Additional Customs Tax Assessment in Turkey: Objection and Lawsuit Guide for Importers — 2026 Current Guide

Has Turkish customs issued an additional tax assessment? Learn the 15-day objection period, possible settlement, tax-court proceedings and importer defences in 2026.

Turkish customs may issue an additional tax assessment when it concludes that duties and other import taxes were underpaid. The assessment may arise during clearance or through a post-clearance audit conducted after the goods have been released. It may also be accompanied by an administrative fine, interest or another financial decision.

Importers should act immediately because the administrative objection period is generally short. Paying the assessment, requesting settlement and filing an objection can have different legal consequences. The importer must review each notified document separately and avoid assuming that an objection against the tax assessment automatically covers an accompanying penalty.

What Is an Additional Customs Tax Assessment?

An additional assessment is a customs decision claiming that the importer paid less than the legally required amount. Customs recalculates the duties and notifies the importer of the difference.

The calculation may involve customs duty, import value-added tax, additional customs duty, anti-dumping duty, safeguard measures or other financial obligations collected on importation. The applicable charges depend on the goods, origin, tariff classification and transaction date.

An additional assessment is different from an administrative fine. Customs may issue both decisions in the same investigation, but they retain separate legal characteristics. The importer should verify the amounts, notification dates and objection information for each document.

Why Does Customs Issue an Additional Assessment?

Tariff-classification disputes are a common reason. Customs may conclude that the declared classification was incorrect and that the goods were subject to a higher duty rate or additional trade measure.

Customs valuation disputes can also produce substantial assessments. The administration may question invoice prices, discounts, related-party transactions, royalties, licence fees, assists, commissions, freight or insurance expenses.

Origin disputes may arise where customs rejects a preferential-origin certificate or alleges that the declared country of origin is incorrect. This can result in the loss of preferential treatment or the application of anti-dumping and safeguard duties.

Post-clearance audits may examine several years of import transactions. A single interpretation involving classification, value or origin can therefore affect hundreds of declarations and create a major financial exposure.

What Should the Importer Check First?

The importer should identify the declarations, goods and periods covered by the assessment. It should compare the customs calculation with the original declaration and determine which factual or legal finding created the difference.

The complete file should include the assessment decision, calculation table, inspection or audit report, customs declarations, invoices, transport records and technical documents. Where origin is disputed, certificates and supplier records should also be collected.

The importer must record the notification date. The objection period generally begins from legally effective notification, not from the date on which management informally learns about the assessment.

If several decisions were notified, each should be listed separately. A tax assessment, penalty and related customs decision may require distinct objections even when they arise from the same audit.

What Is the Objection Period?

Under the general customs objection procedure, an importer may object to notified customs duties, penalties and administrative decisions within 15 days from notification. The objection is submitted to the superior customs authority or, where no superior authority exists, to the same authority.

The objection petition should identify the contested decision, declaration numbers, disputed amount and legal grounds. Supporting documents and calculations should be attached.

Submitting a general statement that the assessment is incorrect may not protect every argument effectively. Classification, value, origin, limitation and procedural objections should be presented clearly.

An objection filed with the wrong authority within the prescribed period may be forwarded to the competent authority under the customs procedure. Nevertheless, the importer should identify the proper authority from the beginning to prevent delay.

Is the Administrative Objection Mandatory Before Filing a Lawsuit?

In customs disputes, the administrative objection procedure should generally be completed before judicial proceedings are commenced. Filing a lawsuit directly against the initial assessment may create a procedural problem.

The importer should wait for the authority’s express rejection or determine the legal consequences of its failure to respond within the applicable period. The judicial filing period must then be calculated carefully.

Informal meetings, requests for explanation and correspondence with audit officials do not replace the formal objection. They should not be allowed to consume the 15-day period.

Can the Importer Request Customs Settlement?

Settlement may be available for eligible customs duties and administrative fines if the statutory requirements are satisfied. A settlement request is generally made within the same short period before the ordinary objection process is completed.

