Understanding HS Codes for International Shipping
Learn about HS Codes and why they are used when shipping internationally
In This Article
HS Codes, sometimes referred to as Harmonized System Codes or Harmonized Tariff Codes, are internationally recognized numerical codes used to classify goods for tax purposes. These codes help standardize product classification across borders, ensuring consistency in customs documentation and tariff assessments.
Snippet: HS Code Required Callout
HS Codes Required with USPS
Beginning September 1, 2025, the United States Postal Service requires a valid six-digit Harmonized System (HS) code to be included on customs declarations for each item, regardless of mail class, for all international commercial shipments. This update aligns USPS mailing standards with new Universal Postal Union (UPU) regulations.
Why Are HS Codes Important?
HS Codes play a crucial role in international shipping by:
- Facilitating customs clearance – Customs authorities use HS Codes to determine applicable duties, taxes, and fees.
- Ensuring compliance – Many countries legally require HS Codes for import and export declarations.
- Reducing delays and errors – Proper classification helps avoid shipment hold-ups due to missing or incorrect information.
Which Countries Require HS Codes?
While most countries follow the HS Code system, certain nations strictly enforce their use in import/export documentation. Countries that explicitly require HS Codes include:
- European Union member states
- Canada
- United Kingdom
- Australia
- China
- India
Even if a destination country does not strictly enforce HS Code use, providing one ensures smoother customs processing and minimizes potential issues.
Harmonized Codes Along with Detailed Item Descriptions
Most destination countries use Harmonized System codes for product classification, while a few countries require a detailed item description instead. To ensure smooth customs processing and compliance, it is best practice to include both the Harmonized System Code and a detailed description for each item in the shipment. Providing both ensures that customs authorities can quickly and accurately classify the goods, reducing the risk of delays or incorrect tariff assessments.
In fact, most European Union countries now require both the Harmonized Code and a detailed item description of the package contents on the customs forms.