Customs Duty

Customs duty is a financial obligation imposed on goods when they enter (import) or exit (export) a country’s customs territory, with economic effects and revenue generation for public. This duty arises at the moment goods are presented to customs and is regulated under Law No. 4458 on Customs. According to Article 3/8-a of Law No. 4458 Law, it encompasses all taxes applied during import and export. These include Value Added Tax (VAT), Special Consumption Tax (SCT), Anti-Dumping Duty, Anti-Subsidy Duty, Additional Customs Duty, and various other supplementary financial obligations like.

Customs duties are not governed by the Tax Procedure Law (VUK) but directly by the Customs Law and regulations and circulars issued under it. This distinction necessitates a separate procedural regime for customs duties, distinct from general tax systems. Furthermore, in line with harmonization efforts with the European Union, customs practices have been aligned with GATT and WTO standards.

Historical and Economic Background of Customs Duty

Customs duties have been one of the primary sources of state revenue since ancient times and have served both fiscal and protective functions throughout the process of historical evolution. In the Ottoman Empire, indirect taxes such as “bac” and “avârız” can be considered historical precursors to modern customs duties. During the Republican era, customs policies were restructured to protect national industry and ensure state revenues. With Türkiye’s accession to the Customs Union with the European Union in 1996, together, these duties have increasingly taken on the character of an instrument of external trade policy.

Economically, customs duties support domestic production by increasing the prices of imported goods. However, this may negatively affect consumer welfare. They also have a stimulative effect on production and employment. Additionally, the revenue generated through these duties can be used to finance public services.

Elements and Taxation Process of Customs Duty

Customs duty arises legally when the taxable event occurs: the presentation of goods to customs, their declaration, and their placement under a customs regime. The most common regime is “release for free circulation,” i.e., import. During declaration, a customs declaration form and required documents documents are submitted. Customs duty is calculated based on tariff classification, value, and origin as indicated in these documents.

The taxation process can be outlined as follows: (1) Declaration: Information provided by the declarant to customs. (2) Assessment: Calculation of the duty by the customs authority. (3) Notification: Communication of the assessed duty to the taxpayer. (4) Assessment Finalization: The point at which the notified duty becomes definitive. (5) Collection: The actual payment of the duty.

Customs Value: Determination of the Tax Base

The basis for customs duty is the customs value of the goods. According to the WTO Agreement on Implementation of Article VII of GATT substance, this value is primarily the transaction price—the price actually paid or payable for the imported goods. However, the accuracy of this price is assessed in light of factors such as related-party relationships and partial transfer of the price.

In cases where the transaction price cannot be determined, alternative methods are applied:

• Determination based on the value of identical or similar goods,
• Calculation based on production costs,
• As a last resort, a reasonable determination by the authority.

The value declaration is made using the Value Declaration Form submitted with the declaration and is legally binding on the declarant. The customs authority has the power to verify the authenticity of this declared value research.

Tax Liability and Responsibility

The taxpayer for customs duty is the person or entity importing the goods. In practice, customs brokers acting on behalf of the importer are also liable as “representatives.” Authorization may be direct or indirect. In indirect representation, the representative acts in their own name but on behalf of another, thereby assuming greater liability.

In cases of declaration errors, omission of documents, misdeclaration of origin, or non-compliance with customs regimes, both the importer and the representative are jointly and severally liable for duties, penalties, and interest. The customs authority may enforce this liability directly during the collection phase.

Assessment, Notification, and Collection Process

Assessment of the duty becomes definitive upon notification to the taxpayer following the customs authority’s assessment. Notification is made in writing, and the declarant is granted a 10-day day period for payment. If payment is not made, a late payment surcharge is applied, and the duty, now classified as a public claim, is pursued in accordance with the Law on the Collection Procedure of Public Receivables.

For goods held at customs or in cases where the duty has not yet been finalized, a “security” mechanism is applied. This security may take the form of cash, a bank guarantee, or treasury bonds. This ensures that the authority’s claim is secured even as the goods are released.