9903.79.09 Semiconductors 232: Public Sector Exemption Explained

Key Points

• 9903.79.09 is an exemption heading under the Section 232 semiconductors program, not a duty-imposing heading. It carries no additional duty of its own.
• The heading covers semiconductor articles, as defined in subdivision (b) of U.S. note 39 to subchapter III of Chapter 99, that are for use in United States public sector applications.
• The rate shown in the HTSUS general column is "the duty provided in the applicable subheading," meaning only the underlying Chapter 1-97 duty applies; the Section 232 semiconductor duty imposed under 9903.79.01 does not apply to qualifying goods claimed under this heading.
• Importers must meet the product-scope definition in U.S. note 39(b) and the public-sector-use requirement to claim this exclusion correctly on entry.
• All facts in this article reflect the HTSUS as of August 15, 2026. Confirm current text at hts.usitc.gov before filing.

On this page

1. What 9903.79.09 is and how it fits in the Section 232 semiconductor program
2. Product scope: what counts as a semiconductor article under U.S. note 39(b)
3. The public sector use requirement
4. Rate mechanics and how the duty calculation works
5. How 9903.79.09 appears on a customs entry alongside 9903.79.01
6. Interaction with other tariff provisions
7. Other exemption headings in the same program
8. What importers should do
9. Key references

HTS 9903.79.09 is a non-duty-bearing exemption heading within the Section 232 semiconductors program. When an importer correctly claims it, the Section 232 additional duty that would otherwise be imposed under 9903.79.01 does not apply, and only the regular Chapter 1-97 duty rate for the product is owed. The heading applies specifically to semiconductor articles, as defined in subdivision (b) of U.S. note 39, that are destined for use in United States public sector applications.

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

What 9903.79.09 is and how it fits in the Section 232 semiconductor program

The Section 232 semiconductors program imposes additional duties on a broad range of semiconductor articles entering the United States. The duty-imposing heading is 9903.79.01. Congress and the administering authority also established a set of exception and exclusion headings, numbered 9903.79.02 through 9903.79.09, each carving out a defined category of goods or end uses from that additional duty. These headings are structured as U.S. note 39 claims inside Chapter 99 of the HTSUS.

9903.79.09 is the last in that series and specifically addresses semiconductor articles for use in United States public sector applications. It does not create a new tariff or impose any charge. Its function is to signal to CBP that the importer is claiming an exemption from the 9903.79.01 duty on qualifying goods.

Product scope: what counts as a semiconductor article under U.S. note 39(b)

The official heading text limits 9903.79.09 to "semiconductor articles, as defined in subdivision (b) of U.S. note 39 to this subchapter." That cross-reference to subdivision (b) is operative. The product must meet the U.S. note 39(b) definition to qualify; ordinary commercial electronics or components that do not satisfy that definition cannot be claimed here even if their end use is a public sector project.

The HTSUS text of U.S. note 39(b) is the governing legal standard. Review it at hts.usitc.gov in Chapter 99, subchapter III, to confirm whether your specific commodity falls within the defined scope before filing an entry with this heading.

The public sector use requirement

Beyond qualifying as a semiconductor article under U.S. note 39(b), goods entered under 9903.79.09 must be "for use in United States public sector applications." This is an end-use condition, not merely a description of the buyer. Importers should be prepared to demonstrate at time of entry, and to retain documentation sufficient to satisfy a CBP post-entry audit, that the imported goods are genuinely destined for U.S. public sector use.

Because the facts block is silent on how CBP defines "United States public sector applications" for this purpose, confirm the operative CBP guidance at cbp.gov or consult the text of U.S. note 39 directly. Do not assume a broad or informal understanding of "public sector" will satisfy a binding CBP review.

Rate mechanics and how the duty calculation works

The HTSUS general column rate for 9903.79.09 is: The duty provided in the applicable subheading. That language means this heading passes through the ordinary tariff rate of the underlying Chapter 1-97 classification. The Section 232 semiconductor additional duty, which is assessed through 9903.79.01, is not added for goods properly claimed under 9903.79.09.

