Taiwan's government is warning exporters that Washington may soon look far deeper into where products really come from, a headache for factories that use Chinese parts.

• The Trump administration is expanding what counts as illegal rerouting of goods, beyond just where a product was finally assembled.
• US officials may also start checking whether Chinese materials, parts, investment, or companies are involved at all.
• Taiwan's trade office is telling exporters to ask US customs for an advance ruling on origin before shipping.
• Since May last year, anyone exporting Taiwan-made goods to the US must sign a sworn origin declaration.
• Falsely labeling foreign goods as made in Taiwan now brings heavy fines, starting at NT$600,000 for a first offense.

Outlook: Expect tighter checks and more paperwork for Taiwanese exporters, with companies that rely on Chinese inputs facing the most risk.