kharaj

Tax imposed on recent Islamic converts in the 7th–8th century. In Islamic territories, Jews, Christians, and Zoroastrians who did not convert to Islam were required to pay a tax called the jizya. Many people converted to Islam to avoid this tax or to escape the ban on non-Muslims owning land. As financial problems mounted for the Umayyad rulers, authorities imposed the kharaj as a property tax for recent converts. Popular opposition to the tax led to a revolt in 747 and precipitated the downfall of the Umayyad dynasty.