Customs Questions the Authenticity of an Invoice in Turkey: What Evidence Should the Importer Provide? (2026 Updated Guide)

Turkish Customs questions whether an import invoice is genuine. Learn what foreign exporters and Turkish importers should provide to prove the transaction, customs value, payment, supplier relationship and authenticity of commercial records.

When Turkish Customs questions the authenticity of an invoice submitted with an import declaration, the dispute can quickly develop beyond a simple documentation problem. Customs may question whether the invoice reflects a genuine commercial transaction, whether the declared price was actually paid or payable, whether another invoice exists, whether the buyer and seller concealed additional payments, or whether the document was created to reduce customs duties. Depending on the evidence, the case may lead to reassessment of customs value, additional duties, administrative penalties, seizure measures and, in more serious circumstances, a criminal investigation concerning allegedly false documentation or smuggling-related conduct.

For this reason, the Turkish importer and foreign exporter should not respond by simply submitting another copy of the disputed invoice. The objective should be to reconstruct the entire commercial transaction with independent and mutually consistent evidence.

Why Does Turkish Customs Question an Invoice?

Customs authorities may become suspicious where the declared price appears unusually low, invoice information conflicts with transport documents, quantities do not correspond with packing records, the exporter cannot verify the invoice, payment records show different amounts, two invoices appear to exist for the same shipment, or the commercial relationship is inconsistent with the documentation presented at clearance.

Risk analysis, post-clearance audits and information obtained from foreign authorities can also lead to questions about previously accepted invoices.

Invoice Authenticity and Customs Value Are Related but Different Issues

The importer should first determine exactly what Customs disputes. Customs may accept that an invoice is genuine but argue that the invoice price does not represent the complete customs value. Alternatively, authorities may allege that the document itself is false, altered or unrelated to the actual transaction.

These allegations require different defenses.

Obtain the Customs Authority’s Exact Allegation

The importer should identify whether Customs alleges that the invoice was fabricated, altered, issued by the wrong company, undervalued, inconsistent with payment records or contradicted by another document.

A defense prepared without understanding the precise allegation can waste valuable time.

Preserve the Original Invoice

Keep the original electronic or physical invoice exactly as received from the foreign supplier. Do not modify dates, descriptions, quantities, prices or other information after Customs raises questions.

Where the invoice was generated electronically, preserve the original electronic record and associated business-system information where available.

Obtain Confirmation Directly From the Foreign Supplier

The foreign supplier should confirm that it issued the invoice and identify the corresponding transaction, customer, products, quantity, price and payment terms.

However, a simple confirmation letter should not be the only evidence. Customs may expect the transaction to be supported by ordinary commercial records.

Provide the Sales Contract

A written supply agreement can help demonstrate how the transaction arose. Relevant provisions may include product specifications, unit prices, payment terms, delivery terms, discounts, commissions, warranties and pricing-adjustment mechanisms.

The contract should be consistent with the invoice.

Purchase Orders Can Be Important

Purchase orders created before shipment can demonstrate that the invoiced price was commercially agreed before the customs dispute began.

Preserve the original purchase order, acceptance and subsequent amendments.

Pro Forma Invoices Should Be Explained

A pro forma invoice may contain a price different from the final commercial invoice because quantities, freight, discounts or commercial terms changed.

If both documents exist, explain the difference rather than concealing the earlier document.

Bank Payment Records Are Among the Most Important Evidence

Bank records can help establish whether the importer actually paid the amount stated in the invoice.

Prepare payment instructions, transfer records, account statements and transaction references connecting the payment with the particular invoice.

What If Payment Has Not Yet Been Made?

Deferred payment does not by itself establish that an invoice is false. The importer should provide the contractual payment terms and evidence showing when payment becomes due.

Later payment records should be preserved when the transaction is completed.

Partial Payments Must Be Reconciled

If the invoice was paid in installments, prepare a reconciliation showing how each payment relates to the total invoiced amount.

Unexplained payments to the supplier can create further questions.

Review Payments to Related Parties

Customs may investigate whether part of the purchase price was paid to another company within the supplier’s corporate group.

The importer should identify all payments connected with the imported goods and explain their commercial basis.

