Customs Duty Calculator

What this Customs Duty Calculator does

Estimate import duty, merchandise processing fees (MPF), and harbor taxes on landed goods. The tool is part of FBA Master's free Amazon seller resource collection, covering amazon fba shipping, freight and packaging calculations. It is intended to help you organize the inputs and understand the result before taking action in Seller Central, with a supplier, or in your business records.

Related search topics include customs duty calculator, customs duty calculator online, free customs duty calculator, Amazon seller customs duty calculator. Choose the inputs that match your own marketplace and business situation rather than relying on default examples.

How to use the Customs Duty Calculator

Enter manufacturing invoice total and applicable duty rates.
Review total US Customs duties payable upon arrival at port.

Before using the result, check that every amount, percentage, unit and date matches the source information you intend to analyze.

Inputs used by this tool

The calculator displays the following fields. Your exact inputs depend on the selected tool and its available options.

Commercial Invoice Value ($)
Base HTS Duty Rate (%)
Section 301 China Tariff (%)

Calculation method and formula

The tool's registered calculation explanation is:

Import Duty = Invoice Value * (Base Duty Rate % + Section 301 Tariff %) + Merchandise Processing Fee (MPF: 0.3464%).

The result depends on the values you enter and the assumptions built into the tool. Where marketplace fees, carrier prices or tax rules apply, confirm the latest official figures before relying on the estimate.

Practical tips before you use the result

Use current figures from your Seller Central reports, supplier quotation, invoice or other primary records.
Keep the units consistent. Do not mix inches with centimetres, kilograms with pounds, or one currency with another.
Test more than one realistic scenario when comparing prices, costs or campaign settings.
Save or record the result you need before closing or refreshing the page.
Look up the exact 10-digit Harmonized Tariff Schedule (HTS) code on the USITC database to confirm whether Section 301 List 3 or List 4A tariffs apply to your SKU.
Do not artificially undervalue commercial invoices; U.S. Customs and Border Protection (CBP) imposes severe penalties and shipment seizures for undervaluation fraud.

Use confirmed carton dimensions, gross weights and freight quotations. Carriers and fulfillment networks apply their own measurement and billing rules.

Worked example: Customs Duty Calculator

Sample inputs:

Commercial Invoice Value ($): $15000.00
Base HTS Duty Rate (%): 3.5%
Section 301 China Tariff (%): 25%

Calculation:

Total Customs Duty = $4326.96
Section 301 = $3750.00
Base Duty = $525.00
MPF = $51.96

Result: Total Customs Duty: $4326.96, Section 301: $3750.00, Base Duty: $525.00, MPF: $51.96

Executing the tool logic with these inputs yields Total Customs Duty: $4326.96, confirming operational profitability and compliance.

Tool disclaimer

This Customs Duty Calculator is provided for educational and planning purposes. Results depend on the information you enter and the assumptions shown by the tool. Amazon fees, marketplace rules, tax rates, shipping charges and regulatory requirements change. Verify current figures with Amazon Seller Central, the relevant tax authority, carrier or qualified professional before making financial, tax, legal or compliance decisions. FBA Master does not guarantee accuracy for every business situation or any commercial outcome.

Frequently asked questions

What is the MPF fee in US Customs?

The Merchandise Processing Fee is an ad valorem fee of 0.3464% on formal customs entries (minimum $31.67, maximum $614.35).

How do I use the Customs Duty Calculator?

Open the calculator on this page, enter the values requested by its fields, and review the calculated result. Estimate import duty, merchandise processing fees (MPF), and harbor taxes on landed goods.

Does the Customs Duty Calculator send my entries to a server?

The calculator logic runs in your browser using the values you enter. Do not enter confidential information into a shared or public device, and save any results you need before closing or refreshing the page.

What does the Customs Duty Calculator calculate?

Estimate import duty, merchandise processing fees (MPF), and harbor taxes on landed goods. The tool uses the calculation logic described in its formula section and displays the result from your inputs.

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