Harmonized Tariff Schedule (HTS)

The Harmonized Tariff Schedule of the United States (HTSUS) is the legal classification system that determines the duty rate for every single product imported into the United States. Published by the U.S. International Trade Commission (ITC) and maintained under 19 U.S.C. § 1202, the HTSUS assigns every importable good a 10-digit code that dictates the applicable tariff rate — ranging from 0% (duty-free) to over 300% for goods subject to antidumping orders, Section 301 China tariffs, or Section 232 national security duties stacked on top of the base rate. With approximately 17,000+ tariff line items, the HTS covers everything from fresh tomatoes (0702) to spacecraft (8802). The U.S. system is built on the international Harmonized Commodity Description and Coding System (HS), an international standard maintained by the World Customs Organization (WCO) and used by over 200 countries — the first six digits are internationally standardized, while digits 7–10 are U.S.-specific subdivisions for statistical and duty-rate purposes. Correct classification is one of the most consequential decisions an importer makes: a single digit difference in HTS code can mean a 0% duty rate or a 25% rate, and CBP has authority to collect underpaid duties (plus interest and penalties) for up to five years after entry. Antidumping and countervailing duties are layered on top of HTS base rates at the 10-digit subheading level.

Current Law (2026)

Legal Authority

• 19 U.S.C. § 1202 — Harmonized Tariff Schedule as law: the HTSUS has the force of statute; the General Rules of Interpretation (GRI) govern how goods are classified when not explicitly described; the HTSUS's legal text takes precedence over its explanatory notes for classification purposes
• 19 U.S.C. § 3001 — Congressional authorization for HTS: Congress authorized the U.S. to implement the international Harmonized System by adopting the HTSUS, replacing the prior Tariff Schedules of the United States (TSUS) effective January 1, 1989
• 19 U.S.C. § 3005 — Presidential proclamation authority: the President may proclaim modifications to the HTSUS to implement trade agreements, adjust duty rates within statutory limits, and conform U.S. nomenclature to international HS revisions
• 19 U.S.C. § 3007 — ITC maintenance: the ITC is responsible for keeping the HTSUS current, recommending modifications, and publishing the schedule; CBP issues binding ruling letters interpreting classification for specific products
• 19 U.S.C. § 1484 — Entry obligation: every importer must classify goods under the HTSUS at entry; incorrect classification is the importer's legal liability, not the broker's (though brokers bear professional responsibility)
• 19 U.S.C. § 1500 — CBP liquidation authority: CBP classifies, appraises, and liquidates entries; if CBP disagrees with the importer's classification, it can reliquidate and collect additional duties

How It Works

The HTS is a hierarchical legal document. Every imported product must be assigned a 10-digit code at entry, and the code determines the duty rate.

The HTSUS is organized into 22 Sections (broad categories like "Vegetable Products," "Machinery and Mechanical Appliances," "Vehicles") and 99 chapters within those sections. Within chapters, goods are broken into 4-digit headings, 6-digit subheadings (internationally standardized under the WCO Harmonized System), and 8- and 10-digit U.S. statistical subheadings — the 10-digit code is what importers declare on entry documents and what determines the duty rate. When a product isn't squarely described by a single heading, the General Rules of Interpretation (GRI) provide a tiebreaker hierarchy under 19 U.S.C. § 1202: classify by the specific text of the heading first; if not, classify incomplete or unfinished goods as the finished good; if classifiable under multiple headings, use the most specific description; if still tied, classify with the heading for the material giving the good its essential character; use the later-numbered heading as a last resort. The HTSUS has two general rate columns: Column 1 (MFN/NTR) rates — applying to goods from all WTO members — and Column 2 rates established by the Smoot-Hawley tariff (1930) that apply only to non-MFN countries (currently Cuba and North Korea) and can exceed 100%. Goods from preferential trade agreement partners (USMCA, bilateral FTAs) receive special reduced rates.

