9903.05.94: Mexico Exemption from Section 301 Forced Labor Duties

Key Points

• HTS 9903.05.94 is an exemption heading, not a duty: it removes or reduces the Section 301 forced labor duty for qualifying articles that are the product of Mexico.
• Eligibility is governed by subdivision (h) of U.S. Note 52 to Chapter 99 of the HTSUS; importers must satisfy every condition in that note to claim the heading.
• The rate shown in the HTSUS general column for 9903.05.94 is "the duty provided in the applicable subheading," meaning the underlying Chapter 1-97 rate applies, not an additional surcharge.
• This heading rides alongside a standard Chapter 1-97 classification line on the entry; it does not replace it.
• Facts in this article are current as of September 21, 2026; confirm active applicability in the current HTSUS or with your broker before filing.

On this page

1. What HTS 9903.05.94 is and who needs to care
2. The Section 301 forced labor duty framework
3. Product and country scope: articles the product of Mexico
4. Subdivision (h) of U.S. Note 52: what the eligibility conditions mean
5. Rate and stacking with other duties
6. How 9903.05.94 appears on a customs entry
7. What importers should do
8. Key references

HTS 9903.05.94 is a Chapter 99 claim heading that exempts certain Mexican-origin articles from the additional duties imposed under the Section 301 forced labor program. Importers of goods produced in Mexico that would otherwise be subject to those Section 301 forced labor duties should evaluate whether their merchandise qualifies under subdivision (h) of U.S. Note 52 to the subchapter. When correctly claimed, 9903.05.94 means no additional forced labor duty is assessed; only the ordinary Chapter 1-97 rate applies.

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 HTS 9903.05.94 is and who needs to care

Chapter 99 of the Harmonized Tariff Schedule of the United States is reserved for temporary and special-purpose provisions. Codes in the 9903.05.85-and-onward block, and in the 9903.06 block, are exemption and exception headings within the Section 301 forced labor program. They do not impose duties; they relieve them.

9903.05.94 specifically covers "Articles the product of Mexico, as provided for in subdivision (h) of U.S. note 52 to this subchapter." If you import goods from Mexico that fall under the Section 301 forced labor duty umbrella, this heading is your formal mechanism to claim the exemption on the entry. Customs brokers building the entry summary and trade attorneys advising on classification should both be aware of this heading's function.

For context on the broader family of Section 301 forced labor exemption headings, see our related coverage: 9903.05.90: Section 301 Forced Labor Exemption Explained and 9903.05.91: Humanitarian Donations Exemption from Section 301 Forced Labor Duties.

The Section 301 forced labor duty framework

The United States Trade Representative (USTR) has used Section 301 authority to impose additional duties on imports linked to forced labor practices. Within that program, Congress and the Executive Branch have carved out specific exemption categories for goods that meet defined criteria. These exemptions are codified in Chapter 99 as discrete heading numbers, each tied to a particular U.S. note subdivision.

The 9903.05.85 series of headings represents those exemptions. Rather than paying the additional Section 301 forced labor duty, an importer who qualifies under the relevant note subdivision claims the appropriate exemption heading on their entry. The practical result is that only the standard tariff rate from the applicable Chapter 1-97 subheading is assessed.

Separately, importers dealing with forced labor allegations at the border should also understand the UFLPA rebuttable presumption and how it interacts with customs entry procedures.

Product and country scope: articles the product of Mexico

The geographic scope of 9903.05.94 is explicit and narrow: the goods must be "the product of Mexico." Country of origin for customs purposes follows CBP's substantial transformation or, for certain goods, tariff-shift rules. An article assembled in a third country from Mexican components, or merely transshipped through Mexico, does not automatically qualify as a product of Mexico.

Importers should document country-of-origin determinations carefully. If CBP questions the Mexican origin of goods entered under 9903.05.94 and the claim fails, the underlying Section 301 forced labor duty would be assessed, potentially with interest. Thorough origin records are essential.

The product scope beyond the country requirement is defined by subdivision (h) of U.S. Note 52. The facts block for this article does not reproduce the full text of that note; confirm the current, complete text at hts.usitc.gov before filing any entry under this heading.

Subdivision (h) of U.S. Note 52: what the eligibility conditions mean

U.S. notes to Chapter 99 are legally operative. Subdivision (h) of U.S. Note 52 sets out the specific conditions that an article the product of Mexico must satisfy to qualify for the 9903.05.94 exemption. The HTSUS does not embed those conditions in the heading text itself; the note is the controlling legal standard.

