Both brewed and acid-hydrolyzed (HVP-based) soy sauces generally fall within the soy sauce heading, but their ingredient declarations and FDA labeling requirements differ significantly. Chemically hydrolyzed products must disclose the hydrolysis process and may have different allergen profiles. Importers should confirm the production method with the supplier to ensure accurate labeling and classification.

Because certain soy sauce origins are subject to Section 301 tariffs, a precise and verifiable certificate of origin — ideally supported by manufacturing records showing where fermentation and processing occurred — is essential. Transshipment through a third country does not change the country of origin for duty purposes, and misrepresentation can result in penalties. Consult a licensed customs broker for current Section 301 applicability by origin. Admissibility is complex; FDA prior notice and facility registration are also required.