The practical complexity of the HTSUS has multiplied in recent years as additional duty layers stack on top of base Column 1 rates: Section 301 additional duties (25%, 50%, or 100% depending on list number), Section 232 steel/aluminum duties (25%/10%), antidumping and countervailing duty orders (variable), and IEEPA-based tariffs added by presidential proclamation. For a Chinese-origin solar panel, an importer may owe the 0% MFN base rate plus 25% Section 301, plus an additional 50% Section 301 on solar cells, plus antidumping duties of 50–250%, plus countervailing duties of 10–30% — potentially exceeding the product's value; CBP's Automated Commercial Environment (ACE) calculates total duty owed. An importer uncertain about the correct classification can request a binding ruling from CBP before importing: CBP will issue a written ruling that is legally binding on both CBP and the importer, published in CBP's CROSS database at rulings.cbp.gov for other importers facing similar questions. Binding rulings are free, typically take 30 days, and eliminate classification risk entirely — particularly valuable when the duty rate difference between competing classifications exceeds $10,000–$20,000 annually.

How It Affects You

If you are an importer who needs to classify goods for the first time: The starting point is hts.usitc.gov — the ITC's official HTSUS database, searchable by product description or code. Search for the most specific description that matches your product and work your way up the GRI hierarchy. A licensed customs broker knows the classification landscape for common commodity categories and the chapters where CBP scrutinizes most heavily (Chapter 84–90 machinery and electronics, Chapter 61–62 apparel, Chapter 87 vehicles). For any product where the duty rate difference between competing classifications exceeds $10,000–$20,000 annually, consider requesting a CBP binding ruling (CBP Form 6466) — it's free, typically takes 30 days, and eliminates your classification risk entirely. If you've been importing under a code you're now unsure about, file a prior disclosure to CBP before an audit begins: underpaid duties plus interest, but avoiding fraud penalties.

If you are a business restructuring supply chains to reduce tariff costs: HTS classification is where the supply chain arbitrage opportunities begin. Moving final assembly from China to Vietnam doesn't automatically reduce your duty rate — CBP applies "substantial transformation" rules to determine country of origin, and the test varies by product category. For some goods, final assembly in Vietnam makes the product Vietnamese-origin; for others, only manufacturing the core component qualifies. Before restructuring, get a ruling or trade counsel opinion on whether the manufacturing steps you're proposing will actually change the origin determination. Similarly, the 10-digit HTS code itself matters: the same physical product described differently (a "machine that happens to also brew coffee" vs. "a coffee brewing machine") can fall under completely different chapters with very different tariff exposure. Classification planning — legally describing products in the most favorable accurate code — is a legitimate tax minimization strategy.

If you are a U.S. manufacturer competing against imports: The HTS is also the mechanism through which protection reaches you. AD/CVD orders reference specific HTS codes — knowing whether the products injuring your industry are covered by an existing order requires HTS analysis. If you're petitioning for a new AD/CVD order, the scope of the order is defined in part by HTS codes. If you believe importers are misclassifying goods to escape an AD/CVD order (circumvention), CBP's EAPA process accepts allegations and can reclassify the goods. The scope of Section 301 tariff lists is also defined by HTS codes — lobbying for coverage or exclusion of specific codes is a major Washington trade policy activity.

If you are a customs broker or trade attorney managing classification disputes: CBP disputes are appealed through CBP protest (19 U.S.C. § 1514) within 180 days of liquidation, then to the Court of International Trade (CIT) on de novo review (the CIT is not bound by CBP's classification). CIT decisions are appealed to the Court of Appeals for the Federal Circuit. The evidentiary universe for classification cases includes: the HTS text, the Explanatory Notes to the international HS (persuasive but not binding), CBP's General Notices, and published rulings. Expert testimony on what a product "is" in commercial usage can sway a court.

State Variations

HTS classification and tariff obligations are exclusively federal — no state variations.

Implementing Regulations

• 19 CFR Part 0 — Authority and delegation

• 19 CFR Part 141 — Entry of merchandise (classification obligations, importer of record)

• 19 CFR Part 152 — Classification and appraisement of merchandise (CBP classification procedures)

• 19 CFR Part 177 — Customs rulings (binding ruling requests and letters; available at CBP's CROSS database at rulings.cbp.gov)

• 19 CFR Part 132 — Quotas: the CBP implementing regulations for import quotas — statutory or proclaimed limits on the quantity or value of certain goods that may enter the United States in a given period. Two types operate simultaneously:

