HTS classification is where every deal starts
The Harmonized Tariff Schedule (HTS) code determines duty rate quota status and which partner-agency rules (FDA USDA EPA CPSC FCC) apply. A wrong code isn't a paperwork issue it's the top cause of CBP reassessment and penalty notices.
Get a binding ruling from CBP (free 30 90 days) for any SKU where the code isn't obvious. It survives audits and shifts liability off the importer.
