How to Verify a Turkish Tax Certificate (Vergi Levhası): A Buyer’s Guide

When you ask a Turkish supplier for proof that it is a genuine business, one of the first documents you are likely to receive is a vergi levhası, the Turkish tax certificate. It is a short, plain document, but read carefully it tells you a great deal: the name under which the business is registered for tax, its tax office, its main registered activity and when it started trading. This guide explains what a Turkish tax certificate is, how vergi levhası verification works, what to compare it against and, just as importantly, what even a verified certificate cannot prove.

It complements our earlier guides on company registry records. If you have not yet checked the supplier’s entry in the central trade registry, start with our guide to looking up a Turkish company in MERSİS; the tax record and the registry record are far more useful read together than apart.

What is a vergi levhası?A vergi levhası is a tax registration certificate showing that a business is registered as a taxpayer with the Turkish Revenue Administration (Gelir İdaresi Başkanlığı, or GİB). Under the Turkish Tax Procedure Law, certain taxpayers are expected to obtain a certificate each year. Today most certificates are generated and printed electronically through GİB’s online tax office services. The approval code issued by the system is treated as the certificate’s authentication, so a wet signature or a tax office stamp is not normally expected.

The certificate is not only renewed annually; it generally has to be regenerated when the business name, address, tax office or main activity code changes. The date of the certificate you receive is therefore as important as its content. A certificate generated several years ago may not reflect the position today.

What does a Turkish tax certificate show?The template may change slightly over time, but a vergi levhası typically shows the following:

* Name or trade name (adı soyadı / ticaret unvanı): the full legal name of a company, or the owner’s name for a sole proprietorship.

* Business address (iş yeri adresi): the address notified to the tax office.

* Tax number: a 10-digit tax identification number (vergi kimlik numarası, VKN) for companies; for sole proprietors, usually the owner’s 11-digit national identity number (T.C. kimlik numarası).

* Tax office (vergi dairesi): the office at which the business is registered.

* Tax type (vergi türü): for example corporate income tax or personal income tax.

* Main activity code and description (ana faaliyet kodu): a code, usually six digits, based on the NACE classification, with a description of the activity.

* Start date (işe başlama tarihi): the date the tax registration began.

* Declared figures: usually the tax bases (matrah) declared for the last three years and the tax assessed for each of those years. A business that started during the year may show “Yeni İşe Başlama” (new start) in this field instead.

* Approval code and barcode or QR code: the details that allow the certificate to be checked electronically.

The relevant regulations also refer to activity status (active, ceased or in liquidation) as information that may appear on the certificate. Exactly which fields you see can depend on the year and template under which the certificate was generated.

Company tax number or national ID number?Companies such as an A.Ş. (joint-stock company) or a Ltd. Şti. (limited company) are registered under a 10-digit VKN. A sole proprietorship uses the owner’s 11-digit national identity number as its tax number. If a supplier presents itself as a “factory” or an “A.Ş.” but its certificate shows an 11-digit number and a person’s name, you are probably dealing with a sole proprietorship. That is not a problem in itself, but if it does not match how the supplier describes itself, ask for an explanation. Short definitions of VKN, vergi dairesi and şahıs şirketi are in our glossary.

How to read the declared figuresThe tax base and tax assessed for recent years can give a rough idea of the scale of activity the business has declared to the tax office. These figures are not turnover, however, and on their own they do not show financial strength or production capacity. Even so, if a supplier says it is ready to take on very large orders but its certificate shows only “Yeni İşe Başlama” or very small amounts, it is reasonable to ask about its track record and references.

Vergi levhası verification: step by stepVerifying a vergi levhası means checking that the document you hold matches the record in GİB’s systems. According to GİB, tax number and tax certificate queries and verification are offered free of charge through e-Devlet (the Turkish government portal) and through electronic services such as the Digital Tax Office (Dijital Vergi Dairesi), the Internet Tax Office and the Interactive Tax Office. Menu names, login requirements and screen layouts change from time to time, so treat the steps below as a general route map rather than exact instructions.

1. Ask for a current copy. Request the most recent electronically generated certificate as the original PDF, rather than a screenshot or a phone photograph.

2. Note the approval code (onay kodu), the barcode or QR code and the tax number. A certificate without an approval code generally cannot be verified electronically.

