A tax number is the essential ID number for each registration and financial transaction in Turkey. A Tax Identification Number is a ten-digit number assigned to individuals.
Foreigners should have a tax number for; opening a bank account, buying a property, subscribing for utility services, issuing insurance, getting health services, doing notarial processes, applying for residence permits, etc.
You can click on the above Link and You need to fill all the details on the website and You will get your Tax Id number same time details mentioned are mainly your Passport details. in case you are facing any error you need to visit local tax office in your area. The only documents you need for this transaction are “your original passport” and “copy of your passport”. Registration is free of charge. After registration, your tax number is also monitored at the screens of all Turkish financial institutions including banks, which means you will be able to open a bank account, too.
You can visit any Tax Office (Vergi Dairesi) in your area to be able to obtain the Tax Number.
This transaction usually takes around fifteen minutes. After you receive your tax ID number, you can open your bank account and carry out your official transactions.