What Happens If Turkish Customs Thinks Your Invoice Is Too Low?

Imagine that a traveller or importer brings a product into Turkey and presents an invoice showing a purchase price of USD 500.

During the customs inspection, however, officers discover that:

• the same product normally sells for approximately USD 5,000;
• comparable import declarations show substantially higher values;
• online retailers advertise the product for several thousand dollars; or
• bank records indicate that a much larger payment may have been made to the seller.

Does Turkish Customs have to accept the USD 500 invoice?

No.

But the opposite proposition is equally important:

Turkish Customs cannot automatically conclude that an invoice is false merely because the declared price appears unusually low.

Turkish customs valuation law establishes a structured system for determining the value of imported goods. The starting point is generally the transaction value—the price actually paid or payable for the goods. If customs authorities have reasonable doubts regarding the truth or accuracy of that value, however, they may request additional documents, investigate the transaction and, if those doubts cannot be resolved, reject the declared transaction value and determine customs value using the other statutory valuation methods.

The consequences may range from a simple reassessment of customs duties to substantial administrative penalties and, in more serious cases involving deliberate deceptive conduct, a criminal investigation under Turkey’s Anti-Smuggling Law No. 5607.

The distinction is crucial:

A low price is a customs valuation problem. A deliberately false price supported by deceptive conduct may become a smuggling case.

1. What Is “Customs Value” Under Turkish Law?

Customs value is not simply whatever number appears on an invoice.

Under Customs Law No. 4458 and the Customs Regulation, customs value is the legally determined value used, among other purposes, as the basis for calculating ad valorem customs duties.

The Ministry of Trade states that customs value must be determined by applying six valuation methods in sequence:

1. Transaction value method
2. Transaction value of identical goods
3. Transaction value of similar goods
4. Deductive value method
5. Computed value method
6. Fallback method

As a general rule, customs must begin with the transaction value method.

It cannot simply choose whichever method produces the highest value.

If the transaction value can lawfully be accepted, the process normally ends there. Only where that method cannot properly be applied should customs proceed to the next valuation method.

2. The Invoice Is Important—but It Is Not Untouchable

In an ordinary commercial import, the transaction value is essentially the price actually paid or payable for the goods sold for export to Turkey, subject to the additions and adjustments required by customs legislation.

Therefore, an invoice is normally one of the most important pieces of evidence.

However, customs authorities are not legally required to accept an invoice without examining whether it reflects the genuine transaction.

Article 65 of the Customs Law gives customs authorities the power to examine declarations and supporting documents and to require additional documentation in order to verify the accuracy of the declaration.

The Ministry of Trade expressly confirms that customs authorities may investigate whether the declared customs value is genuine and accurate and may request further information and documents from the declarant.

This means that an invoice saying USD 500 is not conclusive if other information strongly suggests that the importer actually paid USD 5,000.

3. What Happens When Customs Thinks the Price Is Suspiciously Low?

The Customs Regulation contains an important “reasonable doubt” mechanism.

Where customs authorities doubt the truth or accuracy of the declared value, they may request additional information and documents from the importer.

If the importer provides a convincing commercial explanation and supporting evidence, the declared price may still be accepted.

If reasonable doubts remain after the investigation, customs may conclude that the transaction value method cannot be used and move to the subsequent valuation methods.

Importantly, the Ministry of Trade states that before reaching a final decision, customs should communicate the reasons for its continuing doubts to the importer and provide a reasonable opportunity to respond.

Accordingly, the process should not normally be:

“The invoice looks too cheap; therefore we will simply replace it with another price.”

There should instead be a legally structured valuation inquiry.

4. A USD 5,000 Product Bought for USD 500 Is Not Automatically Illegal

Suppose an item normally retails for USD 5,000 but the importer genuinely purchased it for USD 500.

That is unusual.

But unusual does not necessarily mean false.

