How to Verify a Company Name from TAN Number in Turkey

When you’re evaluating a business in Turkey, checking its Tax Identification Number (TAN) is one of the fastest ways to confirm its legitimacy and avoid costly mistakes. Whether you’re a supplier, investor, or customer, verifying a company name from its TAN number helps you confirm registration status, tax compliance, and legal standing—without digging through stacks of paperwork. Here’s how to do it quickly and what to watch for.

Why the TAN Number Matters Before You Partner

A TAN number isn’t just a tax ID—it’s the official identifier the Turkish Revenue Administration (GİB) uses to track a company’s tax obligations, filings, and legal existence. If a supplier claims to be registered but can’t provide a valid TAN, that’s a red flag. For example, a construction firm in Istanbul might claim to operate legally, but a quick TAN lookup could reveal it’s been inactive for two years or has unpaid taxes. Always cross-check the name on invoices, contracts, and official documents against the TAN record to ensure consistency.

Where to Look Up a Company Name from Its TAN

Turkey’s tax authority doesn’t offer a public TAN lookup tool, but you can verify details through indirect channels. The MERSİS system (Central Registry System) is the most reliable source. Here’s how:

• MERSİS Search: Visit the MERSİS portal and enter the TAN number. The system will display the registered company name, address, and legal status. This is free and updated daily.
• Trade Registry Gazette: For larger companies, check the Official Gazette for recent changes in company status, capital, or ownership. This is useful if you’re vetting a potential joint venture partner.
• Local Chamber of Commerce: Some chambers provide TAN verification for a small fee, especially for high-value transactions. This is common in export-heavy regions like Bursa or Kocaeli.

What to Do If the Name Doesn’t Match

Discrepancies between the TAN record and a company’s claims are common in fraud cases. For instance, a textile exporter in Denizli might list a different name on its website than the one registered with the tax authority. If you spot a mismatch:

• Request a tax certificate: Ask the company to provide a vergi levhası (tax certificate), which includes the official TAN and registered name. Compare it to their business card or website.
• Check the trade registry: Use the company’s TAN to pull its full trade registry entry. Look for recent changes in management or capital that could signal instability.
• Contact the tax office: If you suspect fraud, you can file a complaint with the local tax office. Provide the TAN and any evidence of misrepresentation.

Red Flags in TAN Records You Can’t Ignore

Not all mismatches are intentional—some are administrative errors. But certain patterns should raise alarms:

• Recent name changes: If a company’s TAN record shows a name change within the last 6 months, verify why. Rapid rebranding can hide financial troubles.
• Inactive status: A TAN marked as “inactive” or “suspended” means the company isn’t filing taxes. Avoid entering long-term contracts with such firms.
• Address discrepancies: If the TAN’s registered address doesn’t match the one on invoices or Google Maps, the company might be operating from an unregistered location.

Actionable Next Steps for Buyers and Investors

Verifying a company name from its TAN isn’t a one-time check—it’s part of due diligence. Here’s a simple workflow to follow:

1. Start with MERSİS: Confirm the company name and legal status using the TAN. Save a screenshot or PDF for your records.
2. Cross-reference with invoices: Ensure the name on the TAN matches the one on recent invoices. If not, ask for an explanation.
3. Review trade registry filings: Look for changes in capital, shareholders, or legal representatives. Sudden drops in capital can signal financial distress.
4. Monitor ongoing compliance: Set a reminder to recheck the TAN status every 6–12 months, especially for long-term suppliers.

Taking 10 minutes to verify a TAN can save you from partnering with a shell company or a financially unstable firm. In Turkey’s fast-moving markets, where names and addresses change frequently, this small step is a powerful tool for risk management. Always pair TAN checks with other due diligence—like visiting the company’s office or checking references—but never skip the TAN verification. It’s the fastest way to separate legitimate businesses from the rest.