Does tax count as zakat?

Tax is a civic duty, whereas zakat is a religious obligation. Moreover, zakat and tax differ from each other in terms of liability, main purpose, rate, amount, and areas of expenditure (at-Tawba, 9/6). Therefore, taxes paid to the state do not substitute for zakat. Zakat must be given separately. (Karadawi, Fiqh az-Zakat, 2/1118; Contemporary Issues in Islamic Commercial Law, 996)

Source: T.C. Diyanet İşleri Başkanlığı, Din İşleri Yüksek Kurulu