CONTENTS
- 1. Anti-Dumping Investigation | Overview and Significance of the System

- - The Concept of Dumping
- 2. Anti-Dumping Investigation | Standing to File and Requirements for Initiating an Investigation

- - Existence of Dumped Imports
- - Material Injury or Threat of Injury
- - Causal Link Between Dumped Imports and Industry Injury
- 3. Anti-Dumping Investigation | Flow of the Investigation Procedure

- - Preliminary Investigation
- - Main Investigation
- 4. Anti-Dumping Investigation | Structure of Determinations and Measures

- - Structure of Measures by Stage
- - Review and Period of Application
- 5. Anti-Dumping Investigations | Key Risks Companies Face and How to Respond

- - Prevention in Advance and Responding to an Investigation
1. Anti-Dumping Investigation | Overview and Significance of the System
An anti-dumping investigation is a system under which, where foreign goods are imported at prices below the normal domestic market price of the supplying country and cause material injury to a domestic industry or threaten to do so, the matter is investigated and an anti-dumping duty is imposed within the range of the difference between the normal value and the export price (the dumping margin).
This is a leading trade remedy recognized in international trade, serving as an institutional mechanism to protect domestic industry and maintain a fair competitive order.
Internationally, it is based on Article VI of GATT 1994 and the Anti-Dumping Agreement, and in Korea the system is operated mainly under the Customs Act.
The Concept of Dumping
Dumping refers to a situation in which the same product is sold abroad at a price lower than in the home market, at the same time and under the same conditions.
In economic terms, it is understood as "price discrimination between international markets," and it occurs when the exporting country's market and the foreign market are separated.
In other words, this structure forms only where there is no possibility that the goods will be re-imported into the producer's home market, allowing sales abroad at a lower price.
In legal terms, dumping is found where the export price is below the normal value, and the normal value is generally calculated based on the transaction price of like goods within the exporting country.
2. Anti-Dumping Investigation | Standing to File and Requirements for Initiating an Investigation

An anti-dumping investigation is permitted only for parties with a certain interest.
Under Article 51 of the Customs Act, a person with an interest in a domestic industry that has suffered material injury due to dumping, or the competent minister overseeing that industry, may apply to initiate an investigation.
This includes domestic producer associations, trade groups, and related companies.
For an investigation to be initiated, the mere fact that prices are low is not enough; all three of the following requirements must be met.
Existence of Dumped Imports
First, the existence of dumped imports.
This means cases in which the export price is below the normal value, and the normal value is calculated by considering, in combination, the transaction price within the exporting country, the export price to a third country, or a price based on the cost of production.
Material Injury or Threat of Injury
Second, there must be material injury or a threat of injury to a domestic industry.
This is assessed through various economic indicators such as output, sales volume, market share, profit, and employment.
Causal Link Between Dumped Imports and Industry Injury
Third, a causal link must be established between the dumped imports and the industry injury.
It must be shown that the injury resulted from the dumped imports, beyond a general market downturn.
3. Anti-Dumping Investigation | Flow of the Investigation Procedure
An anti-dumping investigation proceeds in stages, centered on the Trade Commission, and is divided into a preliminary investigation and a main investigation.
At the initiation stage, whether to initiate an investigation is decided within two months from the date the application is received.
Once the investigation is initiated, the goods subject to investigation, the supplying country, and the investigation period are confirmed and publicly announced.
Preliminary Investigation
In the preliminary investigation that follows, the existence of dumping and the possibility of industry injury are assessed for the first time.
In this process, questionnaires are sent to exporters, importers, domestic producers, and others, and the submitted materials are used to analyze prices, costs, transaction structures, and similar matters.
A preliminary investigation is generally completed within three months and may be extended if necessary.
Main Investigation
At the main investigation stage, more detailed verification takes place.
On-site inspections, public hearings, and reviews of additional materials are conducted, and interested parties may submit written opinions or take part in the procedure.
An on-site investigation, in particular, is a procedure for directly examining a company's accounting records and transaction structure, and the final duty rate can vary greatly depending on the level of response.
4. Anti-Dumping Investigation | Structure of Determinations and Measures

The determination in an anti-dumping investigation leads to immediate measures.
This process is divided broadly into provisional measures, the imposition of a final duty, and price undertakings.
Structure of Measures by Stage
Category | Details | Impact on the Company |
Provisional measures | A provisional duty or security is imposed when dumping and injury are recognized in the preliminary determination | Cost burden arises even during the investigation |
Final measures | An anti-dumping duty is imposed within the range of the dumping margin | Export price competitiveness declines directly |
Price undertaking | The exporter offers to raise prices or suspend exports | Trade terms are restricted instead of a duty |
Where dumping and industry injury are recognized in the preliminary determination, a provisional duty may be imposed even before the investigation ends, and this has an immediate effect on a company's transaction structure.
If dumping is recognized in the final determination, the government imposes an anti-dumping duty within the range of the dumping margin, and this is a measure imposed in addition to and separately from ordinary tariffs.
If, on the other hand, the exporter offers an undertaking to raise prices or limit exports, accepting it may end the investigation itself without the imposition of a duty.
Review and Period of Application
An anti-dumping duty applies only for a set period and may be readjusted as circumstances change.
Category | Details |
Review | An adjustment of the duty rate may be requested when the dumping or industry injury situation changes |
Investigation period | Completed within 6 months after the review begins (extendable by up to 4 months) |
Period of application | In principle, lapses after 5 years (extendable) |
In other words, an anti-dumping duty is not a one-time measure but a regulation that is continually reviewed, which calls for a long-term response strategy.
5. Anti-Dumping Investigations | Key Risks Companies Face and How to Respond
An anti-dumping investigation reaches well beyond higher tariffs and can affect a company's entire overseas operation.
∙ Reduced sales in, or exclusion from, a particular national market
∙ High tariff rates resulting from a failed response to an on-site verification
∙ Potential escalation into a trade dispute between governments
How a company responds during the investigation often becomes the decisive factor in the final tariff rate.
Prevention in Advance and Responding to an Investigation
Responding effectively once an anti-dumping investigation has begun matters, but the preparation done beforehand matters even more.
As a preventive step, a company should examine the gap between its export prices and normal value, organize its affiliated-party transactions and transfer pricing structure, and keep its cost and accounting records in good order.
It also helps to monitor anti-dumping trends in major export markets on an ongoing basis.
Once an investigation opens, each stage calls for a deliberate strategy, including responding to questionnaires, submitting data, handling on-site verification, and taking part in hearings.
The accuracy and consistency of the submitted data bear directly on the calculated tariff rate, so professional review is warranted.
Because this is a serious trade risk that can limit a company's access to the market itself, setting the direction of the response in the early stages can shape the outcome.
At Daeryun Law Firm, attorneys in international trade, customs, and trade remedies work together to provide comprehensive legal services, from responding to an anti-dumping investigation through administrative and international dispute proceedings.
If you need help responding to an investigation or related advice, you may reach out at any time through 🔗scheduling a consultation with a customs attorney to entrust us with your matter.












