Many Chapter 99 provisions are origin-specific — Section 301 measures, for instance, apply to goods of Chinese origin but not to identical goods from other countries. The correct five-digit Chapter 99 code therefore depends on both the product's primary HTS classification and its country of origin, making origin documentation a critical compliance element.

If a duty suspension or exclusion expires before the date of importation, the standard duty rate applies even if the goods were purchased or shipped while the provision was active. Importers should confirm the expiration date of any applicable Chapter 99 provision against the expected arrival date and factor potential duty changes into contract pricing and landed-cost models.