False Invoice Allegations in Turkish Customs Investigations: Legal Consequences – 2026 Updated Guide

Accused of using a false or undervalued invoice at Turkish customs? Learn the consequences for foreign companies, importers and directors, including customs penalties, Law No. 5607 investigations, seizure, confiscation and defense strategies.

A false invoice allegation in a Turkish customs investigation can turn an ordinary import transaction into a serious customs and criminal-law dispute. Turkish customs authorities may allege that the invoice submitted with an import declaration does not reflect the actual transaction price, that a second invoice exists, that the description or quantity of the goods was manipulated, or that the invoice was deliberately prepared to reduce customs duties.

For foreign companies, the distinction between an incorrect invoice, an undervalued customs declaration and an intentionally false document is critical. Not every discrepancy automatically constitutes smuggling or fraud. Depending on the facts, an invoice problem may result in additional customs duties and administrative penalties under Customs Law No. 4458, while more serious allegations may lead to a criminal investigation under Anti-Smuggling Law No. 5607 and related criminal legislation.

The Ministry of Trade confirms that customs value is determined under Customs Law No. 4458 and the Customs Regulation, with the transaction-value method serving as the starting point before alternative valuation methods are considered where applicable. (Ticaret Bakanlığı)

Accordingly, when customs authorities challenge an invoice, the first question should not simply be whether two figures are different. The company must determine why the difference exists, which amount legally constitutes the customs value, who prepared the document and whether there is evidence of intentional deception.

What Is a False Invoice Allegation in Turkish Customs?

A false invoice allegation generally arises when authorities believe that an invoice presented for customs purposes does not accurately represent the underlying commercial transaction.

This may involve allegations that the importer declared a lower purchase price than the amount actually paid, submitted a fabricated commercial invoice, concealed a second invoice, changed the description of the goods, manipulated quantities or used documentation that does not correspond to the actual seller or transaction.

However, customs valuation is more complicated than simply looking at the number printed on an invoice.

The Ministry of Trade explains that Turkey applies six customs valuation methods in sequence, beginning with the transaction-value method and followed, where necessary, by the transaction value of identical goods, similar goods, deductive value, computed value and fallback methods. (Ticaret Bakanlığı)

Therefore, an invoice dispute and a false-invoice criminal allegation should not automatically be treated as the same thing.

Is an Incorrect Invoice Automatically a Criminal Offence?

No.

This is one of the most important distinctions for foreign companies.

A commercial invoice may contain a mistake without being fraudulent. Currency may be entered incorrectly. Freight may be allocated incorrectly. A discount may be misunderstood. A provisional invoice may be confused with the final commercial invoice.

Similarly, customs authorities may disagree with the declared customs value even though the invoice itself is genuine.

Where imported goods subject to ad valorem duties are found to have been declared below the value determined under the customs valuation provisions, the Ministry states that Article 234(1)(b) of Customs Law No. 4458 can result in collection of the additional import duties together with an administrative fine equal to three times the tax difference, subject to the specific statutory exceptions described by the Ministry. The Ministry expressly notes that the provisions of Law No. 5607 remain reserved. (Ticaret Bakanlığı)

This demonstrates that an undervaluation issue can have both an administrative customs dimension and, in sufficiently serious circumstances, a potential criminal dimension.

What Is the Difference Between Undervaluation and a False Invoice?

Undervaluation means that the customs value declared to Turkish customs is lower than the value that should legally have been declared.

A false invoice allegation goes further.

Authorities may allege that a document itself was deliberately fabricated or manipulated to create an artificial customs value or disguise the true commercial transaction.

For example, assume that a Turkish importer actually purchases machinery for USD 500,000 but customs authorities allege that a separate USD 250,000 invoice was intentionally created solely for customs clearance.

That is fundamentally different from a dispute over whether a genuine USD 500,000 invoice should also have included a particular royalty or another statutory addition when calculating customs value.

The first scenario can raise serious fraud and smuggling concerns. The second may be a sophisticated customs valuation dispute.

Can Using Two Invoices Lead to a Smuggling Investigation?

Potentially, yes.

The existence of two invoices for the same goods is likely to attract significant scrutiny, particularly where the lower invoice was presented to customs and the higher invoice reflects the actual commercial payment.