Side Payments Can Create Serious Customs Exposure

Payments outside the invoice may become significant where they relate to the imported goods. These can include commissions, royalties, license fees, tooling charges, assists or other amounts depending on the transaction.

The existence of additional payments does not automatically mean the commercial invoice is fake, but their customs valuation treatment should be analyzed separately.

Compare the Invoice With the Customs Declaration

Product description, quantity, currency, unit value, seller, buyer and other relevant information should be reconciled with the customs declaration.

Any difference should have a documented explanation.

Compare the Packing List

The packing list can help confirm quantity, package numbers, gross and net weight and product identity.

Material inconsistencies should be investigated before the response is submitted.

Review Transport Documents

Bills of lading, airway bills, road transport documents and other transportation records can independently support the existence of the shipment and identify the parties, route, quantity and timing.

Freight Records May Explain Price Differences

Where the commercial terms separate product value and transportation costs, freight invoices and transport contracts may help explain differences between figures appearing in various records.

Export Declaration From the Foreign Country Can Be Powerful Evidence

Where legally obtainable, the foreign export declaration may help demonstrate the value and description declared when the goods left the exporting country.

If the export declaration reflects the same commercial invoice, it can provide independent support for the importer’s position.

What If the Foreign Export Declaration Shows a Different Value?

Do not ignore the discrepancy. Determine whether it results from statistical valuation, freight treatment, currency conversion, a clerical mistake, another invoice or a genuinely different declared transaction value.

A material unexplained difference can significantly weaken the defense.

Supplier Accounting Records Can Support Authenticity

The exporter may be able to provide accounting entries showing that the invoice was recorded in its ordinary books and records.

Customer ledger entries, sales journals and receivable records can demonstrate that the invoice existed independently of the Turkish customs dispute.

Importer’s Accounting Records Are Equally Important

The Turkish importer should preserve its purchase ledger, inventory records, accounts payable information and other accounting entries relating to the transaction.

The records should show that the invoice was booked in the ordinary course of business.

Inventory Records Can Confirm the Transaction

Warehouse receipts, stock entries and internal inventory records can connect the imported quantity with the goods actually received by the company.

This can be particularly useful where Customs questions whether the invoice relates to the goods presented.

Commercial Correspondence Can Establish the Negotiation History

Emails and other business communications may show negotiations concerning quantity, price, discounts, delivery schedules and payment terms.

Contemporaneous communications created before the customs dispute can be highly relevant.

Preserve Price Negotiations

If the price was unusually low because the importer negotiated a substantial discount, preserve evidence showing how and why that discount was granted.

A low price is not automatically a false price.

Explain Genuine Commercial Discounts

Discounts may result from volume purchases, advance payment, end-of-season stock, long-term commercial relationships, defective packaging, market-entry strategies or other legitimate commercial circumstances.

The explanation should be supported by evidence rather than created after Customs questions the value.

Related-Party Transactions Require Additional Preparation

Where the Turkish importer and foreign seller are related, Customs may scrutinize whether the relationship influenced the price.

The importer should prepare evidence concerning the commercial pricing methodology and circumstances surrounding the transaction.

Transfer Pricing Documents May Be Relevant but Are Not Automatically Decisive

Corporate transfer-pricing documentation can help explain how related-party prices are determined. However, customs valuation and corporate tax transfer pricing involve different legal frameworks.

A transfer-pricing report should therefore not automatically be treated as conclusive proof of customs value.

Manufacturer Price Lists Can Help

Contemporaneous price lists may support the commercial reality of the invoice, particularly when combined with evidence explaining discounts or customer-specific pricing.

A price list alone, however, may not prove the actual transaction price.

Compare Sales to Other Customers Carefully

Customs may identify higher prices charged to other customers. The importer should examine whether those transactions genuinely involve comparable goods, quantities, dates, markets, delivery terms and commercial conditions.

Different prices do not automatically establish invoice falsification.

Currency Differences Should Be Explained

Check the invoice currency, payment currency and customs declaration. Currency conversion can create apparent discrepancies.

Preserve the exchange-rate methodology and payment documentation.

