To aid the welfare of Muslim society, Islam orders those who have excess wealth to pay 20% of it to charity.
Al- Khums is divided into two parts:
- Half to the current Imam (Sahm al-Imam)
- Half for the poor descendants of the Prophet (Sahm al-Sada)
If a Muslim has wealth in the form of possessions or income, that is not in use or needed for a year, then that wealth is deemed excess to their needs and 20% of it should be paid to the above on an annual basis.