Duty is determined by origin, not just the HS code
Import duty is calculated from two things together: the product's HS (Harmonized System) classification code, and its country of origin. The same HS code can carry a different duty rate — or qualify for a reduced or zero rate — depending on where the goods actually originated and whether a trade agreement between that origin country and the destination country applies. This is why "made in China" versus "assembled in Vietnam from Chinese components" can mean a materially different landed cost for the identical physical product, if the destination country has a preferential trade agreement with one origin but not the other.
See the HS Codes guide for how classification itself is determined; this guide focuses on the origin and trade-agreement side of the duty calculation.
Rules of origin: why passing through a country isn't enough
Trade agreements don't just require the shipment to pass through a member country — they require the goods to satisfy that agreement's specific rules of origin, usually a "substantial transformation" test proving meaningful manufacturing happened there, not just a relabeling or repackaging stop. Claiming a preferential rate typically requires a certificate of origin issued according to that specific agreement's requirements, along with documentation proving the rules-of-origin test is met. Without that documentation, customs applies the standard non-preferential rate even if the goods might otherwise have qualified.
Two agreements buyers ask about most
Beyond these two, China is a party to a number of other bilateral and regional free trade agreements not covered here in detail — the same principle applies to all of them: origin must be genuinely earned through substantial transformation, and the specific agreement's rules of origin and documentation requirements must be met to claim any preferential rate.
Additional duties on Chinese-origin goods
Beyond standard HS-code duty rates, some destination markets apply additional tariffs specifically to goods of Chinese origin under trade-remedy or national-security provisions — such as Section 301 tariffs in the US, covering a specific list of HS codes rather than all Chinese-origin goods. These additional tariffs stack on top of the base duty rate and change periodically with policy shifts, so the applicable rate for a given HS code should be confirmed close to the time of shipment, not assumed from a prior order.
What is Tariffs Trade Agreements, and what decision does it help the reader make?
Confirm the correct HS classification and country of origin for your specific product before committing to a supplier location, especially if a lower duty rate through a trade agreement is part of your cost planning. Tariff classification and eligibility for preferential rates are ultimately determined by your destination country's customs authority — a licensed customs broker or trade compliance professional should confirm the applicable rate and any origin documentation required before you rely on it in your cost model.
Confirming HS classification and origin from China
Getting the HS code and origin story right starts at the factory — a supplier who can clearly document where manufacturing actually took place, and what "substantial transformation" occurred there, is what makes a certificate of origin claim defensible later. LifaSourcing.com helps confirm HS classification and coordinate origin documentation with your supplier before shipment, so the duty assumptions in your cost model hold up when the shipment actually clears.
Mistakes this guide prevents
- Assuming a trade agreement applies because goods "passed through" a member country. Origin is earned by substantial transformation, not transit.
- Building a cost model on a duty rate from a prior order. Trade-remedy tariffs and rates change; confirm close to shipment.
- Skipping the certificate of origin when a real preferential rate was available and documentable.
- Confusing RCEP eligibility with universal China preference. RCEP only helps shipments between RCEP member countries, not shipments to non-member destinations.
- Not checking for Section 301 or similar trade-remedy tariffs that stack on top of the base HS-code rate for specific product categories.