If you are on a Tourist visa in Turkey you should not work at all, because in that case you will be deported from Turkey and a year restriction will be placed on your visa. That means you cannot enter this country for a year. This duration can be extended if you do not pay the fine which will be issued after the deportation.

If you have a residency and if you get caught while you are working without a work permit, you will not deported strait away. You will be fined but you are not going to deported but you may have problems for getting a new residency therefore please get a work permit if you would like to work in Turkey.