A tariff is a government schedule of tax rates applied to imported goods. A duty is the actual tax payment you make based on that schedule. Most importers use these words interchangeably — and that confusion can cost them real money.
Understanding the six key differences between tariffs and duties helps you calculate your landed costs accurately, avoid CBP penalties, and make smarter sourcing decisions. Here is exactly how they differ.
Quick-Reference Comparison Table
| Dimension | Tariff | Duty |
|---|---|---|
| What it is | A schedule or list of tax rates | The actual payment owed |
| Set by | Congress / trade policy | Calculated per shipment |
| Where to find it | hts.usitc.gov | CBP entry documents |
| Applied to | Product categories (HTS codes) | Specific imported goods |
| Can stack? | Multiple tariff schedules exist | Yes — duties from multiple schedules add up |
| Who enforces? | CBP sets the framework | CBP collects at entry |
1. Definition: One Is a Schedule, One Is a Payment
Tariff: A government-published list that assigns a tax rate to each category of imported goods, organized by product classification code.
This is the most fundamental difference — and the one most people miss.
A tariff is a policy document. Specifically, it is the Harmonized Tariff Schedule of the United States (HTSUS), a 99-chapter reference that assigns a rate to every classifiable product. The HTSUS contains over 17,000 individual product codes. When Congress or the Executive Branch wants to change trade policy — say, imposing Section 301 tariffs on Chinese imports — they modify the tariff schedule.
A duty is the dollar amount you actually pay to U.S. Customs and Border Protection (CBP) when your shipment enters the country. It is calculated by applying the tariff rate to the customs value of your goods.
Example: If you import 1,000 cotton T-shirts valued at $5,000 and the applicable tariff rate is 16.5%, your import duty owed is $825. The tariff rate lives in the schedule; the $825 is the duty you pay.
Confusing the two is like confusing a tax rate with a tax bill. Related, but not the same thing.
2. Source Authority: Congress Sets Tariffs, CBP Collects Duties
Tariffs originate from legislation and executive action. Duties are collected by a law enforcement agency.
Tariff rates in the US are established through several mechanisms:
- The Harmonized Tariff Schedule — authorized by Congress under 19 USC § 1202
- Section 301 tariffs — imposed by the US Trade Representative under authority of the Trade Act of 1974
- Section 232 tariffs — imposed by the President under the Trade Expansion Act of 1962 (used for steel and aluminum)
- Most-Favored-Nation (MFN) rates — the baseline rates applied to WTO member countries
Duties, by contrast, are administered and collected by CBP under 19 CFR Part 141. CBP officers at every port of entry review entry documentation, verify classifications, and determine how much duty is owed. They also conduct audits and can issue penalty notices when duties have been underpaid.
Why this matters: If you disagree with a duty amount assessed on your shipment, you file a protest with CBP (Form 19). If Congress changes a tariff rate, that affects every future shipment across the country. These are entirely different processes involving different institutions.
3. Scope: Tariffs Apply to Categories, Duties Apply to Shipments
A tariff rate applies broadly to an entire product classification. A duty is specific to your shipment, your goods, and your declared value.
The HTSUS organizes products into chapters, headings, and subheadings. For example:
- Chapter 61 covers knitted apparel
- Heading 6109 covers T-shirts
- Subheading 6109.10.00 covers cotton T-shirts, with an MFN rate of 16.5%
That 16.5% tariff rate applies to every importer bringing in cotton T-shirts from an MFN country. Your actual duty depends on your specific shipment value, your country of origin (which determines which rate column applies), and whether any additional duties stack on top.
Two importers bringing in identical T-shirts may owe very different duties if one is importing from a country subject to additional Section 301 tariffs and the other is not. The tariff schedule has multiple columns for exactly this reason.
A licensed customs broker who understands HTS classification can identify the correct tariff column for your goods and calculate the duty you’ll actually owe — before your shipment arrives. See 10 Core Duties of a Customs Broker Explained for what brokers do with this information.
4. Types: There Are Multiple Tariff Schedules That Generate Different Duties
Not all duties come from the same tariff schedule. This is where the distinction becomes practically important.
There are several distinct tariff mechanisms, each of which generates its own duty charge — and they stack:
Ad valorem duties — based on a percentage of the goods’ declared customs value. Most standard HTSUS rates are ad valorem (e.g., 5% on the value).
Specific duties — charged per unit, weight, or volume rather than value (e.g., $0.50 per kilogram).
Compound duties — a combination of ad valorem and specific (e.g., 6.8% + $0.23/kg).
Section 301 duties — additional tariffs on goods from China, ranging from 7.5% to 145% depending on which of four product lists apply.
Antidumping (AD) duties — imposed on specific products from specific countries found to be sold below market value. Rates can exceed 200%. Tracked at enforcement.trade.gov/adcvd.
Countervailing duties (CVD) — imposed when a foreign government subsidizes exported goods.
A single shipment can owe the base MFN duty rate plus Section 301 plus antidumping — all layered on top of each other. Each comes from a different tariff order; the combined total is what you pay as duty.
The National Customs Brokers & Forwarders Association of America (NCBFAA) estimates that for some product categories sourced from China, total effective duty rates now exceed 50% once all stacked charges are included.
5. Calculation Basis: Tariff Rates Are Fixed, Duties Are Variable
The tariff rate in the HTSUS is a fixed published number. Your actual duty payment varies with every shipment.
