A tariff is generally the rate or trade measure applied to imported goods; a customs duty is the charge assessed under the applicable classification and customs rules. Importers often use the terms interchangeably, so treat this as a practical distinction rather than a rigid legal divide. The rate for a U.S. shipment depends on the product’s classification, origin, eligibility for a special rate, and any additional measures that apply.
How tariffs and customs duties differ
In everyday importing, “tariff” often means the rate or trade measure, while “customs duty” means the resulting amount payable. The U.S. Harmonized Tariff Schedule (HTS) labels its rate columns “Rates of Duty,” illustrating how closely the terms are connected in practice. The distinction is useful, but it is not an absolute rule about how the words are used in every legal or commercial context.
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A useful way to think about the calculation is: applicable rate or measure applied to customs value, subject to classification, origin, program eligibility, and other rules. This is a conceptual aid, not a universal formula. Rates can be ad valorem, specific, compound, or preferential, and other measures may apply. The U.S. International Trade Commission (USITC) says transaction value—the price actually paid or payable when goods are sold—is the primary basis for customs value; shipment-specific valuation can depend on additional facts and rules.
How to find the U.S. duty rate for a product
Start with the product’s legal classification, not just a keyword search. The HTS is a hierarchy of legal categories interpreted using the General Rules of Interpretation, additional U.S. rules, and section, chapter, and other legal notes. Material, function, and product details can affect where an item belongs.
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Classify the item before looking up its rate
- Identify the product’s characteristics. Gather details such as what it does, what it is made of, and how it is presented or used. A familiar product name may not appear in the tariff text.
- Find the best four-digit heading. Compare the legal descriptions and relevant notes; do not settle on the first search result that sounds similar.
- Work down to the most specific subheading. Apply the relevant interpretation rules and notes to identify the correct legal provision.
- Check the current U.S. HTS and the full reporting number. The duty rate is assigned at the eight-digit legal provision. The importer reports the complete ten-digit statistical reporting number on the entry; the final two digits subdivide the category for statistical reporting.
- Check the applicable rate column and any other measures. Confirm country of origin, program eligibility, required claims, and relevant Chapter 99 provisions for the shipment.
The first six digits form part of the internationally harmonized system; digits beyond that can differ by country. A supplier’s code from another country may therefore share the same first six digits as the U.S. code but have different later digits. USITC cautions that the HTS is a system of categories, not a plain-language list of every product. For example, a phone charger may be described under a category such as “static converters for telecommunication devices” rather than under the words “phone charger.”
If the classification is unclear
USITC identifies several ways to investigate a difficult classification: review relevant U.S. Customs and Border Protection (CBP) rulings in CROSS, seek informal assistance from a relevant CBP Center of Excellence and Expertise or port import specialist, or request a binding CBP ruling where appropriate. Informal assistance does not bind CBP.
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Which HTS rate column applies?
The HTS’s columns distinguish between general treatment, eligible preferential treatment, and the rates for specified countries. The correct result depends on the current schedule and the shipment’s facts.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errors| HTS column | What it generally covers | What the importer should verify |
|---|---|---|
| Column 1-general | General rates generally available to countries with normal trade relations (NTR) treatment. | Whether the country and product receive this treatment under the current schedule. |
| Column 1-special | Preferential or free rates under trade agreements, preference programs, or statutes. | Whether the product and importer meet the applicable conditions and whether the benefit is properly claimed for this shipment. If a special rate is not claimed, the general rate applies. |
| Column 2 | Rates for products of countries listed in HTS General Note 3(b). | Whether the country is listed in the current HTS. Do not rely on an older country list. |
Country of origin is not necessarily the same as the country from which a shipment was sent. Applicable origin rules and product-specific facts determine whether a rate or preference applies; check the current HTS notes and relevant requirements rather than assuming eligibility from a supplier’s location.
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Why the HTS rate may not be the whole import duty picture
A base rate shown for an HTS classification does not necessarily capture every measure that could apply. Chapter 99 can contain additional tariff measures, so it needs to be checked alongside the product’s ordinary classification.
Antidumping and countervailing (AD/CVD) duties are separate from ordinary customs tariffs and are not ordinary HTS rates. The Department of Commerce’s International Trade Administration sets rates for AD/CVD orders. Whether an order applies depends on factors such as the product’s scope and origin, as well as current instructions. Do not assume that a base HTS rate rules out additional AD/CVD duties.
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The combined tariff and duty treatment is not, by itself, a complete landed-cost estimate. Other charges may depend on shipment type and current CBP requirements; verify those separately for the shipment rather than treating the HTS rate as a total-cost figure.
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Do importers need a customs broker?
U.S. law does not require an importer to hire a customs broker, although many importers use one to help file entries and navigate requirements. Brokers are licensed by CBP. Using one does not transfer the importer’s responsibility: USITC states that importers remain ultimately responsible for knowing CBP requirements and ensuring compliance with federal rules and regulations.
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Check the schedule version and effective date
The HTS changes, and a rate or provision that appeared in an older schedule may not govern a later entry. The USITC archive identifies 2026 HTS Revision 20 as dated September 28, 2026; the archive also lists multiple earlier 2026 revisions and tariff-related modifications. For an entry, confirm the schedule revision and effective date that apply to its date, then verify the classification, country treatment, preference conditions, and any applicable Chapter 99 provisions. The current schedule and its notes—not an undated printout or older explainer—are the reference point for the shipment.
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