How to Find Your HTS Code

A Harmonized Tariff Schedule (HTS) code is a 10-digit number that precisely classifies a specific good for US import purposes. Every physical product imported into the United States must be classified under an HTS code. The code determines the MFN duty rate, Section 232 applicability, Section 301 list membership, and import licensing requirements. The HTS system is based on the international Harmonized System (HS), a 6-digit global classification system maintained by the World Customs Organization (WCO) and used by 200+ countries. The US extends the 6-digit international code with 4 additional digits for greater product specificity. The first 6 digits of a US HTS code are internationally standardized; the last 4 digits are US-specific. HTS code structure: the first 2 digits are the "chapter" (broad product category); digits 3-4 are the "heading" (more specific category); digits 5-6 are the "subheading" (specific product type); digits 7-8 are the "US duty rate subheading"; digits 9-10 are the "statistical suffix" used for trade data purposes. Tariff rates and Section 301 applicability are determined at the 8-digit level; the 9-10 digit suffix is for reporting only. Example: HTS 8517.12.0050 — Chapter 85 (electrical machinery and equipment), Heading 8517 (telephone sets), Subheading 8517.12 (smartphones), 8-digit 8517.12.00 (smartphones, parts and accessories), 10-digit 8517.12.0050 (statistical suffix for specific smartphone type). This code has a 0% MFN rate but is subject to Section 301 List 3 (25%) for goods from China.

The official source for HTS codes is the USITC (United States International Trade Commission) interactive tariff database at hts.usitc.gov. The Schedule B search tool at Census.gov/trade (primarily for exports but shares the 6-digit base with imports) is also useful. CBP's ACE (Automated Commercial Environment) system displays binding rulings at rulings.cbp.gov. Start your search at hts.usitc.gov. The interface allows searching by product description or browsing the chapter structure. For consumer goods, search the product name (e.g., "wireless earbuds") and the system will suggest relevant classifications. Review the chapter notes and section notes, which legally define the scope of each classification and take precedence over the product description. The chapter notes are legally binding. If a product could potentially be classified in multiple chapters (a common issue for multifunctional products), the chapter notes specify which classification controls. General Rule of Interpretation (GRI) 1 requires classification according to the terms of the heading — a product that is specifically described in a heading falls there, regardless of where a related product might be classified. Chapter notes can create surprising classifications. Safety footwear with a steel toe might seem classifiable as footwear (Chapter 64) or as steel goods (Chapter 72). Chapter 64 notes specify that footwear is classified as footwear regardless of the materials in its construction. The steel toe does not make it a "steel article" subject to Section 232. For products you import regularly, invest in obtaining a binding ruling from CBP (rulings.cbp.gov). A binding ruling takes 30-60 days and is legally enforceable — CBP cannot reclassify your product in an audit if you have a valid binding ruling.

Classification errors are the most common cause of CBP audit findings. The five most frequent mistakes: Mistake 1: Using the wrong chapter note. Chapter notes legally define chapter scope. Many importers classify goods based on the heading description without reading the applicable chapter notes, leading to systematic errors. Example: Articles of apparel made from technical textiles (radiation-shielding, temperature-regulating) sometimes get misclassified in Chapter 39 (plastics) rather than Chapter 61-62 (apparel) where the chapter notes place textile garments regardless of technical properties. Mistake 2: Classifying by material rather than by article. The GRI hierarchy generally favors the "article" classification over the "material" classification. A plastic toy is classified as a toy (Chapter 95), not as an article of plastics (Chapter 39), even though plastics describes the material. This matters because Chapter 95 toy rates differ from Chapter 39 plastics rates. Mistake 3: Mixing up complete and incomplete goods. GRI 2(a) states that a heading for a complete good includes the complete but unassembled article, and also the incomplete article if it has the essential character of the complete good. A knocked-down bicycle (unassembled parts) is classified as a bicycle (8712), not as bicycle parts (8714). Some importers intentionally import in unassembled form hoping for lower part rates — CBP specifically targets this. Mistake 4: Ignoring the preferential vs. MFN distinction. Some goods have lower MFN duty rates than preferential rates under specific programs (unusual but it occurs). Always verify the effective rate, not just the MFN column. Mistake 5: Applying the wrong country of origin. Country of origin is determined by where the good was substantially transformed, not where it was shipped from. A Chinese-made product assembled in Vietnam with minimal processing is still Chinese-origin for tariff purposes.

The HTS code is the mechanism through which Section 232 and Section 301 applicability is determined. Neither Section 232 nor Section 301 applies to all goods — they apply to specific HTS chapters and subheadings. Section 232 steel coverage: HTS Chapters 72 and 73. Chapter 72 covers iron and steel mill products (pig iron, ferro-alloys, ferro-silicon, iron and steel in primary forms, flat-rolled products, bars and rods, wire, angles and shapes). Chapter 73 covers articles of iron or steel (tubes, pipes, fittings, chains, nails, screws, springs, stoves, stainless steel kitchen equipment). A finished stainless steel kitchen cabinet from China (HTS Chapter 73) is an "article of steel" subject to S232. The same cabinet might also have S301 applicability, but it is first and foremost S232-covered. Section 301 list membership is determined by HTS subheadings at the 8-digit level. The USTR published specific exclusion lists keyed to 8-digit HTS codes. To determine your Section 301 list membership and rate, cross-reference your 8-digit HTS code against the four USTR annexes. The CalcMyTariff.com HTS lookup provides this automatically. Section 232 semiconductors (HTS 8541 and 8542 subheadings): not all 8541 and 8542 goods are Section 232-covered. The January 2026 proclamation targeted narrowly defined advanced semiconductor articles. You must verify your specific 8-digit subheading against the proclamation annex. Pharmaceutical products have Section 122 exemptions tied to specific HTS chapters (Chapter 30 pharmaceutical products, and certain precursors in Chapter 29 organic chemicals). If you import pharma or pharma inputs, verify your HTS chapter against the S122 exemption list.

Once you have your 10-digit HTS code, you can use it to look up your exact tariff obligations. The CalcMyTariff.com HTS lookup tool covers the top 500 HTS codes and automatically displays the applicable MFN rate, Section 232 coverage, and Section 301 list membership. For any HTS code you enter, the tool shows: the standard MFN duty rate (the baseline rate for most countries), whether Section 232 applies and at what rate, whether Section 301 List 1, 2, 3, or 4A applies and the current rate, and country-specific effective rates for the 20 highest-traffic sourcing countries. The CalcMyTariff.com landed cost calculator accepts a manual MFN rate entry if your specific HTS code is not in the top 500. Enter the rate from hts.usitc.gov directly, then select your sourcing country, Section 232 status, and Section 301 list membership to get the full stacked rate. This approach handles unusual HTS codes that are not in the lookup table. For importers who regularly source from China, the effective calculation at the 8-digit level is: verify your HTS code at hts.usitc.gov — identify MFN rate — check USTR annex for Section 301 list membership and rate — determine whether your 8-digit subheading falls under Section 232 coverage — confirm that Section 232 status means you are exempt from Section 122 stacking. This sequence produces the accurate total tariff obligation for China-origin goods. Documentation best practices: keep a record of the HTS codes assigned to each of your products, the source (hts.usitc.gov lookup or binding ruling), the MFN rate, any Section 301 list membership, and whether Section 232 applies. This record is the foundation of your landed cost calculations and customs documentation. Updated annually, it ensures you respond quickly when tariff rates change — which in 2026 has been more frequent than any year since World War II.