The Harmonized System (HS) code is a standardized number, used by customs authorities worldwide, that identifies exactly what a product is for duty and regulatory purposes. Getting it right affects two things directly: how much duty you pay, and how quickly your shipment clears customs.
Products that could plausibly fall under more than one code — a component that could be classified as a finished good or as a part, for instance — are where most classification disputes happen. The correct code depends on the product's function and composition, not on which rate is more favorable.
An incorrect HS code can result in a shipment being held for reclassification, a corrected duty assessment after the fact, or in some jurisdictions a compliance penalty. None of these are common, but all of them are more disruptive than getting the classification right at the outset.
Correct tariff classification is part of our standard customs clearance and brokerage service — if you are unsure how a product should be classified, that is a conversation worth having before the shipment departs, not after it arrives.