There may be legitimate commercial explanations:

• liquidation sale;
• bankruptcy sale;
• warehouse clearance;
• discontinued model;
• damaged goods;
• refurbished goods;
• second-hand goods;
• demonstration product;
• cosmetic defects;
• bulk-purchase discount;
• distressed seller;
• end-of-season stock;
• special contractual rebate;
• long-standing supplier relationship.

The relevant question is not:

“What does this product normally cost?”

The first question is:

“What was actually paid or payable for this specific import transaction, and can that transaction be documented?”

The Ministry’s valuation guidance emphasises that the transaction value is the price actually paid or payable and that explanations for apparently low values must be evaluated according to commercial practice.

Therefore, a genuine USD 500 purchase may be defendable even where the ordinary market price is far higher.

5. What Evidence Can Customs Request?

Where a declared price appears unusually low, customs may seek documents beyond the commercial invoice.

Relevant evidence may include:

• bank transfer records;
• SWIFT documents;
• credit-card statements;
• purchase contracts;
• purchase orders;
• supplier correspondence;
• quotations;
• price lists;
• discount agreements;
• debit or credit notes;
• accounting records;
• export declarations from the seller’s country;
• freight documents;
• insurance documents;
• packing lists;
• supplier invoices;
• manufacturer documentation;
• evidence of defects or damage;
• previous import declarations;
• documents showing the relationship between buyer and seller.

The Ministry’s electronic customs documentation system itself recognises documents such as price lists, price letters, credit notes, debit notes and bank-transfer documentation as customs-value-related evidence.

A genuine discount is therefore much easier to defend when there is an evidentiary trail showing how and why the lower price arose.

6. Customs Can Examine Bank Transfers

One particularly important area is the actual payment made abroad.

Suppose the importer submits an invoice for USD 500 but banking records show:

USD 500 identified as the invoice payment + another USD 4,500 transfer to the same supplier.

That is substantially more serious than merely discovering a high internet price.

The Ministry of Trade’s customs valuation guidance refers to Council of State decisions in which additional payments to foreign suppliers were treated as evidence relevant to establishing the actual customs value.

Likewise, the Ministry refers to cases involving:

• invoice values deliberately shown below the true sales price;
• additional payments made openly to the exporter;
• double invoicing;
• false invoices; and
• exporters that did not actually exist.

In such circumstances, the administration may determine the customs value on the basis of the facts established by its investigation.

7. Can Turkish Customs Check Prices on the Internet?

Yes.

Internet information can be used as part of a customs valuation investigation.

Official Ministry of Trade material reproducing World Customs Organization valuation examples specifically refers to customs authorities conducting internet research concerning suppliers and prices for identical goods.

However, there is an important legal limitation.

An internet price is not necessarily the customs value.

For example:

USD 5,000 Apple Store retail price

is not automatically equivalent to:

the genuine wholesale export price paid by a distributor purchasing 1,000 units.

Online prices may differ because of:

• retail versus wholesale sales;
• local taxes;
• quantities purchased;
• geographic market;
• condition of the product;
• warranty;
• distribution costs;
• sales commissions;
• transportation;
• commercial level;
• discounts;
• model year.

Internet evidence may therefore provide a reason for customs to investigate, but the administration must still comply with the statutory valuation methods.

8. Can Customs Simply Use the Price of Another Product?

Not arbitrarily.

If customs rejects the declared transaction value and moves to the identical-goods or similar-goods methods, the comparison must satisfy the statutory criteria.

The Ministry of Trade emphasises that where customs uses an “identical goods” valuation method, it must establish why the comparator really qualifies as identical—for example by examining matters such as:

• physical characteristics;
• quality;
• reputation;
• country of production.

The administration must also explain why the preceding valuation methods could not be used.

Accordingly:

“Another importer brought something similar for USD 5,000” is not automatically sufficient.

Customs must establish the legal and factual comparability of the goods.

