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What are Section 232 tariffs?

US Section 232 tariffs are trade measures imposed for national-security reasons. They are authorized under Section 232 of the Trade Expansion Act of 1962.

The process generally works as follows:

1. The US Department of Commerce investigates whether imports of a product threaten to impair US national security.
2. Commerce submits its findings to the President.
3. The President decides whether to restrict the imports and what action to take.
4. US Customs and Border Protection (CBP) implements the action at entry.

The response may include an additional tariff, a tariff-rate quota, an absolute quota, or another import restriction. A Section 232 action is not automatically created whenever Commerce begins an investigation; the final measure depends on the applicable presidential action and implementing instructions.

For current measures and product coverage, see SkuWatch’s Section 232 hub.

Which products have historically been covered?

Section 232 measures have historically focused on:

• Steel products
• Aluminum products
• Certain steel and aluminum derivatives, such as specified downstream or fabricated goods

Coverage is determined by the legal product descriptions and Harmonized Tariff Schedule of the United States (HTSUS) provisions named in the relevant action. A product’s ordinary commercial description is not enough to determine whether it is covered.

Two products that appear similar may have different treatment because of differences in:

• Material composition
• Form or shape
• Processing
• Dimensions
• Product function
• Country of origin
• The precise HTSUS classification

Coverage can also change when the US adds, removes, or revises derivative products. Merchants should check the live HTSUS and applicable government instructions rather than rely on an older product list. You can search a product or HTS code or browse the HTS tree.

How Section 232 is reported through Chapter 99

Section 232 charges are generally implemented through special provisions in Chapter 99 of the HTSUS. These provisions are often called Chapter 99 tariff numbers or Section 232 provisions.

For an affected shipment, the entry may require:

• The ordinary HTSUS classification for the merchandise; and
• A separate Chapter 99 provision that identifies the Section 232 measure

The ordinary HTSUS provision describes what the product is. The Chapter 99 provision applies the additional trade measure. Both classifications must be selected accurately and reported in the required order and format.

The Chapter 99 provision may depend on factors such as:

• The product’s tariff classification
• Whether the product is steel, aluminum, or a derivative
• The product’s country of origin
• Whether the product is subject to a quota arrangement
• Whether an exclusion or other special treatment applies

A Chapter 99 provision is not a substitute for classifying the product under its ordinary HTSUS heading. Incorrect classification can lead to additional duty assessments, entry corrections, penalties, or shipment delays.

Country exemptions, quotas, and special arrangements

Section 232 treatment can differ by country. The United States has, at various times, applied arrangements that provide certain countries with:

• Exemption from an additional tariff
• A tariff-rate quota
• An absolute quota
• Alternative treatment for specified products
• Other conditions or reporting requirements

An exemption or quota is not necessarily a permanent country-wide exemption. It may apply only to:

• Particular products
• Particular countries of origin
• Merchandise entered during a specified period
• Volumes within an allocated quota
• Imports meeting documentation or eligibility conditions

A tariff-rate quota generally allows a specified quantity to enter under one treatment, with different treatment applying after the quota is filled. An absolute quota limits the quantity that may enter under the applicable rules.

Do not assume that the country where goods were shipped from is the country of origin. Origin is determined under US customs rules and can involve substantial transformation, processing, and product-specific analysis. Review measures by country of origin when evaluating country-specific treatment; the China page is an example of how origin-based measures are organized.

How Section 232 duties stack with other duties

A Section 232 charge is generally an additional trade measure. It may apply on top of the ordinary customs duty for the product.

Depending on the merchandise and current rules, an import may also involve:

• The normal or “most-favored-nation” (MFN) duty under the ordinary HTSUS provision
• Section 301 additional duties, where applicable
• Antidumping duties (AD)
• Countervailing duties (CVD)
• Other Chapter 99 measures
• Quota-related charges or restrictions
• Customs fees and other government charges

These measures do not all work the same way. For example, AD and CVD are administered under separate laws and may use different case-specific classifications, deposit instructions, and assessment methods. Some measures may be calculated on different customs-value bases or may be subject to special ordering rules.

Do not assume that one additional duty replaces another, or that all measures are simply added together. The correct result depends on the HTSUS provisions, the legal authority for each measure, the product’s origin, and the entry circumstances.

For comparison, see the Section 301 guide. You can also review all tracked measures and recent changes.

A practical review process for merchants

Before importing a product that may contain steel or aluminum, use this workflow:

1. Identify the product precisely. Record its materials, composition, dimensions, manufacturing process, and intended use.
2. Determine the US HTSUS classification. Use the HTSUS and, where necessary, seek a binding ruling or qualified customs advice.
3. Confirm the country of origin. Do not rely only on the shipping country or the location of the final sale.
4. Check Section 232 coverage. Look for the relevant Chapter 99 provisions and product descriptions.
5. Check country treatment. Determine whether an exemption, quota, or other arrangement applies.
6. Review exclusions and eligibility conditions. Product exclusions, if available, may require specific facts, documentation, or an approved exclusion process.
7. Check other measures. Review Section 301, AD/CVD, sanctions, and other applicable requirements.
8. Confirm current instructions before entry. Tariff provisions and enforcement instructions can change.

For a broader overview of customs and trade measures, visit the SkuWatch guides.

Common mistakes

Treating all metal products the same

Section 232 coverage is based on legal product descriptions and tariff provisions, not simply on whether an item contains some steel or aluminum. A product containing a small amount of metal may not be treated the same as a covered steel or aluminum article.

Using the wrong country of origin

The manufacturing location, export location, supplier location, and country of origin may be different. Incorrect origin can produce the wrong Chapter 99 provision and the wrong duty treatment.

Reporting only the ordinary HTSUS code

An affected entry may require both the ordinary HTSUS classification and a Chapter 99 provision. Reporting only the ordinary classification can result in an incomplete entry.

Assuming a quota or exemption is automatic

Special country treatment may have product, volume, timing, and documentation requirements. Confirm eligibility before shipment and monitor quota status where applicable.

Relying on an old tariff table

Section 232 coverage and implementation instructions can change. Always verify the live HTSUS, CBP instructions, presidential actions, and other official sources for current treatment and amounts.

Frequently asked questions

Is Section 232 a tariff on every steel or aluminum product?

No. Section 232 treatment depends on the specific product description, HTSUS classification, country of origin, and applicable Chapter 99 provision. Some derivatives may be covered, while other products containing steel or aluminum may not be.

Does Section 232 replace the normal customs duty?

Usually, it is an additional measure rather than a replacement for the ordinary HTSUS duty. Other duties may also apply, but the exact calculation and ordering depend on the applicable rules.

Can a country be exempt from Section 232?

A country may receive special treatment under a current arrangement, but the treatment may be limited to certain products, quantities, or conditions. Check the current official rules rather than assuming a country-wide exemption.

How can I determine whether my product is covered?

Start with the product’s precise specifications, US HTSUS classification, and country of origin. Then review the applicable Chapter 99 provisions and current official instructions. For complex products or uncertain classifications, obtain advice from a customs broker or trade attorney.

Reference information only, not customs, legal, or classification advice. Tariff rules change frequently; confirm against the official source before you act.