US Import Duty Calculator & Tariff Simulator

What the US customs duty calculator returns

The tool above is a US import duty calculator built on the Harmonized Tariff Schedule of the United States (HTSUS). You give it four things and it gives back the customs side of your landed cost, line by line, so you can see which measure each dollar of duty comes from rather than a single blended percentage.

Data sources. Column 1 rates are read from the USITC Harmonized Tariff Schedule of the United States, 2026 Revision 18, published 2 September 2026. Section 301, 232, 201 and 122 measures are loaded from the Federal Register proclamations and notices and the CBP CSMS messages that implement them, each with its origin scope and effective dates, and every change is logged on the tariff updates page. MPF and HMF use the amounts in CBP's fiscal year 2026 customs user fee notice. The engine stamps each calculation with the date of the measure set it used, so an estimate can always be tied back to the rules that produced it.

How U.S. import duty is calculated

Every U.S. entry is priced the same way, whether you file it yourself or through a broker. The calculator above runs these steps against the current HTSUS. The arithmetic is set out here so you can sanity-check any estimate before you commit to a purchase order.

Step 1. Classify the goods under an HTS code

U.S. duty rates attach to the 10-digit HTS number, not to the product name. The first six digits are the international HS heading and subheading; digits seven and eight are the U.S. tariff line that carries the rate, and digits nine and ten are the statistical suffix. Classification is the importer's legal responsibility, and the difference between two neighbouring lines is often several percentage points. Search by product description in the tool above, use the HTS code finder, or start from the HS codes table in the relevant commodity guide.

Step 2. Apply the duty rate to the customs value

Duty is assessed on the customs value, which for most imports is the transaction value: the price actually paid or payable for the goods, excluding international freight and insurance, so the duty base is usually the FOB value rather than the CIF value (see customs value and entry date below).

Each HTS line carries up to three rates. Column 1 "General" is the rate for normal-trade-relations origins. Column 1 "Special" is Free or reduced for origins that qualify under a listed preference programme or free trade agreement, and qualification has to be documented, not assumed. Column 2 applies to the small group of countries that do not have normal trade relations with the United States.

Step 3. Add any additional tariffs that apply

Trade-remedy duties sit on top of the Chapter 1 to 97 rate and are reported on a separate Chapter 99 line. The simulator reads the origin scope and effective dates of each line from the tariff schedule itself, so it applies a measure only to the origins and entry dates it covers. Section 301 on goods of Chinese origin is still the programme that affects the most importers: List 3 adds 25% under HTS 9903.88.03 and List 4A adds 7.5% under HTS 9903.88.15. Since 24 July 2026 a second Section 301 action adds 10% or 12.5% to goods from about 60 economies, including India, China, Vietnam and the EU, under HTS 9903.05.20 to 9903.05.84. Section 232 duties apply by product rather than origin: steel, aluminum and copper articles, passenger vehicles and parts, medium and heavy trucks, softwood lumber, upholstered wooden furniture and kitchen cabinets, and, from 3 September 2026, unmanned aircraft at 100% or 25% by weight band under HTS 9903.08.21 and 9903.08.22. Quartz surface products carry a Section 201 safeguard from 15 August 2026. For entry dates between 24 February and 23 July 2026 the 10% Section 122 surcharge applies, with its product exemptions for electronics, pharmaceuticals, energy and other goods; a court has since held that surcharge unlawful, and the Section 122 refund calculator covers what that ruling did and did not do and which filing windows are still open. IEEPA tariffs are no longer collected: the Supreme Court held on 20 February 2026 that IEEPA does not authorise tariffs, and collection ceased on 24 February 2026. If you paid IEEPA duties on earlier entries, the IEEPA tariff refund calculator walks through the claim. Anti-dumping and countervailing duties are driven by product-specific scope rulings and are never part of a generic estimate.

Step 4. Add the CBP user fees, MPF and HMF

Two federal fees apply to most commercial ocean entries:

• Merchandise Processing Fee (MPF) is 0.3464% of the customs value on formal entries. For fiscal year 2026 it is subject to a floor of $33.58 and a ceiling of $651.50 per entry, effective 1 October 2025. Because of those limits, the percentage only moves between roughly $9,694 and roughly $188,077 of customs value: below that you pay the floor, above it you pay the ceiling.
• Harbor Maintenance Fee (HMF) is 0.125% of the customs value, with no floor and no ceiling. It applies to cargo loaded or unloaded from a commercial vessel at a subject port, so an air or land border arrival pays no HMF at all.

