Free Tool

Supplier HS Code Validator

The most common US import error: copying a supplier's HS code directly onto your customs entry. Foreign HS codes are 6–8 digits; US HTS codes are 10 digits and diverge at digit 7. This tool shows every US 10-digit code that matches your supplier's code, with duty rates and Section 301 / IEEPA flags.

Why this matters

Chinese HS codes share the first 6 digits with the international Harmonized System, but diverge at digits 7 and 8. US HTS codes add digits 9 and 10 for statistical and program purposes. A product classified under Chinese HS 8471.30 could map to multiple US HTS codes — each with a different duty rate or Section 301 applicability.

Customs attorneys routinely find systematic underpayment (and overpayment) from importers who filed their supplier's code unchanged. CBP can audit entries for up to 4 years after liquidation. Retroactive duty assessments plus interest can reach six figures for high-volume importers.

If uncertain about the correct US code, consider filing a CBP binding ruling before your first shipment.