Resumen
Taxation according to the ability to pay is one of the basic constitutional principles of tax law. With the provision in Turkey Constitution paragraph 1 of Article 73 "Everyone, to meet the public expenditure according to his financial power, is obliged to pay taxes." the ability to pay is defined as a constitutional principle of taxation. The study will be composed of; comparison of concepts of ability to pay and economic ? fiscal power, inspection of the principle of ability to pay and techniques to realize the ability to pay principle in the Turkish tax system.