Three variables drive duty calculation:
1. Customs value. CBP calculates duty on the transaction value of goods under 19 CFR Part 152 — generally the price you paid, plus certain additions (assists, royalties). A $10,000 shipment and a $50,000 shipment of the same product carry very different duty bills even at the same tariff rate.
2. Country of origin. The HTSUS has two general rate columns: Column 1 (MFN rates, for most countries) and Column 2 (higher rates for a small number of non-MFN countries). Goods from countries with US free trade agreements (like Mexico under USMCA, or South Korea under KORUS) may qualify for 0% duty even when the standard MFN rate is positive.
3. Quantity and unit of measure. For specific-rate duties, the number of units, kilograms, or liters you import directly changes your total.
US importers paid approximately $80 billion in duties in fiscal year 2023, according to CBP data — up sharply from pre-tariff-war levels of around $30–35 billion annually in 2016–2017. That increase reflects tariff rate changes, not changes in import volumes.
6. Timing: Tariff Changes Are Prospective, Duties Are Assessed at Entry
Tariff schedule changes affect future shipments. Duty liability is determined at the time of entry.
When Congress passes a new trade law or the USTR modifies a Section 301 list, those tariff changes apply to goods entered on or after the effective date. Goods that were already on the water when a tariff increase took effect may qualify for the old rate — or may not, depending on the specific legal language.
Duties, by contrast, are assessed at the moment CBP processes your entry. The rate that applies is the one in effect on your date of entry. This creates real strategic decisions for importers: should you accelerate or delay a shipment to beat a tariff change? Should you request a CBP binding ruling to lock in your classification before a large order ships?
A binding ruling from CBP gives you written confirmation of the correct HTS code and duty rate before your goods arrive — locking in the tariff treatment before the duty is assessed. Many experienced importers and their brokers use this tool as a risk management instrument, not just a compliance check.
How to Apply This Distinction When Importing
Understanding the difference between tariffs and duties is not just academic — it changes how you budget and plan.
Before you order: Look up your HTS code at hts.usitc.gov and identify the correct tariff rate for your country of origin. Check whether your goods fall under any Section 301, antidumping, or countervailing duty orders.
When calculating landed cost: Apply the tariff rate to your customs value to estimate your duty. Add any stacked duties. Factor in MPF (Merchandise Processing Fee, currently 0.3464% of value) and HMF (Harbor Maintenance Fee, 0.125% of value for ocean shipments) — these are separate from duty but still collected by CBP.
When sourcing: The same tariff rate applies to all importers for a given product and origin country. If a competitor is paying lower duties, they either have a different HTS classification, a different country of origin, or a free trade agreement benefit you haven’t claimed.
When in doubt: A licensed customs broker can confirm your HTS classification, identify all applicable duty rates, and calculate your total landed cost before your shipment departs. You can search all CBP-licensed customs brokers to find one with expertise in your product category, or browse by specialty if your goods fall into a regulated vertical like pharmaceuticals, food, or chemicals.
For complex supply chains involving warehousing and distribution, see 3PL With Customs Clearance and Warehousing Explained for how duty liability interacts with fulfillment operations.
You can also browse brokers by U.S. port of entry to find a licensed broker at the specific port where your goods will arrive — whether that’s a sea port, air cargo facility, or land border crossing.
Frequently Asked Questions
What is the difference between a tariff and a duty?
A tariff is a government-published schedule or list that sets the tax rates applied to imported goods. A duty is the actual dollar amount you pay based on that schedule. In short, the tariff tells you the rate; the duty is the payment itself.
How do I know which tariff rate applies to my goods?
You find the correct rate by looking up your product’s HTS (Harmonized Tariff Schedule) code at hts.usitc.gov. The HTS code determines which tariff column applies, which then sets your duty rate. A licensed customs broker can confirm the correct classification and flag any additional duties, such as antidumping or Section 301 charges.
How much will I pay in duties when importing to the US?
Duty amounts vary widely. Most-Favored-Nation (MFN) duty rates in the US average around 3.4% across all product categories, but individual rates range from 0% on some electronics to over 30% on certain apparel and footwear. Section 301 tariffs on Chinese goods add an additional 7.5%–145% depending on the product list.
Are antidumping duties the same as regular import duties?
No. Regular duties are set by the Harmonized Tariff Schedule and apply broadly to a product category. Antidumping duties (AD duties) are a separate, additional charge imposed specifically on goods found to be sold below fair market value. They are tracked separately at enforcement.trade.gov/adcvd and can run into the hundreds of percent.
What is the most common mistake importers make with tariffs and duties?
The most common mistake is misclassifying goods under the wrong HTS code, which leads to paying the wrong duty rate — either overpaying or, worse, underpaying and facing a CBP audit. A second frequent error is failing to account for additional duties like Section 301, antidumping, or countervailing duties that stack on top of the base tariff rate.
Getting your tariff classification right the first time is the single most reliable way to avoid unexpected duty bills, CBP audits, and delayed shipments. Search all CBP-licensed customs brokers to find a verified professional who can confirm your HTS codes, calculate your full duty exposure, and clear your goods without surprises. If you already know your port of entry, browse by U.S. port of entry to find a broker licensed at the exact facility handling your cargo.