9. The Valuation Methods Must Be Followed in Order

This is one of the strongest protections available to importers in customs valuation disputes.

Customs cannot ordinarily skip directly from rejecting the invoice to whichever reference value is most convenient.

The Ministry’s official guidance refers to Council of State case law confirming that:

• transaction value should be considered first;
• if it cannot be used, the reason must be established;
• the next statutory method must then be considered;
• customs cannot move to a later method without establishing why earlier methods were unavailable.

This point can become extremely important when challenging an additional customs assessment.

10. What Happens in Passenger Customs?

The rule is even more straightforward for goods carried by passengers.

The Ministry of Trade’s current 2026 passenger guidance states that the value of passenger goods is determined on the basis of:

• invoice;
• sales receipt; or
• other documentation proving the amount paid.

However, where no such document is produced or the value shown in the document is considered too low, customs itself determines the value of the goods.

Therefore, a passenger cannot necessarily insist that Turkish Customs accept a USD 500 invoice where customs has legitimate grounds for concluding that the document does not reflect the real value.

11. Example: A Luxury Watch with a USD 500 Invoice

Consider the following hypothetical case.

A passenger arrives in Istanbul carrying a newly purchased luxury watch.

The watch:

• is unused;
• is inside its original box;
• has international warranty documents;
• is a current model;
• normally sells for around USD 5,000.

The passenger submits an invoice stating:

USD 500.

Customs searches the model and finds prices of USD 4,500–5,500.

What happens?

The online price alone does not conclusively prove that the invoice is fraudulent.

However, it provides a strong reason to investigate.

Customs may ask:

• How was payment made?
• Can you show your bank statement?
• Was there a discount?
• Why was the discount 90%?
• Is the seller an authorised dealer?
• Is the product second-hand?
• Is it damaged?
• Is there correspondence regarding the reduced price?
• Did you make another payment to the seller?
• Is there another invoice?

If the passenger cannot provide a credible explanation, customs may reject the USD 500 value and determine a higher customs value.

If investigators discover that the passenger actually paid USD 5,000 but intentionally obtained or used a USD 500 invoice to reduce Turkish customs taxes, the legal problem becomes significantly more serious.

12. What Is the Administrative Consequence of Understating Customs Value?

Customs Law Article 234 is particularly important.

According to the Ministry of Trade, where goods subject to import duties calculated on their value are declared at a value lower than the value determined under Customs Law Articles 23–31, the administration collects:

1. the additional customs duties resulting from the undervaluation; and

2. an administrative fine equal to three times the difference in customs duties.

This is important.

The penalty is not simply three times the difference between:

USD 500 and USD 5,000.

The statutory penalty under Article 234/1-b is generally calculated by reference to the customs-duty difference generated by the incorrect valuation.

13. Example of the Administrative Consequence

Assume, purely for illustration, that:

• declared customs value: USD 500;
• customs-determined value: USD 5,000;
• additional import taxes arising from the difference: USD 1,000 equivalent.

Article 234 may result in:

additional taxes: USD 1,000 equivalent

plus potentially:

administrative fine: USD 3,000 equivalent.

The actual calculation depends on the goods, tariff classification, applicable taxes and other customs charges.

The central point is that undervaluation can generate a liability significantly greater than merely paying the tax that was initially avoided.

14. Does Every Incorrect Invoice Amount Constitute Smuggling?

No.

This distinction is fundamental.

There may be:

• a valuation disagreement;
• an accounting mistake;
• an incorrectly calculated addition;
• a genuine commercial discount;
• confusion concerning freight or insurance;
• a dispute concerning royalties;
• a different interpretation of customs-value legislation.

Such circumstances do not automatically constitute a criminal offence.

Customs Law provides an administrative system specifically dealing with incorrect customs valuation and resulting tax differences.

Criminal liability requires additional elements.