The importer should compare settlement with litigation before applying. Settlement may provide faster resolution and reduce uncertainty, but an agreed amount usually limits the ability to continue disputing the settled liability.

Not every assessment is eligible. Cases connected with smuggling allegations and other statutory exclusions may fall outside the settlement procedure.

The effect of a settlement request on objection and lawsuit periods should be calculated precisely. If settlement fails, the remaining time may be very short.

Does an Objection Suspend Payment?

A timely objection may affect the payment period for the disputed customs assessment under the applicable customs rules. However, the importer should not assume that every connected debt, penalty or collection measure is suspended in the same way.

The company should obtain a written account statement and determine whether the administration has initiated collection, requested security or imposed another restriction.

If goods remain at customs, the importer may also need to decide whether paying or securing the disputed amount is commercially preferable to allowing storage and demurrage charges to increase. Payment does not always eliminate the right to challenge, but it should be made under a properly assessed legal strategy.

How Can a Tariff-Classification Assessment Be Challenged?

The importer should establish the goods’ objective characteristics at the time of importation. Product composition, technical function, degree of processing, dimensions and intended use may all be relevant.

Useful evidence may include catalogues, technical drawings, samples, laboratory analyses and manufacturer statements. Commercial product names are often insufficient because classification follows tariff rules rather than marketing descriptions.

If customs relies on a laboratory result, the importer should examine whether the sample represented the declared goods and whether the correct testing method was used. Any available technical objection or second-analysis procedure must be pursued within its own period.

Consistent treatment in earlier declarations may support the importer’s position but does not automatically bind customs. A binding classification decision offers stronger protection when it accurately covers the imported product and relevant period.

How Can a Customs Valuation Assessment Be Challenged?

The importer should demonstrate the commercial reality of the declared transaction value. The purchase agreement, invoices, bank transfers, accounting records and correspondence should be consistent.

Where buyer and seller are related, customs may examine whether the relationship influenced the price. Transfer-pricing reports, comparable transactions and evidence of pricing methods may become relevant.

Royalties, licence payments, engineering fees, software and services should be analysed individually. Not every payment to the supplier or a related party must automatically be added to customs value. The contractual conditions and connection with the imported goods are decisive.

Discounts and rebates should be documented through agreements existing at the relevant time. Retrospective or poorly documented reductions may face greater scrutiny.

How Can an Origin-Based Assessment Be Challenged?

The importer should determine whether customs disputes preferential origin, non-preferential origin or the authenticity of the certificate. These issues may involve different evidence and procedures.

Certificates alone may be insufficient if customs questions the production process or supplier declaration. Manufacturing records, input information, transport documents and direct-transport evidence may be required.

If customs seeks verification from a foreign authority, the importer should coordinate with the supplier and ensure that requests are answered accurately and on time. Failure by the exporter to cooperate can cause the importer to lose preferential treatment.

An incorrect origin finding may also trigger anti-dumping or additional customs duties, significantly increasing the financial exposure.

Can Customs Assess Duties After the Goods Have Been Released?

Yes. Customs may conduct post-clearance audits and review declarations after release. The importer’s accounting records, contracts, payment information and commercial correspondence may be examined.

The administration must nevertheless comply with statutory time limits and procedural requirements. The importer should calculate the relevant limitation period separately for every declaration and tax category.

Allegations involving incomplete or misleading information may affect the limitation analysis. The company should not assume that one general period resolves every assessment.

Can a Penalty Be Challenged Separately?

Yes. The tax difference and administrative penalty should be examined independently. Even where additional duties are legally payable, the penalty may still be challenged on separate grounds.

Relevant issues may include lack of fault where legally significant, incorrect penalty classification, duplication of penalties, defective notification and failure to satisfy statutory elements.

The objection petition should expressly identify the penalty decision and amount. Challenging only the additional tax assessment may not automatically protect the importer against a separately notified penalty.

How Is a Lawsuit Filed?

