Customs duty rates in the United States are set by the Harmonized Tariff Schedule and depend on three inputs: what the product is, what customs decides it’s worth, and where it was made. The rate you read next to your product’s classification code is only the starting point. Layers of additional tariffs, user fees, and trade enforcement duties routinely stack on top, and in 2025 and 2026 those extra layers have grown large enough to eclipse the base rate itself. Getting the math right means working through each layer in order.
The Three Ways a Duty Gets Calculated
U.S. Customs and Border Protection applies one of three formulas to any given import, and the Harmonized Tariff Schedule tells you which.1Office of the Law Revision Counsel. 19 U.S.C. 1500 – Appraisement, Classification, and Liquidation Procedure
An ad valorem rate is a percentage of the goods’ value. A 5% rate on a $10,000 watch shipment produces $500 in duty. Most consumer products use this method.
A specific rate is a flat dollar amount tied to a physical measurement — weight, volume, count. A rate of $0.50 per liter doesn’t move when the product’s price moves. Agricultural commodities and raw materials often work this way.
A compound rate combines the two: perhaps 4% of value plus $0.15 per pound. You need clean records of both the price and the physical quantity to calculate it correctly.
Finding Your Rate in the Harmonized Tariff Schedule
Every importable product has a classification code in the Harmonized Tariff Schedule, and that code determines the duty rate. The HTS is the legal authority established under federal law for classifying imports.2Office of the Law Revision Counsel. 19 U.S.C. 1202 – Harmonized Tariff Schedule The U.S. International Trade Commission publishes the current version online.
Each product gets a 10-digit classification number. The first six digits follow an international standard shared by most trading nations, so a laptop opens with the same digits whether it enters the U.S., Germany, or Japan. The last four digits are U.S.-specific and capture statistical detail.3International Trade Administration. Harmonized System (HS) Codes The rate you’ll read next to your code in the “General” subcolumn of Column 1 is what applies to goods from most trading partners.
Classification is where importers make their most expensive mistakes. Picking the correct code is the importer of record’s responsibility. A negligent misclassification can cost up to twice the duties the government lost. A fraudulent one can reach the full domestic value of the merchandise.4Office of the Law Revision Counsel. 19 U.S.C. 1592 – Penalties for Fraud, Gross Negligence, and Negligence
Locking in a Rate Before You Ship
If you aren’t sure how a product should be classified, you can ask CBP for a binding ruling before the goods leave the exporter. Requests go through CBP’s eRulings portal, and the agency typically issues a ruling within 30 calendar days. Complex cases requiring lab work or interagency review may take up to 90 days.5U.S. Customs and Border Protection. Requirements for Electronic Ruling Requests The ruling must be for a prospective shipment, and you include the ruling control number with your entry documents when the goods arrive.
How Customs Values Your Goods
For ad valorem and compound duties, the dollar amount you owe depends on how CBP values the shipment. The primary method is transaction value: the price you actually paid or agreed to pay for the merchandise when it was sold for export to the United States.6eCFR. 19 CFR 152.103 – Transaction Value
The invoice price isn’t always the full taxable value. CBP adds several buyer-side costs to the declared price:
- Packing costs the buyer pays
- Selling commissions the buyer pays to an agent
- Assists: materials, molds, tools, or engineering work you provided to the foreign manufacturer to help produce the goods
- Royalties or license fees you’re required to pay as a condition of the sale
- Resale proceeds that flow back to the seller after you resell the goods domestically
The assist category catches many importers off guard. Shipping tooling, components, or production molds to your overseas supplier at your own expense means the value of those items gets added to the import price for duty purposes. Design work done in the United States is excluded.6eCFR. 19 CFR 152.103 – Transaction Value
When transaction value can’t be determined — for instance, when related parties transact at non-arm’s-length prices — CBP works through a hierarchy of fallback methods: transaction values of identical merchandise, then similar merchandise, then a deductive value based on U.S. resale price minus certain deductions, then a computed value built from production costs. An importer can request that CBP try the computed-value method before the deductive one.7eCFR. 19 CFR Part 152 – Classification and Appraisement of Merchandise
If you paid in foreign currency, CBP converts to U.S. dollars at the exchange rate from the date of exportation, using CBP’s own certified rates rather than whatever rate your bank quoted. If that date falls on a day when New York City banks are closed, the rate from the last preceding business day applies.8eCFR. 19 CFR Part 159, Subpart C – Conversion of Foreign Currency
How Country of Origin Changes the Rate
The same product can carry radically different duty rates depending on where it was made. The HTS has multiple rate columns, and origin determines which one applies to your shipment.
