The tariff list was rewritten overnight, and a hundred new product lines took effect at 12:01 a.m. ET on Oct. 30, 2026. BDO Canada's summary of the Oct. 23 proclamation, covered by Container News in October 2026, shows 22 HTS lines removed and 100 added, spanning paints, soaps, carpets, chest freezers, power tools and valves.
Two features make the change easy to get wrong. The Section 338 duty applies regardless of whether goods qualify under CUSMA, and it stacks on top of Section 232 duties. A shipment that cleared cleanly last month can be misclassified today purely because the list moved.
The list changed overnight. Your classifications should change with it.
That is a data discipline problem inside exporters' own systems. Product masters, tariff codes and shipping documentation have to be rechecked line by line against the new list, and the ERP has to reflect the stacked treatment before the next shipment, not after the first reassessment. Exporters tightening this through systems integration for operations should treat tariff tables as maintained data with an owner and a review date.
Pull every product you ship to the United States, match it against the Oct. 30 list, and confirm the duty treatment in your ERP and paperwork before the next load leaves. Overnight rewrites punish whoever files from memory.