9903.79.03: Data Center Semiconductor Exemption Explained

Key Points

• 9903.79.03 is an exemption heading, not a duty heading: it carries no additional duty of its own and exists to exclude qualifying goods from the Section 232 semiconductor duty imposed under 9903.79.01.
• To claim this heading, the imported goods must qualify as "semiconductor articles" under subdivision (b) of U.S. note 39 to Chapter 99, and must be destined for use in U.S. data centers as defined in subdivision (d) of that same note.
• Because 9903.79.03 imposes no additional rate, the duty payable on a qualifying entry is simply "the duty provided in the applicable subheading" in Chapters 1 through 97, with no Section 232 semiconductor surcharge added on top.
• The definitions that determine eligibility, including what counts as a "semiconductor article" and what counts as a "U.S. data center," are set out in U.S. note 39 to Chapter 99 of the HTSUS; confirm both definitions against the current schedule before filing.
• Facts in this article reflect the HTSUS as of August 13, 2026; verify current text at hts.usitc.gov before each entry.

On this page

1. What 9903.79.03 is and how it fits in the Section 232 semiconductor program
2. Scope: semiconductor articles and U.S. data centers defined
3. Rate and duty mechanics
4. How 9903.79.03 stacks with other tariff provisions
5. How the exemption appears on an entry
6. What importers should do
7. Key references

9903.79.03 is a Chapter 99 exemption heading within the Section 232 semiconductors program. It covers semiconductor articles, as defined in subdivision (b) of U.S. note 39 to Chapter 99, that are for use in U.S. data centers, as defined in subdivision (d) of that note. Importers who can demonstrate that their goods satisfy both definitions claim this heading alongside their regular Chapter 1-97 classification and pay no Section 232 semiconductor duty on those goods. The rate stated in the HTSUS for this heading is simply "the duty provided in the applicable subheading," meaning the ordinary column 1 general rate applies and nothing more is added.

The links throughout this article point to primary documents: the official tariff schedule, relevant proclamations, Federal Register notices, and CBP guidance pages. Read the source before making classification decisions.

What 9903.79.03 is and how it fits in the Section 232 semiconductor program

The Section 232 semiconductors program imposes an additional duty on semiconductor articles through the heading 9903.79.01. That heading is the duty-bearing heading. Directly beneath it, headings 9903.79.02 through 9903.79.09 are exclusion and exception headings established under U.S. note 39 to the subchapter. These sub-headings identify categories of semiconductor articles that are carved out of the surcharge. 9903.79.03 is one of those carve-outs.

Framing matters for compliance purposes. An importer does not "pay" 9903.79.03; they claim it. The heading functions as an affirmative assertion that the shipment meets both the product definition and the end-use condition set by U.S. note 39, and that the Section 232 duty under 9903.79.01 therefore does not apply. For background on the duty heading itself, see our companion article on 9903.79.01 and the Section 232 semiconductor tariff.

Scope: semiconductor articles and U.S. data centers defined

Semiconductor articles: subdivision (b) of U.S. note 39

The official heading text for 9903.79.03 limits the exemption to goods that qualify as "semiconductor articles, as defined in subdivision (b) of U.S. note 39 to this subchapter." The facts block for this code does not reproduce the full text of subdivision (b). You must read subdivision (b) in the current HTSUS at hts.usitc.gov to determine whether your specific product falls within that definition. Do not assume that every product that could colloquially be called a "semiconductor" or a "chip" satisfies the statutory definition.

U.S. data centers: subdivision (d) of U.S. note 39

The second condition is an end-use requirement. The semiconductor articles must be "for use in U.S. data centers, as defined in subdivision (d) of U.S. note 39 to this subchapter." Subdivision (d) sets out what CBP and the relevant authority consider a qualifying data center for purposes of this exemption. Confirm that definition in the current HTSUS text. An importer whose goods are semiconductor articles but are destined for a purpose other than a qualifying U.S. data center cannot claim 9903.79.03; those goods remain subject to 9903.79.01 unless another exclusion heading applies.

Both conditions, product scope and end-use, must be satisfied simultaneously. Meeting only one is not sufficient to claim the exemption.

