US Import Duty Calculator & Tariff Simulator

What the customs duty calculator needs and returns

You enter four things. The calculator returns the customs side of your landed cost, line by line, so you can see which measure each dollar of duty comes from instead of one blended percentage.

Where the data comes from. Column 1 rates: the USITC Harmonized Tariff Schedule of the United States, 2026 Revision 19, published September 15, 2026. Section 301, 232, 201 and 122 measures: the Federal Register proclamations and notices and the CBP CSMS messages that implement them, each with its origin scope and effective dates. Every change is logged on the tariff updates page. MPF and HMF: CBP's fiscal year 2026 customs user fee notice. Each calculation is stamped with the date of the measure set it used, so any estimate can be traced back to the rules that produced it.

How US import duty is calculated

In short: customs value × the HTS duty rate, plus any additional tariffs, plus MPF and HMF. Every US entry is priced the same way, whether you file it yourself or through a broker. The five steps below are what the calculator runs, set out so you can sanity-check any estimate before you commit to a purchase order.

Step 1. Classify the goods under an HTS code

US duty rates attach to the 10-digit HTS number, not the product name. The first six digits are the international HS heading and subheading, digits seven and eight are the US tariff line that carries the rate, and digits nine and ten are the statistical suffix. Classification is the importer's legal responsibility, and two neighboring lines often differ by several percentage points. Search by product 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 charged on the customs value, which for most imports is the price paid for the goods without international freight and insurance: usually the FOB value, not the CIF value (details under customs value and entry date below). Each HTS line carries up to three rates:

• Column 1 General: the rate for origins with normal trade relations.
• Column 1 Special: Free or reduced for origins that qualify under a listed preference program or free trade agreement. Qualification has to be documented, not assumed.
• Column 2: for the small group of countries without normal trade relations with the United States.

Step 3. Add any additional tariffs

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 each line's origin scope and effective dates from the tariff schedule itself, so it applies a measure only to the origins and entry dates it covers:

• Section 301, China: still the program 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.
• Section 301, about 60 economies: since July 24, 2026, 10% or 12.5% on goods from origins including India, China, Vietnam and the EU, under HTS 9903.05.20 to 9903.05.84.
• Section 232: applies by product, not origin. Steel, aluminum and copper articles, passenger vehicles and parts, medium and heavy trucks, softwood lumber, upholstered wooden furniture and kitchen cabinets and, from September 3, 2026, unmanned aircraft at 100% or 25% by weight band under HTS 9903.08.21 and 9903.08.22.
• Section 201: a safeguard on quartz surface products from August 15, 2026.
• Section 122: a 10% surcharge on entries from February 24 to July 23, 2026, with product exemptions for electronics, pharmaceuticals, energy and other goods. A court has since held the surcharge unlawful; the Section 122 refund calculator explains what that ruling did and did not do, and which filing windows are still open.
• IEEPA: no longer collected. The Supreme Court held on February 20, 2026, that IEEPA does not authorize tariffs, and collection ceased on February 24, 2026. If you paid IEEPA duties on earlier entries, the IEEPA tariff refund calculator walks through the claim.
• Anti-dumping and countervailing duties (AD/CVD): driven by product-specific scope rulings, so 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): 0.3464% of the customs value on formal entries, with a fiscal year 2026 floor of $33.58 and ceiling of $651.50 per entry, effective October 1, 2025. In practice the percentage only applies between roughly $9,694 and roughly $188,077 of customs value. Below that you pay the floor; above it, the ceiling.
• Harbor Maintenance Fee (HMF): 0.125% of the customs value, with no floor or ceiling. It applies to cargo loaded or unloaded from a commercial vessel at a subject port, so air and land border arrivals pay no HMF.

Step 5. Total the customs landed cost

Customs value + duty + any Chapter 99 additional tariffs + MPF + HMF = the customs side of your landed cost. That is what the calculator returns. Add ocean or air freight, insurance, terminal handling, drayage, warehousing and brokerage fees separately before you set a selling price.

How to find your HTS code

Type a product description in the search box at the top of this page. It returns matching 10-digit lines with their Column 1 rate. To work down from the chapter instead, use the HTS code finder: it 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 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. They often move an item out of the heading it seems to belong in.
• Where two neighboring lines carry different rates, have a licensed customs broker confirm the classification. 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

Customs value is normally the FOB price, not the CIF price. For most imports it 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). That price excludes 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)).