  • § 132.1(a) — Absolute (quantitative) quotas: a hard ceiling on the quantity of a commodity that may enter the country in a given quota period; once the quota is filled, no further entries are permitted for that commodity until the next quota period opens; absolute quotas are used for politically sensitive agricultural products (butter, peanuts, certain dairy, sugar) and some manufactured goods; they are the bluntest trade instrument — beyond the limit, the product is simply barred regardless of price
  • § 132.1(b) — Tariff-rate quotas (TRQs): a two-tier tariff structure where a quantity of goods may enter at a lower (in-quota) tariff rate; once that quantity is reached, additional imports are permitted but at a higher (over-quota) tariff rate; TRQs are the dominant structure for many agricultural imports, typically negotiated as part of FTAs or WTO commitments; the HTS notation for TRQ products typically shows two rates — "0.35¢/kg" (in-quota) and "6¢/kg" (over-quota) — in the same subheading
  • § 132.11 — Quota priority: quota priority is determined by the time of presentation of the entry summary to CBP — earlier entries have priority; when a quota is about to fill, all entries presented simultaneously (on the same day) are treated as presented at the same time and receive a pro-rata share; CBP posts current quota status (open, close, near fill) through the ACE Quota module
  • § 132.12 — Potentially filled quotas: when CBP anticipates a quota will fill at opening (common for popular in-quota commodities at the start of a quota year), all entry summaries presented on opening day are held and receive pro-rata allocations; this prevents the fastest submitter from capturing the entire year's quota in the first minutes
  • § 132.14 — Quota bonds: imported merchandise subject to an absolute quota that has been filled cannot be warehoused pending the next quota period unless the importer posts a CBP bond guaranteeing payment of applicable duties or export/destruction of the merchandise if the next period's quota is also filled; this bond requirement prevents quota-filling merchandise from sitting indefinitely in bonded warehouses

  Quota administration has significant practical consequences for commodity traders and food importers: a TRQ "fill" — when the in-quota quantity runs out for the year — means that every subsequent import of that commodity faces the over-quota rate, which may be 5-10× the in-quota rate; importers with commodity exposure monitor CBP quota fill levels daily through the ACE system at cbp.gov. Sugar quotas, dairy quotas (under WTO TRQ commitments and USMCA), and cotton quotas are among the most actively monitored. The Trump administration's 2025 tariff escalation has created friction with existing TRQ commitments negotiated under FTAs and WTO bindings — goods entering under a TRQ in-quota rate may still face Section 232 or IEEPA additional tariffs layered on top.

Pending Legislation

• HR 6888 — Trump Tariff Transparency Act: Would require BEA and SBA to report quarterly on tariff costs to consumers and small businesses (by HTS code impact).
• Various Section 301 tariff exclusion requests continue to be processed through USTR — product-specific exclusions from China tariffs are identified by HTS subheading.
• De minimis reform legislation (multiple bills) would modify duty-free treatment for low-value imports, potentially requiring formal HTS entry for goods from specific countries.

Recent Developments

• The 2025–2026 tariff escalation under Section 232 and IEEPA dramatically increased the practical importance of HTS classification — the same physical product from different countries faced duty rates differing by 100+ percentage points based on origin, making origin and classification disputes a major enforcement focus
• February 20, 2026 — Learning Resources, Inc. v. Trump, 607 U.S. ___: the Supreme Court held 6-3 (Roberts, C.J.) that IEEPA does not authorize tariffs, vacating the IEEPA-based reciprocal tariffs (E.O. 14257) that had been layered onto HTSUS rates. Section 232 and Section 301 duty layers were unaffected; HTS classification analysis remains essential for those continuing programs and for AD/CVD orders
• CBP has increased enforcement scrutiny of HTS classification for solar panels, steel products, and electronics in connection with antidumping and Section 301 evasion investigations
• The ITC's annual HTSUS statistical revision effective January 2026 updated dozens of tariff line items to track new technology products (EVs, semiconductor components, advanced manufacturing equipment)
• USTR completed a comprehensive Section 301 four-year review in 2024, maintaining most tariff rates and increasing rates on strategic product categories including EVs (to 100%), solar cells (to 50%), batteries (to 25%), and semiconductors (to 50%), all defined by specific HTSUS subheadings