# Turkey VAT number check: verify a Turkish company's tax ID

URL: https://fincodelabs.com/en/blog/turkey-vat-number-check · Publisher: Fincode (Fincode Yazılım ve Teknoloji A.Ş.), Istanbul, Turkey · Category: Business in Turkey · Published: 2026-11-06 · Updated: 2026-11-06

Turkey VAT number check: the 10-digit tax ID, why VIES fails, what GİB shows with and without a login, and how to find a company in the trade register.

**Short answer:** A **Turkey VAT number check** is a check of the company's 10-digit tax ID (*vergi kimlik numarası*), because Turkey issues no separate VAT number and VIES does not cover it. As read on 5 November 2026, the full verification by the Revenue Administration (GİB), showing name, tax office and activity status, sits behind a Digital Tax Office login, so a foreign team without an account combines the open e-invoice user search, a taxpayer letter from the supplier and the trade registry. A valid number does not prove good standing or sanctions status.

This question usually arrives when an EU tool rejects a Turkish number or a vendor form demands a VAT ID. Pages that rank for it tend to stop at a format rule or a link to GİB's home page, and some point to a lookup that no longer opens the way they describe.

This guide records what each official page did on 5 November 2026 and says what was not tested: forms with a security code were read, not submitted or automated. Getting a number is covered in [Turkish tax number for foreigners](https://fincodelabs.com/en/blog/turkish-tax-number-for-foreigners), rates and invoices in [Turkey VAT rate](https://fincodelabs.com/en/blog/turkey-vat-rate-and-refund) and the [VAT calculator](https://fincodelabs.com/en/tools/turkey-vat-calculator), and registration in [company formation in Turkey](https://fincodelabs.com/en/blog/company-formation-in-turkey). This is not tax advice.

## Turkey VAT number format and validation

A Turkish company's VAT number is its 10-digit tax ID; the same number appears on invoices and returns, and a format pass only shows that it was typed correctly.

- **Companies:** 10 digits. GİB's verification form accepts digits only, with no country prefix, so strip any TR that a foreign system adds.
- **Individuals:** Turkish citizens use their 11-digit identity number; a foreigner uses an 11-digit foreign identity number starting with 9 or, without one, a 10-digit tax number from GİB. These identify people, so do not run them through checks without a lawful basis.
- **Check digit:** format validators compute the tenth digit from the first nine, so exactly one in ten random 10-digit strings passes. A pass catches typing errors and proves nothing about registration.

## Why VIES cannot validate a Turkish VAT number

VIES covers EU member states and Northern Ireland only, and Turkey is not in it: the European Commission's [VIES status feed](https://ec.europa.eu/taxation_customs/vies/rest-api/check-status) read on 5 November 2026 listed 28 codes, the 27 member states plus XI for Northern Ireland, and no TR.

A failed VIES lookup therefore says nothing about a Turkish supplier. Your own VAT rules decide what evidence you need for a supplier outside the EU, so ask your adviser. If a third-party checker reports a Turkish number as valid, ask whether it ran a format test or an official query, since a format test proves little.

## Turkey VAT number check online: what GİB offers today

GİB's direct tax number verification needs a Digital Tax Office login, while the no-login routes confirm e-invoice registration or documents the supplier hands you.