The Ministry of Trade has publicly reported an enforcement case in which imported goods were allegedly supported by two different invoices. According to the Ministry, the actual invoice value was USD 99,500 while a USD 36,000 invoice was allegedly used for the customs declaration. Goods were seized under Law No. 5607 and two suspects were referred for criminal proceedings. (Ticaret Bakanlığı)

This illustrates the seriousness with which Turkish authorities may treat deliberate double-invoice arrangements.

However, the existence of two documents does not by itself establish guilt. Companies sometimes legitimately use pro forma invoices, final commercial invoices, credit notes, debit notes or revised invoices.

The purpose and chronology of each document must therefore be established.

What Laws Can Apply to False Invoice Allegations?

Several bodies of Turkish law can become relevant.

Customs Law No. 4458 governs customs declarations, valuation, customs debts and administrative customs penalties.

Anti-Smuggling Law No. 5607 governs specified smuggling offences.

Criminal Procedure Code No. 5271 regulates important aspects of criminal investigations, including evidence and protective measures.

Depending on the alleged conduct, provisions concerning document forgery or other offences under Turkish criminal legislation may also require examination.

The Ministry of Trade identifies Law No. 5607, Customs Law No. 4458 and Criminal Procedure Code No. 5271 among the principal legislation governing Customs Enforcement activities. (Muhafaza)

The applicable consequences therefore depend on exactly what prosecutors allege occurred.

Can a False Invoice Lead to Additional Customs Duties?

Yes.

If authorities establish that the declared customs value was too low, they may assess additional customs duties based on the value they consider legally correct.

This can affect not only customs duty but potentially other import-related financial obligations whose calculation depends on customs value.

The underlying valuation should nevertheless be independently checked.

A criminal allegation does not automatically prove that the administration’s recalculated customs value is correct.

The company may need to challenge both the allegation of falsity and the valuation methodology used by customs.

Can an Administrative Fine Also Be Imposed?

Potentially.

As noted above, Ministry guidance states that where the declared customs value of goods subject to ad valorem import duties is found to be deficient under the applicable valuation rules, Article 234(1)(b) can result in collection of the tax difference and a fine equal to three times that difference, subject to the statutory rules and exceptions. (Ticaret Bakanlığı)

The same guidance explains that smaller quantity differences not exceeding the specified 5% threshold and deficiencies resulting from material calculation errors receive different treatment under that provision. (Ticaret Bakanlığı)

Accordingly, the reason for the discrepancy matters enormously.

Can a Foreign Company Face a Criminal Investigation?

Potentially.

Where Turkish authorities believe an invoice was deliberately falsified or used as part of conduct falling within Anti-Smuggling Law No. 5607, the matter may be referred for criminal investigation.

Foreign ownership does not prevent Turkish authorities from investigating conduct connected with imports into Turkey.

The investigation may examine the Turkish importing subsidiary, foreign seller, company executives, employees responsible for imports and the customs broker.

The key issue is the alleged involvement of each person rather than nationality alone.

Can the Goods Be Seized?

Potentially, yes.

Where goods are suspected of being connected with a smuggling offence, seizure may become part of the criminal investigation.

The Ministry’s published double-invoice enforcement example involved seizure of the imported goods under Law No. 5607. (Ticaret Bakanlığı)

Seizure, however, should be distinguished from permanent confiscation.

The legality of the seizure, continued retention of the goods and any eventual confiscation must be analyzed under the applicable statutory and criminal-procedure framework.

For businesses importing perishable or rapidly depreciating products, this issue requires particularly urgent attention.

Can Company Computers and Accounting Records Be Examined?

Potentially.

A false invoice investigation frequently requires authorities to determine whether another invoice, payment record or internal accounting entry exists.

Investigators may therefore become interested in accounting systems, bank records, e-mails, enterprise resource planning systems and communications with suppliers.

For multinational companies, evidence may exist both in Turkey and abroad.

Foreign headquarters should therefore preserve relevant documents immediately after learning of an investigation.

Deleting, modifying or recreating records can severely damage the company’s defense.

Why Are Bank Transfers Important?

Bank records can be among the strongest evidence in an invoice investigation.

Suppose customs documentation shows a purchase price of EUR 100,000 while bank records indicate that EUR 180,000 was transferred to the supplier.

