We got our tax numbers (while we waited) from the tax office in Fethiye whilst on holiday last June (need original passport and a photocopy) Opened Garanti bank account on arrival in October, a month before we had a permanent address and 10 weeks before we got residency. So you don't need residency to open a bank account, just a tax number so they can pay 15℅ tax on interest earned. I'm surprised more 'tourists' don't save here !!