After the administrative objection process is completed, the importer may bring proceedings before the competent administrative judiciary. Additional customs tax assessments are generally reviewed by the competent tax court, although jurisdiction should be confirmed from the legal character of each decision.

The petition should identify the assessment, objection, rejection decision and disputed amount. It should explain classification, valuation, origin, limitation and procedural arguments in an organised manner.

The complete administrative file, expert evidence and calculation tables should be submitted. Foreign-language documents may require certified translation.

Where collection or another enforcement measure creates urgent risk, the importer should assess whether interim judicial protection is required. Filing consequences can vary according to the nature of the dispute.

Can Paid Customs Taxes Be Refunded?

If the assessment is annulled or customs otherwise accepts the importer’s position, repayment of the overpaid amount may be requested under the applicable procedure.

The company should preserve payment receipts and identify the declaration and tax category to which each payment relates. Interest and additional financial claims require separate legal examination.

A refund claim should not be confused with compensation for wider commercial losses. Recovery of the tax amount and damages caused by an unlawful decision may follow different conditions and procedures.

What Evidence Is Most Important?

The evidence depends on the assessment ground. Classification cases require technical documentation, while valuation cases require contractual, banking and accounting records. Origin cases require supply-chain and production evidence.

The importer should also preserve electronic customs records, notification documents, audit correspondence and internal compliance reports. A declaration-by-declaration calculation can reveal duplicated amounts or periods outside the permissible assessment window.

Fırat Fesih Kaya Law Office and Lawyer Fırat Fesih Kaya assist foreign importers with additional customs assessments, administrative objections, settlement evaluations and tax-court proceedings.

Additional Customs Assessments Under the 2026 Framework

In 2026, importers must continue to monitor current tariff measures, product-specific duties, origin rules and electronic customs notifications. A change in classification or trade-policy measure can create substantial exposure across repeated imports.

Foreign companies should conduct periodic customs audits before an official inspection begins. Contracts, invoices, royalty arrangements and classification practices should be reviewed consistently across customs, tax and accounting records.

Frequently Asked Questions (FAQ)

1. How long does an importer have to object?

The general customs objection period is 15 days from legally effective notification.

2. Can the importer file a lawsuit without objecting first?

The customs administrative objection procedure should generally be completed before judicial proceedings.

3. Is an additional assessment the same as a customs penalty?

No. Customs duties and administrative fines may arise from the same facts but should be challenged separately.

4. Can the importer request settlement?

Potentially, if the assessment is eligible and the request is submitted within the applicable period.

5. Does an objection suspend payment?

A timely objection may affect the payment period, but every connected liability and collection measure should be checked separately.

6. Can customs reassess duties after release?

Yes. Post-clearance audits may result in additional assessments, subject to applicable procedural and limitation rules.

7. Can a related-party invoice be accepted?

Yes, if the importer demonstrates that the relationship did not improperly influence the price and the declared value satisfies customs rules.

8. Can a rejected origin certificate be defended?

Potentially. Supplier records, manufacturing information and verification from the issuing authority may be required.

9. Can paid additional duties be recovered?

Potentially, if the assessment is cancelled or annulled and the importer follows the applicable refund procedure.

10. Which court reviews an additional customs assessment?

The competent tax court generally reviews additional customs tax assessments after completion of the administrative objection procedure, but jurisdiction must be confirmed for each decision.

This article is intended for general informational purposes only. To avoid any loss of rights, we recommend consulting your lawyer regarding your specific circumstances.

Legal Support

Fırat Fesih Kaya Law Office and Lawyer Fırat Fesih Kaya provide professional legal assistance to clients in Turkey and abroad in additional customs assessments, administrative objections, settlement proceedings and tax litigation.

Mobile: +90 532 769 22 22
Office: +90 312 434 22 22
Email: info@firatfesihkaya.av.tr
Address: Mevlana Boulevard No: 221, Yıldırım Tower, Balgat, Çankaya / Ankara, Turkey