Getting your HSN (Harmonized System of Nomenclature) code wrong can cause customs delays, incorrect duty charges, or even shipment rejection. Here's what every exporter should know.
What is an HSN code?
The Harmonized System is an internationally standardized system of names and numbers for classifying traded products, maintained by the World Customs Organization. Nearly every country uses it as the basis for customs tariffs and trade statistics.
How the code structure works
The code gets more specific as you add digits:
- First 2 digits — Chapter (broad category, e.g. 61 = knitted apparel)
- Next 2 digits — Heading (more specific group, e.g. 6109 = t-shirts, knitted)
- Next 2 digits — Subheading (international standard stops here, 6 digits)
- Remaining digits — Country-specific extension (India uses 8 digits total for exports)
The first 6 digits are the same worldwide. The last 2 (in India's case) are assigned locally and can affect the exact duty rate or scheme eligibility.
Why classification matters
The HSN code determines:
- The customs duty rate applied
- Whether the product qualifies for any free trade agreement preference
- Eligibility for export incentive schemes
- Any additional certificates or restrictions that apply
Common mistakes to avoid
- Classifying by brand name instead of composition — customs cares about what the product is made of and its function, not its marketing name.
- Using a competitor's code without verification — even similar-looking products can fall under different codes based on material or processing.
- Ignoring the country-specific digits — the first 6 digits might match, but local extensions can affect duty and paperwork.
- Not updating codes when a product changes — a small change in material or use can shift the correct classification.
How to find your code
Start by searching your product's likely category using a keyword-based tool, then cross-check the exact 8-digit code with your country's official tariff schedule (CBIC in India) or confirm with a customs broker — especially for anything with ambiguous composition.