Credit Notes and Debit Notes Must Be Disclosed and Explained

Post-invoice price adjustments can become important. Preserve credit notes, debit notes and accounting records showing why the adjustment occurred.

Do not treat these documents as irrelevant merely because they were issued after importation.

Year-End Price Adjustments Require Special Attention

Related companies sometimes make retrospective transfer-pricing adjustments at the end of the financial year. These adjustments may create customs valuation questions where they relate to imported goods.

The importer should analyze whether the adjustment affects previously declared customs values.

Royalties and License Fees Should Be Reviewed

If the importer pays royalties or license fees connected with the imported goods, determine whether they have customs valuation consequences under the applicable rules.

Failure to declare a relevant payment can create a separate dispute even where the commercial invoice itself is authentic.

Tooling and Free-of-Charge Inputs May Matter

If the Turkish buyer supplies molds, tools, designs, materials or other items used in producing the imported goods, their customs valuation treatment should be reviewed.

Again, this does not necessarily make the supplier’s invoice false, but it can affect the completeness of the declared customs value.

Customs May Contact the Foreign Exporter

The exporter should ensure that personnel responding to verification requests understand the transaction.

A careless response stating that the company “cannot find the invoice” can seriously complicate the Turkish importer’s defense.

Foreign Exporter and Turkish Importer Must Coordinate

Both parties should use the same genuine transaction records. Their explanations concerning price, quantity, payment and product identity should be consistent.

Coordination does not mean manufacturing a common story. It means accurately reconstructing the same historical transaction.

Never Create Documents Retrospectively

Do not create a backdated contract, invoice, payment record or commercial correspondence after Customs raises concerns.

False supporting evidence can transform a valuation dispute into a much more serious legal problem.

What If the Invoice Contains a Genuine Clerical Error?

A typographical or administrative error does not necessarily mean the entire invoice is fraudulent. The importer should identify the error, explain how it occurred and provide contemporaneous records establishing the correct information.

Transparency is generally preferable to attempting to conceal the mistake.

What If Two Invoices Exist?

This requires immediate investigation.

There may be legitimate explanations—for example, a pro forma invoice followed by a final commercial invoice or cancellation and replacement of an incorrect invoice. However, two different commercial invoices for the same goods and transaction can create significant customs and criminal risk if one reflects a lower price used only for customs purposes.

Separate Customs Debt From Criminal Allegations

Even if Customs concludes that the declared value was too low, that conclusion does not automatically establish every element of a criminal offense.

The additional customs assessment, administrative penalty and any criminal investigation should be analyzed separately.

False Documentation Allegations Require Immediate Criminal-Law Review

Where authorities allege deliberate use of a fabricated or altered invoice, the case may move beyond ordinary customs valuation.

Company managers, customs representatives and other persons involved in the declaration may need individual criminal-law representation depending on the circumstances.

Preserve Who Did What

Identify who negotiated the purchase, received the invoice, sent documents to the customs broker, approved the declaration and arranged payment.

Corporate criminal investigations often require careful separation of individual roles and knowledge.

Company Directors Are Not Automatically Responsible for Every Document

Management position alone should not substitute for evidence concerning an individual’s conduct, knowledge and involvement.

If managers are investigated personally, their actual role in the import transaction should be documented.

Customs Broker Communications Should Be Preserved

Keep the documents sent to the broker, instructions given and any questions raised before filing the declaration.

This evidence can become important where responsibility for incorrect information is disputed.

Can Customs Reassess the Value?

Potentially. If Customs lawfully rejects the declared transaction value or identifies additions that should have been included, additional customs duties may be assessed under the applicable valuation framework.

The methodology used by Customs should be reviewed carefully.

Can an Administrative Penalty Be Challenged?

Potentially. The importer should examine the legal basis, calculation, factual allegations and notification date of any penalty separately from the customs duty assessment.

Protect the Customs Objection Deadline

Once an additional customs assessment, penalty or other appealable customs decision is formally notified, the importer should immediately determine the applicable objection procedure and deadline.

Do not allow informal negotiations or document exchanges to cause the formal challenge period to expire.

What If Customs Seizes the Goods?

If the invoice-authenticity allegation results in detention or seizure, obtain the legal basis and relevant decision or record immediately.

