Report it first and pay a tenth.
If the tariff heading declared to Turkish customs is wrong and the resulting difference in import duties exceeds 5%, a fine of three times that difference is imposed on top of the duty (Customs Law art. 234/1-a). The third paragraph of the same article opens a door most people never use: if the discrepancy is reported by the declarant before customs detects it, the fines are applied at 10%. Three times becomes 0.3 times. Protection going forward is a separate instrument — Binding Tariff Information (art. 9), valid for six years and binding on customs towards its holder.
The article numbers below are taken directly from the official text of Customs Law no. 4458. This page still does not tell you what to do: which paragraph applies to your file, how the difference is calculated and how the notification is made all depend on the file. Decide it with your customs broker.
How the fine is calculated
The law does not punish the wrong heading on its own — it punishes the duty difference the heading produces. The measure is the gap between the import duties calculated on the declaration and those payable according to examination or post-clearance control.
| Situation | Outcome | Basis |
|---|---|---|
| Duty difference exceeds 5% | A fine of three times the difference, on top of the duty | art. 234/1-a |
| Quantity difference up to 5%, or an arithmetic error | Half the difference, on top of the duty | art. 234/1-c |
| You reported it before customs found it | The fines above are applied at 10% | art. 234/3 |
Fines cannot fall below the amount set out in art. 241/1 (art. 234/6). That amount is increased each year by the revaluation rate determined under the Tax Procedure Law (art. 241/2) — no current figure is given on this page, because it changes within the year and has to be verified.
The distinction that matters: the 5% threshold looks at the duty difference, not at how many digits of the code were wrong. The same incorrect heading may produce no fine at all if the duty rate does not change, and go straight to three times if it does. There is no such thing as a code being “slightly” wrong — the duty decides.
If you report it first
The statutory sentence is short and unambiguous: “Where the discrepancies referred to above are notified by the declarant before they are detected by the customs administration, the said fines shall be applied at ten per cent.” (art. 234/3)
The practical effect is large. On a difference above 5% the ordinary fine is three times the difference; on self-notification 10% of that fine applies, i.e. 0.3 times the difference. The distance is tenfold and the only variable is timing — before customs finds it, or after.
One consequence: once you have spotted the error, waiting is the most expensive option available. Post-clearance control can arrive years later, and by then the notification window has closed.
When an error surfaces the sequence is: establish the scope — which declarations, which period, what difference; justify the correct heading — nomenclature, explanatory notes and any World Customs Organization decisions; notify the administration; pay the duty difference. Every day the third step slips, the art. 234/3 window narrows.
Binding Tariff Information
Correcting a past error and preventing a future one are different jobs. The instrument for the second is Binding Tariff Information (BTI). It is issued on written request (art. 9/1) and binds the customs administration towards the holder, on the tariff heading of the goods only (art. 9/2).
- Validity: six years from the date of issue; binding origin information runs three years (art. 9/4).
- Condition: you must prove that the goods to be declared and the goods described in the BTI correspond in every respect (art. 9/3-a). “A similar product” is not enough.
- Incorrect information: a binding decision based on incorrect or incomplete information supplied by the applicant is annulled (art. 9/4).
A BTI ceases to be valid in three cases (art. 9/5): a change in the Turkish Customs Tariff Schedule that the information no longer matches; a change in the World Customs Organization nomenclature, explanatory notes or heading decisions that Türkiye is bound by, which the information no longer matches; or notification to the holder that the BTI has been annulled or amended. In the first two cases validity ends on the date the change is published in the Official Gazette.
So a BTI is not a document you obtain once and forget: the tariff schedule changes every year, and a BTI that no longer matches simply lapses. Following the annual tariff changes is what maintaining a BTI actually means.
When it goes wrong
Last year's code is copied into this year's declaration
The tariff schedule is updated annually. A code that was right last year for the same product may have been withdrawn or split. A copied code can mean both the wrong duty and a BTI that has already lapsed.
The error is spotted, then left in the hope it goes unnoticed
That is knowingly giving up the tenfold reduction in art. 234/3. By the time post-clearance control arrives, the notification window has closed.
A BTI is used for a similar product
A BTI requires correspondence in every respect between the goods described and the goods declared (art. 9/3-a). One obtained for a product in the same family but of different composition offers no protection.
The supplier's code is entered without checking
The classification used in the exporter's own country need not match the heading in the Turkish Customs Tariff Schedule. Responsibility for the declaration rests with whoever lodges it.
Frequently asked
What happens if the HS code is wrong?
The fine attaches not to the code but to the duty difference it produces. Above a 5% difference the fine is three times that difference on top of the duty (art. 234/1-a). For a quantity difference up to 5% or an arithmetic error it is half the difference (art. 234/1-c).
If the duty rate does not change, a wrong code may produce no fine at all — the measure is the duty.
What changes if I report the error myself?
If the declarant notifies the discrepancy before the customs administration detects it, the fines are applied at 10% (art. 234/3). A fine of three times the difference becomes 0.3 times.
The only variable is timing.
How long is Binding Tariff Information valid?
Six years from the date of issue (art. 9/4). But if the tariff schedule or a World Customs Organization decision changes and the BTI no longer matches, validity ends on the date that change is published in the Official Gazette (art. 9/5).
Can I use a BTI for another product?
No. You must prove correspondence in every respect between the goods to be declared and the goods described in the BTI (art. 9/3-a). A BTI based on incorrect or incomplete information given at application is also annulled (art. 9/4).
Is there a floor on the fine?
Yes. Fines under art. 234 cannot be lower than the amount in art. 241/1 (art. 234/6). That amount is raised each year by the revaluation rate under the Tax Procedure Law (art. 241/2).
We do not publish the current figure here; it changes within the year and needs verifying. Ask your broker for the amount that applies to the file.
Sources
- Turkish Customs Law no. 4458 Every rate, period and condition on this page comes from this statute. Articles relied on: art. 9 (binding tariff information; six years, correspondence requirement, loss of validity), art. 15 (the Customs Tariff), art. 234/1-a (three times the difference), art. 234/1-c (half the difference), art. 234/3 (10% on self-notification), art. 234/6 and art. 241/1–2 (floor amount and annual revaluation) · mevzuat.gov.tr · accessed 10 Sep 2026
- Republic of Türkiye, Ministry of Trade — customs procedures Binding tariff information applications and administrative rules on tariff practice · ticaret.gov.tr · accessed 10 Sep 2026
This page is for information only. It is not legal or customs brokerage advice and does not tell you what to do. The statute was read directly and article numbers are given; which paragraph applies to a given file, how the difference is calculated and the form the notification takes all depend on the file. The Customs Regulation and secondary legislation have not been separately examined here. If you hold a declaration carrying penalty exposure, speak to your customs broker.
Change log
- Page published. Every rate and period was read directly from the official text of Customs Law no. 4458 on mevzuat.gov.tr, with article numbers given inline. The floor amount in art. 241/1 is not stated as a figure because it is revalued during the year. The Customs Regulation was not separately examined and the source note says so.