Complete Guide to HTS Classification for US Importers (2026)

What Is the HTS and Why Does It Matter?

The Harmonized Tariff Schedule of the United States (HTSUS) is the official product classification system used by US Customs and Border Protection (CBP) to determine import duties, track trade statistics, and enforce partner agency requirements from the FDA, USDA, and EPA.

Every product entering the United States must be assigned an HTS code. That code determines:

• The duty rate — base MFN rate plus any applicable Section 301, 232, or antidumping/countervailing duty overlays
• Partner agency requirements — FDA import alerts, USDA permits, EPA certifications, and Consumer Product Safety Commission (CPSC) thresholds are all triggered by HTS code
• Trade agreement eligibility — USMCA, FTAs, and GSP duty reductions are code-specific
• Quota and import license requirements — certain textiles, dairy, and sugar products have quota controls keyed to HTS codes

The USITC publishes and maintains the HTSUS as mandated by Congress, but CBP is the sole authority authorized to interpret the HTS and issue binding rulings. The USITC's role is maintenance; CBP's role is enforcement.

The 10-Digit HTSUS Code Structure

A complete US HTS code is 10 digits long, with each segment serving a distinct purpose. The first six digits are harmonized internationally; the final four are US-specific.

Breaking Down the Digits

• Digits 1–4 (Heading): The product category. Identical worldwide. Used for broad classification and determines which section notes and chapter notes apply.
• Digits 5–6 (Subheading): Narrows to material composition, processing stage, or primary function. Still harmonized globally — a French importer uses the same 6-digit code.
• Digits 7–8 (US Rate Line): The level at which duty rates are published. This is where base MFN rates, Special rates (FTA countries), and the Column 2 rate (non-NTR countries) appear.
• Digits 9–10 (Statistical Suffix): Required for entry filing. Used by the Census Bureau for trade statistics. Does not affect duty rate, but incorrect reporting can trigger a CF-28 request for information.

The 6 General Rules of Interpretation (GRI)

The GRI are the legally binding rules for HTS classification, published directly in the HTSUS. They are applied in strict sequence — you cannot skip to GRI 3 without exhausting GRI 1 and 2 first. The GRI are harmonized internationally, meaning CBP applies the same rules as customs authorities in the EU, Japan, and China.

Step-by-Step: How to Classify a Product

Most misclassifications happen because importers start with a vendor's code or use keyword searches without applying the GRI methodically. Follow this process for defensible classifications.

1. 1
   Document the product fully

   Gather the commercial invoice description, bill of materials, product photos, technical specifications, country of origin, and end use. The more specific your product documentation, the more defensible your classification. Ambiguous descriptions are the #1 trigger for CBP CF-28 requests.
2. 2
   Identify the relevant HTS Chapter

   The 22 Sections and 99 Chapters of the HTSUS are organized primarily by material composition (Sections I–X cover natural materials) and then by processing/function (Sections XI–XXI cover manufactured goods). Read the Section and Chapter notes before looking at individual headings — notes define what is and isn't included.
3. 3
   Apply GRI 1: check heading descriptions and notes

   Read heading descriptions in your candidate chapter. Check Section notes, Chapter notes, and any Additional US Notes in that chapter — these notes often exclude specific products from headings that would otherwise seem to fit.
4. 4
   Search the CROSS database for similar products

   CBP's Customs Rulings Online Search System (CROSS) at rulings.cbp.gov contains hundreds of thousands of published binding rulings. Search by product description, HTS heading, or keyword. A ruling on a similar product (similar material, function, construction) is strong support for your classification — reference the ruling number in your entry documentation.
5. 5
   Verify at the 8-digit (rate line) level

   Once you've identified the heading, apply GRI 6 to drill down to the 8-digit rate line. This is where duty rates are published. Check the General, Special (FTA), and Column 2 columns. Also note any Chapter 99 HTSUS provisions — this is where Section 232, Section 301, and other overlay duties are coded for 2025–2026.
6. 6
   Document your classification rationale

   Maintain a written classification memo for each product: the GRI analysis, CROSS rulings referenced, any broker confirmation, and the effective date. If CBP audits an entry, your documentation is the difference between a warning and a penalty.