3. Go to GİB’s official website (gib.gov.tr) yourself and follow its links to the online tax office services. Do not enter any details until you can see a gov.tr address in your browser.

4. Find the tax certificate verification function (vergi levhası doğrulama). It usually asks for the VKN or national ID number and the approval code from the certificate. Some queries may be available without logging in; others may require e-Devlet or GİB credentials.

5. Compare the result line by line with the certificate: name, tax office, tax type, activity code, start date and the declared figures should all match exactly.

6. If you scan the QR code with your phone, check that the link opens on the gib.gov.tr domain. A QR code on a forged document can just as easily lead to a convincing fake page.

7. Save a dated screenshot of the result, so that you can show what you checked and when if a dispute arises later.

Turkish tax number check: what a VKN alone can showIf you want to verify a Turkish company tax ID but have only the number rather than a certificate, GİB services may allow a tax number query. Such queries generally show whether the number belongs to a valid taxpayer and may display basic details such as the taxpayer’s name or tax office. How much is shown, and whether a login is needed, can vary between services. Note that the e-Devlet service for finding a tax number is designed for an authenticated person to look up their own number, not to research another business.

Practical obstacles for foreign buyersFor buyers outside Türkiye, this is not always straightforward. The interfaces are largely in Turkish, some services may require Turkish identity credentials, and interpreting the result screens takes some familiarity. The most common mistake, though, is to “verify” a certificate through a link or QR code supplied by the seller. Always reach the official site independently; a check that relies on a link provided by the supplier protects no one.

What to compare the certificate againstA verified certificate only becomes meaningful when it is read alongside the other documents. The aim is to confirm that the same business appears under the same identity everywhere. Work through these comparisons one by one:

* MERSİS record: the name, address and tax number should match the registry. For companies, the 16-digit MERSİS number is generally derived from the tax number, so the two numbers are usually visibly related.

* Trade Registry Gazette (Ticaret Sicil Gazetesi): the incorporation date and any changes of name or address should be consistent with the start date and address on the certificate.

* Quotation and pro-forma invoice: the name, VKN and tax office should be identical to the certificate.

* Invoice (e-Fatura or e-Arşiv): the seller’s VKN and tax office should match the certificate.

* Bank account holder: the holder of the IBAN you have been given should be the same person or entity named on the certificate. For a sole proprietorship, an account in the owner’s name can be normal; an account in a third party’s name is not.

* Email domain and website: the business name and contact details should fit sensibly with the name and address on the certificate.

Small differences in the name matter. “… Tekstil San. ve Tic. Ltd. Şti.” and “… Tekstil İth. İhr. Ltd. Şti.” may be two entirely separate companies. We explain how to check the start date and address against gazette announcements in our guide on how to read the Turkish Trade Registry Gazette.

Red flags on a Turkish tax certificateNone of the following proves fraud on its own, but each is a good enough reason to ask for an explanation before you pay.

An old certificateA certificate from several years ago does not show that the business is still active today. Old certificates of businesses that have ceased trading or gone into liquidation can keep circulating online and in old correspondence. If a supplier is reluctant to send a current certificate, or only ever shares an old one, ask why.

An activity code that does not match the claimed manufacturingA business that presents itself as a manufacturer may have a main activity code for wholesale trade, brokerage or an entirely different sector. That is not always a problem: some firms register their main activity differently, and some subcontract production. But if a supplier says “we produce in our own factory” and its certificate shows an unrelated activity such as software or consultancy, it is time to ask where, and by whom, the goods are actually made.

A sole proprietorship posing as a factoryIf a supplier with a polished website, claims of large production capacity and export experience has a certificate showing an 11-digit national ID number and an individual’s name, it is a sole proprietorship. That can be a perfectly legitimate structure, but you should consider whether it fits the scale being described, and pay particular attention to whose name the bank account is in.

A tax number belonging to a different companyFraudsters often copy the tax number of a real, active company onto their own documents. If the name shown on the verification screen differs from the name of the business you are dealing with, the number belongs to someone else. Stop the payment process and contact the real company using contact details you have found independently.