The strategy will depend on whether the goods are merely held during customs examination or formally seized within a criminal investigation.

Return of Goods May Require a Separate Procedure

Challenging a customs assessment does not necessarily resolve a criminal seizure automatically.

Where goods have been seized in a criminal proceeding, the procedural route for release or return should be evaluated separately.

Post-Clearance Audits Can Raise Historical Invoice Questions

Customs may question invoices years after goods have been released during a post-clearance audit.

The company should therefore preserve contracts, invoices, payments, accounting records and supplier correspondence according to an organized customs-record retention policy.

Review Other Imports From the Same Supplier

If one invoice is questioned, determine whether identical pricing structures or documentation were used for other declarations.

A single dispute should not automatically be assumed to invalidate all previous imports, but historical exposure should be assessed proactively.

Create a Declaration-by-Declaration File

For repeated imports, record the customs declaration, invoice, payment, product, quantity, supplier, customs value and any relevant adjustment.

This can substantially improve the company’s ability to respond to a broader audit.

Foreign Supplier Liability Should Be Reviewed

If the exporter supplied inaccurate or falsified documentation without the Turkish importer’s knowledge, the importer may have contractual claims.

Review representations concerning price, customs documents, origin, product description and regulatory compliance.

Immediate Evidence Checklist

When Turkish Customs questions an invoice’s authenticity, the importer should immediately preserve and organize the commercial invoice, sales contract, purchase order, pro forma invoice where relevant, bank payments, supplier accounting confirmation, importer’s accounting entries, packing list, transport documents, foreign export declaration where available, warehouse and inventory records, price negotiations, correspondence, discounts, credit or debit notes, related-party documentation and customs broker communications.

Frequently Asked Questions

Is a low invoice value enough to prove that an invoice is fake?

No. An unusually low value may trigger scrutiny, but the commercial circumstances and supporting transaction evidence must be examined.

What is the strongest evidence that an invoice is genuine?

There is rarely one decisive document. A consistent evidentiary chain involving the contract, purchase order, invoice, bank payment, accounting records, shipping documents and supplier records is generally much stronger.

Can Customs ask for bank payment records?

Payment information can become highly relevant where Customs questions whether the declared invoice reflects the actual transaction price.

What if the invoice has not yet been paid?

Provide the contractual payment terms and evidence showing the outstanding liability. Deferred payment does not by itself establish falsification.

Can a foreign supplier confirm the invoice?

Yes, but supplier confirmation is stronger when supported by accounting, export and commercial records.

What if a pro forma invoice shows a different price?

Explain why the price changed and provide contemporaneous evidence supporting the final commercial invoice.

Can an incorrect invoice lead to criminal proceedings?

Potentially, particularly where authorities suspect deliberate falsification, concealment or use of false documentation rather than an ordinary clerical or valuation disagreement.

Can company managers be investigated?

Potentially, but individual responsibility should be assessed according to each person’s actual conduct, knowledge and involvement.

Can the importer challenge additional duties and penalties?

Potentially. The customs assessment and penalty should be reviewed separately and the applicable objection deadlines protected.

What should the importer do first?

Reconstruct the transaction from independent records. The strongest response is not another copy of the disputed invoice but a consistent chain showing how the goods were ordered, priced, shipped, recorded in both companies’ accounts and actually paid for.

Client-Focused Legal Support for Invoice Authenticity and Customs Valuation Disputes

Fırat Fesih Kaya Law Office assists foreign exporters, international companies and Turkish importers facing invoice-authenticity investigations, customs valuation disputes, post-clearance assessments, administrative penalties, goods seizure and related criminal proceedings in Turkey. Lawyer Fırat Fesih Kaya provides legal assistance in reconstructing transaction evidence, coordinating foreign supplier documentation, preparing customs objections, challenging additional assessments and penalties, and defending managers and companies where customs allegations develop into criminal investigations.

Phone:
+90 312 434 22 22

Mobile:
+90 532 769 22 22

Email:
info@firatfesihkaya.av.tr

Address:
Mevlana Boulevard No:221, Yıldırım Tower, Office No:148, 06520 Balgat, Çankaya, Ankara, Turkey