Anti-Dumping Duty Calculator

Behind the number

Anti-dumping duty is an additional duty imposed on goods sold into a market below their normal value, calculated to offset the dumping margin. It applies by product, by exporting country, and frequently by individual producer, with different rates for named companies and an "all others" rate for everyone else.

Countervailing duty works the same way but offsets subsidies rather than pricing. The two can apply to the same goods simultaneously, and both sit on top of the ordinary duty.

A real example

The $18,000 shipment at an ordinary 6.5% pays $1,170. Now an anti-dumping order applies with a named-producer rate of 22% and an all-others rate of 154%.

Buying from the named producer: $1,170 + $3,960 = $5,130. Buying from an unlisted producer in the same country: $1,170 + $27,720 = $28,890, on goods worth $18,000.

That gap is not unusual. All-others rates in the hundreds of percent are common and are designed to be prohibitive, which means the specific factory matters more than the country, and a supplier switching production between facilities can change the rate without telling you.

The usual mistakes

Anti-dumping duties are frequently applied retroactively to entries made after a preliminary determination, sometimes before the importer knew a case existed. Goods already ordered and in transit can attract a duty that did not exist when the order was placed.

Cash deposits are also provisional rather than final. The rate is set at entry and reconciled later after administrative review, which can result in a bill years afterwards for the difference, a liability that sits on the importer indefinitely.

Using the result

Check whether any order covers your commodity and origin before sourcing, not after. These orders are published and searchable, and the check takes minutes against a liability that can exceed the value of the goods.

Then get the specific producer's rate in writing and verify the goods actually come from that producer. Certificates of origin naming a company with a favourable rate, covering goods made elsewhere, are a well-known evasion pattern and the importer carries the liability.

Scope, circumvention and why they matter

The scope of an order defines exactly which products are covered, and scope disputes are common because the boundary is rarely obvious. A product that seems clearly outside can be ruled within it, retroactively, which is why scope rulings exist and are worth requesting where there is genuine doubt.

Circumvention findings extend an order to goods routed through a third country or modified slightly to fall outside the description. Authorities pursue these actively, and a supply chain built on a technicality is a supply chain with a deadline.

For an importer, the practical position is that anti-dumping exposure is the single largest tail risk in sourcing, because it is retroactive, unbounded and outside your control. Diversifying suppliers across countries, even at a small cost premium. Is genuine insurance rather than caution, and it is the response most businesses only adopt after being caught once.

Anti-dumping duties are product and origin specific and they can be very large, occasionally exceeding the value of the goods. They also apply retrospectively in some investigations, which means an importer can face a bill on consignments that cleared months earlier. Checking whether a measure is in force, or under investigation, before committing to a supplier is the only reliable protection.