On April 2, 2026, President Trump issued Proclamation 11020 under Section 232 of the Trade Expansion Act, imposing additional tariffs on imports of patented pharmaceuticals and associated pharmaceutical ingredients. While often described as a "blanket 100% tariff," the actual structure is a multi-tier system with product-specific scope, multiple Chapter 99 headings, and company-specific effective dates driven by Annex III. CBP's July 30, 2026 Cargo Systems Messaging Service (CSMS) notice now implements this scheme in ACE, making July 31, 2026 the first real filing and payment deadline for impacted pharma importers.
Not a flat tariff: product and company filters
Proclamation 11020 targets patented pharmaceuticals and their associated ingredients. Annex I defines a subset of HTSUS lines in Chapters 29 and 30, limiting coverage to patented products approved for marketing in the United States. Generic pharmaceuticals and their ingredients are excluded and fall under a separate zero-rate Chapter 99 heading. Annex III lists specific manufacturers whose covered products become subject to Section 232 tariffs earlier (July 31, 2026) than all other companies (September 29, 2026).
The Chapter 99 pharma grid
CBP's CSMS guidance requires reporting under HTSUS headings 9903.04.60-9903.04.69. Key headings include:
9903.04.60: Patented pharmaceutical articles (Annex I) at 100% rate.
9903.04.61: Transitional zero-rate code for non-Annex III companies until September 29, 2026.
9903.04.62-9903.04.66: Reduced or zero rates for allied origins, onshoring plans, or MFN pricing agreements.
9903.04.67-9903.04.69: Generic or non-pharmaceutical articles at 0% additional duty.
Two effective dates: July 31 vs. September 29
The dual-date structure is critical. Annex III companies owe duties as of July 31. All other companies must report the appropriate Chapter 99 code starting July 31, but pay a 0% additional duty (using 9903.04.61) until September 29, 2026. Brokers must not default to 9903.04.61 for Annex III entities, nor assume Section 232 requirements are inactive for non-Annex III importers.
Importer SOP: four immediate action items
Determine Annex III status: Confirm if affiliates or contract manufacturers are listed in Annex III.
Map products: Validate HTSUS classification against Annex I and U.S. note 40.
Set ACE coding rules: Define broker instructions based on Annex III status, origin, and product type.
Monitor relief provisions: Track expiration/escalation dates for onshoring and MFN agreements, which may influence duty liability through 2030.