Extra Car Rental Fees in Turkey

The daily rental fee and Collision Damage Waiver (CDW) are the costs we look most closely at, but other fees and taxes can increase the cost of car rental substantially. Keep these in mind:

Additional Insurance
Besides CDW there's PAI, LFC and Theft.

Additional Driver
You may have to pay a fee of around TL6 for an additional driver to be listed on the insurance documents.

Child Safety Seat
The larger rental companies should have these available at an additional fee (perhaps as much as TL15 per day. Reserve yours in advance just to be sure.

Delivery Fee
If you do not pick up your car from a company office (or within the immediate area, such as at a hotel in the town or city), you may have to pay a delivery fee of around TL0.60 per kilometer (TL0.70 per mile) for the distance from the company office to the point of pick-up. This can add up to a substantial charge.

Transfer/Return Fee
If you do not return the car to the company office from which you rented it, you may have to pay a transfer/return fee (often around TL100) for someone to come to where you are and drive the car back to the originating office.

The most expensive car rental companies may not ask for a transfer/return fee, but it may still end up being cheaper to rent the car from a smaller company at a lower rate and to pay the transfer fee. Do the math!

Also, consider the cost of fuel when deciding whether to rent- here, return-there. It may actually be cheaper to pay the transfer/return fee rather than to drive the car back yourself when you consider the cost of fuel, and rental and insurance charges for the time it takes you to drive the car back.

Source : http://www.turkeytravelplanner.com/trans/Car/car_rental/extra_fees.html