An edited PDFMixed fonts, misaligned lines, blurred or overwritten sections, a QR code that does not scan or points to an unofficial page, and a missing approval code can all suggest that a document has been altered. A visual check is not enough on its own; the real test is whether the approval code returns the same details in the official system. For warning signs beyond the tax certificate, see our guide to the 10 red flags of a fake Turkish supplier.

What a tax certificate proves, and what it does notA verified vergi levhası shows that the named business is registered as a taxpayer under the stated tax number at the stated tax office. That is valuable, but for payment security it has clear limits. A tax certificate does not prove:

* Production capacity: it does not show that the business can make your order to the required quality and timetable.

* Your contact’s authority: it does not prove that the person emailing you works for the company or is entitled to bind it. That requires the signature circular (imza sirküleri) and registry records.

* Bank account ownership: it does not show that the IBAN on the pro-forma invoice belongs to the company.

* An operating business at the address: the address may have been notified to the tax office, but that does not mean a production site exists there.

* Product quality or delivery reliability.

In one of the most common fraud patterns the certificate is entirely genuine, because the fraudster is using the documents of a real, active company. Verification succeeds and everything looks in order, yet the payment goes to an account with no connection to that company. Checking the tax certificate is an important first step, not the last one.

Going beyond the certificate: verification with EnterTurkeyEnterTurkey, based in Ankara, verifies Turkish suppliers for foreign buyers before payment. The EnterTurkey Lite check confirms the company’s identity and registration status, the authority of the representative you are dealing with, and whether the bank account holder matches the company. Results are delivered within 24 hours (1 working day), and the fee is $199.

If you need a deeper review, the Pro package ($499) adds research in official sources and an exterior check of the registered address, with delivery within 48 hours (2 working days). To see what a report covers, take a look at our sample report.

Summary: Turkish tax certificate checklist* Ask the supplier for a current, electronically generated vergi levhası as the original PDF.

* Note the name, VKN or national ID number, tax office, activity code and start date.

* Verify the approval code by going to GİB’s official gov.tr site yourself; never use a link sent by the supplier.

* Compare the certificate with the MERSİS record, the Trade Registry Gazette, the pro-forma invoice and the invoice.

* Make sure the IBAN account holder is the same as the name on the certificate.

* Question red flags such as an old date, a mismatched activity code, a sole proprietorship presented as a factory or a tax number belonging to another company.

* Remember that the certificate does not prove capacity, your contact’s authority or bank account ownership; have the supplier independently verified before you pay.

Frequently asked questionsWhat is a Turkish tax certificate (vergi levhası)?It is a certificate showing that a business is registered as a taxpayer with the Turkish Revenue Administration (GİB). It typically shows the legal name, tax number, tax office, tax type, main activity code, start date and declared figures for recent years. Most certificates are now generated electronically and carry an approval code that allows them to be checked.

Is vergi levhası verification free?According to GİB, tax number and tax certificate queries and verification are free through e-Devlet and official electronic services such as the Digital Tax Office, the Internet Tax Office and the Interactive Tax Office. Be wary of official-looking third-party sites that charge for these checks.

Can I verify a Turkish company tax ID from abroad?Possibly, but it is not always easy. Some GİB verification screens may work without logging in, while others may require e-Devlet or GİB credentials that foreign buyers do not usually have. The interfaces are largely in Turkish. If you cannot complete the check yourself, a local verification service can do it for you.

What is the difference between a VKN and a T.C. kimlik number on a tax certificate?Companies such as an A.Ş. or Ltd. Şti. are registered under a 10-digit tax identification number (VKN). Sole proprietors generally use the owner’s 11-digit national identity number (T.C. kimlik numarası) as their tax number. An 11-digit number on the certificate of a supplier claiming to be a large company deserves a question.

If the tax certificate is genuine, is it safe to pay the supplier?Not on its own. A verified certificate proves tax registration, but it does not prove that your contact is authorised to act for the company, that the IBAN you were given belongs to it, or that it can produce your order. Fraudsters often use the genuine certificate of a real company.

How can EnterTurkey help me check a Turkish supplier?The EnterTurkey Lite check confirms company identity, registration status, the representative’s authority and the bank account holder within 24 hours (1 working day) for $199. The Pro package ($499) adds official-source research and an exterior check of the registered address, delivered within 48 hours (2 working days).