**GİB routes as found on 5 November 2026 (forms read, none submitted)**

| Route | What it asks for | What it confirms | Limit |
| --- | --- | --- | --- |
| [Tax number verification](https://dijital.gib.gov.tr/portal/vkndogrulama) (*Vergi Kimlik Numarası Doğrulama*) | Login, then tax ID, province and tax office | Name or title, tax office and activity status, per the result labels in the portal's public script | It sits inside the logged-in portal and is missing from the home page's no-login list, so most foreign teams need a Turkish accountant to run it |
| [e-Invoice registered users](https://ebelge.gib.gov.tr/efaturakayitlikullanicilar.html) | Tax ID and security code, no login | Registration in e-Fatura; the page showed 2,217,379 users with an update date of 5 November 2026 | A missing entry proves little, because only some taxpayers must join, depending on sales and sector; see the [e-invoice guide](https://fincodelabs.com/en/blog/turkey-e-invoice) |
| [Taxpayer or debt status letter](https://dijital.gib.gov.tr/dogrulamalar/mukellefiyetDogrulama) (*mükellefiyet*, *borç durum yazısı*) | Tax ID, the letter's petition number and security code, no login | That the letter is genuine | The supplier must first give you the letter |
| [Beneficial ownership document](https://dijital.gib.gov.tr/dogrulamalar/gercekFaydalaniciBelgeDogrulama) | Tax ID, verification code and security code, no login | That the document is genuine | Only if the supplier shares it |
| [Tax office document check](https://dijital.gib.gov.tr/dogrulamalar/ivdBelgeDogrulama) | Tax ID, document type, transaction number and security code, no login | Three document types: pharmacy information form; balance sheet, income or business account summary; sales revenue information form | Useful for financials, not identity |
| e-Tax plate (*vergi levhası*) | The supplier downloads it from its account | Tax office and tax type, with an approval code; the portal's script lists Turkish and English versions | The plate query and check are also inside the logged-in portal |

The older [Interactive Tax Office](https://ivd.gib.gov.tr/) is why many pages mislead. Its no-password session redirected to dijital.gib.gov.tr on 5 November 2026, while GİB's [June 2019 user guide](https://ivd.gib.gov.tr/kilavuz.pdf), still online, describes checks of a tax ID by province and tax office, of the e-tax plate and of ex officio closures. In the new portal's script those three checks are logged-in functions.

The no-login forms above carry a security code and the rest need a login, so do not script them or bulk-harvest records. Treat each check as a manual step when you onboard a supplier.

## Turkey company register search: what is free

The trade registry is public by law, but the free online routes are limited to a name search, member-only notices and chamber searches.

[Commercial Code No. 6102](https://www.mevzuat.gov.tr/mevzuatmetin/1.5.6102.pdf), Article 35, lets anyone inspect a registry's contents and buy certified copies, including a certified statement of whether a fact is registered, and [Trade Registry Regulation](https://mevzuat.gov.tr/MevzuatMetin/21.5.20124093.pdf) Article 15 allows inspection electronically or at the office.

**How to find a company in the Turkish trade register, read 5 November 2026**

| Source | What it offers | Needs |
| --- | --- | --- |
| [Trade name search](https://www.ticaretsicil.gov.tr/view/hizlierisim/unvansorgulama.php) ([Trade Registry Gazette](https://www.ticaretsicil.gov.tr/), run by TOBB) | Search by name | Name and security code |
| Gazette notices | Notices since 1957, with paid certified copies | Member login or e-Devlet; the sign-up form offers person and company accounts and says a registry number is optional; not tried from abroad |
| [MERSİS](https://mersis.ticaret.gov.tr/) (Ministry of Trade) | No open company search on the home page. The [Ministry's FAQ](https://ticaret.gov.tr/ic-ticaret/sikca-sorulan-sorular/ticaret-sicili) says logged-in members get basic company details under Sorgular, Firma Sorgu | Membership, with personal details checked against population records; not tested from abroad |
| [İTO company search](https://bilgibankasi.ito.org.tr/tr/bilgi-bankasi/firma-bilgileri) (Istanbul only) | Search by trade registry, chamber or MERSİS number, trade name or NACE code | A reCAPTCHA check, per the page's script; not submitted |
| [Registry offices](https://www.ticaretsicil.gov.tr/view/menu/mudurlukler.php) | Certified copies from the office where the company is registered | Fees and charges (Regulation Article 17); a lawyer or accountant in Turkey can request them |

## What a MERSİS number tells you

A MERSİS number is a 16-digit company ID built using the tax number for legal entities, so it gives you a consistency test rather than separate proof.

The [Ministry of Trade's FAQ](https://ticaret.gov.tr/ic-ticaret/sikca-sorulan-sorular/ticaret-sicili) says the number is 16 digits and is generated from the tax number for legal entities and from the identity number for individuals. The [Trade Registry Regulation](https://mevzuat.gov.tr/MevzuatMetin/21.5.20124093.pdf) calls it a unique number produced by a special algorithm (Article 4), fixed once given, with a branch's number built from the head office number plus a sequence number (Article 13), and it replaces the older registry number once a registry uses MERSİS (Article 19). Neither text publishes the digit layout, so treat a mismatch as a question for the supplier, not as proof of fraud.

