value (ad valorem duty) or as a fixed amount per unit of measure (specific duty), or a combination of both (compound duty). In the United States, customs duties are administered by CBP under the Harmonized Tariff Schedule of the United States (HTSUS), which classifies every commercially traded commodity under a 10-digit code. The duty rate applicable to a shipment is determined by the commodity's HTS classification and the country of origin of the merchandise — preferential rates apply to goods from countries with which the US has free trade agreements. Ad valorem duties — the most common form — are calculated as a percentage of the customs transaction value. A 5% ad valorem duty on a $10,000 shipment yields a $500 duty payment. Specific duties are expressed as a rate per unit (e.g., $0.40 per kilogram), making the duty amount independent of price. Compound duties combine both elements. In addition to the basic duty rate, imported goods may be subject to Section 201 safeguard duties, Section 232 national security tariffs (steel, aluminum), Section 301 punitive duties on Chinese-origin goods, and antidumping/countervailing duties (ADD/CVD) on specific commodities from specific countries — each layered on top of the column 1 general rate of duty. On WareMatch, understanding customs duty structures is relevant to how importers design their supply chain and select fulfillment infrastructure. Bonded warehouses defer duty payment until merchandise is withdrawn for consumption — useful for importers managing cash flow on duty-intensive goods or holding imported inventory for potential re-export (which avoids duty entirely). FTZ (Foreign Trade Zone) facilities offer duty manipulation options: merchandise can be imported, assembled with domestic components, and re-exported with duty only on the value added within the US. Importers sourcing warehousing on WareMatch in duty-intensive categories should specifically evaluate bonded and FTZ facilities as part of their total landed cost analysis.
Role
A tax imposed on goods when transported across international borders.
Focus
A customs duty is a tax levied by a national government on goods crossing an international border, typically assessed as a percentage of the declared customs value (ad valorem duty) or as a fixed amount per unit of measure (specific duty), or a combination of both (compound duty). In the United States, customs duties are administered by CBP under the Harmonized Tariff Schedule of the United States (HTSUS), which classifies every commercially traded commodity under a 10-digit code. The duty rate applicable to a shipment is determined by the commodity's HTS classification and the country of origin of the merchandise — preferential rates apply to goods from countries with which the US has free trade agreements. Ad valorem duties — the most common form — are calculated as a percentage of the customs transaction value. A 5% ad valorem duty on a $10,000 shipment yields a $500 duty payment. Specific duties are expressed as a rate per unit (e.g., $0.40 per kilogram), making the duty amount independent of price. Compound duties combine both elements. In addition to the basic duty rate, imported goods may be subject to Section 201 safeguard duties, Section 232 national security tariffs (steel, aluminum), Section 301 punitive duties on Chinese-origin goods, and antidumping/countervailing duties (ADD/CVD) on specific commodities from specific countries — each layered on top of the column 1 general rate of duty. On WareMatch, understanding customs duty structures is relevant to how importers design their supply chain and select fulfillment infrastructure. Bonded warehouses defer duty payment until merchandise is withdrawn for consumption — useful for importers managing cash flow on duty-intensive goods or holding imported inventory for potential re-export (which avoids duty entirely). FTZ (Foreign Trade Zone) facilities offer duty manipulation options: merchandise can be imported, assembled with domestic components, and re-exported with duty only on the value added within the US. Importers sourcing warehousing on WareMatch in duty-intensive categories should specifically evaluate bonded and FTZ facilities as part of their total landed cost analysis.
Example
See the definition above for context.
Benefits
- Understanding duty structure enables accurate landed cost modeling before committing to a sourcing or supply chain design
- Free trade agreement utilization (USMCA, CAFTA-DR, etc.) legally reduces or eliminates duty on qualifying merchandise
- Bonded warehouse and FTZ programs defer or reduce duty liability for high-duty-rate commodities
- Correct tariff classification prevents overpayment of duties and post-audit penalty exposure
- ADD/CVD monitoring protects importers from unexpected duty assessments on affected commodity categories
- Duty drawback programs allow recovery of duties paid on imported merchandise that is subsequently exported
FAQs
Q: How are import duties calculated, and what is the total duty cost on a shipment?
A: Multiply the dutiable value by the applicable duty rate. For a $50,000 shipment with a 6.5% duty rate, the duty is $3,250. However, the total entry cost includes additional fees: Merchandise Processing Fee (MPF, 0.3464% of value, min $29.66 / max $614.35), Harbor Maintenance Fee (HMF, 0.1250% for ocean entries), and any Section 301, ADD, or CVD duties that apply in addition to the column 1 rate. Get a full estimate including all fees, not just the basic duty rate.
Q: What are Section 301 tariffs and which goods are affected?
A: Section 301 tariffs are punitive duties imposed by the US on goods of Chinese origin, authorized under Section 301 of the Trade Act of 1974. They were originally imposed in 2018–2019 in four rounds on a broad range of goods from China and range from 7.5% to 25% in addition to normal column 1 duties. The Biden and Trump administrations have maintained and in some cases increased these rates. Check the USTR Section 301 list and the current HTSUS for the combined duty rate applicable to your HTS classification and Chinese origin goods.
Q: What is duty drawback and how can importers use it?
A: Duty drawback is a CBP program under 19 USC 1313 that allows importers to recover up to 99% of duties paid on imported merchandise that is subsequently exported from the United States — either as the same goods (direct identification drawback), substantially transformed (manufacturing drawback), or substituted with commercially interchangeable merchandise. Companies with significant import-then-export programs (components imported, assembled, exported; or merchandise imported and re-exported) should evaluate whether drawback applies to their operations. Claims must be filed within 5 years of importation.
Q: How can changing the country of origin affect my duty liability?
A: Country of origin determines the applicable duty column and whether free trade agreement rates apply. Shifting sourcing from a non-FTA country to a USMCA-qualifying country (Mexico or Canada) can eliminate duty on qualifying merchandise. However, origin is determined by the rules of origin in the applicable tariff schedule — simple transshipment or minor processing does not change origin. Anti-circumvention rules specifically target supply chain changes designed to avoid ADD/CVD orders. Work with a customs attorney before making supply chain changes intended to optimize duty exposure.