Step 5. Total the landed cost

Customs value plus duty, plus any Chapter 99 additional tariff, plus MPF and HMF gives the customs side of your landed cost. That is what the calculator returns. Ocean or air freight, insurance, terminal handling, drayage, warehousing and brokerage fees sit outside it and have to be added separately before you can price a sale.

How to find your HTS code

The search box at the top of this page matches a product description against the tariff schedule and returns 10-digit lines with their Column 1 rate. If you would rather work down from the chapter, the HTS code finder shows the chapter, heading and subheading hierarchy with the General and Special rates on each line, and opens this calculator with the line and origin already filled in.

Three checks before you rely on a code: match the line to the form, material and use of the goods, not to the product's trade name; read the section and chapter notes, which often move an item out of the heading it seems to belong in; and where two neighbouring lines carry different rates, have a licensed customs broker confirm the classification, because it is the importer's legal responsibility and CBP can reclassify at entry. For the highest-value US import lines the import duty pages by HTS code and country already have the duty components written out, and the commodity guides list the HS codes we see most often in each product group.

Customs value and entry date

Duty is assessed on the customs value of the goods. For most imports that is the transaction value: the price actually paid or payable for the merchandise when sold for exportation to the United States (19 CFR 152.103). The regulation defines that price as the total payment to the seller excluding the charges for transportation, insurance and related services incident to the international shipment from the country of exportation to the place of importation (19 CFR 152.102(f)), which is why the duty base is normally the FOB price rather than the CIF price.

Some items are added to the invoice price if they are not already in it: packing costs and selling commissions incurred by the buyer, the value of any assist (tooling, moulds, materials or design work you supply to the manufacturer), royalties or licence fees paid as a condition of the sale, and any proceeds of resale that accrue to the seller (19 CFR 152.103(b)). Post-importation transport, construction and assembly costs and the customs duties and federal taxes themselves are excluded (19 CFR 152.103(i)). Enter the value after those adjustments, and if your supplier invoices you CIF, back out the freight and insurance before you type the figure.

The entry date matters because every additional-duty measure has a start date and some have an end date, applied from 12:01 a.m. Eastern time on the day named in the proclamation or notice. The Section 232 duty on unmanned aircraft applies to entries from 3 September 2026; the Section 301 duty on goods from about 60 economies from 24 July 2026; the Section 122 surcharge only to entries from 24 February to 23 July 2026; IEEPA duties to no entry after 24 February 2026. The calculator tests each measure against the date you enter, so use the date the goods will be entered for consumption, not the date they ship. The MPF floor and ceiling also change each 1 October with CBP's fiscal year.

Worked examples

Three commodities Airlift moves regularly, calculated at a $0 freight assumption so only the customs arithmetic is visible. Every rate below is the Column 1 General rate from the current HTSUS for the heading named; check your own 10-digit line, because statistical suffixes within one heading can carry different treatment.

Example 1: Polished granite slabs from India, HTS 6802.23.00

Worked monumental or building stone of granite falls in HTS 6802.23.00 at a Column 1 General rate of 3.7%. Rough granite blocks that have only been sawn into rectangular slabs classify earlier, under HTS 2516.12.00 at 2.8%, so how far the stone has been processed before export changes the duty.

Example 2: Cotton knit T-shirts, HTS 6109.10.00

T-shirts and singlets of cotton fall in HTS 6109.10.00 at a Column 1 General rate of 16.5%, one of the highest normal rates in the schedule. Apparel is where origin matters most: the same goods of Chinese origin also carry Section 301 List 4A at 7.5% under HTS 9903.88.15 and, since 24 July 2026, the 12.5% Section 301 action under HTS 9903.05.31, taking the effective duty to 36.5%. Goods of Indian origin carry the 10% line under HTS 9903.05.44 instead, for an effective 26.5%.

