US trade policy has seen sweeping use of Section 232 and Section 301 tariff measures over recent years, materially changing the landed cost of many imported goods. For US importers, tracking these regimes is now a core part of customs planning.
What the two regimes do
Section 232 tariffs address national security concerns and have been applied to steel and aluminium imports. Section 301 tariffs respond to unfair trade practices and have been applied to a very broad list of goods from China. Both operate as additional duty layers on top of normal HTSUS duties, and both are subject to ongoing review, exclusion processes, and policy shifts.
Practical monitoring for importers
Because exclusion lists and product scopes change, importers should monitor Federal Register notices and CBP guidance closely. Where an exclusion applies, filing a post-summary correction or protest may recover overpaid duty. Product scope turns on precise HTSUS classification, so even small classification errors can trigger or exclude significant duty.
Practical steps: build tariff treatment into landed cost models, maintain documentation supporting any exclusion claims, and review new product lines for potential 232/301 exposure at the sourcing stage. A standards-assessed customs broker or trade compliance adviser can help interpret the changing rules and protect margin.
