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Import Duty & Customs Fee Calculator
Your numbers
Stacks on top of the regular duty rate, and several programs can apply at once, so enter the sum. Common on China-origin goods. Leave at 0 if none.
Total customs owed
$547.14
Duty, tariffs, and user fees come to an effective 5.5% of your customs value, about $1.09 per unit. Drop this into your landed cost to price the shipment.
Duty
$500.00
5% of value
Additional tariff
—
None entered
MPF
$34.64
0.3464% of value
HMF
$12.50
Ocean only
Estimate for planning. MPF minimum and maximum shown are FY2026 figures (effective October 1, 2025); CBP re-indexes them every October. Your duty rate comes from your product's HTS code and country of origin, so confirm rates with your customs broker.
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Keep duty and landed cost current on every SKU
This page prices one entry. Inventory Hero folds duty and the customs user fees into the landed cost it stores per SKU, and updates it as tariffs and freight move, so your margin and reorder math always run on what units actually cost to import, not last year's rate.
- Duty and customs fees rolled into landed cost per SKU
- Updates as tariffs and freight rates change
- Flags products whose margin import costs have quietly eroded
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How the customs bill is calculated
Total customs owed
Total = duty + additional tariff + MPF + HMF
- Duty= customs value x duty rate. The duty rate comes from your product's HTS code and country of origin.
- Additional tariff = customs value x trade-action rate (such as Section 301), when one applies.
- MPF = 0.3464% of the customs value, with a minimum of $33.58 and a maximum of $651.50 per formal entry.
- HMF = 0.125% of the customs value, on ocean imports only, with no minimum or maximum.
The MPF minimum and maximum are the FY2026 figures, effective October 1, 2025. CBP re-indexes them for inflation every October. Source: Federal Register, Customs User Fees for Fiscal Year 2026 (CBP Dec. 25-10).
Worked example
You import a $10,000 FOB shipment of 500 units by ocean, at a 5% duty rate, with no additional tariff.
- Duty: 5% of $10,000 = $500.00
- MPF: 0.3464% of $10,000 = $34.64 (inside the $33.58 to $651.50 band)
- HMF: 0.125% of $10,000 = $12.50 (ocean cargo)
- Total customs owed: $500 + $34.64 + $12.50 = $547.14, an effective 5.5% of the customs value, about $1.09 per unit
The 5% duty here is illustrative. Your real rate depends on your HTS code and country of origin, and for China-origin goods the additional tariffs usually dominate: the same shipment with a 25% Section 301 tariff stacked on the 5% base owes $500 + $2,500 + $34.64 + $12.50 = $3,047.14, an effective 30.5% and about $6.09 per unit. Run your own rates in the calculator above rather than assuming the friendly case.
Drop that $1.09 per unit into the landed cost calculator as part of your other fees, then carry the landed cost into the FBA profit calculator. To size the shipment those cartons ship in, use the CBM calculator.
Key terms
- HTS code
- The Harmonized Tariff Schedule code that classifies your product for customs. It, together with the country of origin, sets your regular duty rate. Look yours up at hts.usitc.gov or have your broker classify it.
- MPF (Merchandise Processing Fee)
- A US customs user fee on formal entries: 0.3464% of the customs value, with a $33.58 minimum and a $651.50 maximum per entry for FY2026. The importer of record pays it, and it applies even to duty-free goods.
- HMF (Harbor Maintenance Fee)
- A customs user fee of 0.125% of cargo value on goods arriving by ocean at a US port, with no minimum or maximum. Air, truck, and rail shipments do not pay it.
Frequently asked questions
How do I find my product's duty rate?
Your regular duty rate comes from your product's HTS (Harmonized Tariff Schedule) code and its country of origin. Look the code up in the official schedule at hts.usitc.gov, or ask your customs broker, who classifies it for you on every entry. Then check the same HTS code against the current trade-action lists (USTR publishes the Section 301 lists and exclusions, and CBP publishes current IEEPA and reciprocal-tariff guidance), because the additional tariff often moves your real rate far more than the base duty does. Rates range from 0% for many duty-free goods to well over 20%. This calculator never guesses a rate, because only your specific product and origin determine it. Duty-free goods still pay the MPF and, on ocean cargo, the HMF.
What is the Merchandise Processing Fee (MPF), and who pays it?
The MPF is a US customs user fee the importer of record pays on a formal entry. It is 0.3464% of the customs value, with a minimum of $33.58 and a maximum of $651.50 per entry for fiscal year 2026 (effective October 1, 2025). The minimum binds on shipments under about $9,700 of value, and the maximum caps out above about $188,000. On a $10,000 entry the MPF is $34.64, inside the band.
What is the Harbor Maintenance Fee (HMF), and does air freight pay it?
The HMF is a customs user fee of 0.125% of the cargo value, charged on goods that arrive by ocean at a US port. There is no minimum or maximum. Air freight, truck, and rail do not pay the HMF, so if your shipment comes in by air the HMF is $0. On a $10,000 ocean entry the HMF is $12.50.
What are Section 301 tariffs, and do they stack on top of the duty rate?
Section 301 tariffs are trade-action duties applied to many China-origin goods on top of the regular HTS duty rate, not instead of it. If your product carries a 5% regular rate and a 25% Section 301 tariff, customs collects both, so 30% of the customs value in duty and tariff combined. Several trade-action programs (Section 301, IEEPA and reciprocal actions) can hit the same product at once, so enter the SUM of every additional rate that applies to your HTS code in the additional tariffs field.
Is duty charged on the product value or the product plus freight?
In the US, duty is assessed on the transaction value, which for most ocean shipments is the FOB commercial-invoice price, so charging duty on the FOB value here is accurate. Many other countries use CIF valuation, which is the goods plus international freight and insurance, and would produce a higher duty base. This calculator is the US case; if you are importing elsewhere, your customs bill will differ.
Do customs fees change, and what does this calculator not cover?
Yes. CBP re-indexes the MPF minimum and maximum for inflation every fiscal year, effective the start of October, so those two figures move annually even though the 0.3464% rate has held. This tool covers the US formal-entry case: regular duty, an optional trade-action tariff, the MPF, and the HMF. It does not cover antidumping or countervailing duties, informal entries and de-minimis shipments (a distinction that matters more since the 2025 de-minimis changes: assume your commercial FBA shipment clears as a formal entry), or your customs broker's and freight forwarder's service fees, which are quotes rather than published rates. Treat the result as a planning estimate and confirm with your broker.
Inventory Hero
Price your next PO on today's tariffs
Duty and tariffs move between orders, and a rate change can quietly erase a product's margin. Inventory Hero folds customs costs into landed cost per SKU and flags when a product's true cost has drifted, so your next purchase order is priced on what importing costs now, not last shipment's rate.
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