## Turkey VAT number example: Fincode's public numbers

Fincode's own numbers make a safe worked example because they are already published, but Fincode, which publishes this guide, is itself a Turkish software company, so it is not neutral here: run the checks yourself.

> **Numbers from the [company information page](https://fincodelabs.com/en/company-information):** tax office Mecidiyeköy, tax ID 3882015834, MERSİS 0388201583400001, Istanbul trade registry no. 1165253.
>
> 1. **Format.** Ten digits, and the check digit passes when calculated. That shows only a correct typing.
> 2. **MERSİS consistency.** Sixteen digits; digits 2 to 11 are 3882015834, the tax ID, followed by 00001. This fits the Ministry's statement, but one number does not establish a layout.
> 3. **Tax.** Enter the tax ID and security code in the e-invoice search, and ask for a taxpayer letter to verify by petition number.
> 4. **Registry.** Search the legal name in the Gazette's name search and 1165253 in the İTO search's Ticaret Sicil No field.
>
> Steps 3 and 4 are checks for you to run; their results are not reported here. The same details appear on the [partner page](https://fincodelabs.com/en/fintech-software-partner-turkey).

## A three-level check, and what a pass does not prove

Run format, tax and entity checks in that order, and treat each pass as narrowing the risk rather than clearing the supplier.

**What to keep on file for a Turkish supplier**

| Level | Evidence | What it stops | What it does not prove |
| --- | --- | --- | --- |
| 1. Format | Check-digit pass | Typing errors | That the number exists |
| 2. Tax | Dated e-invoice hit or verified taxpayer letter; e-tax plate | Invented numbers, name mismatch | Tax payments, unless a debt status letter says so |
| 3. Entity | Registry certificate, Gazette notice, signature circular | Wrong entity, unauthorized signatory | Solvency, current shareholders, sanctions status |

- **Who can sign.** Unless the articles say otherwise or the board has one member, a joint-stock company's board signs with two signatures (Commercial Code Article 370(1)), but it may delegate signing to managing members or managers (Article 370(2)) and files who signs and how for registration (Article 373(1)). Check the registry notice and signature circular; see [software development company in Turkey](https://fincodelabs.com/en/blog/software-development-company-turkey) for how to read them.
- **Bank details.** Pay only to an account in the registered trade name. Turkish banks must record a tax number when they open an account, as [bank account in Turkey](https://fincodelabs.com/en/blog/bank-account-in-turkey-for-foreigners) explains.
- **Ex officio closure.** The Digital Tax Office has a query for taxpayers closed by the tax office (*re'sen terk*), inside the logged-in portal, which a Turkish accountant can run.
- **Licensed finance firms.** If a partner says it is a bank or a payment or electronic money institution, find it on the [institution list](https://www.bddk.org.tr/Kurulus/Liste/77) of the Banking Regulation and Supervision Agency (BDDK) or the Central Bank of the Republic of Türkiye (TCMB) lists of [payment institutions](https://www.tcmb.gov.tr/wps/wcm/connect/TR/TCMB+TR/Main+Menu/Temel+Faaliyetler/Odeme+Hizmetleri/Odeme+Kuruluslari) and [electronic money institutions](https://www.tcmb.gov.tr/wps/wcm/connect/TR/TCMB+TR/Main+Menu/Temel+Faaliyetler/Odeme+Hizmetleri/Elektronik+Para+Kuruluslari), all read 5 November 2026. A listing shows a license, not solvency or conduct.
- **Sanctions.** Screen names under your own program. None of these routes does that for you.

## Frequently asked questions

### Does Turkey have a VAT number?

Not a separate one. A company's 10-digit tax ID (vergi kimlik numarası) serves as its VAT number on invoices and returns.

### Can I check a Turkish VAT number in VIES?

No. The Commission's VIES status feed read on 5 November 2026 listed the 27 member states and Northern Ireland, and not Turkey.

