9903.04.63: Section 232 Pharmaceuticals UK Heading at 0%

Key Points

• 9903.04.63 is a Chapter 99 heading in the Pharmaceuticals 232 program for patented pharmaceutical articles that are the product of the United Kingdom, as defined in subdivisions (c) and (g) of U.S. note 40.
• The rate on this heading is 0 percent additional duty.
• The legal authority is Proclamation 11020 (91 FR 18183) and U.S. note 40, with effective dates of July 31, 2026 for Annex III and September 29, 2026 for all companies.
• The heading is a Chapter 99 line that is reported alongside the regular chapter 1 to 97 tariff line for the goods, so the product classification still matters.
• The plan and MFN-pricing mechanics are not in this article's source facts, so confirm them in U.S. note 40 in the current HTSUS.

On this page

1. What 9903.04.63 is
2. Affected products and country scope
3. Rate and effective dates
4. Interaction with other tariff provisions
5. How the heading appears on an entry
6. What importers should do
7. Key references

9903.04.63 is the Section 232 pharmaceuticals heading for patented pharmaceutical articles that are the product of the United Kingdom, and it carries 0 percent additional duty. Importers and brokers who bring in patented pharmaceuticals of UK origin need to know it, because it is the line that tells CBP which Section 232 treatment applies to those goods. This article reflects the facts as of October 2026.

The links in this article go to the primary documents: the proclamations, Federal Register notices, and official tariff schedule pages themselves. Read the source.

What 9903.04.63 is

The official heading text reads: "Patented pharmaceutical articles that are the product of the United Kingdom as defined in subdivisions (c) and (g) of U.S. note 40 to this subchapter." It sits in the Pharmaceuticals 232 program, which is built on Section 232 and implemented through Proclamation 11020 (91 FR 18183) and U.S. note 40 to the relevant subchapter of Chapter 99.

You can read the heading and the note directly in the official Harmonized Tariff Schedule. Proclamations are posted on the White House presidential actions page, and the Federal Register citation can be searched at federalregister.gov.

Affected products and country scope

Product scope

The heading text limits the code to "patented pharmaceutical articles." Whether a particular product qualifies depends on how U.S. note 40 defines the term and on the product's classification in the chapter 1 to 97 schedule. This article does not list covered subheadings. Check the note and the product's HTS line before relying on the heading.

Country scope

The heading applies to articles that are the product of the United Kingdom, "as defined in subdivisions (c) and (g) of U.S. note 40." Those subdivisions control what counts as a UK product for this purpose. Do not assume that shipping from the UK, or a UK seller on the invoice, is enough. Country of origin and the note's definitions are what count.

For any plan or MFN-pricing conditions connected to this treatment, go to U.S. note 40 itself. Those mechanics are not described here, and you should confirm them in the current HTSUS or with your broker.

Rate and effective dates

The rate is 0 percent additional duty. That means the heading does not add a Section 232 duty on qualifying goods. It does not mean the goods are free of every other duty. The ordinary duty on the chapter 1 to 97 line is a separate matter.

The effective dates attached to this authority are:

• July 31, 2026, for Annex III.
• September 29, 2026, for all companies.

Both dates have passed as of October 2026. The source facts do not spell out which importers or products fall under the Annex III date and which fall under the all-companies date. Read U.S. note 40 and the proclamation to see how your goods are treated, and confirm with your broker if the answer is not clear.

Interaction with other tariff provisions

The source facts do not describe how this heading stacks with other duties, so do not assume an answer. Confirm in the current HTSUS how it interacts with the regular duty on the product line and with any other Chapter 99 measures that could apply to the same goods.

Some background reading may help:

• Our article on 9903.04.60 covers another heading in the same Section 232 pharmaceuticals family. Comparing headings shows how the program sorts goods by condition.
• For the wider list of Chapter 99 headings in force this year, see the 2026 tariff code overview.
• For how separate IEEPA-based duties work and what happened to them, see Reciprocal Tariffs Explained.

How the heading appears on an entry

A Chapter 99 heading does not replace the product's regular tariff line. The usual practice is to report the Chapter 99 number alongside the chapter 1 to 97 line for the same goods. For this code, that means the entry carries the pharmaceutical's normal HTS classification plus 9903.04.63 when the goods meet the heading text.

Because the rate is 0 percent, a wrong heading will not necessarily show up as an obvious dollar difference. It can still be an error. If the goods were not UK products as the note defines them, or a different Section 232 heading applied, the entry is misreported. Check the CBP website for current guidance and CSMS messages on this program.

If a heading choice on a past entry looks wrong, review the options for correcting it. Our guide to the ACE protest module explains how protests are filed and tracked.

What importers should do

• Read subdivisions (c) and (g) of U.S. note 40 in the current HTSUS and document why each shipment's goods are patented pharmaceutical articles that are the product of the United Kingdom.
• Confirm with your broker which effective date, July 31, 2026 for Annex III or September 29, 2026 for all companies, applies to your goods and your company.
• Check U.S. note 40 for any plan or MFN-pricing conditions, and keep the supporting records with the entry file.
• Audit recent entries for correct pairing of the chapter 1 to 97 line with the right 9903.04 heading.

Key references

• Harmonized Tariff Schedule (USITC): the official text of 9903.04.63 and U.S. note 40.
• Federal Register: search here for 91 FR 18183, the citation for Proclamation 11020.
• White House presidential actions: the landing page for proclamations, including Proclamation 11020.
• U.S. Customs and Border Protection: guidance and CSMS messages on Chapter 99 reporting.