The third pillar of Islamic practice is the mandatory tax known as zakat, which means to purify, grow, or foster. The intention is that people and their possessions will be purified and perhaps even multiplied through the generosity of giving.
The Quran speaks of zakat in chapter 2, verse 177 and defines righteousness partly through the giving of wealth to “relatives, orphans, the needy, the traveler, those who ask for help, and for freeing slaves…” In 9:103, Muhammad was encouraged to take from the wealth of the Muslim community in order to “… purify them and cause them increase, and invoke Allah’s blessings upon them.”
Volume upon volume of Islamic law (sharia) has been written addressing the nuances of zakat. But in essence, every Muslim is required to inventory their wealth each year – property, cash, savings, gold, silver – and contribute 2.5% of this total to benefit those less fortunate.
In some countries, for example, a person’s wealth is measured in land or livestock, so there are formulas for zakat based on how much land or how many sheep, cattle, or camels one owns. People are exempt from zakat if their assets are less than the value of 85 grams of gold. Zakat is distinct from sadaq, which is voluntary charity – giving above and beyond what is required.