15. When Can Undervaluation Become a Smuggling Crime?

Article 3/2 of Anti-Smuggling Law No. 5607 criminalises bringing goods into Turkey through deceptive acts or conduct without paying customs duties in whole or in part.

The current statutory penalty is imprisonment from two to five years and a judicial fine of up to ten thousand days.

Therefore, the criminal-law question is not merely:

“Was the declared value wrong?”

It is:

“Were deceptive acts or conduct deliberately used so that customs duties would be partially or completely unpaid?”

That is a substantially higher threshold than an ordinary valuation difference.

16. Why Intent Matters

Turkish criminal law is based on the principle that, unless otherwise specifically provided, criminal liability requires intent.

Article 21 of the Turkish Criminal Code states that commission of an offence depends on the existence of intent, meaning that the statutory elements must be realised knowingly and willingly.

Consequently, in an undervaluation case, the following distinction can be decisive.

Scenario A – Administrative Valuation Dispute

The importer genuinely purchased goods for USD 500.

Customs concludes that the evidence is insufficient and determines a higher customs value.

There is a customs valuation and potentially administrative penalty dispute.

Scenario B – Deliberate Deception

The importer actually paid USD 5,000.

The importer intentionally obtains an invoice stating USD 500 and presents it to customs so that import duties will be calculated on one-tenth of the true price.

There is now evidence capable of supporting an allegation of deceptive conduct under Law No. 5607.

17. Double Invoices Are Particularly Dangerous

One of the clearest examples is the double-invoice system.

For example:

Real commercial invoice: USD 5,000
Invoice produced to Turkish Customs: USD 500

If evidence demonstrates that the USD 5,000 invoice reflects the actual transaction while the USD 500 invoice was prepared solely for customs clearance, this is qualitatively different from a legitimate valuation disagreement.

The Ministry’s official valuation guidance expressly identifies double invoicing, artificially understated sales prices and false invoices among circumstances in which customs value may be established on the basis of the results of the investigation.

Depending on the evidence and the nature of the document, document-forgery offences may also arise in addition to customs-smuggling allegations.

18. What About Cash Payments?

Cash payments are not automatically illegal.

However, they can create significant evidentiary difficulties.

Imagine an importer states:

“The invoice says USD 500, and I paid exactly USD 500 in cash.”

Customs discovers that the normal wholesale value is approximately USD 5,000.

The importer has:

• no bank transfer;
• no correspondence;
• no discount agreement;
• no supplier price list;
• no evidence explaining the reduction.

The absence of documentation does not by itself prove smuggling.

But it makes it substantially more difficult to eliminate customs’ reasonable doubts.

By contrast, the importer would have a much stronger position if there were:

• contemporaneous emails explaining the liquidation sale;
• an authentic purchase contract;
• supplier accounting documents;
• export records;
• evidence that the product was damaged;
• photographs;
• a matching cash receipt.

19. A Cheap Invoice Can Be Genuine

Businesses should also remember that customs law does not establish a minimum market price for every transaction.

A seller may genuinely sell a product below:

• its normal retail price;
• manufacturing cost;
• market value;
• previous sales prices.

The mere fact that the transaction is economically unusual does not automatically allow customs to treat it as fraudulent.

Indeed, the Ministry’s valuation guidance stresses the need to examine explanations within the framework of commercial practices and requires customs to justify why the transaction value method has been rejected.

The importer should therefore explain the commercial reason for the price rather than relying solely on the invoice.

20. Related Companies Require Special Attention

Low prices are frequently questioned where the buyer and seller are related companies.

For example:

Turkish subsidiary buys a product from its foreign parent for USD 500 while unrelated customers normally pay USD 5,000.

The relationship between the parties does not automatically invalidate the transaction value.

The Ministry of Trade expressly states that the existence of a relationship between buyer and seller is not by itself sufficient to reject the declared price. Customs must examine whether the relationship influenced the price.

Transfer pricing and customs valuation therefore need to be analysed carefully and separately.