CBP Binding Rulings and the CROSS Database

A binding ruling is a written decision from CBP that establishes the classification (and valuation or origin treatment, if requested) for a specific product before it enters the US. Binding rulings are legally enforceable — both CBP and the importer are bound by the ruling as long as the product and its circumstances remain unchanged.

When to request a binding ruling

• Your product has significant annual duty exposure (even 1–2% on $1M+ in imports is worth getting right)
• You've identified two or more plausible headings and can't resolve the conflict with GRI
• The product is a composite good, set, or incomplete article where GRI 2–3 is required
• You're importing a newly developed product with no CROSS precedent
• Your product may be covered by Section 301 or AD/CVD orders and you need certainty on scope

How to file an eRuling request

File electronically through erulings.cbp.gov. CBP's standard processing time is 30 business days, though complex technical products can take longer. To prepare a strong ruling request:

• Include product photos, bill of materials, technical specs, and supplier declarations
• Describe the product's function, construction materials, and end use
• Propose the specific HTS headings you believe are applicable and explain your GRI reasoning
• Attach any test reports or industry standards documentation

HTS Changes to Know for 2026

The USITC published multiple HTS change records throughout 2025 and into 2026. Importers with large SKU catalogs need to audit affected codes before filing entries. Key areas of change include:

• Chapter 85 (Electrical machinery and equipment): Semiconductors and solar cells saw subheading revisions following Biden-era Section 301 rate increases effective January 1, 2026. Some 8-digit rate lines were split to create separate rate lines for targeted products.
• Chapter 90 (Medical instruments): Medical gloves and respirators were restructured to implement the phased Section 301 increases — medical gloves now carry a 100% Section 301 rate in List 4 under Chapter 99.
• Chapter 99 overlay codes: This is where all Section 232, Section 301, and Section 122 additional duties are applied. Chapter 99 saw significant changes as the Trump administration implemented new tariff actions in 2025–2026. Review Chapter 99 codes for any product importing from China, steel/aluminum products, and automobiles.
• USITC HTS change files: Subscribe to automated notifications at usitc.gov to receive CSV/XLS change records. Import these into your classification system and flag any SKU whose current 8-digit code appears in the change record.

Penalties for Misclassification

CBP enforces classification accuracy under 19 USC §1592, the primary statute for customs fraud and negligence. Penalties are tiered by culpability level:

• Negligence: Up to 4x the unpaid duties (or the domestic value of the merchandise for duty-free goods). The benchmark for negligence is failure to exercise reasonable care.
• Gross Negligence: Up to 4x unpaid duties plus the full unpaid duty amount. CBP can assess gross negligence for a pattern of negligent misclassifications or for ignoring known classification issues.
• Fraud: Up to 4x the domestic value of the merchandise. Applies when misclassification is intentional — for example, knowingly using a lower-duty code to avoid Section 301 tariffs.

Prior Disclosure

If you discover a historic misclassification, prior disclosure to CBP under 19 USC §1592(c)(4) significantly reduces penalty exposure — typically to the unpaid duties plus interest, rather than multiples thereof. Prior disclosure must be made before CBP initiates a formal investigation. Consult a licensed customs attorney before filing.

The Reasonable Care Standard

Under 19 USC §1484, the importer of record is legally responsible for using reasonable care in determining the correct classification, valuation, and admissibility of imported goods. CBP does not define "reasonable care" by formula, but published Informed Compliance Publications (ICPs) and enforcement actions provide substantial guidance.

In practice, demonstrating reasonable care means:

• Maintaining a written classification policy with a designated classification owner
• Documenting the GRI analysis and CROSS rulings reviewed for each product classification
• Reviewing classifications annually and after any HTS change record affecting your codes
• Obtaining binding rulings for high-value, ambiguous, or novel products
• Working with a licensed customs broker or trade attorney for complex classifications
• Requesting a non-binding technical advice from CBP's trade experts when uncertain