Authorities will naturally investigate the EUR 80,000 difference.

But the difference may have a legitimate explanation.

It could concern another shipment, services, royalties, freight, an advance payment, settlement of an earlier invoice or another commercial obligation.

The defense should therefore reconcile invoices with payments rather than allowing authorities to assume automatically that every additional transfer represents hidden consideration for the imported goods.

What If the Invoice Was Issued by a Related Company?

Related-party transactions receive particular attention because the buyer and seller may belong to the same multinational group.

However, related-party status does not automatically make an invoice false.

Turkish customs valuation rules specifically address related-party transactions and whether the relationship influenced the transaction value.

The analysis may therefore require review of intercompany agreements, transfer-pricing documentation, accounting records and actual payment flows.

Importantly, transfer pricing and customs valuation are related but legally distinct areas. A price accepted for corporate-tax purposes should not automatically be assumed to resolve the customs valuation question.

What If the Foreign Supplier Issued the Incorrect Invoice?

This can significantly affect the factual analysis.

A Turkish importer may receive an invoice from a foreign supplier and have no role in preparing it.

If the invoice later proves incorrect, authorities should determine whether the importer knew about the error or participated in creating or using the false information.

Supplier correspondence can therefore become critical.

Purchase orders, contracts, payment instructions and e-mails may demonstrate what price the importer understood to be payable.

Where the supplier independently manipulated the documentation, the importer may have materially different defenses.

What If the Customs Broker Used the Wrong Invoice?

Customs broker involvement should be investigated carefully.

The company should establish which invoice it provided to the broker and whether any other document was available to the broker.

If the importer supplied the correct final commercial invoice but the broker accidentally uploaded an earlier pro forma invoice, the factual position differs substantially from a deliberate instruction to use a lower invoice.

The power of attorney, brokerage agreement, document-transmission records and e-mails should all be preserved.

Can a Pro Forma Invoice Cause Problems?

Yes, particularly if it is accidentally used as though it were the final commercial invoice.

Pro forma invoices can legitimately be issued before a transaction is finalized. Prices, quantities or delivery terms may later change.

If the customs declaration relies on an earlier pro forma amount while the final commercial invoice shows another figure, customs authorities may investigate the discrepancy.

The company should be able to demonstrate the commercial chronology.

Evidence showing when the final price was determined and when the importer became aware of it can be extremely important.

What About Discounts?

Legitimate commercial discounts do not automatically constitute customs fraud.

However, authorities may question whether a claimed discount actually existed or whether it was created merely to reduce customs value.

Contracts, purchase orders, correspondence, price lists and payment records should support the commercial reality of the discount.

Retroactive discounts and year-end adjustments can be particularly complicated in multinational supply arrangements and should be reviewed carefully for customs purposes.

Can Royalty Payments Create a False Invoice Allegation?

The invoice itself may be genuine while the declared customs value is still disputed because of royalty or licence payments.

The Ministry of Trade’s customs valuation guidance confirms that certain royalties and licence fees may need to be added to the price actually paid or payable where the applicable statutory conditions are satisfied. (Ticaret Bakanlığı)

Therefore, authorities may allege undervaluation even though no invoice was fabricated.

This is precisely why companies should distinguish between false invoicing and failure to include a separate dutiable element in customs value.

The legal and evidentiary defenses can be very different.

Can Directors Be Personally Investigated?

Potentially.

Prosecutors may investigate who authorized the disputed transaction, who knew the real purchase price and who approved the invoice submitted for customs purposes.

But holding the title of director does not automatically prove participation.

A foreign board member who never handled Turkish customs transactions should not automatically be treated identically to an employee alleged to have instructed a supplier to prepare a lower invoice.

The company’s organizational structure, delegation of authority and actual communications should be examined.

Can the Import Manager Be Investigated?

Yes, potentially.

Import managers, logistics employees, finance personnel and customs-compliance staff may be questioned because they often possess direct knowledge of the transaction.

Their procedural status should be established before substantive statements are provided.

The company should also assess whether the interests of individual employees differ from those of the company.

Separate legal representation may become appropriate where conflicts arise.

Can the Foreign Seller Be Investigated?

Potentially, particularly if authorities allege that the seller participated in creating false documentation.