Example 3: Stone polishing machinery, HTS 8464.20.01

Machine tools for working stone are in heading 8464. Grinding or polishing machines classify in HTS 8464.20.01 at 2%, while sawing machines in HTS 8464.10.01 are Free. This example also shows the MPF ceiling in action: at a $200,000 customs value the uncapped calculation would be $692.80, so the fee is limited to the fiscal year 2026 maximum of $651.50.

What the calculator does and does not cover

What it covers

• The Column 1 General, Special or Column 2 rate for your HTS code and origin
• Chapter 99 additional tariff lines the engine holds for that code, origin and entry date, shown as separate rows in the breakdown
• Merchandise Processing Fee and Harbor Maintenance Fee at the published fiscal year 2026 amounts
• A customs landed cost of value plus duty plus those fees
• Historical U.S. import statistics showing the largest supplying countries for the same HTS code

What it does not cover

• Anti-dumping and countervailing duties, which depend on product-specific orders and scope rulings and differ by exporter
• Exclusions that have to be claimed on the entry. The Section 301 China exclusions under 9903.88.69 and 9903.88.70, for example, run to 9 November 2026 and apply only where the goods match the exclusion text exactly; treat an exclusion as something to confirm with your broker, not as granted
• Free trade agreement or preference qualification, which needs origin documentation rather than a rate lookup
• Binding rulings. The estimate is not a CBP ruling; for certainty on a classification or valuation question before you import, request a binding ruling under 19 CFR Part 177
• Quota, licensing, partner government agency holds (FDA, USDA, EPA, CPSC) and other admissibility questions
• Duty drawback, foreign trade zone treatment and bonded warehouse deferral
• Ocean or air freight, insurance, terminal handling, drayage, demurrage, warehousing and brokerage fees
• The final amount payable. CBP determines that at entry, and classification remains the importer's responsibility

Trade-remedy coverage changes often, and the simulator is updated as the tariff schedule changes. Its additional-duty lines have been checked against Airlift's own broker-filed entry summaries and against Census records of the duty CBP collects, so the Chapter 99 lines you see are the ones brokers file. Classification remains the importer's responsibility, so have a borderline code checked before you file. Airlift arranges customs clearance through our licensed broker network and can put that check in front of a licensed broker for you.

Developers: embed this calculator on your own site or call the same engine directly. The tariff API and embeddable widget page has the endpoints, request and response shapes, rate limits and a two-line embed snippet.

Last updated: September 14, 2026. Duty rates cited on this page were checked against the Harmonized Tariff Schedule of the United States, 2026 Revision 18, and the MPF and HMF amounts against the CBP fiscal year 2026 customs user fee notice, on that date.

Who uses the calculator, and when

Import duties can change the economics of a purchase order more than the freight does, and the rate depends on the product's HTS code, the country of origin, the customs value and the date the goods enter the United States. Many importers only see those details on the entry summary. Running the calculator first puts them in front of the decision instead of behind it.

• Importers and SMEs estimating the customs cost of an order before raising a purchase order
• Sourcing and procurement teams comparing the same HTS line across two or three origin countries
• Finance teams building duty into pricing and margin plans, and re-running it when a measure changes
• Anyone working with HTS codes who needs the duty components written out rather than a single blended rate

Related tools and pages

• HTS code finder — Browse the schedule by chapter and heading and hand a 10-digit line back to this calculator.
• US import duty by HTS code and country — Pre-computed duty pages for the highest-value US import lines, run through the same engine.
• Tariff updates — Dated log of every Section 301, 232, 201 and 122 change the engine tracks, with the Chapter 99 headings.
• Section 122 refund calculator — What the 10% surcharge cost you on entries from 24 February to 23 July 2026 and which filing windows are open.
• IEEPA tariff refund calculator — Refunds on IEEPA duties paid before collection ended on 24 February 2026.
• US customs clearance services — How entries are filed through our licensed customs-broker network, with the duty deposit funded before arrival.
• Importer Security Filing (ISF) — The ocean-only filing due 24 hours before loading, which Airlift files as the NVOCC.
• Ocean freight rate search — Lane rates to put alongside the duty figure for a full landed cost.
• Tariff API and embeddable widget — Call the same engine directly or embed this calculator on your own site.

For historical Census calculated-duty ratios, our research report on effective US tariff rates, March–July 2026 compares calculated duty per $100 of import value across its origin sample. Calculated duty may differ from amounts paid.