Illuminated signs — those incorporating LEDs, neon tubes, fluorescent lamps, or other light sources — are generally classified under HTS Chapter 94 as illuminated signs and nameplates. Non-illuminated signs of metal fall under Chapter 83, while those of other materials may fall elsewhere. The lighting method (LED vs. neon vs. backlit) can further affect the specific subheading, so the technical specification sheet should accompany the commercial invoice.

Yes. When a US buyer provides design files, molds, or other production assists to a foreign sign manufacturer, the value of those assists must generally be added to the transaction value of the imported goods under CBP's assist rules. Importers should document and declare assists accurately to avoid undervaluation penalties.