### Is there a free Turkey VAT number check online?

Partly. GİB's e-invoice user search and its taxpayer letter check need no login, but only confirm e-invoice registration or a document you already hold. The direct verification showing name and activity status needs a Digital Tax Office login.

### Can I automate a Turkish tax ID check?

A format check, yes. GİB's forms carry a security code, so do not script them or harvest records. Keep the official step manual, or have a Turkish accountant run it.

### How do I find a company in the Turkish trade register?

Start with the Trade Registry Gazette's name search. For Istanbul companies, the İTO search takes a registry number or trade name. Ask the supplier for a registry certificate, and use a lawyer or accountant in Turkey for certified copies.

### Does a valid tax number mean a Turkish company is in good standing?

No. It shows that the number was assigned. Tax debts, solvency, ownership and sanctions status need separate checks.

## Sources

- [GİB Digital Tax Office: home page and list of verifications (Turkish)](https://dijital.gib.gov.tr/)
- [GİB Digital Tax Office: tax number verification, a logged-in portal function (Turkish)](https://dijital.gib.gov.tr/portal/vkndogrulama)
- [GİB: e-Fatura registered users search (Turkish)](https://ebelge.gib.gov.tr/efaturakayitlikullanicilar.html)
- [GİB: taxpayer and debt status letter verification (Turkish)](https://dijital.gib.gov.tr/dogrulamalar/mukellefiyetDogrulama)
- [GİB: Digital and Interactive Tax Office document verification (Turkish)](https://dijital.gib.gov.tr/dogrulamalar/ivdBelgeDogrulama)
- [GİB: Interactive Tax Office user guide, June 2019, sections 4.3 to 4.7 (Turkish)](https://ivd.gib.gov.tr/kilavuz.pdf)
- [European Commission: VIES status feed, country codes, read 5 November 2026](https://ec.europa.eu/taxation_customs/vies/rest-api/check-status)
- [Ministry of Trade: Trade registry FAQ, MERSİS number and company query (Turkish)](https://ticaret.gov.tr/ic-ticaret/sikca-sorulan-sorular/ticaret-sicili)
- [Mevzuat: Trade Registry Regulation, Articles 4, 13, 15 to 17 and 19 (Turkish)](https://mevzuat.gov.tr/MevzuatMetin/21.5.20124093.pdf)
- [Mevzuat: Turkish Commercial Code No. 6102, Articles 35, 370 and 373 (Turkish)](https://www.mevzuat.gov.tr/mevzuatmetin/1.5.6102.pdf)
- [Türkiye Ticaret Sicili Gazetesi (Trade Registry Gazette, TOBB) (Turkish)](https://www.ticaretsicil.gov.tr/)
- [Istanbul Chamber of Commerce: company search (Turkish)](https://bilgibankasi.ito.org.tr/tr/bilgi-bankasi/firma-bilgileri)
- [TCMB: licensed payment institutions (Turkish)](https://www.tcmb.gov.tr/wps/wcm/connect/TR/TCMB+TR/Main+Menu/Temel+Faaliyetler/Odeme+Hizmetleri/Odeme+Kuruluslari)
- [TCMB: licensed electronic money institutions (Turkish)](https://www.tcmb.gov.tr/wps/wcm/connect/TR/TCMB+TR/Main+Menu/Temel+Faaliyetler/Odeme+Hizmetleri/Elektronik+Para+Kuruluslari)
- [BDDK: list of banks and other supervised institutions (Turkish)](https://www.bddk.org.tr/Kurulus/Liste/77)

> This guide is general information, not legal or tax advice. Rules and official registers change: check the date given for each fact and the official source before you rely on it, and ask a licensed adviser about your own situation. Sources, checks and corrections: see the [editorial policy](https://fincodelabs.com/en/editorial-policy).

---

Published by Fincode (Fincode Yazılım ve Teknoloji A.Ş.), a software company in Istanbul, Turkey: https://fincodelabs.com/en/blog/turkey-vat-number-check

Cite as: Fincode, "Turkey VAT number check: verify a Turkish company's tax ID", updated November 6, 2026, https://fincodelabs.com/en/blog/turkey-vat-number-check