However, jurisdictional and procedural questions can become more complicated where the seller and relevant individuals are located outside Turkey.

From the Turkish importer’s perspective, evidence from the foreign supplier may nevertheless be essential.

The company should preserve supplier correspondence and obtain underlying accounting records where possible.

Can False Invoice Allegations Lead to Document-Forgery Charges?

Potentially, depending on the document, how it was created and how it was used.

A customs investigation should therefore determine whether authorities are alleging only an offence under Law No. 5607 or also separate document-related criminal conduct.

This matters because separate offences can involve different statutory elements and consequences.

The defense should obtain clarity regarding every offence under investigation rather than responding generally to an accusation of “fraud.”

Can the Same Conduct Produce Both Customs and Criminal Proceedings?

Yes, potentially.

A company may simultaneously face an additional customs assessment, an administrative customs penalty and a criminal investigation concerning the same transaction.

The Ministry’s customs valuation guidance itself notes that the relevant administrative penalty provisions operate while the provisions of Law No. 5607 remain reserved. (Ticaret Bakanlığı)

The proceedings should therefore be coordinated carefully.

A statement made to customs concerning the invoice may later become relevant to the criminal investigation.

Does Paying the Additional Customs Duty End the Criminal Case?

Not automatically.

Payment of customs duties and criminal responsibility are separate legal questions.

Depending on the alleged offence and procedural stage, payment may have particular consequences under specific statutory mechanisms, but companies should not assume that simply paying an assessment will automatically terminate the investigation.

Before making strategic payments or admissions, the company should determine whether it disputes the underlying customs value and whether any provision concerning effective remorse or another procedural mechanism is applicable.

What Are the Strongest Defense Strategies?

The defense should begin with the actual commercial transaction.

The company should reconstruct the purchase price, identify every invoice issued, reconcile all payments and determine why the document presented to customs contained the disputed figure.

The most important evidence commonly includes the purchase contract, purchase order, commercial invoices, pro forma invoices, credit and debit notes, bank transfers, accounting records, bills of lading, customs declarations and communications with the supplier and customs broker.

The defense should then determine whether the alleged discrepancy represents an innocent accounting or documentary mistake, a legitimate pricing adjustment, a customs valuation disagreement or actual evidence of deliberate falsification.

These categories should never be blurred.

What Should a Company Do in the First 48 Hours?

The company should immediately preserve the complete transaction file and prevent routine deletion of relevant digital records.

It should identify every version of the invoice and establish when each document was created, received and used.

Bank transfers should be reconciled with invoices.

The company should determine who communicated with the supplier and customs broker.

Management should also establish whether prosecutors have opened a criminal investigation and whether any director or employee has been identified as a suspect.

No historical document should be altered in an attempt to “fix” the file.

Why Is an Internal Investigation Important?

A carefully structured internal investigation can establish facts before executives or employees provide statements to Turkish authorities.

The company needs to know whether the disputed invoice was generated by the foreign supplier, Turkish subsidiary, customs broker or another intermediary.

It should also determine whether similar documentation was used for previous imports.

If the problem is systematic, the company’s exposure may extend beyond the declaration currently under investigation.

The review should therefore consider historical transactions within the legally relevant period.

Should Previous Imports Be Reviewed?

Usually, yes, where the same pricing or invoicing methodology was repeatedly used.

If authorities discover an alleged double-invoice practice involving one shipment, they may examine whether similar discrepancies exist in previous transactions.

Companies should conduct their own review before the issue expands.

This is particularly important where the same supplier, customs broker and product have been used for several years.

Can False Invoice Allegations Affect Customs Authorizations?

Potentially.

Customs compliance history can matter for simplified procedures and customs authorizations.

For example, the Ministry’s current guidance concerning common transit authorizations includes conditions relating to customs violations, unpaid taxes and penalties, and certain final criminal convictions involving forgery, fraud, tax evasion and offences under Law No. 5607. (Ticaret Bakanlığı)

Accordingly, serious customs misconduct can potentially have consequences extending beyond a single assessment or criminal file.

For companies dependent on customs simplifications, this operational risk should be included in the defense strategy.

Can an Acquittal or Dismissal Protect the Company’s Reputation?

A favorable criminal outcome can be extremely important, but companies should separately manage regulatory and commercial consequences.

