1. What Rule 2(a) says
An incomplete or unfinished article that has the essential character of the complete article is classified as the complete article.
Unassembled goods are covered by the same logic.
2. Why the rule exists
If disassembled goods could be declared as parts, a higher rate could be avoided by shipping the same product in pieces.
Rule 2(a) closes that route.
3. When the rule applies
The components must make up a complete article once assembled.
If a key component is missing, the goods are not an unassembled complete article. They are parts.
4. Typical cases
Flat-pack furniture, classified as finished furniture.
Machinery shipped disassembled, classified as the machine.
Partial shipments missing a critical component, classified as parts.
5. Parts versus unassembled goods
Unassembled goods
Assemble into one complete article.
Parts
Used separately, or as spares.
The distinction decides the heading.
6. The common errors
Declaring unassembled complete articles as parts, which is the exact behaviour the rule is designed to catch.
Declaring a shipment as a complete article when a key component is absent.
Shipping components in separate consignments and assuming the rule applies without checking how customs treats the split.
7. A practical scenario
A company ships a machine knocked down across four containers.
The classification is the machine, not the individual parts, because the four containers together form one complete article.
If one container is held back in a later shipment, the question becomes whether the first three still amount to an unassembled complete article. That is worth settling with customs before shipping.
8. Closing view
Rule 2(a) is a reminder that the object of classification is what the goods are, not what form they take when declared.
A crate of components is, in substance, a machine.
*This article is based on General Interpretive Rule 2(a) of the Harmonized System. Exporters should confirm classification with China Customs.*