In practical terms, the duty calculation for a qualifying shipment looks like this:

• Identify the correct Chapter 1-97 HTS classification for the commodity and apply that general column 1 rate to the dutiable value.
• The Section 232 semiconductor additional duty under 9903.79.01 is exempted by the 9903.79.09 claim.
• Any other independently applicable duties (such as Section 301 China tariffs, antidumping or countervailing duties, or other Chapter 99 provisions) are assessed separately on their own terms.

Use the duty calculator to model your full landed cost once you have confirmed all applicable Chapter 99 provisions that interact with your shipment.

How 9903.79.09 appears on a customs entry alongside 9903.79.01

Chapter 99 headings ride alongside, not in place of, the regular Chapter 1-97 classification. On a CBP entry, the entry will carry at minimum two HTS lines for a Section 232 semiconductor shipment: the standard Chapter 1-97 line that describes the commodity, and the Chapter 99 line that identifies the program and the applicable heading.

For a shipment claiming the public sector exemption, the Chapter 99 line should reflect 9903.79.09, not 9903.79.01. Entering 9903.79.01 would flag the shipment for the additional duty rather than the exemption. Verify with your broker that the Chapter 99 line is coded correctly before the entry is filed, because correcting a miscoded Chapter 99 line after the fact requires a post-entry amendment or protest.

Interaction with other tariff provisions

Claiming 9903.79.09 exempts qualifying goods from the Section 232 semiconductor additional duty. It does not affect, waive, or interact with other independently imposed duties. If your commodity also carries:

• Section 301 tariffs on goods of Chinese origin,
• antidumping or countervailing duty orders,
• other Section 232 programs (such as the Section 232 copper program), or
• any other applicable Chapter 99 provision,

those duties are assessed independently. The 9903.79.09 exemption has no bearing on them. For background on how the Section 232 program has expanded to additional product categories, see Section 232 Expands to Copper; UK Pharma Tariffs Drop to Zero.

Other exemption headings in the same program

The Section 232 semiconductor program includes several exemption headings, each targeting a distinct category. If your goods do not qualify for the public sector exemption under 9903.79.09, review whether another heading applies:

• 9903.79.07: Consumer electronics exemption
• 9903.79.06: Startup exemption
• 9903.79.05: Research and development exemption

Each heading has its own product-scope and end-use conditions defined in U.S. note 39. Confirm the applicable text at hts.usitc.gov before claiming any of them.

For a broader overview of Chapter 99 codes active in 2026, see the 2026 tariff code overview.

What importers should do

• Verify that your commodity meets the U.S. note 39(b) definition of "semiconductor articles" by reading the current HTSUS text at hts.usitc.gov before filing any entry claiming 9903.79.09.
• Document the public sector end use of the imported goods before importation and retain that documentation to support a CBP audit or inquiry; an end-use condition that cannot be substantiated after the fact is treated as a failed claim.
• Confirm with your customs broker that the Chapter 99 line on your entry is coded 9903.79.09 rather than 9903.79.01, and that no other applicable Chapter 99 duties are being missed or double-counted.
• Check cbp.gov for any CSMS messages or binding rulings that address the public sector use condition under this program, and confirm the full HTSUS text reflects no changes since August 15, 2026.

Key references

• Harmonized Tariff Schedule of the United States, hts.usitc.gov: Official HTSUS text including Chapter 99, subchapter III, heading 9903.79.09, and U.S. note 39.
• U.S. Customs and Border Protection, cbp.gov: CBP guidance, CSMS messages, and binding ruling database for Section 232 semiconductor entries.
• Federal Register, federalregister.gov: Federal Register notices establishing and amending the Section 232 semiconductor program.
• White House, whitehouse.gov: Presidential proclamations issued under the Section 232 semiconductors program.