Nizari Ismā'īlīs donate 10% to 12.5% of their monthly net income (after taxes, basic living necessities and debt repayment) to the Imām, an amount which includes zakat and khums. Part of this money is typically paid to organizations run by the Aga Khan Development Network, one of the biggest welfare networks in the world.
Thus, Ismā'īlīs believe that as Muhammad was designated to take zakāt from the believers in the past, it is now the duty to pay the imām or his representative. The Druze practice hifzu l-'Ikhwān "protection of one's brothers", instead of paying a fee, involves a culturally complex practice of interdependence.