Column 1 General: Normal Trade Relations
Most countries hold Normal Trade Relations status (sometimes still called Most Favored Nation treatment). Goods from these countries pay the “General” rate in Column 1 — the rate most people think of as the standard duty.9U.S. Customs and Border Protection. Column 1 / Column 2 / MFN / NTR – Countries That Does Business With the United States
Column 1 Special: Free Trade Agreements
Preferential rates below the general Column 1 rate are available when goods qualify under a free trade agreement such as the USMCA, which covers the U.S., Mexico, and Canada. These agreements often bring the rate to zero, but only when the product satisfies strict rules of origin. Simply routing goods through a partner country doesn’t qualify; a certificate of origin proving the goods were genuinely produced or substantially transformed in the partner country is required.
Substantial Transformation for Multi-Country Products
When components come from several countries and assembly happens elsewhere, CBP determines origin by asking where the product underwent a “substantial transformation” — a fundamental change in form, appearance, or character that adds significant value. Repackaging, diluting, or relabeling doesn’t count.10International Trade Administration. Rules of Origin: Substantial Transformation For goods entering under a free trade agreement, the specific FTA defines origin through methods like tariff classification shifts or regional value content thresholds.
Column 2 Countries
Countries without Normal Trade Relations pay the rates in Column 2, which are dramatically higher. As of 2026, Column 2 status applies to Cuba, North Korea, Russia, and Belarus.9U.S. Customs and Border Protection. Column 1 / Column 2 / MFN / NTR – Countries That Does Business With the United States These rates can be many times the Column 1 rate, effectively pricing those goods out of the U.S. market.
Generalized System of Preferences (Currently Lapsed)
The Generalized System of Preferences historically allowed duty-free entry for thousands of products from designated developing countries. The program expired on December 31, 2020, and as of 2026 it remains expired while awaiting Congressional renewal.11U.S. Customs and Border Protection. Generalized System of Preferences (GSP) Any product that previously enjoyed GSP duty-free treatment currently owes the standard Column 1 General rate. If Congress retroactively renews the program, importers who paid duties during the lapse may become eligible for refunds, as has happened in past renewals.
Extra Tariffs That Stack on Top of the HTS Rate
The rate printed in the HTS is increasingly just the starting point. Several categories of additional duty can pile on, and in 2025 and 2026 these layers have reshaped landed costs more than any other factor.
Reciprocal Tariffs
Beginning April 5, 2025, an additional 10% ad valorem duty applies to imports from all trading partners as a baseline reciprocal tariff. Country-specific rates above 10% took effect for certain trading partners beginning April 9, 2025.12Federal Register. Regulating Imports With a Reciprocal Tariff To Rectify Trade Practices These duties apply on top of the HTS rate. Because the specific country rates change often through executive action, check current Federal Register notices or CBP guidance before pricing any planned shipment.
Section 232 Tariffs on Steel, Aluminum, and Copper
National security tariffs under Section 232 impose heavy additional duties on metals. As of April 6, 2026, the general rate for steel, aluminum, and most copper articles is 50% ad valorem on top of any other duties. UK-origin metals produced entirely from UK-smelted or UK-melted and -poured material face a 25% rate. Articles whose metal content was entirely smelted, cast, melted, or poured in the United States owe 10%.13Federal Register. Strengthening Actions Taken To Adjust Imports of Aluminum, Steel, and Copper Into the United States These rates apply to both finished products and derivative articles that contain the covered metals.