Rate and duty mechanics

The HTSUS general column rate for 9903.79.03 is: the duty provided in the applicable subheading. This language is standard for exemption headings in Chapter 99. It means this heading adds zero to the duty bill. The importer pays whatever the column 1 general rate is under the Chapter 1-97 classification of the product, and the Section 232 semiconductor surcharge that would otherwise be owed under 9903.79.01 does not apply.

Because no additional duty attaches here, a correct claim of 9903.79.03 can represent a meaningful cost difference compared with entries that do not qualify. The magnitude of the savings depends on the rate under 9903.79.01 and the dutiable value of the shipment. Use the duty calculator to model the comparison for a specific entry.

How 9903.79.03 stacks with other tariff provisions

Claiming 9903.79.03 removes the Section 232 semiconductor surcharge. It does not remove or modify any other duties that may apply to the same goods. Importers must still pay:

• The standard column 1 general rate under the applicable Chapter 1-97 classification.
• Any Section 301 additional duties, if the goods originate in a country subject to those measures and no separate exclusion applies.
• Any other Chapter 99 duty that independently covers the goods.

In short, 9903.79.03 is a single-program relief provision. It operates within the Section 232 semiconductor framework only. Run a full stacking analysis for each shipment to account for all applicable Chapter 99 overlays. If you are uncertain whether additional provisions apply to your product and country of origin, confirm with a licensed customs broker or check the current HTSUS at hts.usitc.gov.

How the exemption appears on an entry

Chapter 99 codes are reported as secondary lines on a CBP entry. The importer or broker enters the Chapter 1-97 classification on the primary line, then adds 9903.79.03 as an additional line on the same entry. Both lines reference the same goods and the same dutiable value, but 9903.79.03 carries no additional duty amount. The effect is that ACE reflects the claimed exemption for audit and reconciliation purposes.

Documentation supporting the end-use condition is critical. Because subdivision (d) requires that the goods be "for use" in a U.S. data center, CBP may examine purchase orders, contracts, or other records establishing the intended destination and use at the time of importation. Maintain that documentation in the entry file for the full record-retention period. Our article on building a post-entry audit program explains how to structure those file reviews so that end-use claims are verifiable on demand.

If a claimed exemption is later found to be incorrect, for example because the goods were diverted from qualifying data center use, the importer may owe the Section 232 duty that was not collected at entry, along with interest. Confirm the correct classification and end-use documentation before filing. See our guidance on customs broker oversight as an importer duty for how reasonable care applies to these classification decisions.

What importers should do

1. Verify both definitions before filing. Pull the current text of U.S. note 39, subdivisions (b) and (d), from hts.usitc.gov and confirm your product meets the semiconductor article definition and that the end destination is a qualifying U.S. data center as the note defines it. The facts block for this code is current as of August 13, 2026, but the note text may be updated; always check the live schedule.
2. Build the end-use paper trail now. Gather purchase orders, contracts, or letters from the U.S. data center operator that establish the intended use at the time of importation. File that documentation with the entry record. Do not rely on post-importation documentation to reconstruct an end-use claim.
3. Run a full duty-stacking analysis. Confirm whether Section 301 or other Chapter 99 provisions also apply to your goods and country of origin. A correct 9903.79.03 claim eliminates only the Section 232 semiconductor surcharge under 9903.79.01; all other applicable duties remain.
4. Review past entries. If you have previously imported qualifying semiconductor articles for U.S. data center use without claiming 9903.79.03, assess whether a protest or post-summary correction is appropriate. Confirm timing and procedural requirements with your broker or attorney.

Key references

• Harmonized Tariff Schedule of the United States (HTSUS), hts.usitc.gov: The official schedule; includes Chapter 99, heading 9903.79.03, and the full text of U.S. note 39.
• U.S. Customs and Border Protection (CBP), cbp.gov: Entry filing guidance, CSMS messages, and ACE instructions for Chapter 99 overlay codes.
• Federal Register, federalregister.gov: Notices and rules related to the Section 232 semiconductor program.
• White House, whitehouse.gov: Presidential proclamations establishing and modifying Section 232 actions.
• 9903.79.01 Semiconductors 232 Tariff: Rate, Scope, and Stacking: The duty-bearing heading that 9903.79.03 exempts goods from.
• 2026 Tariff Code Overview, CustomsGenius: Reference guide to active Chapter 99 codes for 2026 entries.