An HTSUS number is the 10-digit code from the Harmonized Tariff Schedule of the United States that classifies an imported product and determines the duty rate charged at the border. There are roughly 19,000 of these codes, and every product entering the country gets one. Pick the wrong one and you can overpay by thousands of dollars, or trigger civil penalties that reach the full domestic value of the goods.
What the 10 Digits Mean
The number is built in layers, and each layer does a specific job.
- Digits 1–2 identify the chapter, the broadest product category. Chapter 84 covers machinery; Chapter 61 covers knitted apparel.
- Digits 3–4 give the heading, a narrower group within the chapter.
- Digits 5–6 form the international subheading. These first six digits are the Harmonized System code shared by more than 200 countries, so a laptop shipped from Germany to Japan to the United States carries the same six-digit code at each stop.1International Trade Administration. An Overview of Harmonized System Codes
- Digits 7–8 are the U.S. subheading. This is the level at which the legal classification ends and the duty rate is assigned.
- Digits 9–10 are the statistical suffix. They do not change the duty rate; they let the government track trade flows at a finer level. If no statistical breakdown exists, the last two digits are simply zeroes.
Your duty rate is locked in at the 8-digit level, but the full 10-digit number is what you report when filing an entry.2U.S. International Trade Commission. Frequently Asked Questions about Tariff Classification
The Duty Rate Columns
Look up your 8-digit subheading and you’ll see several rates, not one. Which applies depends on where the goods were made.
- Column 1, General: the rate for goods from countries with Normal Trade Relations status. This covers the vast majority of U.S. trading partners.
- Column 1, Special: reduced or duty-free rates available under trade agreements or preference programs. A letter code next to the rate signals which program applies.
- Column 2: significantly higher rates for goods from countries without NTR status. As of 2025, that means Cuba, North Korea, Russia, and Belarus.3U.S. Customs and Border Protection. Column 1 / Column 2 / MFN / NTR – Countries That Does Business With the United States
Column 2 rates are often dramatically higher than Column 1 rates for the same product. Misidentifying country of origin, or failing to claim a trade preference you qualify for, can inflate your duty bill considerably.
Additional Tariffs Layered on Top
Base rates are only part of the bill. Chapter 99 of the HTSUS imposes additional tariffs tied to specific subheadings, so your classification number also determines whether extra duties apply.
Section 232 tariffs on steel and aluminum work this way. Only products classified under the HTSUS codes listed in the relevant presidential proclamation face the additional duty. When goods are imported as part of a set, whether the set owes Section 232 duties turns on which component gives the set its essential character under the classification rules.4U.S. Customs and Border Protection. Section 232 Tariffs on Steel and Aluminum Frequently Asked Questions
Reciprocal tariffs follow a similar pattern. The additional duty for goods from a given country is calculated against the product’s Column 1 General rate. For some trading partners, the combined rate is set at a floor of 15 percent; goods already at or above that floor face no additional reciprocal duty. Countries not specifically listed carry a baseline additional rate of 10 percent.5The White House. Further Modifying the Reciprocal Tariff Rates Transshipping to dodge these duties carries an extra 40 percent duty on top of what would have applied to goods from the actual country of origin.
One classification error can cascade. If your product falls under a Chapter 99 provision you didn’t account for, you owe the base duty, the additional tariff, and potentially penalties on the underreported amount.
How to Find the Right Number
Start with the product itself. Material composition, primary function, how it was manufactured, and any distinguishing features all affect classification. A steel bracket and an aluminum bracket that look identical can land under different subheadings with different rates. Vague product descriptions are where classification mistakes begin.
The authoritative lookup tool is the USITC’s online Harmonized Tariff Schedule at hts.usitc.gov.6U.S. International Trade Commission. Tariff Affairs You can search by keyword or browse by chapter. The database shows the full classification hierarchy, rates across all columns, and any Chapter 99 notes flagging additional tariffs.
Classification follows six General Rules of Interpretation, which set the order of analysis. The first rule is the most important: classification is determined by the terms of the headings and any relevant section or chapter notes. You only move to later rules when the first one doesn’t resolve the question, such as with mixed materials or multi-function goods.7U.S. Customs and Border Protection. Tariff Classification – An Informed Compliance Publication For most straightforward products, Rule 1 gets you to the answer. Complexity kicks in with composite goods, sets, and items that could plausibly fit under more than one heading.
If you’re still unsure, CBP’s Customs Rulings Online Search System (CROSS) is a searchable database of past classification decisions.8U.S. Customs and Border Protection. About the Customs Rulings Online Search System Rulings on similar products show how CBP has treated comparable goods and the reasoning behind each decision.
Binding Rulings Before You Import
When existing rulings don’t answer your question, you can request a binding ruling from CBP before importing. This produces a formal written decision on how your product will be classified. The classification in a binding ruling is legally enforceable, though the duty rate itself isn’t locked in since rates can change.9U.S. Customs and Border Protection. Binding Ruling Program
Requests go through CBP’s electronic ruling (eRuling) system or by letter. Either way, you describe the product in detail and may need to provide a physical sample. CBP estimates preparing a request takes about 10 hours.10U.S. Customs and Border Protection. Electronic Ruling (eRuling) Template Binding rulings are worth the effort for high-value or high-volume imports where a small rate difference translates to real money. They also protect you: a good-faith classification based on a binding ruling limits your exposure if CBP later takes a different position.
HTSUS Numbers Are for Imports Only
The HTSUS governs imports. Exports use a separate system called Schedule B, administered by the Census Bureau. The two share the same first six digits for any given product but diverge after that.11International Trade Administration. Harmonized System (HS) Codes
Schedule B has about 9,000 codes compared to roughly 19,000 HTSUS codes, so multiple HTSUS numbers can map to a single Schedule B number.12U.S. Census Bureau. Exporting With Import Classification Numbers If your business both imports and exports the same product, don’t assume your HTSUS number will work on an export filing. Census will reject it when Schedule B calls for different statistical detail.
What It Costs to Get It Wrong
Federal law requires importers to use “reasonable care” when classifying goods and declaring their value. The language comes directly from the entry statute and means what it sounds like: CBP expects you to do the work, not guess.13Office of the Law Revision Counsel. 19 U.S. Code 1484 – Entry of Merchandise
When classification errors happen, penalties scale with culpability:
- Negligence: up to two times the duties the government was shortchanged, or 20 percent of the dutiable value if the error didn’t affect duties owed.
- Gross negligence: up to four times the lost duties, or 40 percent of the dutiable value.
- Fraud: up to the full domestic value of the merchandise, which can dwarf the duty amount itself.14Office of the Law Revision Counsel. 19 USC 1592 – Penalties for Fraud, Gross Negligence, and Negligence
Self-disclosure carries a real benefit. If you discover a classification error and report it to CBP before an investigation starts, penalty exposure for negligence or gross negligence drops to interest on the unpaid duties. For fraud with prior disclosure, the maximum penalty is capped at 100 percent of the lost duties rather than the full domestic value.14Office of the Law Revision Counsel. 19 USC 1592 – Penalties for Fraud, Gross Negligence, and Negligence
Every record related to your import entries, including the HTSUS classification you declared, must be kept for five years from the date of entry.15eCFR. 19 CFR 163.4 – Record Retention Period That covers commercial invoices, classification worksheets, and correspondence with your customs broker. If you can’t produce those records during an audit, you lose the ability to show reasonable care, which is exactly the standard the penalty statute measures you against.