We all love Turkey for such many kinds of attraction. And the Turkey government love tourists more stating with 2020 as new tax will be added for tourists.
The new tax per day will be for tourist 12+ years old.
For a 5 star hotel the tax will me ~$3.12 per person per night. For a 4 stars hotel you will pay about $2 per person per night.
Not so much, but let’s take a couple with two child of 13 and 15 years old for 10 overnights at a 5 star hotel. This will be $3.12 x 4 pax x 10 nights = $124.80 on the top of your actual costs.
Anyway, as Turkey is not such of costly destination and has good quality services, the increase of the costs it will not be such a problem.