21. How Should an Importer Respond to a Customs Valuation Investigation?

Ignoring the customs authority’s request is usually a poor strategy.

The importer should normally prepare a coherent evidentiary explanation addressing:

The Transaction

What exactly was purchased?

The Price

Why was the price lower than expected?

Payment

How and when was payment made?

The Seller

Is the seller a genuine business?

Commercial Reason

Was the transaction a clearance sale, damaged-goods sale or bulk discount?

Comparison Products

Are customs’ comparator goods really identical or similar?

Internet Prices

Are the prices identified by customs retail prices while the import transaction was wholesale?

Additional Payments

Were any other payments made directly or indirectly to the seller?

The objective is not simply to repeat:

“My invoice is real.”

The objective is to demonstrate why the invoice reflects the actual transaction value.

22. What If Customs Issues Additional Tax and a Fine?

The importer should examine both:

the valuation methodology and
the penalty decision.

Among the questions to consider are:

• Did customs establish reasonable grounds for rejecting the transaction value?
• Was the importer given an opportunity to respond?
• Did customs request supporting documents?
• Why was the transaction value method abandoned?
• Was the identical-goods method properly considered?
• Is the comparator genuinely identical?
• If similar goods were used, are they legally comparable?
• Was an internet retail price improperly treated as an import transaction value?
• Were commercial-level and quantity differences taken into account?
• Was the administrative fine calculated correctly?

These procedural questions can materially affect the legality of the additional assessment.

23. There Is a Short Deadline to Challenge the Customs Decision

Where customs issues additional assessments, penalties or other administrative decisions, Customs Law Article 242 becomes critical.

The Ministry’s guidance states that notified customs taxes, penalties and administrative decisions may be challenged through the customs administrative objection procedure within 15 days from notification.

Consequently, a company receiving a customs valuation reassessment should not spend weeks informally negotiating with officials while allowing the objection deadline to expire.

The notification date should be recorded immediately.

24. Practical Risk Table

Low Risk

Product normally costs USD 5,000.

Importer genuinely buys it for USD 500 because it is damaged.

There is:

• authentic invoice;
• bank transfer for USD 500;
• photographs of damage;
• correspondence about the discount.

Likely issue: customs valuation examination.

Moderate Risk

Product normally costs USD 5,000.

Invoice states USD 500.

Importer says it was a special discount but has almost no supporting documentation.

Likely issue: transaction value may be rejected; additional assessment and administrative penalty risk.

High Risk

Product normally costs USD 5,000.

Invoice presented to customs states USD 500.

Banking records show USD 5,000 was actually transferred to the seller.

Likely issue: additional customs taxes and administrative penalties plus potential criminal investigation.

Very High Risk

Actual invoice states USD 5,000.

A second invoice stating USD 500 is intentionally prepared for Turkish Customs.

The importer uses the second invoice to reduce import taxes.

Likely issue: evidence may support an allegation of deliberate deceptive conduct under Law No. 5607, in addition to customs-tax consequences.

25. Final Answer

If Turkish Customs believes your invoice is too low, it does not necessarily have to accept the declared figure.

Customs authorities may:

• investigate the transaction;
• request bank and commercial records;
• compare identical or similar imported goods;
• conduct market and internet research;
• question the supplier;
• reject the transaction value where reasonable doubts remain;
• determine customs value under the successive statutory methods;
• assess additional import duties; and
• impose administrative penalties where the conditions of Customs Law Article 234 are satisfied.

But a suspiciously low price is not automatically proof of smuggling.

For criminal liability under Anti-Smuggling Law No. 5607, the matter must go beyond an ordinary disagreement about value and involve the statutory elements of bringing goods into Turkey through deceptive acts or conduct resulting in customs duties being wholly or partly unpaid.

That distinction separates:

“Customs does not believe your valuation”

from the much more serious allegation:

“You deliberately used a false valuation to evade customs duties.”