Understanding HS Code Classification

The Harmonized System (HS) is an international 6-digit nomenclature for classifying traded goods, maintained by the World Customs Organization. National administrations extend it with additional digits — Türkiye uses the 12-digit GTİP structure.

Why classification matters

Your HS / GTİP code determines:

• Duty rate — both base customs duty and any anti-dumping or additional duties
• Required permits — control documents, conformity certificates, licenses
• Trade-agreement preferences — eligibility for reduced rates under FTAs
• Statistical reporting — trade data and quota controls

A single-digit misclassification can swing your landed cost dramatically and, in the worst case, trigger penalties and seizure.

Common mistakes

1. Reusing the supplier’s HS code without verification — overseas exporters classify under their own jurisdiction, not yours.
2. Ignoring the General Rules of Interpretation (GRI) that govern how to choose between competing headings.
3. Forgetting that classification follows function, not material for many composite goods.
4. Missing chapter notes and section notes that exclude certain items from otherwise-obvious headings.

How we help

Our licensed consultants review your product specs, prior import history, and binding ruling precedents to assign the right code — and we document the rationale so it stands up to customs scrutiny.

Need a classification review? Get in touch.