If you are planning to live or retire to Turkey you will need to organise the following:
Foreign Identity Number (Yabanci Kimlik Number) and Turkish Tax Number. If you are planning to purchase a Turkish property, pay utility bills, rent a property long term, open a bank account, take a Turkish driving license or reside in Turkey over 90 days, a Turkish Tax number and Foreign ID number is vital. The tax number is issued at the local tax office (Vergi Dairesi), the Yabanci Kimlik number from the nearest city foreign police department.
Residence Permit. Foreigners looking to stay for extended periods of time in Turkey, more than the 90 days in 180 days holiday e-visa allowance, will need to obtain a residence permit. It is possible to get a residence permit for 1 or 2 years (short term), a long term residence permit (permanent) may also be available to some that have officially resided in Turkey for over 8 years. Applying for a residence permit can by time consuming and a number of documents are required. It’s a good idea to either employ a local runner specialising in applications, or take a fluent Turkish speaker with you if your language skills are not up to scratch. Please see question on ‘how to apply for a residence permit’ for more details.