Anti-Dumping and Countervailing Duties
When foreign producers sell goods in the U.S. below fair market value, CBP can impose anti-dumping duties equal to the gap between the normal value and the export price.14Office of the Law Revision Counsel. 19 U.S.C. 1673 – Antidumping Duties Imposed When a foreign government subsidizes its exporters, countervailing duties offset that advantage.15Office of the Law Revision Counsel. 19 U.S.C. 1671 – Countervailing Duties Imposed Both are assessed in addition to all other duties, and both are product- and country-specific. Some anti-dumping orders have been in place for decades. Importers occasionally face retroactive assessments when CBP recalculates the duty margin for a prior period, generating bills for shipments that cleared months or years earlier.
Section 301 Tariffs
Section 301 tariffs target unfair trade practices at the country level. The most significant ongoing Section 301 action applies to a broad range of Chinese-origin goods. Rates vary by product category and have been modified multiple times since their initial imposition. For any product sourced from China, consult the USITC’s reference list of affected HTS codes and their corresponding additional duty rates.
The Two Fees That Ride Along
Beyond the duty itself, two fees apply to most commercial imports and are easy to miss when estimating landed costs.
The Merchandise Processing Fee applies to every formal entry (generally goods valued at $2,500 or more) at 0.3464% of the goods’ value for fiscal year 2026, with a floor of $33.58 and a ceiling of $651.50.16Federal Register. Customs User Fees To Be Adjusted for Inflation in Fiscal Year 2026 The floor matters more than the percentage on small formal entries.
The Harbor Maintenance Fee applies to goods arriving by ocean vessel at 0.125% of cargo value.17eCFR. 19 CFR 24.24 – Harbor Maintenance Fee Air freight and overland trucking don’t trigger it. If your supply chain splits between modes, the transport used on the final leg into a U.S. port determines whether the fee applies.
The $800 De Minimis Exemption Is Currently Suspended
Federal law provides a de minimis threshold allowing duty-free entry for shipments with a fair retail value of $800 or less, imported by a single person on a single day.18Office of the Law Revision Counsel. 19 U.S.C. 1321 – Administrative Exemptions For years this exemption powered cross-border e-commerce.
That exemption is currently suspended. Executive orders beginning in 2025 first eliminated de minimis treatment for goods from China and Hong Kong, then expanded the suspension to all countries effective August 29, 2025. As of February 2026, the suspension remains in effect for all shipments regardless of country of origin, value, or mode of transportation, with a narrow exception for goods sent through the international postal network.19The White House. Continuing the Suspension of Duty-Free De Minimis Treatment for All Countries Informational materials like books and films remain exempt under separate legal authority.
In practice, every commercial shipment entering the U.S. now owes applicable duties, taxes, and fees, even a $20 item ordered from an overseas retailer. The statutory $800 threshold still exists in the law and could be restored by executive order or Congress, but importers should not rely on it for current planning.
What Getting the Rate Wrong Costs
Penalties under federal customs law are tiered by culpability, and the numbers escalate quickly:4Office of the Law Revision Counsel. 19 U.S.C. 1592 – Penalties for Fraud, Gross Negligence, and Negligence
- Negligence: up to twice the duties the government lost, or up to 20% of the dutiable value if the error didn’t affect the duty amount.
- Gross negligence: up to four times the lost duties, or up to 40% of the dutiable value if duties weren’t affected.
- Fraud: up to the full domestic value of the merchandise. Criminal prosecution is also possible for deliberate false entries.
The penalty cannot exceed the domestic value of the merchandise in any tier. A careless mistake on a $200,000 shipment can still generate a $400,000 penalty under the gross negligence standard. Importers who catch their own errors before CBP does can file a prior disclosure, which can limit the penalty to interest on the unpaid duties rather than a multiple of them.