Add these to the invoice price if they are not already in it (19 CFR 152.103(b)):

• Packing costs and selling commissions incurred by the buyer
• The value of any assist: tooling, molds, materials or design work you supply to the manufacturer
• Royalties or license fees paid as a condition of the sale
• Any proceeds of resale that accrue to the seller

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. If your supplier invoices you CIF, back out the freight and insurance before you type the figure.

Use the date the goods will be entered for consumption, not the date they ship. 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 calculator tests each measure against the date you enter:

• Section 232 on unmanned aircraft: entries from September 3, 2026
• Section 301 on goods from about 60 economies: entries from July 24, 2026
• Section 122 surcharge: entries from February 24 to July 23, 2026 only
• IEEPA duties: no entries after February 24, 2026

The MPF floor and ceiling also change every October 1 with CBP's fiscal year.

Worked examples

Three products Airlift moves regularly, with freight left out so only the customs arithmetic shows. Each 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 be treated differently.

Example 1: Polished granite slabs from India, HTS 6802.93.00

Polished granite slabs, worked beyond simply cut or sawn, fall in HTS 6802.93.00 (statistical line 6802.93.00.10) at a Column 1 General rate of 3.7%. Granite only cut or sawn to a flat surface falls in HTS 6802.23.00 at the same 3.7%, and rough blocks only sawn into rectangular slabs classify earlier, under HTS 2516.12.00 at 2.8%, so how far the stone is processed before export changes the line. The table shows the Column 1 duty only: Indian-origin granite also carries the 10% Section 301 line (HTS 9903.05.44) shown in Example 2. Engineered quartz slabs are a different product, under heading 6810, with AD/CVD deposits and a Section 201 quota that this calculator does not add. The granite and quartz slab guide sets out both stacks.

Example 2: Cotton knit T-shirts, HTS 6109.10.00

Cotton T-shirts and singlets 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. Goods of Chinese origin also carry Section 301 List 4A at 7.5% under HTS 9903.88.15 and, since July 24, 2026, the 12.5% Section 301 action under HTS 9903.05.31: an effective duty of 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 and polishing machines classify in HTS 8464.20.01 at 2%; sawing machines in HTS 8464.10.01 are Free. This example also shows the MPF ceiling at work: at a $200,000 customs value the uncapped fee would be $692.80, so it is limited to the fiscal year 2026 maximum of $651.50.

What the calculator covers and what it leaves out

Included

• The Column 1 General, Column 1 Special or Column 2 rate for your HTS code and origin
• The Chapter 99 additional tariffs the engine holds for that code, origin and entry date, each as its own row
• Merchandise Processing Fee and Harbor Maintenance Fee at the published fiscal year 2026 amounts
• A customs landed cost: value plus duty plus those fees
• Historical US import statistics showing the largest supplying countries for the same HTS code

Not included

• 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 November 9, 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, not 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.
• Quotas, 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. If your code is borderline, have it checked before you file: we arrange customs clearance through our licensed broker network and can have a licensed broker review the classification.

Developers: call the same engine directly or embed this calculator on your own site. 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. On that date, the duty rates cited on this page were checked against the Harmonized Tariff Schedule of the United States, 2026 Revision 19, and the MPF and HMF amounts against the CBP fiscal year 2026 customs user fee notice.

Who uses the calculator, and when

Import duty can change the economics of a purchase order more than freight does, and it depends on the HTS code, the country of origin, the customs value and the entry date. Many importers first see those figures on the entry summary, after the goods have shipped. Running the calculator first puts them in front of the buying decision.

• Importers and small businesses estimating the customs cost of an order before placing 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 each duty component written out, not a single blended rate

Related tools and pages

• HTS code finder — Browse the tariff schedule by chapter and heading, then send the 10-digit line back to this calculator.
• US import duty by HTS code and country — Ready-made 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 its Chapter 99 headings.
• Section 122 refund calculator — What the 10% surcharge cost you on entries from February 24 to July 23, 2026, and which filing windows are open.
• IEEPA tariff refund calculator — Refunds of IEEPA duties paid before collection ended on February 24, 2026.
• US customs clearance services — How your entry is 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 add to the duty figure for a full landed cost.
• Tariff API and embeddable widget — Call the same engine from your own systems, or embed this calculator on your 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.