Because the facts block for this article does not reproduce the full substantive text of subdivision (h), importers and brokers must read the note directly in the current HTSUS at hts.usitc.gov. Do not rely on summaries. The conditions may include product-type limitations, end-use requirements, certifications, or other criteria that change the analysis for any given shipment.

If there is any ambiguity about whether a specific product meets the subdivision (h) conditions, request a binding ruling from CBP before the goods arrive. Binding rulings are available through cbp.gov.

Rate and stacking with other duties

Rate under 9903.05.94

The HTSUS general column rate for 9903.05.94 is "the duty provided in the applicable subheading." This language is the standard formulation for an exemption or pass-through heading: it means the heading itself imposes no duty. The importer pays whatever rate is assigned to the underlying Chapter 1-97 classification, and that is all.

Interaction with USMCA and other preference programs

If the Mexican-origin goods also qualify for preferential treatment under the United States-Mexico-Canada Agreement (USMCA), that preference would apply to the Chapter 1-97 rate in the normal way. The exemption heading 9903.05.94 addresses the Section 301 forced labor additional duty layer; it does not affect USMCA eligibility one way or the other. The facts block is silent on how other Chapter 99 special tariff provisions interact with 9903.05.94, so confirm the full stacking picture with your broker or at hts.usitc.gov.

Other Section 301 tranches

Section 301 encompasses multiple distinct tranches targeting different countries and product groups. The forced labor tranche is one component. 9903.05.94 addresses only the forced labor additional duty for qualifying Mexican-origin goods. It does not provide relief from any other Section 301 tranche that may also apply to a given product. Check all applicable Chapter 99 provisions for any given entry.

How 9903.05.94 appears on a customs entry

On a CBP Form 7501 entry summary, a Chapter 99 exemption heading is entered as a separate line alongside the standard Chapter 1-97 classification. Both lines reference the same merchandise, but they serve different legal functions. The Chapter 1-97 line establishes the base classification and rate; the 9903.05.94 line signals to CBP that the importer is claiming the Section 301 forced labor exemption for that merchandise.

Failing to include the 9903.05.94 line when the goods qualify means the exemption is not on the record, and CBP will assess the Section 301 forced labor duty at liquidation. Correcting that after the fact requires a post-summary correction or a protest. For the protest process, see CBP Protest 19 USC 1514: Challenging Liquidation Decisions.

Entry data accuracy matters. Teams using AI-assisted entry review can find relevant context in What Does an AI Audit of ACE Entry Data Actually Produce?

What importers should do

• Read subdivision (h) of U.S. Note 52 in the current HTSUS at hts.usitc.gov and confirm your merchandise meets every stated condition before claiming 9903.05.94 on any entry.
• Document your Mexican country-of-origin determination with manufacturer affidavits, bills of material, or other substantive evidence that can withstand a CBP inquiry.
• Ensure your entry summary includes 9903.05.94 as a separate Chapter 99 line alongside the Chapter 1-97 classification; work with your broker to verify the line appears correctly before filing.
• If you have entries that were liquidated without the exemption claim and the window to protest is open, evaluate whether a protest under 19 USC 1514 is appropriate given the facts of your shipment.

Key references

• Harmonized Tariff Schedule of the United States (USITC): The official, continuously updated HTSUS, including Chapter 99 and U.S. Note 52 in full.
• U.S. Customs and Border Protection (CBP): CBP guidance, CSMS messages, binding ruling requests, and entry instructions.
• Federal Register: USTR and CBP notices establishing and modifying Section 301 forced labor duty provisions.
• White House: Presidential proclamations and executive orders relevant to Section 301 trade actions.
• 9903.05.85 Section 301 Forced Labor Transit Exemption Explained: Coverage of the first heading in this exemption series.
• 9903.05.90: Section 301 Forced Labor Exemption Explained: Related exemption heading analysis.
• CBP Protest 19 USC 1514: Challenging Liquidation Decisions: How to contest a duty assessment after liquidation.
• UFLPA Rebuttable Presumption: How to Overcome It at CBP: Forced labor presumption rebuttal procedures at CBP.
• 2026 Tariff Code Overview: CustomsGenius reference page for 2026 Chapter 99 and related tariff codes.