How do you calculate import duty?

Import duty = tariff rate × customs value. If the customs value is $54,500 and the duty rate is 6.5%, the duty is $3,542.50. The tariff rate comes from your goods' HS/HTS classification. Most countries then add an import tax (VAT or GST) and fees on top.

Does VAT or GST apply to imports?

In most countries, yes — and it's usually the bigger charge. Import VAT or GST is typically assessed on a duty-inclusive base (customs value + duty). On a $54,500 shipment with 6.5% duty and 20% VAT, the VAT alone is about $11,608.50, far exceeding the $3,542.50 of duty. The US is an exception: it has no federal VAT on imports, so charges are mainly duty plus fees.

What is the effective duty rate?

The effective rate expresses every border charge — duty, tax, and fees — as a percent of the customs value, so you see the true markup. A 6.5% duty rate with fees can be an effective 7.4% in the US, but with 20% VAT on top it becomes about 28.7%. The headline duty rate rarely tells the whole story.

How do I find my import duty rate?

The duty rate is set by your goods' HS code (the Harmonized System classification), which each country extends into its own tariff schedule — the HTS in the US. Classify the goods to the correct code, look up the rate in the destination country's schedule, and check for trade-agreement preferences or extra duties before you calculate.

How to Calculate Import Duty

The core is simple: duty = tariff rate × customs value. The total at the border usually isn’t — import VAT or GST and fees pile on top, and in a lot of countries the tax is the biggest line of all. Here’s the calculation, worked for a US importer and a VAT-country importer, plus the tax-base trap and the effective rate that tells you the real cost.

Step 1: duty = rate × customs value

Duty is the tariff rate applied to the customs value — not the invoice, not the landed cost. On a $54,500 customs value at a 6.5% rate, the duty is $3,542.50. The rate itself comes from your goods’ HS code (the Harmonized System classification), which each country extends into its own tariff schedule — the HTS in the US. Classify first, then look up the rate; a wrong code means a wrong duty.

Step 2: the import tax (VAT / GST) is usually the bigger number

Most countries charge an import consumption tax — VAT or GST — on top of the duty, and it typically dwarfs it. Take the same $54,500 shipment at 6.5% duty and compare a US importer (no federal VAT, just fees) with a 20% VAT country:

Charge	US (no VAT)	20% VAT country
Duty (6.5%)	$3,542.50	$3,542.50
Import VAT (20%)	—	$11,608.50
Fees	$500.00	$500.00
Total charges	$4,042.50	$15,651.00
Effective rate	7.4%	28.7%

Same goods, same duty rate — but a 7.4% border cost in the US versus 28.7% where VAT applies. If you only budget the duty rate, you can be off by a factor of four.

Importers watch the duty rate. It’s the tax they forgot to model that blows up the landed cost.

The tax-base trap: tax on a tax

Where VAT applies, it’s usually charged on a duty-inclusive base (customs value + duty), which means you pay tax on the duty itself. In the example, 20% on the duty-inclusive $58,042.50 is $11,608.50; on the customs value alone it would be $10,900 — a $708.50 difference from the base alone. Know which base your destination uses before you quote a landed cost.

Step 3: the fees

Smaller but real: brokerage, and in the US the merchandise processing fee (MPF) and, on ocean shipments, the harbor maintenance fee (HMF). They’re flat or percentage add-ons that belong in the total — a few hundred dollars here, but they’re part of the effective rate.

The effective rate, and where it goes

The number to carry forward is the effective rate — every charge as a percent of customs value — because that’s the true markup at the border. From here the duty (and tax, where it applies) feeds the landed cost, which is what you actually price against. Get the rate, the tax base, and the fees right, and the landed cost is right.