There are three main types of customs duty:
1. Ad Valorem Duty: The most common method. Customs value calculates the imported goods duty based on the customs valuation system, determined according to the WTO valuation system, then applies the rate assigned to the product.
2. Specific Duty: Calculated based on the weight of the goods multiplied by a fixed tax per unit of weight.
3. Compound Duty: For some tariff codes, both ad valorem and specific duties apply. Customs charges the higher of the two rates.
4. The World Customs Organization (WCO) developed the “Harmonized Commodity Description and Coding System (HS Code)”, classifying goods using 6-digit codes.
Taiwan extended this system by adding 7th and 8th digits for tariff classification, with corresponding import duty rates. The Ministry of Economic Affairs’ International Trade Administration further added 9th and 10th digits for trade management and statistics, and the 11th digit serves as a check code. This creates Taiwan’s unique 11-digit “CCC Code”.