Banks, international business partners, compliance departments and parent companies may become concerned when allegations of customs fraud emerge.

The company should maintain accurate internal reporting and avoid describing an investigation as a conviction.

At the same time, public statements should be carefully controlled so that they do not prejudice ongoing proceedings.

Frequently Asked Questions About False Invoice Allegations in Turkish Customs Investigations

1. Is an incorrect invoice automatically considered customs fraud in Turkey?

No. An invoice discrepancy may result from an error, commercial adjustment or customs valuation dispute. Criminal liability requires separate analysis of the alleged conduct under the applicable legislation.

2. What happens if customs determines that the declared value was too low?

Additional customs duties may be assessed. Depending on the circumstances, administrative penalties under Customs Law No. 4458 may also apply. Ministry guidance explains the penalty framework for deficient customs-value declarations under Article 234. (Ticaret Bakanlığı)

3. Can using two invoices lead to a criminal investigation?

Yes, particularly where authorities believe a lower invoice was deliberately created or used to reduce customs duties. The Ministry has publicly reported cases involving alleged double invoicing that resulted in seizure and proceedings under Law No. 5607. (Ticaret Bakanlığı)

4. Can goods be seized because of a false invoice allegation?

Potentially. Where authorities suspect a smuggling offence, seizure of the relevant goods may become part of the criminal investigation.

5. Can foreign company directors be investigated personally?

Potentially, but criminal responsibility should be individualized. Corporate title alone does not establish that a director participated in falsifying or knowingly using an invoice.

6. What if the foreign supplier prepared the incorrect invoice?

The importer should preserve evidence showing who prepared the document, what information the importer received and whether the importer knew about any alleged falsity.

7. What if the customs broker accidentally used the wrong invoice?

This may be highly relevant. The company should preserve document-transmission records and communications demonstrating which invoice was provided and how the incorrect document came to be used.

8. Does every customs undervaluation case fall under Law No. 5607?

No. Customs valuation discrepancies can produce administrative consequences under Customs Law No. 4458. Whether conduct also constitutes an offence under Law No. 5607 requires separate analysis. (Ticaret Bakanlığı)

9. Does paying additional customs duties automatically terminate a criminal investigation?

No. Payment should not be assumed automatically to eliminate criminal exposure. Its consequences depend on the applicable offence and procedural circumstances.

10. What is the most important evidence in a false invoice investigation?

Commercial contracts, every version of the invoice, bank transfers, accounting records, customs declarations, supplier communications and correspondence with the customs broker are often central to determining whether the discrepancy was deliberate or innocent.

Legal Support for False Invoice and Customs Fraud Investigations in Turkey

A false invoice allegation at Turkish customs can create several layers of exposure at the same time. The importer may face additional customs duties, administrative fines, seizure of goods and a criminal investigation under Anti-Smuggling Law No. 5607. Directors, employees and customs brokers may also become individually involved.

The defense should therefore avoid assuming that a difference between the declared invoice and another commercial figure proves fraud. Turkish customs valuation rules require a legal analysis of the transaction value and other relevant elements, while criminal liability requires separate examination of the alleged conduct. (Ticaret Bakanlığı)

For foreign companies, the strongest strategy is usually to reconstruct the transaction completely: what was actually purchased, what was actually paid, which invoices existed, why different figures appeared, who prepared each document and what the Turkish importer knew when the customs declaration was submitted.

FFK Partner Hukuk ve Danışmanlık provides legal assistance to foreign companies, importers, exporters, multinational groups and company executives facing false invoice allegations, customs valuation disputes, double-invoice investigations, customs fraud allegations, Law No. 5607 proceedings, seizure and confiscation risks and customs-related criminal investigations in Turkey.

Av. Arb. Fırat Fesih Kaya assists clients in coordinating the customs-law and criminal-law dimensions of investigations and developing a defense strategy based on the commercial documentation, customs declaration, payment records and evidence concerning individual responsibility.

Email: ffk@ffkpartnerhukuk.com.tr
Address: Mevlana Bulvarı No:221, Yıldırım Tower, Balgat, Çankaya / Ankara

For foreign companies facing a false invoice allegation in a Turkish customs investigation, early legal review can be particularly important before company representatives provide statements, goods are subjected to further measures or the investigation expands to historical imports.