How is import duty calculated?

Duty is the customs value multiplied by the duty rate. Adding that duty and any brokerage, handling, or processing fees to the customs value gives the landed cost.

What is the customs value?

Customs value is the price paid for the goods plus certain adjustments, such as international shipping and insurance, depending on the destination country's rules.

Are import VAT, sales tax, and shipping included?

No. This calculator covers duty and optional processing fees only. Import VAT or sales tax and the shipping quote are separate costs.

Do free-trade agreements change the rate?

Yes. Preferential trade programs can reduce or eliminate duty for qualifying goods, so confirm the correct rate with customs or your broker.

A tariff, or import duty, is a tax charged by customs on imported goods, normally calculated as a percentage of the customs value.

Formula: duty = customs value × duty rate; landed cost = customs value + duty + fees

Example: $1,000 × 10% = $100 duty; $1,000 + $100 + $25 = $1,125 landed cost

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计算器: Tariff & Import Duty.

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02 / 答案

Customs value

Duty rate

Additional fees (optional)

Import duty

Duty due

US$100.00USD

$1,000 × 10% = $100 duty; landed cost $1,100

明细

Customs value$1,000

Duty rate10%

Additional fees$0

Total landed cost$1,100

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Canonical URL: https://mathify.one/zh/finance/tariff

Cite as: Mathify. (n.d.). 计算器: Tariff & Import Duty. https://mathify.one/zh/finance/tariff

Use Cases

Costing an import

Add duty and fees to the purchase price before deciding whether to buy overseas.

Example: A $1,000 customs value at 10% duty plus $25 in fees lands at $1,125.

Comparing suppliers

Check whether a cheaper overseas price still wins after duty and fees.

Example: A $900 part at 15% duty costs $1,035 landed, more than a $1,020 local part.

Setting retail prices

Use the landed cost as the basis for margin and pricing decisions.

Example: A 30% margin on a $1,125 landed cost implies a $1,607 selling price.

Frequently Asked Questions

How is import duty calculated?: Duty is the customs value multiplied by the duty rate. Adding that duty and any brokerage, handling, or processing fees to the customs value gives the landed cost.
What is the customs value?: Customs value is the price paid for the goods plus certain adjustments, such as international shipping and insurance, depending on the destination country's rules.
Are import VAT, sales tax, and shipping included?: No. This calculator covers duty and optional processing fees only. Import VAT or sales tax and the shipping quote are separate costs.
Do free-trade agreements change the rate?: Yes. Preferential trade programs can reduce or eliminate duty for qualifying goods, so confirm the correct rate with customs or your broker.

Tips & Common Mistakes

Tips

Confirm the correct HS code, because it sets the duty rate.
Include international shipping and insurance in the customs value where required.
Ask your broker about merchandise-processing fees, which are common on US imports.
Check whether a free-trade agreement or de minimis threshold applies to your shipment.

Common Mistakes to Avoid

Applying the duty rate to the retail price instead of the customs value.
Forgetting that duty is calculated before import VAT or sales tax in many countries.
Ignoring per-shipment processing fees that are separate from the ad valorem duty.
Using a general rate when a preferential rate is available for the goods.

Last updated: September 11, 2026