Why tariffs hit EMS margins first
Electronics manufacturing services run on thin margins and long bills of materials. A single board assembly can carry hundreds of distinct parts, each with its own classification and country of origin, and a box build adds enclosures, cables and fasteners on top. When the duty on one origin changes, it can touch dozens of lines across many customer programs at once.
Quotes are usually fixed before parts are bought. If the landed cost behind a quote was estimated from unit prices alone, a tariff change between quote and shipment comes straight out of margin. Seeing duty per component, per assembly and per customer program is what lets an EMS provider price it in, pass it through, or source around it.